Post Utme Physics Past Questions and Answers

Question 456:

What is the resistance of the filament of an electric lamp rated 220 V, 100 W?

A. 0.45
B. 2.2
C. 484
D. 440

Question 457:

Pressure cooker cooks faster because ____________

A. The inside ispolished
B. Inside the cooker, the boiling point of water is raised
C. Inside the cooker, the boiling point of water is lowered
D. Inside the cooker, the pressure of water is raised

Question 458:

A gasoline generator is used to power ten 40 W lamps, five 60 WI and a musician's 1000 W amplifying system.
If the generator runs for 5 hours, the energy used is ____________

A. 1.7 kWh
B. 8.5 kWh
C. 1.0 kWh
D. None of the above

Question 459:

Which of the following statements is not true about sound waves?

A. Soundwaves are longitudinal waves
B. Sound waves are transverse waves
C. Sound waves are mechanical waves
D. Sound waves can not propagate through vacuum

Question 460:

Which of the following statements is not true about the human eye?

A. The focal length of its lens is fixed
B. The focal length of its lens is variable
C. Image distance is fixed
D. All of them