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JAMB Physics Past Questions & Answers - Page 255

1,271.

Which of the following media allow the transmission of sound wave through them

i. Air.
ii. Liquids.
iii. Solids.

A.

i and ii only

B.

i and iii only

C.

ii and iii only

D.

i,ii and iii

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,272.

When heat is applied to one end of a metal rod, the molecules at the other end soon begin to vibrate with greater amplitude than before because heat has been transferred by

A.

radiation

B.

convection

C.

conduction

D.

evaporation

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,273.

A tap supplies water at 25^oC while another supplies water at 75^oC. If a man wishes to bathe with water at 40^oC, the ratio of the mass of cold water to the mass of hot water required is

A.

1 : 3

B.

15 : 8

C.

7 : 3

D.

3 : 1

View answer & explanation

Correct answer is C

Heat lost = heat gained

m_h x c x (75 - 40) = m_c x c x (40 - 25)

$\frac{m_h}{m_c}$ = $\frac{35}{15}$

= $\frac{7}{3}$

1,274.

The amount of heat needed to raise the temperature of 10kg of copper by 1k is its

A.

specific heat capacity

B.

heat capacity

C.

latent heat

D.

internal energy

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,275.

The product PV where P is pressure and V is volume has the same unit as

A.

force

B.

power

C.

energy

D.

accelaration

View answer & explanation

Correct answer is C

PV = $\frac{N}{m^2}$ x $\frac{m^3}{1}$

= Nm

= Force x distance = work done = energy

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