MCQ Questions

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 5 Magnetism and Matter with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers are prepared as per the Latest Exam Pattern. Students can solve these Magnetism and Matter Class 12 MCQs Questions with Answers and assess their preparation level.

Magnetism and Matter Class 12 MCQs Questions with Answers

Solving the Magnetism and Matter Multiple Choice Questions of Class 12 Physics Chapter 5 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Magnetism and Matter Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 5 Physics Class 12 and cross-check your answers during preparation.

I. Choose the correct answer

Question 1.
In a permanent magnet at room temperature
(a) magnetic moment of each molecule is zero.
(b) the individual molecules have non¬zero magnetic moment which are all perfectly aligned.
(c) domains are partially aligned.
(d) domains are all perfectly aligned.

Answer

Answer: (c) domains are partially aligned.

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Question 2.
Two magnets of equal mass are joined at right angles to each other as shown that magnet 1 has a magnetic moment 3 times that of magnet 2. This arrangement is pivoted so that it is free to rotate in the horizontal plane. In equilibrium what angle will the magnet 1 subtend with the magnetic meridian?

(a) tan^-1 (\(\frac { 1 }{2}\))
(b) tan^-1 (\(\frac { 1 }{3}\))
(c) tan^-1(1)
(d) 0°

Answer

Answer: (b) tan^-1 (\(\frac { 1 }{3}\))

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Question 3.
The ratio of the area of B-H curve and l-H curve of a substance in M.K.S. system is
(a) µ\(_{0}^{2}\)
(b) \(\frac { 1 }{µ_0^2}\)
(c) µ₀
(d) \(\frac { 1 }{µ_0}\)

Answer

Answer: (c) µ₀

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Question 4.
The magnetic susceptibility is negative for:
(a) diamagnetic material only
(b) paramagnetic material only
(c) ferromagnetic material only
(d) paramagnetic and ferromagnetic materials

Answer

Answer: (a) diamagnetic material only

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Question 5.
Hysteresis loops for two magnetic materials A and B are given below. These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use:

(a) A for electric generators and transformers.
(b) A for electromagnets and B for electric generators
(c) A for transformers and B for electric generators
(d) B for electromagnets and transformers

Answer

Answer: (d) B for electromagnets and transformers

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Question 6.
An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be
(a) M
(b) \(\frac { 2M }{π}\)
(c) \(\frac { M }{π}\)
(d) Mπ

Answer

Answer: (b) \(\frac { 2M }{π}\)

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II. Fill in the blanks

Question 1.
The magnetic field strength at a point due to a short bar magnet on its axis varies ………………… as cube of distance of the point from the centre of magnet.

Answer

Answer: Inversely

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Question 2.
……………….. is a vertical plane passing through the magnetic North and South Poles of the earth.

Answer

Answer: Magnetic meridian

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Question 3.
………………. is a vertical plane passing through the geographic North and South Poles.

Answer

Answer: Geographic meridian

---

Question 4.
………………. at a place is defined as the acute angle between the magnetic meridian and the geographic meridian.

Answer

Answer: Declination

---

Question 5.
Lines drawn up on a magnetic map through places that have the same declination are called ……………… lines.

Answer

Answer: Isogonic

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Question 6.
……………. at a place is defined as the angle between the direction of total intensity of the earth’s magnetic field and a horizontal line in the magnetic meridian at that place.

Answer

Answer: Dip

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Question 7.
Lines drawn up on a magnetic map through places, which have the same dip, are called ………………. lines.

Answer

Answer: Isoclinic

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Question 8.
The degree to which the magnetic field can penetrate or permeate a medium is called its magnetic ………………

Answer

Answer: Permeability

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Question 9.
For paramagnetic materials, magnetic susceptibility is related with temperature as inversely proportional to ………………..

Answer

Answer: Temperature

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Question 10.
There is no effect of temperature on ……………… type of materials.

Answer

Answer: Diamagnetic

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Question 11.
The ability of a material to retain magnetism after removal of magnetising field is called ………………

Answer

Answer: Retentivity

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Question 12.
The measure of the magnetic intensity required to destroy the residual magnetism of the specimen is called ……………..

Answer

Answer: Coercivity

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Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 5 Magnetism and Matter with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Physics Magnetism and Matter MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers are prepared as per the Latest Exam Pattern. Students can solve these Electromagnetic Induction Class 12 MCQs Questions with Answers and assess their preparation level.

Electromagnetic Induction Class 12 MCQs Questions with Answers

Solving the Electromagnetic Induction Multiple Choice Questions of Class 12 Physics Chapter 6 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Electromagnetic Induction Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 6 Physics Class 12 and cross-check your answers during preparation.

