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JAMB Physics Past Questions & Answers - Page 184

916.

Radio carrier waves are generated by causing electrons to oscillate rapidly in

A.

a microphone

B.

a television camera

C.

an antenna

D.

coaxial cables

E.

a transmitter

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

917.

A weight of 1000 grams hangs from a lever 20cm to the fulcrum. At the left is a 500-gram weight 20cm from the fulcrum, and a 200-gram weight x cm away from the fulcrum. What is the value of x that will make the lever balanced?

A.

50cm

B.

20cm

C.

10cm

D.

30cm

E.

70cm

View answer & explanation

Correct answer is D

Taking moment about F,

200(X + 20) + (500 x 20) = (1000 x 20)

200X + 4000 + 10000 = 20000

200X + 14000 = 20000

200X = 20000 - 14000

200X = 6000

X = 30cm

918.

It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus?

A.

an electron

B.

a $\beta$ -particle

C.

an $\alpha$ -particle

D.

a proton

E.

an atom

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

919.

A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is?

A.

a little above half of its initial energy

B.

a little below half of its initial energy

C.

a half of its initial energy

D.

a little above its initial energy

E.

a little below its initial energy

View answer & explanation

Correct answer is C

Energy for complete distance is twice the energy for half the distance

920.

On which of the following is the operation of a moving coil galvanometer based?

A.

Magnetic effect of electric current

B.

Electromagnetic induction

C.

Chemical reaction produced by electricity

D.

Force on current carrying conductor in a magnetic field

E.

Electrical energy and power

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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