JAMB Physics Past Questions & Answers - Page 96

476.

Which of the following radiations constitutes a stream of electrons?

A.

Gamma rays

B.

X-rays

C.

Cathode rays

D.

Radio waves

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

477.

Which of the following statements about diode is correct?

A.

reverse bias diodes have low resistance

B.

forward bias diodes have high resistance

C.

forward bias diodes produce high current

D.

forward bias diodes function as a result of heat

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

478.

in a nuclear fission process, the mass defect was 1.2 x 10^-5kg. Calculate the energy released. [speed of the light in vacuum = c = 3.0 x 10⁸ms^-1]

A.

1.08 x 10¹¹J

B.

5.20 x 10¹¹J

C.

1.08 x 10¹²J

D.

2.50 x 10¹³J

View answer & explanation

Correct answer is C

E - Mec²

E = 1.2 x 10^-5 x (3 x 10⁸)²

E = 1.08 x 10¹²J

479.

When current flows through a moving-coil galvanometer, the force exerted on the pointer depends on the: i. strength of the current. ii. magnetic field strength. iii. length of the coil. Which of the statement(s) above is/are correct?

A.

i only

B.

ii only

C.

i and iii only

D.

i, ii and iii

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

480.

What must be connected between the points P and Q to establish a steady current through the incomplete circuit diagram given?

A.

Fuse

B.

ammeter

C.

Cell

D.

voltmeter

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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