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.

3,496.

A gas which obeys Charles’ law exactly has a volume of 283cm3 at 10oC. What is its volume at 30oC?

A.

142cm3

B.

293cm3

C.

303cm3

D.

566cm3

E.

849cm3

View answer & explanation

Correct answer is C

Using Charles law:

V1/T1 = V2/T2;

(283 * 303) / 283 

V2= 303

3,497.

Which of the following colours of surfaces will radiate heat energy best?

A.

Red

B.

White

C.

Black

D.

Yellow

E.

Blue

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

3,498.

A given mass of gas at a temperature of 30°C is trapped in a tube of volume V. Calculate the temperature of the gas when the volume is reduced to two-third of its original value by applying a pressure twice the original value.

A.

71oC

B.

40oC

C.

131oC

D.

313oC

E.

404oC

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

3,499.

Which of the following statements is/are correct?

I. Pure water freezes at 0oC under normal pressure
II. Water has its highest density at 4oC.
III. The volume at 4oC,

A.

I only

B.

II only

C.

I and II only

D.

I and III only

E.

II and III only

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

3,500.

Steel bars, each of length 3.0 m at 28°C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10-5°C, what is the safety gap that must be left between successive bars if the highest temperature expected is 40oC?

A.

1.2 x 10-1cm

B.

8.4 x 10-2cm

C.

7.2 x10-2cm

D.

3.6 x 10-2cm

E.

1.8 x 10-2cm

View answer & explanation

Correct answer is D

Gap ΔL = αL1Δθ = 1.0 x 10-5 x 3 x (40 - 28)
= 3.6 x 10-2


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