WAEC Physics Past Questions & Answers - Page 291

1,451.

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.

1,452.

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.

1,453.

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.

1,454.

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

1,455.

A body of mass 5kg falls from a height of 10m above the ground. What is the kinetic energy of the body just before it strikes the ground? (Neglect energy losses and take gravity as 10ms^2)

A.

5J

B.

25J

C.

250J

D.

500J

E.

625J

View answer & explanation

Correct answer is D

v2 = u2 + 2gh = 0 + 2 x 10 x 10
v2 = 200; K.E = 1/2m
v2 = 1/2 x 5 x 200 = 500J


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