Question 531:

• JAMB 1989

A block-and-tackle system is used to lift a load of 20N through a vertical height of 10m. if the efficiency of the system is 40%, how much work is done against friction?

A. 80J
B. 120J
C. 300J
D. 500J

Question 532:

• JAMB 1989

Which of the following devices are used to measure pressure? i. Aneroid barometer. ii. hydrometer. iii. hygrometer. iv. manometer.

A. I and iii
B. Ii and iii
C. Iii and iv
D. I and iv

Question 533:

• JAMB 1989

A piece of wood of mass 40g and uniform cross-sectional area of 2cm² floats upright in water. The length of the wood immersed is

A. 30cm
B. 40cm
C. 20cm
D. 2cm

Question 534:

• JAMB 1989

The pressure on the gas of constant gas thermometer at the ice point is 325mm of mercury and at the steam point is 875mm of mercury. Find the temperature when the pressure of the gas is 190mm of mercury

A. 30k
B. 243k
C. 300k
D. 3003k

Question 535:

• JAMB 1989

A column of air 10.0cm long is trapped in a tube at 27^oC. What is the length of the volume at 100^oC?

A. 12.4cm
B. 13.7cm
C. 18.5cm
D. 37.0cm