Table of Contents

Class 9 Physics Full book MCQs

We will solve all MCQs of revised smart syllabus of 9th class physics new book 2025 Punjab Boards.

Chapter 1 1.1 The instrument that is most suitable for measuring the thickness of a few sheets of cardboard is

(a) meter rule (b) Measuring tape (c) Vernier Callipers (d) micermeter screw gauge

Option C is correct.

Reason:- Vernier callipers precisely measures the thickness of cardboard sheets due to its flat jaw.

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1.2 One femtometer is equal to

$$(a)\;10^{-9}m\;(b)\;10^{-15}m\;(c)\;10^9m\;(d)\;10^{15}m$$

Option B is correct.

Reason:- Femto means 10 to raised power -15. In Nuclear physics, we use this unit.

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1.4 Which one is a non-physical quantity ?

(a) distance (b) density (c) colour (d) temperature

Option C is correct.

Reason:-Colour depends on observer.

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1.5 When using a measuring cylinder, one precaution to take is to:

(a) check for the zero error (b) look at the meniscus from below the level of the water surface (c) take several readings by looking from more than one direction (d) position the eye in line with bottom of the meniscus

Option D is correct.

Reason:- Correct position of eye will almost eliminate the chances of human error.

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1.7 A displacement can is used to measure:

(a) mass of a liquid (b) mass of a solid (c) volume of a liquid (d) volume of a solid

Option D is correct.

Reason:- Displacement can can measure volume of regular as well as irregular shaped solid by displacement method.

We can directly measure mass of liquid and solid with the help of balance and measuring cylinder can measure the volume of a liquid.

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1.9 Four students measure the diameter of a cylinder with vernier callipers. which of the following reading is correct ?

(a) 3.4 cm (b) 3.475 cm (c) 3.47 cm (d) 3.5 cm

Option C is correct.

Reason:- Least count of vernier calliper is 0.01 cm which is 2 decimal places and there are also 2 digits after the decimal in 3.47.

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1.10 Which of the following measures are likely to present the thickness of a sheet of this book ?

$$(a)\;\;6\times10^{-25}\;m\;\;\;(b)\;1\times10^{-4}\;m\\\\(c)\;1.2\times10^{-15}\;m\;\;(d)\;4\times10^{-2}\;m$$

Option B is correct.

Reason:- Measurements in option a and c are very small and measurement in option d is 4 cm. Option B is 0.1 mm so, its correct.

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Chapter 2 2.1 The numerical ratio of displacement to distance is:

(a) always less than one (b) always equal to one (c) always greater than one (d) equal to or less than one

Option (d) is correct.

Explanation:-

Because displacement is the shortest distance so, distance will always be equal or greater than the displacement.

If motion is in straight line, ration between displacement and distance will be 1.

But, if displacement is less than distance, that is motion is curved, numerical ratio of displacement to distance will also be less than 1.

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2.2 If a body does not change its position with respect to some fixed point, then it will be in a state of:

(a) rest (b) motion (c) uniform motion (d) variable motion

Option (a) is correct

Explanation:-

Rest means object is not changing its position with respect to its surroundings

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2.3 A boll is dropped from the top of a tower, the distance covered by it in the first second is:

(a) 5 m (b) 10 m (C) 50 m (d) 100 m

Option ( a ) is correct.

Explanation:-

$$Initial\;velocity=v_i=\;0\\Acceleration=g=10\;ms^{-2}\\Time\;=\;t\;=\;1\;s\\Dis\tan ce\;=\;S\;=\;?$$

FORMULA:- $$S\;=\;v_it\;+\frac12gt^2$$

$$S\;=(0)\;(1)+\frac12(10)\;{(1)}^2\\\\S\;=\;5\;m$$

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2.4 A body accelerates from rest to a velocity of 144 Km in 20 second. The distance covered by it is:

(a) 100 m (b) 400 m (c) 1400 m (d) 1440 m

Option ( b ) is correct.

Explanation:-

$$Initial\;velocity=v_i=0\\\\Final\;velocity=v_f=144kmh^{-1}\\=144\;(\frac{1000}{3600})\;=\;40\;ms^{-1}\\\\Time\;=\;t\;=\;20\;s\\Dis\tan ce\;=\;S\;=\;?\\$$

FORMULA:- $$S\;=\;V_{av}\;\times\;t\\\\S\;=\;(\frac{v_i\;+\;v_f}2)\;t\\$$

$$After\;putting\;the\;values\\We\;get\\\\S\;=\;(\frac{0\;+\;40}2)\;(\;20\;)\\S\;=\;400\;m\\$$

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2.7 The area under the speed-time graph is numerically equal to:

(a) velocity (b) uniform velocity (c) acceleration (d) distance covered

Option ( d ) is correct.

