Question 681:

• JAMB 1992

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

A. Increase
B. Remain the same
C. Decrease
D. First decrease and then increase

Question 682:

• JAMB 1992

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

A. Convection
B. Radiation from the surface
C. Conduction through the stopper and the glass
D. Conduction across the walls

Question 683:

• JAMB 1992

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?

A. 4000ms^-1
B. 400ms^-1
C. 250ms^-1
D. 40ms^-1

Question 684:

• JAMB 1992

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

A. Diffraction
B. Interference
C. Refraction
D. Reflection

Question 685:

• JAMB 1992

A note is the octave of another note if it has

A. A frequency twice that of the first note
B. Frequency half that of the first note
C. The same fundamental frequency as the first one
D. A frequency frequency eight times that of the first note