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JAMB Physics Past Questions & Answers - Page 286

1,426.

Which of the following characteristics of a wave is used in the measurement of the depth of the sea?

diffraction

interference

refraction

reflection

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,427.

The equation of a wave is y = 0.005 sin[x(0.5X - 200t)] where x and y are in meters and t is in seconds. What is the velocity of the wave?

4000ms^-1

400ms^-1

250ms^-1

40ms^-1

View answer & explanation

Correct answer is B

y = 0.005 sin[x(0.5X - 200t)]

compare to Y = A sin(kx - wt)

$\lambda$ = $\frac{2\pi}{k}$ and F = $\frac{w}{2\pi}$

V= $\lambda$ F

= $\frac{2\pi}{0.5}$ x $\frac{200}{2\pi}$

= 400ms^-1

1,428.

The space between the double glass walls of a thermos flask is evacuated space are silvered. The residual source of heat loss takes place by

convection

radiation from the surface

conduction through the stopper and the glass

conduction across the walls

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,429.

A block of ice floats on water inside a container. If the block of ice gets completely melted, the level of water in the container will

increase

remain the same

decrease

first decrease and then increase

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,430.

How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg^-1K^-1 is heated from 20^oC to 70^oC?

39 . 98 x 10^-1J

9.75 x 10²J

3.98 x 10³J

9.75 x 10³J

View answer & explanation

Correct answer is B

Q = mc $\theta$

= 0.05 x 390 x (70 - 20)

= 975J

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