I. Choose the correct answer

Question 1.
A cylindrical bar magnet is rotated about its axis (figure). A wire is connected from the axis and is made to touch the cylindrical surface through a contact. Then

(a) a direct current flows in the ammeter A.
(b) no current flows through the ammeter A.
(c) an alternating sinusoidal current flows through the ammeter A with a time period T = 2π/ω.
(d) a time varying non-sinusoidal current flows through the ammeter A.

Answer

Answer: (a) a direct current flows in the ammeter A.

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Question 2.
There are two coils A and B as shown in figure. A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving. The current in A is counterclockwise. B is kept stationary when A moves. We can infer that

(a) there is a constant current in the clockwise direction in A.
(b) there is a varying current in A.
(c) there is no current in A.
(d) there is a constant current in the counterclockwise direction in A.

Answer

Answer: (d) there is a constant current in the counterclockwise direction in A.

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Question 3.
The self-inductance L of a solenoid of length l and area of cross-section A, with a fixed number of turns N increases as
(a) l and A increase.
(b) l decreases and A increases.
(c) l increases and A decreases.
(d) both l and A decrease.

Answer

Answer: (b) l decreases and A increases.

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Question 4.
A metal plate is getting heated. Which one of the following is not the possible cause?
(a) a direct current is passing through the plate.
(b) it is placed in a time-varying magnetic field.
(c) it is placed in a space-varying magnetic field, but does not vary with time.
(d) a current (either direct or alternating) is passing through the plate.

Answer

Answer: (c) it is placed in a space-varying magnetic field, but does not vary with time.

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Question 5.
Which of the following will not induce an emf in a coil in the absence of an external voltage source?
(a) the coil being in a time-varying magnetic field.
(b) the coil moving in a time-varying magnetic field.
(c) the coil moving in a constant magnetic field.
(d) the coil is stationary in external spatially varying magnetic field, which does not change with time.

Answer

Answer: (d) the coil is stationary in external spatially varying magnetic field, which does not change with time.

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Question 6.
A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. This can be because
(a) the magnetic field is constant.
(b) the magnetic field is in the same plane as the circular coil and it may or may not vary.
(c) the magnetic field has a perpendicular (to the plane of the coil) component whose magnitude is constant.
(d) there is a constant magnetic field in the perpendicular (to the plane of the coil) direction.

Answer

Answer: (b) the magnetic field is in the same plane as the circular coil and it may or may not vary.

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Question 7.
The mutual inductance M₁₂ of coil 1 with respect to coil
(a) decreases when they are brought nearer.
(b) depends on the current passing through the coils.
(c) increases when one of them is rotated about an axis.
(d) is the same as M₂₁ of coil 2 with respect to coil 1.

Answer

Answer: (d) is the same as M₂₁ of coil 2 with respect to coil 1.

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Question 8.
Consider a metal ring kept on a horizontal plane. A bar magnet is held above the ring with its length along the central axis of the ring. If the magnet is now dropped freely, the acceleration of the falling magnet is (g is acceleration due to gravity)

(a) More than g
(b) Equal to g
(c) Less than g
(d) Depends on mass of magnet

Answer

Answer: (c) Less than g

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Question 9.
A wheel with ten metallic spokes each 0.50 m long is rotated with a speed of 120 rpm in a place normal to the earth’s magnetic field at the place. If the magnitude of the field is 0.04 G, the induced emf between the axle and the rim of the wheel is equal to
(a) 1.256 × 10^-3 V
(b) 6.28 × 10^-3 V
(c) 1.256 × 10^-4 V
(d) 6.28 × 10^-6 V

Answer

Answer: (d) 6.28 × 10^-6 V

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Question 10.
The coefficient of self-inductance of a solenoid is 0.18 mH. If a rod of soft iron of relative permeability 900 is inserted, then the coefficient of self-inductance will become nearly
(a) 5.4 mH
(b) 162 mH
(c) 0.006 mH
(d) 0.0002 mH

Answer

Answer: (b) 162 mH

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II. Fill in the blanks

Question 1.
………………… the magnetic flux can produce an electric current.

Answer

Answer: Changing

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Question 2.
Magnetic flux through an area is given by ……………

Answer

Answer: Φ = BA cos θ

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Question 3.
……………… is the SI unit of magnetic flux.

Answer

Answer: weber

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Question 4.
The magnitude of the induced emf in a circuit is equal to the time rate of change of ……………. through the circuit.

Answer

Answer: Magnetic flux

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Question 5.
The statement “The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it” is called ………………. law.

