Jamb Physics 1998 Past Questions and Answers

Question 11:

• JAMB 1998

A parachute attains a terminal velocity when

A. Its density is equal to the density of air
B. The viscous force of the air and the upthrust completely counteract its weight
C. It expands as a result of reduced external pressure
D. The viscous force of the air is equal to the sum of the weight and upthrust

Question 12:

• JAMB 1998

In a wheel and axle mechanism the diameters of the wheel and axle are 40cm and 8cm respectively. Given that the machine is 80% efficient, what effort is required to lift a load of 100N?

A. 20N
B. 25N
C. 50N
D. 80N

Question 13:

• JAMB 1998

The tendon in a man's leg is 0.01m long. If a force of 5N stretches the tendon by 2.0 x 10^-5m, calculate the strain on the muscle.

A. 5 x 10⁶
B. 5 x 10²
C. 2 x 10^-3
D. 2 x 10^-7

Question 14:

• JAMB 1998

Which of these statements are correct for the pressures in liquids? i. pressure in a liquid at a point acts equally in all directions. ii. pressure increases with depth. iii. pressure at a depth depends on the shape of the container. iv. pressure at the same depth in different liquids are proportional to the density at different liquids.

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

Question 15:

• JAMB 1998

The atmospheric pressure due to water is 1.3 x 10⁶Nm^-2. What is the total pressure at the bottom of an ocean 10m deep? [Density of water = 1000kgm^-3, g = 10ms^-2]

A. 1.3 x 10⁷Nm^-2
B. 1.4 x 10⁶Nm^-2
C. 1.4 x 10⁵Nm^-2
D. 1.0 x 10 ⁵Nm^-2