Question 776:

• JAMB 1994

If a room is saturated with water vapour, the temperature of the room must be

A. At 0^oC
B. Above the dew point
C. At 100^oC
D. Below or at the dew point

Question 777:

• JAMB 1994

Two similar kettles containing equal masses of boiling water are placed on a table. If the surface of one is highly polished and the surface of the other is covered with soot, Which of the following observations is correct

A. The two kettles will cool down at the same rate
B. The polished kettle cools down more quickly by conduction
C. The kettle covered with soot cools down more quickly because it is a good radiator
D. The kettle covered with soot cools down more quickly by the process of heat convection

Question 778:

• JAMB 1994

The equation of transverse wave traveling along a string is given by Y = 0.3 sin(0.5x - 50t) where Y and X are in cm and t is in seconds.Find the maximum displacement of the particles from the equilibrium position

A. 50.0cm
B. 2.5 cm
C. 0.5cm
D. 0.3cm

Question 779:

• JAMB 1994

The sound from a source travelled to the bottom of the sea and the echo was heard 4s later. If the speed of sound in sea water is 1500ms^-1 the depth of the sea is

A. 6000m
B. 3000m
C. 1500m
D. 375m

Question 780:

• JAMB 1994

The fundamental frequency of vibration of a sonometer wire may be halved by

A. Doubling the length of the wire
B. Doubling the mass of the wire
C. Reducing the tension by half
D. Reducing the absolute temperature by half