Here you get the CBSE Class 10 Science chapter 14, Sources of Energy: NCERT Exemplar Problems and Solutions (Part-II). This part of the chapter includes solutions for Question No. 16 to 22 from the NCERT Exemplar Problems for Class 10 Science Chapter: Sources of Energy. These questions include only the Short Answer Type Questions framed from various important topics in the chapter. Each question is provided with a detailed explanation.
NCERT Exemplar problems are a very good resource for preparing the critical questions like Higher Order Thinking Skill (HOTS) questions. All these questions are very important to prepare for CBSE Class 10 Science Board Examination 2017-2018 as well as other competitive exams.
Find below the NCERT Exemplar problems and their solutions for Class 10 Science Chapter, Sources of Energy:
Short Answer Type Questions
Question 16. Why is there a need to harness non-conventional sources of energy? Give two main reasons.
The two main reasons to harness non-conventional sources of energy are:
(i) The population of the world is increasing at a very rapid rate due to which demands for energy is increasing day by day.
As, fossil fuels like coal, petroleum, are present in a limited amount which and are likely to finish one day so the need for alternative sources of energy is essential.
(ii) Use of conventional sources of energy (coal, petroleum etc.) causes pollution. To reduce pollution use of non-conventional sources of energy is essential.
Question 17. Write two different ways of harnessing energy from ocean.
Two different ways of harnessing energy from ocean are:
Question 18. What steps would you suggest to minimize environmental pollution caused by burning of fossil fuels?
Environmental pollution caused by burning of fossil fuels can be minimized:
Question 19. What is the role of a plane mirror and a glass sheet in a solar cooker?
The plane mirror focuses the sun rays into solar cookers with which it achieve higher temperature.
The transparent glass sheet kept over the open end of cooker trap the incoming heat radiation (infrared rays) and does not allow them to escape to the surroundings in other words glass sheet act as green house effect.
Question 20. Mention three advantages of a solar cell.
Three advantages of a solar cell are:
(i) Solar cell does not produce any sort of pollution.
(ii) Solar cell does not require any running costs as it uses sunlight for production of electricity.
(iii) Solar cell do not have any moving parts hence, making its maintenance cost to be negligible.
Question 21. What is bio-mass? What can be done to obtain bio-energy using biomass?
Biomass refers to those living and non-living organic materials that can be used as sources of energy in the form of fuel. Some examples of biomass fuels are biogas, wood, crops, and organic garbage. The chemical energy in biomass is released as heat on burning.
Bio-energy can be obtained from biomass by following ways:
Question 22. What are the limitations in obtaining energy from wind?
Limitations in obtaining energy from wind are as follows
NCERT Exemplar Problems & Solutions for CBSE Class 10 Science: All chapters
NCERT Exemplar Solution for CBSE Class 10 Science Chapter: Acids, Bases and Salts (Part-III)
NCERT Exemplar Solution for CBSE Class 10 Science: Chemical Reactions and Equations (Part-III)
NCERT Exemplar Solution for CBSE Class 10 Science Chapter:Management of Natural Resources (Part-III)