WAEC Physics Past Questions & Answers - Page 249

1,241.

A net force of magnitude 0.6N acts on a body of mass 40g, initially at rest. Calculate the magnitude of tire resulting acceleration.

A.

90ms^-2

B.

60ms^-2

C.

30ms^-2

D.

15ms^-2.

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,242.

The force between molecules of the same substance is termed

A.

elastic force

B.

repulsive force

C.

cohesive force

D.

adhesive force

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,243.

The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days, what would be the count rate per minute after 15 days?

A.

20

B.

25

C.

50

D.

200

E.

400

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,244.

Which of the following particles/rays do not originate from the nucleus of an atom?

A.

Alpha particles

B.

Beta particles

C.

Neutrons

D.

Gamma rays

E.

X-rays

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

1,245.

Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?

A.

Carbondioxide gas

B.

Liquid sodium metal

C.

Concrete shield

D.

Graphite rods

E.

Boron rods

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

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