Post Utme Physics Past Questions and Answers

Question 1281:

The mode of heat transfer which does not require material medium is ____________

A. Conduction
B. Radiation
C. Convection
D. Propagation

Question 1282:

The height at which the atmosphere ceases to exist is about \(80 km\), if the atmospheric pressure on the ground level is \(760 mmHg\), the pressure at height of \(20 km\) above the ground is ____________

A. \(380 mmHg\)
B. \(570 mmHg\)
C. \(190 mmHg\)
D. \(480 mmHg\)

Question 1283:

A simple pendulum \(0.6 m\) long has a period of \(1.55\), what is the period of a similar pendulum \(0.4\) long in the same direction

A. \(1.4 \sqrt{\frac{1}{3}}\)s
B. \(1.5 \sqrt{\frac{1}{3}}s\)
C. \(2.25\)s
D. \(1.00\)s
E. \(2.00\)s

Question 1284:

Which of the following is common to evaporation and boiling, they ____________

A. Take place at any temperature
B. Are surface phenomena
C. Involve change of state
D, take place at a definite pressure
D. None of the above

Question 1285:

A house hold refrigerator is rated 200 watts. If electricity costs \(5 k\) per kwh, what is the cost of operating it for 20 days ____________

A. #4.80
B. \(\# 48.00\)
C. \(\# 480.00\)
D. \(\# 4800.00 \)
E. #240.00