JAMB Physics Past Questions & Answers - Page 187

931.

Which of the following is the correct definition of 'half-life'?

A.

the average life-time of a radioactive material

B.

the time it takes a radioactive material to decay to half of its original quantity

C.

half the period a radioactive material decays completely

D.

half of the decay constant

E.

the decay constant times life-time

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

932.

An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?

A.

5 volts

B.

3.5 volts

C.

2.5 volts

D.

1 volts

E.

10 volts

View answer & explanation

Correct answer is B

E.m.f. = I(R + r) = 0.5(2+5) = 3.5 volts

933.

Which of the following statements is correct? The magnetized state of an iron bar can be destroyed completely by

A.

heating the bar to a high temperature

B.

breaking the bar

C.

connecting opposite poles with a small piece of iron

D.

placing the bar inside a strong magnetic field

E.

none of the above

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

934.

What are the units of thermal conductivity?

A.

kg.m.sec2

B.

Joule sec-1m-1k-1

C.

kg.m

D.

Newton sec-1m2

E.

m3

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

935.

Which of the following statements is correct? The reading of pressure on a mercury barometer is independent of

A.

the cross-sectional area of the tube

B.

the atmospheric pressure

C.

the density of mercury

D.

the temperature of mercury

E.

the acceleration due to gravity

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.


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