Answer

Answer: Lenz’s

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Question 6.
The emf induced in a rod of length / moving with velocity v in a uniform magnetic field B is …………….

Answer

Answer: Blv

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Question 7.
Eddy currents are of ……………… nature.

Answer

Answer: Opposing

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Question 8.
The induced ……………… does not depend upon the time-interval.

Answer

Answer: Charge

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Question 9.
The SI unit of mutual inductance is ……………….

Answer

Answer: henry

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Question 10.
Two coils have mutual inductance of 1.5 henry. If the current in the primary circuit is raised by 5 A in one millisecond after closing the circuit, then the induced emf in secondary coil is ……………… volt.

Answer

Answer: 7.5 × 10^-3

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Question 11.
Two concentric circular coils one of small radius a₁ and the other of large radius a₂ such that a₁ << a₂, are placed co-axially with centres coinciding. The mutual inductance of the arrangement is ………………

Answer

Answer: \(\frac { µ_0l_2a_1^2 }{2a_2}\)

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Question 12.
Self-inductance of a long solenoid (A, N, l) with core material of magnetic relative permeability µ_r is (where A = area of each turn, N = number of turns, L = length of solenoid)

Answer

Answer: µ₀µ_rN²A/l

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Question 13.
A closed loop moves normal to the constant electric field between the plates of a large capacitor, then no ……………….. is induced in the loop.

Answer

Answer: Current

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Question 14.
According to the reciprocity theorem, the mutual inductance of one coil with respect to the other is ……………..

Answer

Answer: M = µ₀n₁n₂πr\(_1^2\) l

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Question 15.
Fleming’s right hand rule gives the direction of ………………. current.

Answer

Answer: induced

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Question 16.
Metal detector is based on the concept of …………….. currents.

Answer

Answer: Eddy

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Question 17.
The energy stored in an inductor is ………………..

Answer

Answer: LI²/2

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Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Physics Electromagnetic Induction MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 7 Alternating Current with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers are prepared as per the Latest Exam Pattern. Students can solve these Alternating Current Class 12 MCQs Questions with Answers and assess their preparation level.

Alternating Current Class 12 MCQs Questions with Answers

Solving the Alternating Current Multiple Choice Questions of Class 12 Physics Chapter 7 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Alternating Current Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 7 Physics Class 12 and cross-check your answers during preparation.

I. Choose the correct answer

Question 1.
If the rms current in a 50 Hz ac circuit is 5 A, the value of the current 1/300 second after its value becomes zero is
(a) 5√2A
(b) 5√3 /2 A
(c) 5/6 A
(d) 5/√2 A

Answer

Answer: (b) 5√3 /2 A

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Question 2.
To reduce the resonant frequency in an LCR series circuit with a generator
(a) the generator frequency should be reduced.
(b) another capacitor should be added in parallel to the first.
(c) the iron core of the inductor should be removed.
(d) dielectric in the capacitor should be removed.

Answer

Answer: (b) another capacitor should be added in parallel to the first.

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Question 3.
The output of a step-down transformer is measured to be 24 V when connected to a 12 watt light bulb. The value of the peak current is
(a) 1/√2A
(b) √2A
(c) 2A
(d) 2√V2A

Answer

Answer: (a) 1/√2A

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Question 4.
In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?
(a) Only resistor.
(b) Resistor and an inductor.
(c) Capacitor and an inductor.
(d) Only a capacitor.

Answer

Answer: (d) Only a capacitor.

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Question 5.
As the frequency of an ac circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit?
(a) Inductor and capacitor.
(b) Resistor and inductor.
(c) Resistor and capacitor.
(d) None.

Answer

Answer: (a) Inductor and capacitor.

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Question 6.
When an AC voltage of 220 V is applied to the capacitor C
(a) the maximum voltage between plates is 220 V.
(b) the current is in phase with the applied voltage.
(c) the charge on the plates is out of phase with the applied voltage.
(d) power delivered to the capacitor is zero.

Answer

Answer: (d) power delivered to the capacitor is zero.

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Question 7.
Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is incorrect?
(a) For a given power level, there is a lower current.
(b) Lower current implies less power loss.
(c) Transmission lines can be made thinner.
(d) It is easy to reduce the voltage at the receiving end using step-down transformers.

Answer

Answer: (c) Transmission lines can be made thinner.

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Question 8.
In an ac circuit, V and i are given by V = 100 sin (100 t) volt and i = 100 sin (100 + \(\frac { π }{3}\)) mA. The power dissipated in circuit is
(a) 104 W
(b) 10 W
(c) 2.5 W
(d) 5 W

Answer

Answer: (c) 2.5 W

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Question 9.
A small signal voltage V(t) = V₀ sinω t is applied across an ideal capacitor C
(a) Current l (t) lags voltage V(t) by 90°.
(b) Over a full cycle the capacitor C does not consume any energy from the voltage source.
(c) Current l(t) is in phase with voltage V(t).
(d) Current l(t) leads voltage V(t) by 180°.

