Question 306:

• JAMB 1984

Dewpoint is the temperature at which, water vapour in the atmosphere

A. Turns into steam
B. Solidifies into ice pellets
C. First condenses into liquid form
D. Is just sufficient to cause cooling
E. Has a relative humidity of fifty percent

Question 307:

• JAMB 1984

The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?

A. 55.3^oC
B. 23.3^oC
C. 49.0^oC
D. 16.1^oC
E. 76.7^oC

Question 308:

• JAMB 1984

If a solid changes directly into a gas when heat is applied the process is called

A. Vaporization
B. Evaporation
C. Sublimation
D. Ionization
E. Conversion

Question 309:

• JAMB 1984

A plane inclined at an angle of 30^o to the horizontal has an efficiency of 60%. The force parallel to the plane required to push a load of 120N uniformly up the plane is

A. 60N
B. 100N
C. 120N
D. 200N
E. 240N

Question 310:

• JAMB 1984

A body of mass 5kg initially at rest is acted upon by two mutually perpendicular forces 12N and 5N as shown in fig.3. If the particle moves in the direction QA, calculate the magnitude of the acceleration

A. 0.40ms^-2
B. 1.40ms^-2
C. 0.26ms^-2
D. 2.60ms^-2
E. 3.40ms^-2