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.

2,081.

Surface waves travelling in deep water at 15ms-1 are incident at a shallow water boundary. If the angles of incidence and refraction are 45o and 30o respectively. Calculate the speed of the waves in shallow water

A.

8.1ms-1

B.

10.0ms-1

C.

10.6ms-1

D.

22.5ms-1

Correct answer is C

n = \(\frac{\sin 45}{\sin 30} = 1.4142\)

n = \(\frac{15m/s}{x}\)

x = \(\frac{15}{1.4142}\) = 10.6m/s

2,082.

Humidity is used to describe the amount of

A.

air in water vapour

B.

cloud available in the atmosphere

C.

air in equal volume of cloud

D.

water vapour in the amosphere

Correct answer is D

No explanation has been provided for this answer.

2,083.

Which of the following physical qualities affects the saturated vapour pressure of a liquid?

A.

temperature

B.

volume

C.

mass

D.

density

Correct answer is A

No explanation has been provided for this answer.

2,084.

The amount of heat given out or absorbed when a substance changes its state at a constant temperature is known as

A.

latent heat

B.

heat capacity

C.

specific latent heat

D.

specific heat capacity

Correct answer is A

No explanation has been provided for this answer.

2,085.

The volume of an ideal gas at a pressure of 77cmHg and temperature 60oC is 24cm3. If the temperature and pressure are increased to 98oC
and 81cmhg respectively, calculate the new volume of the gas

A.

411.5cm3

B.

267.1cm3

C.

254.2cm3

D.

112.7cm3

Correct answer is C

V2 = \(\frac{P_1V_1T_2}{P_2T_1} = \frac{77 \times 240 \times 371}{81 \times 333}\)

= 254.2cm3