Answer

Answer: (b) Over a full cycle the capacitor C does not consume any energy from the voltage source.

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Question 10.
The potential differences across the resistor, capacitor and inductor are 80 V, 40 V and 100 V, respectively in an LCR circuit. The power factor of this circuit is:
(a) 0.8
(b) 1.0
(c) 0.4
(d) 0.5

Answer

Answer: (a) 0.8

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II. Fill in the Blanks

Question 1.
A steady (dc) current which when passed through a circuit for half the time period of ac will send the same amount of charge as is sent by ac through the same circuit for the same time is called ……………….

Answer

Answer: Average or mean value of ac

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Question 2.
A steady current (dc) which when passed through a resistor in a given time produces the same heat as is produced by the ac. when passed through the same resistor for the same time is called ……………….

Answer

Answer: Root mean square value of ac

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Question 3.
When ac flows through a pure resistor, emf and current are in ……………..

Answer

Answer: Phase

---

Question 4.
When ac flows through a pure inductor, emf …………….. current by an angle π/2.

Answer

Answer: Leads

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Question 5.
When ac flows through a pure capacitor, emf ……………… current by an angle π/2.

Answer

Answer: Lags

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Question 6.
…………….. is the ratio of the rms value to the mean or average value of ac.

Answer

Answer: Form factor

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Question 7.
AC flows only on the surface of a wire. This effect is called ……………….. “effect”.

Answer

Answer: Skin

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Question 8.
In ac-circuit, the average power consumed by a pure capacitor during one cycle in pure capacitance is ………………..

Answer

Answer: Zero

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Question 9.
In ac-circuit, the average power consumed by a pure inductor during one cycle in pure capacitance is ………………..

Answer

Answer: Zero

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Question 10.
If the power loss in a circuit is zero, the current is called ………………

Answer

Answer: Wattless current

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Question 11.
A choke is preferred over resistance in an ac-circuit to decrease ac-current because it consumes practically ……………… power.

Answer

Answer: Zero

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Question 12.
At resonance the current in a circuit is ……………..

Answer

Answer: Maximum

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Question 13.
At resonance an LCR circuit behaves as a pure ……………….. circuit.

Answer

Answer: Resistive

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Question 14.
The ratio \(\frac { ω_0 }{Δω}\) is called ……………….

Answer

Answer: Quality

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Question 15.
Average power is equal to the product of virtual power and ………………

Answer

Answer: Power factor

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Question 16.
……………….. is a device to convert a low voltage at high current, to a high voltage at low current and vice versa.

Answer

Answer: Transformer

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Question 17.
AC dynamo is based on the principle of …………….. induction.

Answer

Answer: Electromagnetic

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Question 18.
An ac dynamo has ………………. rings.

Answer

Answer: Slip

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Question 19.
Maximum emf Induced in an ac dynamo is ……………………

Answer

Answer: nBAω

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Question 20.
The core of a transformer is laminated to reduce …………………

Answer

Answer: Eddy currents

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Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 7 Alternating Current with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Physics Alternating Current MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 10 Wave Optics with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers are prepared as per the Latest Exam Pattern. Students can solve these Wave Optics Class 12 MCQs Questions with Answers and assess their preparation level.

Wave Optics Class 12 MCQs Questions with Answers

Solving the Wave Optics Multiple Choice Questions of Class 12 Physics Chapter 10 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Wave Optics Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 10 Physics Class 12 and cross-check your answers during preparation.

I. Choose the correct answer

Question 1.
In a Young’s doubles-slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case
(a) there shall be alternate interference patterns of red and blue.
(b) there shall be an interference pattern for red distinct from that for blue.
(c) there shall be no interference fringes.
(d) there shall be an interference pattern for red mixing with one for blue.

Answer

Answer: (c) there shall be no interference fringes.

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Question 2.
Figure shows a standard two-slit arrangement with slits S₁, S₂. P₁, P₂ are the two minima points on either side of P (figure). At P₂ on the screen, there is a hole and behind P₂ is a second 2-slit arrangement with slits S₃, S₄ and a second screen behind them.

(a) There would be no interference pattern on the second screen but it would be lighted.
(b) The second screen would be totally dark.
(c) There would be a single bright point on the second screen.
(d) There would be a regular two-slit pattern on the second screen.

Answer

Answer: (d) There would be a regular two-slit pattern on the second screen.

