A science teacher gave a project to his students to design and prepare a solar cooker by using low cost materials available. The materials used by students were probably thermocol, glass plate, black paper and mirror etc. They also prepared a report about the device. Answer the following questions:

(i) Name the property of solar energy by which solar cooker achieves high temperature.

(ii) Write the role of thermocol and mirror used in constructing the solar cooker.

Important Questions on Sources of Energy

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 5 - Sources of Energy>Assignment-3>Q 15

(i) Why are solar heating devices painted black?

(ii) Name two such devices and state two limitations of these?

MEDIUM

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 5 - Sources of Energy>Assignment-3>Q 16

Mention why it is not possible to make use of solar cells to meet all our energy needs? State three reasons to support your answer. Also mention three uses of solar cell.

MEDIUM

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 5 - Sources of Energy>Assignment-3>Q 17

Draw a labelled diagram of a solar cooker. What purpose are served by the blackened surface, glass cover plate and the mirror in a solar cooker? What would happen if the plane mirror of a solar cooker is replaced by a concave glass mirror?

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 5 - Sources of Energy>Assignment-4>Q 1

Name the energy obtained from sea or ocean water due to difference in temperature at the surface and in deeper section of these water bodies.
(Choose from: Ocean thermal energy, Ocean energy, Thermal energy)

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 5 - Sources of Energy>Assignment-4>Q 2

What type of energy possessed by huge waves near the sea-shore?

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 5 - Sources of Energy>Assignment-4>Q 3

Write two different ways of harnessing energy from ocean.

EASY

10th CBSE