Two iron balls of radii r and 2r are heated to the same temperature. They are dropped in two different ice boxes A and B respectively. The mass of ice melted

Two iron balls of radii r and 2r are heated to the same temperature. They are dropped in two different ice boxes A and B respectively. The mass of ice melted

(a) will be same in the two boxes.

(b) in A will be twice than in B.

(c) in B will be twice than that in A.

(d) in B will be four times than that in A.

Ans: – Option (d).

 

An iron ball A of mass 2 kg at temperature 20°C is kept in contact with another iron ball B of mass 1.0 kg at 20°C. The heat energy will flow

(a) from A to B only

(b) from B to A only

(c) in neither direction

(d) Initially from A to B and then from B to A.

Ans: – Option (c).

 

When solid ice at 0°C is heated, its temperature

(a) rises (b) falls

(c) does not change until whole of it melts.

(d) first rises then falls back to 0°C.

Ans: – Option (c).

 

When steam at 100°C is heated its temperature

(a) does not change. (b) increases

(c) decreases (c) none of these.

Ans: – Option (b).

 

Specific heat of aluminium is almost two times the specific heat of copper. Equal amount of heat is given to two pieces of equal masses of copper and iron respectively. Rise in temperature of

(a) Copper will be equal to that of aluminium.

(b) Copper will be twice the rise in temperature of aluminium.

(c) Copper will be half the rise in temperature of aluminium.

(d) Copper will be four times the rise in temperature of aluminium.

Ans: – Option (b).

 

Equal heat is given to three pieces of copper A, B, and C having masses in the ratio 1:2:3. The rise in temperature will be in the order

(a) A > B > C (b) B > C > A

(c) C > B > A (d) A > C > B.

Ans: – option (a).

 

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