{"id":28664,"date":"2021-07-07T18:47:49","date_gmt":"2021-07-07T13:17:49","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=28664"},"modified":"2022-03-02T10:30:15","modified_gmt":"2022-03-02T05:00:15","slug":"ncert-solutions-for-class-10-science-chapter-14","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/ncert-solutions-for-class-10-science-chapter-14\/","title":{"rendered":"NCERT Solutions for Class 10 Science Chapter 14 Sources of Energy"},"content":{"rendered":"

These NCERT Solutions for Class 10 Science<\/a> Chapter 14 Sources of Energy Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams.<\/p>\n

Sources of Energy NCERT Solutions for Class 10 Science Chapter 14<\/h2>\n

Class 10 Science Chapter 14 Sources of Energy InText Questions and Answers<\/h3>\n

In-text Questions (Page 243)<\/span><\/p>\n

Question 1.
\nWhat is a good source of energy ?
\nAnswer:
\nSun.<\/p>\n

Question 2.
\nWhat is a good fuel ?
\nAnswer:
\nA fuel which burns in air\/oxygen with a moderate rate and produces a large amount of energy is called a good fuel, e.g. L.P.G.<\/p>\n

Question 3.
\nIf you could use any source of energy for heating your food, which one would you use and why?
\nAnswer:
\nL.P.G. because it has high calorific value.<\/p>\n

In-text Questions (Page 248)<\/span><\/p>\n

Question 1.
\nWhat are the disadvantages of fossil fuels ?
\nAnswer:
\nDisadvantages of fossil fuels :
\n(i) It is a non-renewable source of energy. If we were to continue consuming these courses as such fast rates, we would soon face energy crisis.<\/p>\n

(ii) Fossil fuels cause air pollution. The oxides of carbon, nitrogen and sulphur that are released on burning fossil fuels are acidic oxides. These lead to acid rain which affects our water and soil resources.<\/p>\n

Question 2.
\nWhy are we looking at alternate sources of energy ?
\nAnswer:
\nIn ancient time, wood was the most common source of heat energy. The exploitation of coal and petroleum of energy made the industrialisation possible. The growing demand for energy was largely met by the fossil fuels, coal and petroleum. Our technologies were also developed for using these energy sources. But these fuels were formed over millions of years ago and there are only limited resources. If we were to continue consuming these sources at such alarming rates, we would soon face energy crises, In order to avoid this, we are looking at alternate source of energy.<\/p>\n

Question 3.
\nHow has the traditional use of wind and water energy been modified for our convenience ?
\nAnswer:
\nThe kinetic energy of the wind can be used to do work. This energy was harnessed, by windmills in the past to do mechanical work such as in a water lifting pump. The rotatory motion of windmill is utilised to lift water form a well. But nowadays, wind energy is used to generate electricity. To generate electricity, the rotatory motion of the windmill is used to turn the turbine of the electric generator.<\/p>\n

The kinetic energy of flowing water or potential energy of water at a height can be converted into electricity. The hydropower plants are associated with dams. The water from the high level in the dam is carried through pipes, to the turbine and thus electricity is generated.<\/p>\n

\"NCERT<\/p>\n

In-text Questions (Page 253)<\/span><\/p>\n

Question 1.
\nWhat kind of mirror concave, convex or plain-would Be best suited for use in a solar cooker ? Why?
\nAnswer:
\nPlane mirror, because it is a good reflector and a temperature inside the cooker goes upto 100\u00b0 to 140\u00b0c. This heat is sufficient to cook the food easily. If other mirrors are used, the temperature is very low or high. At low temp, food is not cooked well and at very high temperature food is damaged or looses its taste.<\/p>\n

Question 2.
\nWhat are the limitations of the energy that can be obtained form the oceans ?
\nAnswer:<\/p>\n

    \n
  1. The energy potential from the oceans is quite large, but efficient commerical exploitation is difficult.<\/li>\n
  2. The setting of a ocean power plant is very difficult.<\/li>\n<\/ol>\n

    Question 3.
    \nWhat is geothermal energy ?
    \nAnswer:
    \nThe energy which is obtained due to geological changes is called geothermal energy.<\/p>\n

    Question 4.
    \nWhat are the advantages of nuclear energy ?
    \nAnswer:<\/p>\n