Post Utme Physics Past Questions and Answers

Question 1196:

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

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

Question 1197:

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

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

Question 1198:

$A50g$ 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 $=2100Jk{g}^{-1}{k}^{-1}$ and latent heat of fusion of ice $=3.34\times {10}^{5}Jk{g}^{-1}$, specific heat capacity of water $=4200Jk{g}^{-1}$

A. $20kJ$
B. $33kJ$
C. $23kJ$
D. $28kJ$

Question 1199:

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

A. $81.2km/hr$
B. $43.4km/hr$
C. $71.4km/hr$
D. $41.7km/hr$

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