choose the correct answer from a b c or d

A.Complete:

1.Increasing electric load causes .......................

Answer:Electric fires

2.Lunar eclipse occurs when the ........... comes between the ............ and the ................

Answer:earth,sun,moon

B.Give reasons for :

The second class lever conserve effort.

Answer:Because the force arm is always longer than resistance arm.

lever have fulcrum between effort force and resistance force...........

     a-first class lever                 b-second class lever

      c-third class lever                d-fourth class lever

(answer a-first class lever)

............ the lever rotates around a fixed point called

A_            resistance force                     B_  fulcrum


C_         effort force                               D_         a rigid bar


(the answer is  B_ FULCRUM)