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.

2,291.

The latent heat of fusion of ice is 80cal g-1. How much heat is required to change 10g of ice at QoC into water at the same temperature?

A.

80 cal

B.

10 cal

C.

8 cal

D.

800 cal

E.

400 cal

Correct answer is D

Quantity of heat = ml

= 10 x 80

= 800 cal

2,292.

A temperature 20°C is the same as

A.

36oF

B.

68oF

C.

11.1oF

D.

43.1oF

E.

25oF

Correct answer is B

212°F ... 100°C

\(\theta\)°F ... 20°C

32°F ... 0°C

\(\frac{\theta - 32}{212 - 32}\) = \(\frac{20 - 0}{100 - 0}\)

180 = 5(\(\theta\) - 32)

5\(\theta\) = 180 + 160 = 340

\(\theta\) = 68°F

2,293.

A few grains of table salt were put in a cup of water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. The action is due to

A.

convection

B.

osmosis

C.

capillarity

D.

diffusion

E.

conductivity

Correct answer is D

No explanation has been provided for this answer.

2,295.

A solid suspended by a piece of string is completely immersed in water. On attempting to lift the solid out of the water, the string breaks when the solid is partly out of the water. This is because

A.

the tension in the string decreases as the solid is lifted

B.

the mass of the solid has increased

C.

the solid apparently weighs less when completely immersed in water than when partially immersed

D.

part of the solid still in water is exerting more force on the string

E.

the solid is no longer in equilibrium with water

Correct answer is C

No explanation has been provided for this answer.