Explanation:-

Because S = V t. Distance is equal to the product of speed and time.

Chapter 3 3.1 When we kick a stone, we get hurt. This is due to:

(a) inertia (b) velocity (c) momentum (d) reaction

Option ( d ) is correct.

Explanation:- Newton’s Third Law of motion. Action and reaction are equal in magnitude but opposite in direction

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3.2 An object will continue its motion with constant acceleration until:

(a) the resultant force on it begins to decrease.

(b) the resultant force on it is zero.

(c) the resultant force on it begin to increase.

(d) the resultant force is at right angle to its tangential velocity.

Option (a) is correct.

Explanation: – Newton’s First Law of motion. An object moving with constant speed in straight line continues it unless an external force tries to stop it.

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3.3 Which of the following is a non-contact force?

(a) Friction (b) Air resistance (c) Electrostatic force (d) Tension in the string

Option (c) is correct.

Explanation: – Non contact force is a force that acts on an object without physical contact.

3.5 A particle of mass m moving with a velocity v collides with another particle of the same mass at rest. The velocity of the first particle after collision is:

(a) v (b) -v (c) 0 (d) -1/2

Option (c) is correct.

Explanation: –

The moving particle comes to rest because collision is perfectly elastics and both the particles have equal masses

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3.6 Conservation of linear momentum is equivalent to:

(a) Newton’s fist law of motion

(b) Newton’s second law of motion

(c) Newton’s third law of motion

(d) None of these

Option (c) is correct

Explanation: – Action and reaction are equal in magnitude but opposite in direction. Before collision is action and after the collision is reaction.

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3.9 A lubricant is usually introduced between two surfaces to decrease friction. The lubricant:

(a) decreases temperature

(b) acts as ball bearings

(c) prevents direct contact of the surfaces

(d) provides rolling friction

Option (c) is correct.

Explanation: –

A thin layer of lubricant reduces friction because their will be no direct contact between the surfaces.

Chapter 4 4.1 A particle is simultaneously acted upon by two forces of 4 and 3 newtons. The net force particle is:

(a) 1 N (b) between 1 N and 7 N (c) 5N (d) 7 N

Option (b) is correct.

Explanation:-

If the the forces are in same direction their sum will be 7 N and id they are in opposite direction their sum will ne 1N.

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4.2 A force F is making an angle of 60 degree with x-axis. Its y-component is equal to:

(a) F (b) F Sin60 (c) F Cos60 (d) F Tan60

Option (b) is correct.

Explanation:-

X-component will be F Cos 60 and Y-component will be F Sin 60.

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4.3 Moment of force is called:

(a) moment arm (b) couple (c) couple arm (d) torque

Option (d) is correct.

Explanation:-

Another name of torque is moment.

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4.7 In stable equilibrium, the centre of gravity of the body lies:

(a) at the highest position (b) at the lowest position

Option (b) is correct.

Explanation:-

Centre of gravity is at lowest position because small tilt rises the centre of gravity and gravity pulls it back down to balance again.

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4.9 A cylinder resting on its circular base is in:

(a) stable equilibrium (b) unstable equilibrium

Option (a) is correct.

Explanation:-

A cylinder resting on its circular base in in stable equilibrium because when it is slightly tilted, it comes back to its original position.

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4.10 Centripetal force is given by:

$$(a)\;r\;F\\(b)\;r\;F\;Cos\;Ɵ\\(c)\;\frac{m\;v^2}r\\(d)\;\frac{m\;v}{r^2}$$

Option (c) is correct.

