Post Utme Physics Past Questions and Answers

Question 1176:

Which of the following correctly describes the image of an object, \(4 cm\) from a diverging lens of focal length\(12 cm\) ?

A. The image is virtual, \(3 cm\) in front of the lens
B. The image is real, \(6 cm\) bchind the lens
C. The image is virtual, \(6 cm\) in front of the lens
D. The image is real, \(3 cm\) in front of the lens

Question 1177:

4g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate \(3.5\) g of material?

A. \(11 / 4\) days
B. \(83 / 4\) days
C. 30 days
D. 80 days

Question 1178:

The space between the double glass walls of a thermos flask is evacuated and the two surfaces facing the evacuated space are silvered. The residual source of heat loss takes place by

A. Convection
B. Radiation from the surfaces
C. Conduction through the stopper and the glass
D. Conduction across the walls

Question 1179:

A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses a coin vertically upwards, the coin will fall

A. In front of his palm
B. Behind his palm
C. Beside his palm
D. Into his palm

Question 1180:

A machine requires \(1000 J\) of work to raise a load of \(500 N\) through a vertical distance of \(1.5 m\). Calculate the efficiency of the machine

A. \(80 \%\)
B. \(75 \%\)
C. \(50 \%\)
D. \(33 \%\)