WAEC Physics Past Questions & Answers - Page 316

1,576.

An object is placed 36cm from a converging lens of focal length 24cm.If a real image which is 4cm high is formed, Calculate the height of the object.

A.

2.0cm

B.

4.0cm

C.

6.0cm

D.

8.0cm

E.

10.0cm

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,577.

The velocities of light in air and glass are 3.0 x10\(^8\)ms\(^{-1}\) and 1.8 \(\times \)10\(^8\) ms\(^{-1}\) respectively. Calculate the sine of the angle of incidence that will produce an angle of refraction of 30° for a ray of light incident on glass.

A.

1.2

B.

1.0

C.

0.8

D.

0.6

E.

0.3

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,578.

A transparent rectangular block 5.0cm thick is placed on a black dot. The dot when viewed from above is seem 3.0cm from the top of the block calculate the refractive index of the material of the block.

A.

2/5

B.

3/5

C.

3/2

D.

5/3

E.

5/2

View answer & explanation

Correct answer is B

refractive index = real depth ÷ apparent depth

→ 3 ÷ 5

n = 3/5

1,579.

Which of the following statements is/are not correct about image formed by a plane mirror?
I. The magnification produced is 1
II. The image distance is same as the object distance
III. The image is real
IV. The image is laterally inverted

A.

I only

B.

II only

C.

III only

D.

I & II only

E.

II & IV only

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,580.

Which of the following will affect the saturation vapour pressure of a liquid?

A.

Temperature of the liquid

B.

Humidity of air

C.

Volume of vapour

D.

Volume of the liquid

E.

mass of the liquid

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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