Explanation:-

$$Centripetal\;acceleration\\is\;equal\;to\;\;\frac{v^2}r\\We\;know\;that\\F=\;m\;a\\Hence\\F\;=\;m\;\frac{v^2}r\\F=\;\frac{m\;v^2}r$$

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Chapter 5 1:- Work done is maximum when the angle between the force F and the displacement d is:

(a) 0°

(b) 30°

(c) 60°

(d) 90°

Correct Option is (a)

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3:- The SI unit of power is:

(a) joule

(b) newton

(d) second

Correct option is (c)

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5 :- A bullet of mass 0.05 kg has a speed of 300 meter per second. Its kinetic energy will be:

(a) 2250 J

(b) 4500 J

(d) 1125 J

Correct Option is (a)

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6:- If a car doubles its speed , its kinetic energy will be:

(a) the same

(b) doubled

(d) increase to four times

Correct option is (d)

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8 :- The magnitude of momentum of an object is doubled, the kinetic energy of the object will:

(a) double

(b) increase to four times

(d) remain the same

Correct option is (b)

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9 :- Which of the following is not renewable energy source?

(a) Hydroelectric energy

(b) Fossil fuels

(d) Solar energy

Correct option is (b)

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Chapter 6 6.1 A wire is stretched by a weight w. If the diameter of the wire is reduced top half of its previous value, the extension will become:

(a) one half

(b) double

(d) four times

Correct option is (d)

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6.3 Two metal plates of area 2 and 3 square meters are placed in a liquid at the same depth. The ratio of pressure on the two plates is:

(a) 1:1

(b) square root 2 : square root 3

(d) 4:9

Correct option is (a)

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6.6 The principle of a hydraulic press is based on:

(a) Hooke’s law

(b) Pascal’s law

(d) Principle of conversion of momentum

Correct option is (b)

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6.7 When a spring is compressed, what form of energy does it posses?

(a) Kinetic

(b) Potential

(d) Heat

Correct option is (b)

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6.8 What is the force exerted by the atmosphere on a rectangular block surface of length 50 cm and breadth 40 cm? The atmospheric pressure is 100 KPa.

(a) 20 KN

(b) 100 KN

(d) 500 KN

Correct option is (a)

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Chapter 7 7.3 Temperature of a substance is:

(a) the total amount of heat contained in it

(b) the total number of molecules in it

(d) dependent upon the intermolecular distance

Correct option is (c)

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7.4 Heat is the:

(a) total Kinetic energy of the molecules

(b) the internal energy

(d) the energy in transit

Correct option is (d)

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7.5 In Kelvin scale, the temperature corresponding to melting point of ice is:

(a) zero

(b) 32

(d) +273

Correct option is (d)

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7.6 The temperature which has the same value on Celsius and Fahrenheit scale is:

(a) -40

(b) +40

(d) -45

Correct option is (a)

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7.8 One disadvantage of using in a liquid-in-glass thermometer:

(a) it has large expansivity

(b) it has low freezing point(-112 degree Celsius)

(d) its expansion is linear

Correct option is (c)

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7.9 Water is not used as a thermometric liquid mainly due to:

(a) colourless

(b) a bad conductor of heat

(d) a low boiling point(100 degree Celsius)

Correct option is (c)

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Chapter 8 8.1 Which one of the following is not a magnetic material?

(a) Cobalt

(b) Iron

(d) Nickel

Correct option is (c)

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8.2 Magnetic lines of force:

(a) are always directed in a straight line

(b) cross one another

(d) enter into the south pole

Correct option is (d)

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8.5 A common method used to magnetic a material is:

(a) stroking

(b) hitting

(d) placing inside a solenoid having A.C

Correct option is (a)

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Chapter 9 9.1 Physics is a branch of:

(a) social science

(b) life science

(d) biological science

Correct option is (c)

Physics is a branch of physical science

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9.2 Which branch of science plays vital role in technology and engineering?

(a) Biology

(b) Chemistry

(d) Physics

Correct option is (d)

Physics plays vital role in technology and engineering

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9.3 Automobile technology is based on:

(a) acoustics

(b) electromagnetism

(d) thermodynamics

Correct option is (d)

Automobile technology is based on thermodynamics

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9.6 What is the ultimate truth of a science method?

(a) Hypothesis

(b) Experimentation

(d) Law

Correct option is (d)

The ultimate truth of a science method is law

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9.8 Which of the following are methods of investigation?

(a) Observation

(b) Experimentation

(d) All of these

Correct option is (d)

Observation experimentation and research are methods of investigation

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9.9 A hypothesis:

(a) may or may not be testable

(b) is supported by evidence

(d) all of these

Correct option is (c)

A hypothesis is a possible answer to a question

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9.10 A graph of an organized data is an example of:

(a) collecting data

(b) forming a hypothesis

(d) analyzing data

Correct option is (d)

A graph of an organized data is an example of analyzing data

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