Elasticity - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1988

the fig above shows three different ways of hanging a heavy picture from a hook. the tension in the string will be

A. Greatest in X
B. Greatest in Y
C. Greatest in Z
D. Same in each one

Question 12:

• JAMB 1989

In the fig above W1 = 200g, and W2 =450g . Calculate the extension of the spring per unit load?
[g = 10ms^-2]

A. 6.0 x 10^-5mN^-1
B. 2.5 x 10^-4mN^-1
C. 6.0 x 10 ^-3mN^-1
D. 2.5 x 10 ^-2mN^-1

Question 13:

• JAMB 1991

The spiral spring of a spring balance is 25.0cm long when 5N hangs on it and 30cm long, when the weight is 10N. What is the length of the spring if the weight is 3N assuming Hooke's law is obeyed?

A. 15.0cm
B. 17.0cm
C. 20.0cm
D. 23.0cm

Question 14:

• JAMB 1992

In an experiment to determine Young's Modulus for a wire, several loads are attached to the wire and the corresponding extension measured. The tensile stress in each case depends on the

A. Load and the extension
B. Load and the radius of the wire
C. Radius of the wire and the extension
D. Extension and the original length of the wire

Question 15:

• JAMB 1994

A spring of length 25cm is extended to 30cm by a load of 150N attached to one of its end, what is the energy stored in the spring?

A. 3750J
B. 2500J
C. 3.75J
D. 2.50J