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Question 3.
In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment.
(a) 500 nm
(b) 600 nm
(c) 700 nm
(d) 600 Å

Answer

Answer: (b) 600 nm

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Question 4.
In Young’s double-slit experiment the separation d between the slits is 2 mm, the wavelength X of the light used is 5896 A and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to:
(a) 1.8 mm
(b) 1.9 mm
(c) 2.1 mm
(d) 1.7 mm

Answer

Answer: (b) 1.9 mm

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Question 5.
The angular width of the central maximum in a single-slit diffraction pattern is 60°. The width of the slit is 1 mm. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young’s fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance? (i.e. distance between the centres of each slit)
(a) 50 mm
(b) 75 mm
(c) 100 mm
(d) 25 mm

Answer

Answer: (d) 25 mm

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Question 6.
Two coherent point sources S₁ and S₂ are separated by a small distance ‘d’ as shown. The fringes obtained on the screen will be:

(a) points
(b) straight lines
(c) semi-circles
(d) concentric circles

Answer

Answer: (d) concentric circles

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Question 7.
The Young’s double-slit experiment is performed with blue and green light of wavelengths 436 nm and 546 nm, respectively. If x is the distance of 4th maxima from the central one, then
(a) x_blue = x_green
(b) x_blue > x_green
(c) x_blue < x_green
(d) x_blue / x_green

Answer

Answer: (c) x_blue < x_green

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Question 8.
In a Young’s double-slit experiment, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is:
(a) 9.75 mm
(b) 15.6 mm
(c) 1.56 mm
(d) 7.8 mm

Answer

Answer: (d) 7.8 mm

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Question 9.
An interference pattern is observed by Young’s double-slit experiment. If now the separation between coherent sources is halved and the distance of screen from coherent sources is doubled, then fringe width
(a) becomes double
(b) becomes one-fourth
(c) remains same
(d) becomes four times

Answer

Answer: (d) becomes four times

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Question 10.
A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5 × 10^-5cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is:
(a) 0.20 cm
(b) 0.15 cm
(c) 0.10 cm
(d) 0.25 cm

Answer

Answer: (b) 0.15 cm

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II. Fill in the blanks

Question 1.
Light has …………….. nature.

Answer

Answer: Dual

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Question 2.
According to Huygen’s principle all points on a given wavefront are taken as ………………

Answer

Answer: point sources

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Question 3.
A spherical wavefront Is due to a …………….. source of light.

Answer

Answer: Point

---

Question 4.
For sustained interference of light the waves emitted by the two sources must have a ………………… phase difference.

Answer

Answer: Constant

---

Question 5.
Two independent sources ……………….. produce sustained interference.

Answer

Answer: cannot

---

Question 6.
In Young’s double slit experiment, the fringe width is given by ………………..

Answer

Answer: ß = Dλ/d

---

Question 7.
Fringe width is different as the separation between two consecutive ………………… or ………………

Answer

Answer: Maxima, minima

---

Question 8.
Continuous locus of oscillation with constant phase is called ………………

Answer

Answer: Wavefront

---

Question 9.
……………… of light occurs when size of the obstacle of aperture is comparable of wavelength of light.

Answer

Answer: Diffraction

---

Question 10.
In interference and ……………….., the light energy is redistributed which increases in one region and decreases in other.

Answer

Answer: Diffraction

---

Question 11.
Poloroid is a device to produce and detect ……………….. polorised light.

Answer

Answer: Plane

---

Question 12.
A beam of light is incident normally upon a polariser and the intensity of emergent beam is l0. The intensity of the emergent beam is found to be unchanged when the polariser is rotated about an axis perpendicular to the pass axis. Incident beam is ……………….. in nature.

Answer

Answer: Unpolarised

---

Question 13.
Polarisation phenomenon are exhibited by the …………………. waves only.

Answer

Answer: Transverse

---

Question 14.
The value of Brewster Angle depends on the nature of the transparent refracting medium and the ………………….. of light used.

Answer

Answer: Wavelength

---

Question 15.
At polarising angle the refracted and reflected are ……………….. to each other.

Answer

Answer: Perpendicular

---

Question 16.
The intensity in sunglasses and window panes can be controlled by ……………….

Answer

Answer: Polaroid

---

Question 17.
Intensity of light is determined by ……………….. of the amplitude of oscillating electric field.

Answer

Answer: Square

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Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 10 Wave Optics with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Physics Wave Optics MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers are prepared as per the Latest Exam Pattern. Students can solve these Dual Nature of Radiation and Matter Class 12 MCQs Questions with Answers and assess their preparation level.

