Jamb Physics 1981 Past Questions and Answers

Question 36:

• JAMB 1981

An object placed on the principle axis of a convex lens of focal length 10m produces a real image of double magnification. The image distance from the lens is

A. 30cm
B. 25cm
C. 20cm
D. 15cm
E. 10cm

Question 37:

• JAMB 1981

A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that

A. Is opaque
B. Has high density
C. Has regular expansion
D. Has a high thermal conductivity
E. Can wet glass

Question 38:

• JAMB 1981

The extension in a spring when 5g wt was hung from it was 0.56cm. If Hooke's law is obeyed, What is the extension caused by a load of 20g wt?

A. 1.12m
B. 2.14cm
C. 2.52cm
D. 2.80cm
E. 2.24cm

Question 39:

• JAMB 1981

Which of the following is NOT directly associated with direct current (DC)?

A. A dry cell
B. A moving coil galvanometer
C. A transformer
D. A lead- acid accumulator
E. A commutator

Question 40:

• JAMB 1981

The relationship between the period T and the length T of a smile pendulum is T = 2\( \pi \) \( ( \frac{I}{g}) ^{ \frac{1}{2} } \). From experiment data of T and I, one can obtain the following graphs, i. T vs.I ii. T vs I² iii. T² vs. I iv. T vs \( \sqrt{I} \) v. logT vs logI. Which of the following graphs, are linear?

A. All
B. Only i and ii
C. Only iii and iv
D. Iii,iv and v
E. None of them