25) What happens when the height of a body from the ground is doubled?
26) What is the P.E of a body on the ground?
27) In the interior of the sun, which reaction takes place?
28) In the sun, which is converted in to energy?
29) In the core of the sun, hydrogen nuclei fuse together to form which nuclei?
30) What is called a device which reduces human effort?
31) What is called the rigid code that can rotate about a fixe point, fulcrum?
32) What is called the force overcome by a lever?
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