Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

3,551.

How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?

A.

1.38 x 106 J

B.

2.53x104J

C.

7.66x103J

D.

1.38x103J

E.

1.27 X103J

Correct answer is D

Q = mcΔθ = 0.050 x 460 x (85 - 25) = 1.38x103J

3,552.

lf the temperature of a small quantity of water in a closed container is gradually increased from 0o to 40oC then the density of the water within this range

A.

increases for a while and then decreases

B.

decreases for a while and then increases

C.

increases gradually

D.

decreases gradually

E.

remains the same

Correct answer is A

No explanation has been provided for this answer.

3,553.

Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise higher than that of Y only if the

A.

volume of P is greater than that of Q

B.

specific heat capacity of P is higher than that of Q

C.

density of P is greater than that of Q

D.

density of P is lower than that of Q

E.

specitic heat capacity of P is lower than that of Q.

Correct answer is B

No explanation has been provided for this answer.