{"id":19052,"date":"2022-06-04T05:30:41","date_gmt":"2022-06-04T00:00:41","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=19052"},"modified":"2022-05-23T14:56:32","modified_gmt":"2022-05-23T09:26:32","slug":"mcq-questions-for-class-12-physics-chapter-7","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/mcq-questions-for-class-12-physics-chapter-7\/","title":{"rendered":"MCQ Questions for Class 12 Physics Chapter 7 Alternating Current with Answers"},"content":{"rendered":"

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<\/a> 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.<\/p>\n

Alternating Current Class 12 MCQs Questions with Answers<\/h2>\n

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.<\/p>\n

I. Choose the correct answer<\/span><\/p>\n

Question 1.
\nIf 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
\n(a) 5\u221a2A
\n(b) 5\u221a3 \/2 A
\n(c) 5\/6 A
\n(d) 5\/\u221a2 A<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) 5\u221a3 \/2 A<\/p>\n<\/details>\n

\n

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

\nAnswer<\/span><\/summary>\n

Answer: (b) another capacitor should be added in parallel to the first.<\/p>\n<\/details>\n

\n

Question 3.
\nThe 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
\n(a) 1\/\u221a2A
\n(b) \u221a2A
\n(c) 2A
\n(d) 2\u221aV2A<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 1\/\u221a2A<\/p>\n<\/details>\n

\n

Question 4.
\nIn 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?
\n(a) Only resistor.
\n(b) Resistor and an inductor.
\n(c) Capacitor and an inductor.
\n(d) Only a capacitor.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Only a capacitor.<\/p>\n<\/details>\n

\n

Question 5.
\nAs 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?
\n(a) Inductor and capacitor.
\n(b) Resistor and inductor.
\n(c) Resistor and capacitor.
\n(d) None.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Inductor and capacitor.<\/p>\n<\/details>\n

\n

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

\nAnswer<\/span><\/summary>\n

Answer: (d) power delivered to the capacitor is zero.<\/p>\n<\/details>\n

\n

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

\nAnswer<\/span><\/summary>\n

Answer: (c) Transmission lines can be made thinner.<\/p>\n<\/details>\n

\n

Question 8.
\nIn an ac circuit, V and i are given by V = 100 sin (100 t) volt and i = 100 sin (100 + \\(\\frac { \u03c0 }{3}\\)) mA. The power dissipated in circuit is
\n(a) 104 W
\n(b) 10 W
\n(c) 2.5 W
\n(d) 5 W<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) 2.5 W<\/p>\n<\/details>\n

\n

Question 9.
\nA small signal voltage V(t) = V0<\/sub> sin\u03c9 t is applied across an ideal capacitor C
\n(a) Current l (t) lags voltage V(t) by 90\u00b0.
\n(b) Over a full cycle the capacitor C does not consume any energy from the voltage source.
\n(c) Current l(t) is in phase with voltage V(t).
\n(d) Current l(t) leads voltage V(t) by 180\u00b0.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Over a full cycle the capacitor C does not consume any energy from the voltage source.<\/p>\n<\/details>\n

\n

Question 10.
\nThe 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:
\n(a) 0.8
\n(b) 1.0
\n(c) 0.4
\n(d) 0.5<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 0.8<\/p>\n<\/details>\n

\n

II. Fill in the Blanks<\/span><\/p>\n

Question 1.
\nA 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 ……………….<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Average or mean value of ac<\/p>\n<\/details>\n

\n

Question 2.
\nA 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 ……………….<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Root mean square value of ac<\/p>\n<\/details>\n

\n

Question 3.
\nWhen ac flows through a pure resistor, emf and current are in ……………..<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Phase<\/p>\n<\/details>\n

\n

Question 4.
\nWhen ac flows through a pure inductor, emf …………….. current by an angle \u03c0\/2.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Leads<\/p>\n<\/details>\n

\n

Question 5.
\nWhen ac flows through a pure capacitor, emf ……………… current by an angle \u03c0\/2.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Lags<\/p>\n<\/details>\n

\n

Question 6.
\n…………….. is the ratio of the rms value to the mean or average value of ac.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Form factor<\/p>\n<\/details>\n

\n

Question 7.
\nAC flows only on the surface of a wire. This effect is called ……………….. \u201ceffect\u201d.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Skin<\/p>\n<\/details>\n

\n

Question 8.
\nIn ac-circuit, the average power consumed by a pure capacitor during one cycle in pure capacitance is ………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Zero<\/p>\n<\/details>\n

\n

Question 9.
\nIn ac-circuit, the average power consumed by a pure inductor during one cycle in pure capacitance is ………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Zero<\/p>\n<\/details>\n

\n

Question 10.
\nIf the power loss in a circuit is zero, the current is called ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Wattless current<\/p>\n<\/details>\n

\n

Question 11.
\nA choke is preferred over resistance in an ac-circuit to decrease ac-current because it consumes practically ……………… power.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Zero<\/p>\n<\/details>\n

\n

Question 12.
\nAt resonance the current in a circuit is ……………..<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Maximum<\/p>\n<\/details>\n

\n

Question 13.
\nAt resonance an LCR circuit behaves as a pure ……………….. circuit.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Resistive<\/p>\n<\/details>\n

\n

Question 14.
\nThe ratio \\(\\frac { \u03c9_0 }{\u0394\u03c9}\\) is called ……………….<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Quality<\/p>\n<\/details>\n

\n

Question 15.
\nAverage power is equal to the product of virtual power and ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Power factor<\/p>\n<\/details>\n

\n

Question 16.
\n……………….. is a device to convert a low voltage at high current, to a high voltage at low current and vice versa.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Transformer<\/p>\n<\/details>\n

\n

Question 17.
\nAC dynamo is based on the principle of …………….. induction.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Electromagnetic<\/p>\n<\/details>\n

\n

Question 18.
\nAn ac dynamo has ………………. rings.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Slip<\/p>\n<\/details>\n

\n

Question 19.
\nMaximum emf Induced in an ac dynamo is ……………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: nBA\u03c9<\/p>\n<\/details>\n

\n

Question 20.
\nThe core of a transformer is laminated to reduce …………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Eddy currents<\/p>\n<\/details>\n

\n

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.<\/p>\n","protected":false},"excerpt":{"rendered":"

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 …<\/p>\n

MCQ Questions for Class 12 Physics Chapter 7 Alternating Current with Answers<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[35],"tags":[],"yoast_head":"\nMCQ Questions for Class 12 Physics Chapter 7 Alternating Current with Answers - MCQ Questions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mcq-questions.com\/mcq-questions-for-class-12-physics-chapter-7\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MCQ Questions for Class 12 Physics Chapter 7 Alternating Current with Answers - MCQ Questions\" \/>\n<meta property=\"og:description\" content=\"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. 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