Dual Nature of Radiation and Matter Class 12 MCQs Questions with Answers

Solving the Dual Nature of Radiation and Matter Multiple Choice Questions of Class 12 Physics Chapter 11 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Dual Nature of Radiation and Matter Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 11 Physics Class 12 and cross-check your answers during preparation.

I. Choose the correct answer

Question 1.
When the light of frequency 2v₀ (where v₀ is threshold frequency) is incident on a metal plate, the maximum velocity of electrons emitted is v₁. When the frequency of the incident radiation is increased to 5v₀, the maximum velocity of electrons emitted from the same plate is v₂. The ratio of v₁ to v₂ is:
(a) 1 : 2
(b) 1 : 4
(c) 4 : 1
(d) 2 : 1

Answer

Answer: (a) 1 : 2

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Question 2.
The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1 MeV energy is nearly
(a) 1.2 nm
(b) 1.2 × 10^-3 nm
(c) 1.2 × 10^-6 nm
(d) 1.2 × 10¹ nm

Answer

Answer: (b) 1.2 × 10^-3 nm

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Question 3.
A proton, a neutron, an electron and an a-particle have same energy. Then their de-Broglie wavelengths compare as
(a) λ_p = λ_n > λ_e > λ_a
(b) λ_α < λ_p = λ_n > λ_e
(c) λ_e < λ_p = λ_n > λ_a
(d) λ_e = λ_p = λ_n = λ_a

Answer

Answer: (b) λ_α < λ_p = λ_n > λ_e

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Question 4.
The photoelectric threshold wavelength of silver is 3250 × 10^-10 m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 × 10^-10 m is:
(Given h = 4.14 × 10^-15 eVs and c = 3 × 10⁸ m s^-1)
(a) = 0.6 × 10⁵ m s^-1
(b) = 61 × 10³ m s^-1
(c) = 0.3 × 10⁶ m s^-1
(d) = 6 × 10⁵ m s^-1

Answer

Answer: (d) = 6 × 10⁵ m s^-1

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Question 5.
An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If λ_min is the smallest possible wavelength of X-ray in the spectrum, the variation of log λ_min with log V is correctly represented in:

Answer

Answer:

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Question 6.
Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is
(a) – 1 V
(b) – 3 V
(b) + 3 V
(d) + 4 V

Answer

Answer: (b) – 3 V

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Question 7.
A particle is dropped from a height H. The de-Broglie wavelength of the particle as a function of height is proportional to
(a) H
(b) H^1/2
(c) H°
(d) H^-1/2

Answer

Answer: (d) H^-1/2

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Question 8.
An electron is moving with an initial velocity \(\vec {v}\) = v₀\(\hat {j}\) and is in a magnetic field
\(\vec {B}\) = B₀\(\hat {j}\). Then its de-Broglie wavelength
(a) remains constant
(b) increases with time
(c) decreases with time
(d) increases and decreases periodically

Answer

Answer: (a) remains constant

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Question 9.
An electron (mass m) with an initial velocity \(\vec {v}\) = v₀\(\hat {j}\) is in an electric field
\(\vec {E}\) = E₀\(\hat {j}\). If λ₀ = \(\frac { h }{mv_0}\), its de-Broglie wavelength at time t is given by
(a) λ₀
(b) λ₀ \(\sqrt{1+\left(\frac{e E_{0} t}{m v_{0}}\right)^{0}}\)
(c) \(\frac{\lambda_{0}}{\sqrt{1+\left(\frac{e E_{0} t^{t}}{m v_{0}}\right)^{2}}}\)
(d) \(\frac{\lambda_{0}}{1+\left(\frac{e E_{0} t}{m v_{0}}\right)^{2}}\)

Answer

Answer: (c) \(\frac{\lambda_{0}}{\sqrt{1+\left(\frac{e E_{0} t^{t}}{m v_{0}}\right)^{2}}}\)

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II. Fill in the blanks

Question 1.
……………… is the phenomenon of the emission of electrons from a metal surface when radiation of suitable frequency falls on the metal surface.

Answer

Answer: Photoelectric effect

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Question 2.
The phenomenon of emission of electrons from a hot metal surface is called ………………

Answer

Answer: Thermionic emission

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Question 3.
The minimum energy required by a free electron to just escape from the metal surface is called ………………

Answer

Answer: Work function

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Question 4.
This unit of energy commonly used in atomic and nuclear physics is ………………

Answer

Answer: Electron volt (eV)

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Question 5.
The work function (Ø₀) depends on the properties of the metal and the ……………… of its surface.

Answer

Answer: Nature

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Question 6.
……………… is defined as the energy acquired by an electron when it is accelerated through a potential difference of 1 volt.

