The stone of a hand flour grinder is provided with a handle near its rim. Give reason.

Water near the bed of a deep river is quiet while that near the surface flows. Give reasons.

(a) What is nuclear fusion ? Give one example and write its nuclear reaction. (b) What other name is given to nuclear fusion ? Give reason.

If a stone and a pencil are dropped simultaneously in vacuum from the top of a tower, then which of the two will reach the ground first? Give reason.

If a stone and a pencil are dropped simultaneously in vacuum from the top of a tower, which of the two will reach the ground first ? Give reason.

A rational number in its decimal expansion is 327.7081. What can you say about the prime factors of q, when this number is expressed in the from (p)/(q) ? Give reason

A rational number in its decimal expansion is 327.7081 . What can you say about the prime factors of q , when this number is expressed in the from (p)/(q) ? Give reason.

A rational number in its decimal expansion is 327.7081. What can you say about the prime factors of q, when this number is expressed in the from (p)/(q) ? Give reason

(a) What are magnetic field lines ? How is the direction of magnetic field at a point in a magnetic field determined using field lines ? (b) Two circular coils X and Y are placed close to each other. IF the current in the coil X is changed, will some current be induced in the coil Y ? Give reason. (C) State " Fleming's right hand rule .

The emf of a cell is always greater than its terminal voltage. Why? Give reason.