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JAMB Physics Past Questions & Answers - Page 189

941.

The heights of the mercury thread in a mercury-in-glass thermometer when in melting ice and then in steam are 3cm and 18cm respectively. At a temperature of 60^oC the height would be

7.5cm

9cm

10.8cm

12cm

12.6cm

View answer & explanation

Correct answer is D

18cm .... 100^oC

x .... 60^oC

3cm .... 0^oC

$\frac{x - 3}{18 - 3}$ = $\frac{60 - 0}{100 - 0}$

= 12cm

942.

If the wavelength of a wave traveling with a velocity of 360ms^-1 is 60m, the period of the wave is

3.6s

0.17s

0.61s

View answer & explanation

Correct answer is C

V = $\alpha$ F and F = $\frac{1}{T}$

v = $\frac{\pi}{T}$

T = $\frac{60}{360}$

T = 0.17s

943.

When the vapour of a substance is in equilibrium with its own liquid, it is said to be

gaseous

unsaturated

liquefied

diffused

saturated

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

944.

In what range of temperature is the expansion of water anomalous?

+208^oC to +212^oC

-80^oC + -76^oC

-4^oC to 0^oC

+96^oC to +100^oC

0^oC to +4^oC

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

945.

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of

$\frac{\pi}{2}$

$\frac{1}{4}$

2 $\pi$

View answer & explanation

Correct answer is E

In simple pendulum, T = 2 $\pi$ $\sqrt\frac{L}{g}$

$\frac{T_2}{T_1}$ = $\sqrt\frac{L_1}{L_2}$ but, L₂ = 4L₁

$\frac{T_2}{T_1}$ = $\sqrt\frac{L_1}{4L_1}$

T₂ = 4T₁

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