# Class 9 Physics Chapter 7 MCQs 2024

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## Class 9 Physics Chapter 7 MCQs With Answers

1: In which of the following state molecules do not leave their position?

(a) solid
(b) liquid
(c) gas
(d) plasma

2: Which of the substances is the lightest one?

(a) copper
(b) Mercury
(c) aluminum

3: SI unit of pressure is Pascal, which is equal to:

(a) 4
(b) 10 N/m2
(C) Nm
(d) 10 Nm

4: What should be the approximate length of a glass tube to construct a water barometer?

(a) 0.5 m
(b) 1 m
(c) 2.5 m
(d) 11 m

5: According to Archimedes, upthrust is equal to:

(a) weight of displaced liquid
(b) the volume of the displaced liquid
(c) mass of displaced liquid
(d) none of these

6: The density of a substance can be found with the help of:

(a) Pascal’s law
(b) Hooke’s law
(c) Archimedes principle
(d) Principle of floatation

7: According to Hooke’s law

(a) stress x strain = constant
(b) stress / strain = constant
(c) strain / stress = constant
(d) stress = strain

The following force-extension graphs of a spring are drawn on the same scale. Answer the questions given below from (viii) to (x).
Which graph does not obey Hooke’s law?

(a)
(b)
(c)
(d)

Which graph gives the smallest value of the spring constant?

(a)
(b)
(c)
(d)

Which graph gives the largest value of the spring constant?

(a)
(b)
(c)
(d)