NECO Physics Past Questions & Answers - Page 6

26.

Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then

A.

A and B are equal

B.

A is greater than B

C.

the angle between A and B is 0°

D.

the angle between A and B is 90°

E.

the angle between A and B is 180°

Correct answer is E

No explanation has been provided for this answer.

27.

Arrange the following in the order of their increasing frequency.

I. Visible light
II. Gamma rays
III. Radio waves
IV. Infra-red radiation
V. Ultra-violet radiation

A.

I, II, III, IV, V

B.

II, III, IV, V, I

C.

III, IV, V, I, II

D.

IV, III, I. V, II

E.

III, IV, I,V, II

Correct answer is E

No explanation has been provided for this answer.

28.

Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V.

A.

0.02 J

B.

0.10 J

C.

0.20 J

D.

1.00 J

E.

10.00 J

Correct answer is E

No explanation has been provided for this answer.

29.

The phenomenon of photoelectric effect is used in the following EXCEPT

A.

automatic doors

B.

bugler alarm

C.

electric fire alarm

D.

sound production from film tracks

E.

television cameras

Correct answer is D

No explanation has been provided for this answer.

30.

An effort P applied at one end of a crowbar just overcomes the resistance W at the lid of a tin. The mechanical advantage of the crowbar is expressed as

A.

W + P

B.

P - W

C.

\(\frac{w}{p}\)

D.

\(\frac{p}{w}\)

E.

wp

Correct answer is C

No explanation has been provided for this answer.