JAMB Physics Past Questions & Answers - Page 124

616.

Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is

A.

2√3/3N

B.

√2N

C.

4√3/3

D.

2V3N

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

617.

What is the reading of the vernier scale above

A.

1.88cm

B.

1.80cm

C.

1.28cm

D.

1.97cm

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

618.

A beam of radiation is passed between a pair of charged plates as indicated in the fig above. Beam P is undetected While Q is deflected to the left. P and Q respectively should be

I.γ-rays β-rays
II. x-rays β-rays
III. γ-rays x-rays
IV. x-rays x-rays

A.

I only

B.

III only

C.

I and II

D.

III and IV

View answer & explanation

Correct answer is C

studying the charges of the Gamma, Alpha, Beta and X-rays, you find that both the x-rays and theGamma rays possess zero-charge hence they could pass the charged plate undetected while the beta rays are negatively charged hence will deflect towards the positive charge of the plate. Alpha rays, on the other hand, are poisitively charged hence, they deflect towards the negative charge. 

619.

The fig above shows a conductor PQ carrying a current I in the direction shown. At a particular position near the conductor is a compass needle K. Neglecting the earth's magnetic field, the compass needle will

A.

settle in any direction

B.

settle in a fixed direction only if the conductor PQ is a magnetic material

C.

settle in a fixed direction WHETHER the conductor PQ is a magnetic material OR NOT

D.

be stationary

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

620.

The total power drawn from the cell in the circuit above is

A.

12W

B.

24W

C.

32W

D.

40W

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.


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