Answer

Answer: Electron volt

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Question 7.
The energy of the photon is given by ………………

Answer

Answer: E = hv = \(\frac { hc }{λ}\).

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Question 8.
The velocity of photon in different media is ………………

Answer

Answer: Different

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Question 9.
The rest mass of a photon is ………………

Answer

Answer: Zero

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Question 10.
In a photon-particle collision (such as photon-electron collision), the total ……………… and total momentum are conserved.

Answer

Answer: Energy

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Question 11.
The maximum kinetic energy of emitted photoelectrons depends on the ……………… of incident radiation and the nature of material.

Answer

Answer: Frequency

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Question 12.
The maximum kinetic energy of emitted photoelectrons is independent of ……………… of incident radiation.

Answer

Answer: Intensity

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Question 13.
The photoelectric current of emitted photoelectrons depends on the ……………… of incident radiation.

Answer

Answer: Intensity

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Question 14.
The photo-electric current of emitted photoelectrons is independent of the ……………… of incident radiation.

Answer

Answer: Frequency

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Question 15.
The minimum frequency required to eject an electron from the surface of a metal surface is called ……………… frequency.

Answer

Answer: Threshold

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Question 16.
For a frequency v of incident radiation, ……………… than the cut-off frequency v₀, no photoelectric emission is possible even if the intensity is large.

Answer

Answer: lower

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Question 17.
Photons are electrically ……………… and are not deflected by electric and magnetic fields.

Answer

Answer: Neutral

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Question 18.
Davison-Germer experiment verified the ……………… nature of moving electrons.

Answer

Answer: Wave

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Question 19.
The expression for de-Broglie wavelength of an electron moving under a potential difference of V volt is ………………

Answer

Answer: λ = \(\frac { 1.227 }{√V}\) nm

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Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Physics Dual Nature of Radiation and Matter MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 12 Atoms with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers are prepared as per the Latest Exam Pattern. Students can solve these Atoms Class 12 MCQs Questions with Answers and assess their preparation level.

Atoms Class 12 MCQs Questions with Answers

Solving the Atoms Multiple Choice Questions of Class 12 Physics Chapter 12 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Atoms Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 12 Physics Class 12 and cross-check your answers during preparation.

I. Choose the correct answer

Question 1.
The simple Bohr model cannot be directly applied to calculate the energy levels of an atom with many electrons. This is because
(a) of the electrons not being subject to a central force.
(b) of the electrons colliding with each other
(c) of screening effects
(d) the force between the nucleus and an electron will no longer be given by Coulomb’s law.

Answer

Answer: (a) of the electrons not being subject to a central force.

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Question 2.
A set of atoms in an excited state decay.
(a) in general, to any of the states with lower energy.
(b) into a lower state only when excited by an external electric field.
(c) all together simultaneously into a lower state.
(d) to emit photons only when they collide.

Answer

Answer: (a) in general, to any of the states with lower energy.

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Question 3.
The ground state energy of hydrogen atom is -13.6 eV. The kinetic and potential energies of the electron in this state are
(a) -13.6 eV, 27.2 eV
(b) 13.6 eV,-13.6 eV
(c) 13.6 eV,-27.2 eV
(d) 27.2 eV,-27.2 eV

Answer

Answer: (c) 13.6 eV,-27.2 eV

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Question 4.
If the series limit frequency of the Lyman series is v_L, then the series limit frequency of the Pfund series is:
(a) 16 v_L
(b) v_L/16
(c) V_L/25
(d) 25 v_L

Answer

Answer: (c) V_L/25

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Question 5.
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is
(a) 1 : 1
(b) 1 : -1
(c) 2 : -1
(d) 1 : -2

Answer

Answer: (b) 1 : -1

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Question 6.
Ionisation energy for hydrogen atom in the ground state is E. What is the ionisation energy of Li⁺⁺ atom in the 2nd excited state
(a) E
(b) 3E
(c) 6E
(d) 9E

Answer

Answer: (a) E

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Question 7.
Hydrogen (H\( _{ 1 }^{1}\)), deuterium (H\( _{ 1 }^{2}\)), singly ionised helium (He\( _{ 2 }^{4}\))⁺ and doubly ionised lithium (Li\( _{ 3 }^{6}\))⁺⁺ all have one electron around their nucleus. Consider an electron transition from n = 2 to n = 1 if the wavelengths of the emitted radiations are λ₁, λ₂, λ₃ and λ₄ respectively then approximately which of the following is correct?
(a) 4λ₁ = 2λ₂ = 2λ₃ = λ₄
(b) λ₁ = 2λ₂ = 2λ₃ = λ₄
(c) λ₁ = λ₂ = 4λ₃ = 9λ₄
(d) λ₁ = 2λ₂ = 3λ₃ = 4λ₄

