Post Utme Physics Past Questions and Answers

Question 286:

A \(20 \mathrm{~kg}\) mass is to be pulled up in a slope inclined at \(30^{\circ}\) to the horizontal. if the efficiency of the plane is \(75 \%\), the force required to pull, the load, up the plane is.... \(\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)\).

A. 13.3N
B. 73.5 N
C. 133.3 N
D. 533.2N

Question 287:

If a room is saturated with water vapour, the temperature of the room must be ____________

A. At \(0^{\circ} \mathrm{C}\)
B. Above the dew point
C. At \(100^{\circ} \mathrm{C}\)
D. Below or at the dew point

Question 288:

The refractive index of a liquid is 105 . If the velocity of light in vacuum is \(3.0 \times 10^{8} \mathrm{~ms}^{-1}\), the velocity of light in the liquid is ____________

A. \(1.5 \times 10^{8} \mathrm{~ms}^{-1}\)
B. \(2.0 \times 10^{8} \mathrm{~ms}^{-1}\)
C. \(3.0 \times 10^{8} \mathrm{~ms}^{-1}\)
D. \(4.5 \times 10^{8} \mathrm{~ms}^{-1}\)
E. \(9.0 \times 10^{8} \mathrm{~ms}^{-1}\)

Question 289:

Which of the following quantities are scalars?

I. Electrical potential
II. Torque
III. Momentum
IV Kinetic energy

A. II and III only
B. II and II only
C. III and IV only
D. I and IV only

Question 290:

A block of ice floats on water inside a container. If the block of ice gets completely melted, the level of water in the container will ____________

A. Increase
B. Remain the same
C. Decrease
D. First decrease and then increase