Question 811:

• JAMB 1995

Which of the following statements are TRUE about frictional force? i. it is always a disadvantage ii. it is sometimes a disadvantage iii. it always exist where there is a relative motion of two bodies that are in contact iv. it is sometimes very useful

A. I, iii only
B. I, iv only
C. Ii, iii only
D. Iii, iv only

Question 812:

• JAMB 1995

The energy contained in a wire when it extended by 0.02m by a force 500 N is

A. 5J
B. 10J
C. 10³J
D. 10⁴

Question 813:

• JAMB 1995

A hydraulic press has a large circular piston of radius 0.8m and a circular plunger of radius 0.2m. A force of 500N is exerted by the plunger. Find the force exerted on the piston

A. 8000N
B. 4000N
C. 2000N
D. 31N

Question 814:

• JAMB 1995

The volume of an air bubble increases from the bottom to the top of a lake at constant temperature because

A. Atmospheric pressure acts on the surface of the lake
B. Pressure increases with depth
C. Density remains constant with pressure
D. The bubble experiences an upthrust

Question 815:

• JAMB 1995

Temperature is the measure of the

A. Quantity of heat transferred into the molecules of an object
B. Mean kinetic energy of the molecules of the object
C. Kinetic energy of any individual molecule of the substance
D. Amount of work done by the molecules of the object