Josephine D’silva

St Patricks High School

Physics X Deformation
MCQs

1. A metal wire, of initial length 1000 mm, extends by 4 mm when a load of 2 N is added to it.What is the
length of the wire when a further 3 N is added, assuming that the wire does not
extend beyond the limit of proportionality?
A 1006 mm B 1008 mm C 1010 mm D 1012 mm

2. A spring has a length of 9 cm when loaded with a 200 g mass. The extension-mass graph for the spring is
shown.

The 200 g mass is replaced

with a 100 g mass. What is the
new length of the spring?

A 7 cm B 8 cm

C 9 cm D 10 cm

3.An experiment is carried out to measure

the extension of a rubber band for
different loads.The results are shown
below.
Which figure is missing from the table?
A 17.2 B 17.3 C 17.4 D 17.6

4.A student adds weights to an elastic cord. He measures the length of the cord for each weight.
He then plots a graph from the results, as shown.
What has he plotted on the vertical axis?
A measured length
B original length
C (measured length +
original length)
D (measured length –
original length)

5.The diagrams show a steel spring and a graph of

its length against the load applied to it.
What is the extension of the spring when a load of
20 N is applied to it?

A 3.0 cm B 4.5 cm
C 5.0 cm D 8.0 cm

Page 1 of 4
 Josephine D’silva
Theory
1.The Fig shows how the length of a spring varies as the force applied to it increases.
(a) Determine the length of the
unstretched spring.

…………………………………….[1]
(b) Explain how the graph shows that the
limit of proportionality is not reached

……………………………………………

………………………………………….

……………………………………… [1]

(c) The spring is attached to a mass M of 0.20 kg and placed on a frictionless surface, as shown in Fig.

The apparatus is placed

on the floor of a car.
When the car
accelerates uniformly
in the direction shown,
the spring extends.

(i) State what is meant by a uniform acceleration.

……………………………………………………………………………………………………………

……………………………………………………………………………………………………… [2]
(ii) The extension of the spring is 9.0 cm.Using Fig., determine

1. the horizontal force on M [1]

2. the acceleration of M [2]

Page 2 of 4
 Josephine D’silva
2. Four students, A, B, C and D, each have a spring. They measure the lengths of their springs
when the springs are stretched by different loads.
Their results are shown in Fig. 2.1.

(a) (i) State which student had loaded the spring beyond the limit of proportionality.

……………………………................................................................................................................................... [1]
(ii) Explain how you obtained your answer to (a)(i).

.......................................................................................................................................................................................

........................................................................................................................................................................... [2]

(b) For the spring used by student A, calculate

(i) the extra extension caused by each additional 0.5 N,

extra extension = ................................................ [1]

(ii) the unloaded length of the spring.

unloaded length = ................................................ [1]

(c) Student A obtains a second spring that is identical to his first spring. He hangs the two springs side by side, as
shown in Fig. 2.2.

Use the table to calculate the length of each of the springs when a load of 2.5 N is
hung as shown in Fig. 2.2. Show your working.

length ................................................. [2]

Fig. 2.2

Page 3 of 4
 Josephine D’silva
3.Fig. shows apparatus used to obtain the readings for a graph of force against extension for a spring

The masses added to the pan produce a force that stretches the
spring.
(a) (i) State what is meant by the mass of a body.

………………………………………………………………….

………………………………………………………………..[1]
(ii)Describe how the scale is used to find the extension of the
spring

………………………………………………………………

……………………………………………………………………………………………………………..…[1]

(b) Fig. shows the force-extension graphs for two different springs.

A student states that spring B is easier to stretch than spring A.Use values from Fig to explain what the
student means
………………………………………………………………………………………………………………

…………………………………………………………………………………………………………….1]

Page 4 of 4