WAEC Past Questions and Answers - Page 3600

17,996.
17,997.

The intensity of light falling on the film in a camera depend on the

i. brightness of the object.
ii. diameter of the aperture stop.
iii. speed of the shutter.

Which of the statements is/are correct?

A.

i, ii and iii

B.

i and ii only

C.

i and ii only

D.

ii and iii only

E.

iii only

Correct answer is E

No explanation has been provided for this answer.

17,998.

In which of the underlisted blood groupings is agglutination likely to occur during transfusion?

A.

I

B.

II

C.

III

D.

IV

E.

V

Correct answer is D

No explanation has been provided for this answer.

17,999.

Which gas will pass into the test tube labelled II from I?

A.

Carbon monoxide

B.

Carbon dioxide

C.

Oxygen

D.

Ammonia

E.

Nitrogen

Correct answer is B

No explanation has been provided for this answer.

17,000.

A lantern gives an image of 3m square of a slide 7.62cm square on a screen. If the screen is 10m from the projection lens of the lantern, calculate the focal length of the lens

A.

40.3cm

B.

26.1cm

C.

24.8cm

D.

0.7cm

E.

0.3cm

Correct answer is C

M = \(\frac{V_H}{U_H} = \frac{300}{7.62}\)

= 39.3

U = \(\frac{V}{M} = \frac{1000}{39.3}\) = 25.44

\(\frac{1}{f} = \frac{I}{U} + \frac{I}{V} = \frac{I}{25.44} = \frac{I}{1000} = \frac{1025.44}{25440}\)

f = \(\frac{25440}{1025.44} = 24.8\)