Physics 2012 Jamb Past Questions and Answers

Question 41 :

• JAMB 2012

The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?

A. 20N
B. 30N
C. 40N
D. 50N

Question 42 :

• JAMB 2012

At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that

A. P₁ > P₂
B. P₁ ≥ P₂
C. P₁ < P₂
D. P₁ = P₂

Question 43 :

• JAMB 2012

If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is

A. Doubled
B. Reduced to a quarter
C. Reduced by half
D. Constant

Question 44 :

• JAMB 2012

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is

A. 4.0 x 10²N
B. 2.0 x 10³N
C. 4.0 x 10³N
D. 4.0 x 10⁴N

Question 45 :

• JAMB 2012

A stream is flowing at 0.75ms\(^{-1}\) and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.

A. 1.50ms^-1
B. 1.00ms^-1
C. 0.86ms^-1
D. 0.65ms^-1