JAMB Physics Past Questions & Answers - Page 263

1,311.

Which of the following quantities are scalars?

i. Electrical potential
ii. Torque
iii. Momentum
iv. Kinetic energy

A.

ii and iii only

B.

i and ii only

C.

iii and iv only

D.

i and iv only

Correct answer is D

No explanation has been provided for this answer.

1,313.

A lorry travels 10km northwards, 4km eastwards, 6km southwards, 4km westwards to arrive at a point T. What is the total displacement?

A.

6km south

B.

4km north

C.

6km north

D.

4km east

Correct answer is B

No explanation has been provided for this answer.

1,314.

Which of the following are the correct SI units of the quantities indicated?

i.N(Force)
ii. N/m (Torque)
iii. watt(Power)
iv. kgms-2(Momentum)

A.

i and ii only

B.

i, ii and iii only

C.

i, ii, and iv only

D.

i and iii only

Correct answer is D

Quantities                          unit

Force                                  Newton

Torque                                  Newton-metre

Power                                     Watt

Momentum                            Kilogram-metre per secs

1,315.

Eight alpha decays and six beta decays are necessary before an atom of 2 \(^{238}_{92}U\) achieves stability. The final product in the chain has an atomic number of

A.

70

B.

78

C.

82

D.

90

Correct answer is C

U \(\to\) 8(\(^{4}_{2}He\)) + 6(\(^{0}_{-1}e\)) + \(^{b}_{a}X\)

92 = (8 X 2) + (6 X -1) + a

a = 82