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JAMB Physics Past Questions & Answers - Page 40

196.

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

+208 $^o$ C to +212 $^o$ C

-80 $^o$ C + -76 $^o$ C

0 $^o$ C to +4 $^o$ C

-4 $^o$ C to +0 $^o$ C

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

197.

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?

$\frac{\pi}{2}$

$\frac{1}{4}$

View answer & explanation

Correct answer is D

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

$\frac{T_1}{T_2} = \sqrt{\frac{L_1}{L_2}}$ but L $_2$ = 4L $_1$

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

T $_2$ = 2T $_1$

198.

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms $^{-1}$ . The recoil speed of the machine gun is

0.5 ms $^{-1}$

1.5 ms $^{-1}$

1 ms $^{-1}$

2ms $^-1$

View answer & explanation

Correct answer is C

Gun Momentum = bullet momentum

M $_a$ V $_a$ = M $_b$ V $_b$

5 x V $_a$ = 0.05 x 100

V $_a$ = 1m $^{-1}$

199.

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

$\frac{mv^2}{r}$

$\frac{mr^2}{x}$

$\frac{mr}{v}$

$\frac{mv}{r^2}$

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

200.

A few grains of table salt were put in a cup of cold water, kept at constant temperature and left undistributed. Eventually all the water tested salty. This action is due to?

convection

osmosis

capillarity

diffusion

View answer & explanation

Correct answer is D

Diffusion is the tendency of molecules to migrate and fill an empty space due to their random thermal motions.

in diffusion, the diffusing molecules move from the places where their concentration high to places where their concentration is low.

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