Answer

Answer: (c) λ₁ = λ₂ = 4λ₃ = 9λ₄

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Question 8.
As an electron makes a transition from an excited state to the ground state of a hydrogen like atom/ion:
(a) its kinetic energy increases but potential energy and total energy decrease
(b) kinetic energy, potential energy and total energy decrease
(c) kinetic energy decreases, potential energy increases but total energy remains the same
(d) kinetic energy and total energy decrease but potential energy increases

Answer

Answer: (a) its kinetic energy increases but potential energy and total energy decrease

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Question 9.
An electron from various excited states of hydrogen atom emits radiation to come to the ground state. Let λ_n, λ_g be the de-Broglie wavelength of the electron in the nth state and the ground state respectively. Let ∧_n be the wavelength of the emitted photon in the transition from the nth state to the ground state. For large n (A, B are constants)
(a) ∧_n = A + Bλ_n
(b) ∧_n = A + Bλ\(_{ n }^{2}\)
(c) ∧\(_{ n }^{2}\) = X
(d) ∧_n = A + \(\frac { B }{λ_n^2}\)

Answer

Answer: (d) ∧_n = A + \(\frac { B }{λ_n^2}\)

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II. Fill in the blanks

Question 1.
The a-scattering experiment was performed around 1911 by ……………… and ………………

Answer

Answer: Geiger, Marsden

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Question 2.
One in ……………… α-particles retraced their path in the a scattering experiment.

Answer

Answer: 8000

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Question 3.
The angle of scattering θ for zero value of impact parameter b is ………………

Answer

Answer: 180°

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Question 4.
The scattering angle will decrease with the ……………… in impact parameter.

Answer

Answer: Increase

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Question 5.
The smallest distance between the nucleus and the alpha particle for a head-on collision towards the nucleus is called the ………………

Answer

Answer: Distance of closest approach

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Question 6.
The radius of an atom is about ……………… m and that of nucleus is ……………… m.

Answer

Answer: 10^-10 and 10^-15

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Question 7.
The Rutherford’s model of an atom cannot explain the characteristics ……………… spectrum emitted by H-atom.

Answer

Answer: Line

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Question 8.
When an electron jumps from an outer stationary orbit of energy E₂ to an inner stationary orbit of energy E₁ the frequency of radiation emitted = ………………

Answer

Answer: v = \(\frac { E_2 – E_1 }{h}\)

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Question 9.
If the size of first orbit of hydrogen atom is 0.5 Å, the size of second orbit of hydrogen atom would be ………………

Answer

Answer: 2 Å

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Question 10.
The frequency spectrum of radiation emitted as per Rutherford’s model of atom is ………………

Answer

Answer: Continuous

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Question 11.
According to de Broglie a stationary orbit is that which contains an ……………… number of de-Broglie waves associated with the revolting electron.

Answer

Answer: integral

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Question 12.
Energy possessed by an electron for (n → ∞)th orbit is ………………

Answer

Answer: Zero

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Question 13.
The speed of an electron in the first orbit of hydrogen atoms is ………………

Answer

Answer: v = c/137n

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Question 14.
The total energy of an electron in an orbit of hydrogen atom is ……………… of the kinetic energy.

Answer

Answer: Negative

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Question 15.
The potential energy of the electron in an orbit of hydrogen atom is negative of ……………… the kinetic energy.

Answer

Answer: Twice

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Question 16.
The ……………… energy is the energy required to excite an electron to a higher energy level.

Answer

Answer: Excitation

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Question 17.
The ……………… energy is the energy required by an electron to set itself free.

Answer

Answer: Ionisation

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Question 18.
Energy possessed by an electron in the ground state of hydrogen atom is ……………… eV.

Answer

Answer: -13.6

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Question 19.
Total energy of electron in a stationary orbit is ……………… which means the electron is bound to the nucleus and is not free to leave it.

Answer

Answer: Negative

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Question 20.
The value of Rydberg constant is ………………

Answer

Answer: 1.09 × 10⁷ m^-1

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Question 21.
When an electron jumps from 2nd stationary orbit of hydrogen atom to 1st stationary orbit, the energy emitted is ………………

Answer

Answer: 10.2 eV

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Question 22.
……………… series lies in the ultraviolet region.

Answer

Answer: Lyman

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Question 23.
……………… of hydrogen spectrum which lies in the visible region electromagnetic spectrum.

Answer

Answer: Balmer series

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Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 12 Atoms with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Physics Atoms MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.