Question Text
Question 1 :
Name a gas which is used in refrigeration and in fire extinguisher?
Question 6 :
Suggest one word for the following statement/ definition:
The physical and biological world where we live in
Question 7 :
State TRUE or FALSE: Food web consists of a number of interlinked food chains.
Question 11 :
The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
Question 12 :
The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to
Question 15 :
State TRUE or FALSE : Stars twinkle but not planets because planets are closer to earth and are seen as extended sources
Question 16 :
In order to make efficient solar cooker, the cover of cooker box should be made of:
Question 17 :
Mention the purpose of blackening the interior of a solar cooker.
Question 20 :
The power plant which converts potential energy of falling water into electricity is