Post Utme Physics Past Questions and Answers

Question 1196:

A \(300 g\) body moving with a speed of \(6 m / s\) collides headon with a \(900 g\) body which was initially at rest. If the collision was elastic, what is the final velocity of the \(300 g\) mass?

A. -3 m / s
B. 3 m / s
C. 5 m / s
D. -5 m / s

Question 1197:

A \(5 kg\) uniform plank is balanced horizontally on a support by two weights attached to its ends. The plank is \(2 m\) long and the support is placed at \(0.5 m\) from one end. If the mass near the support is \(10 kg\), what mass must be placed at the other end?

A. 10 kg
B. 20 kg
C. 5 kg
D. 15 kg

Question 1198:

\(A 50 g\) ice at \(-10^{\circ} C\) gradually tums to water at \(25^{\circ} C\). How much heat is consumed in the process? Given that the specific heat capacity of ice \(=2100 Jkg ^{-1} k ^{-1}\) and latent heat of fusion of ice \(=3.34 \times 10^{5} Jkg ^{-1}\), specific heat capacity of water \(=4200 Jkg ^{-1} \)

A. \(20 kJ\)
B. \(33 kJ\)
C. \(23 kJ\)
D. \(28 kJ\)

Question 1199:

A car travels due west for 10 minutes at \(50 km / hr\) and then in the direction \(45^{\circ}\) west of north at \(25 km / hr\) in 5 minutes. What is the average speed of the car?

A. \(81.2 km / hr\)
B. \(43.4 km / hr\)
C. \(71.4 km / hr\)
D. \(41.7 km / hr\)

Question 1200:

In which of the following groups are the radiations arranged in the decreasing order of their wavelength?

A. Radio waves, gamma rays, \(X\) - rays
B. Radio waves, \(X\) - rays, gamma rays
C. X - rays, gamma rays, radio waves
D. Gamma rays, \(X\) - rays, radio waves