⚡ Force and Pressure – MCQs for Class 8 Science

Part 1: Q1–Q25

Q1. Force can change the:

A) Shape of an object
B) Motion of an object
C) State of rest of an object
D) All of these

✅ Correct Answer: D) All of these

Explanation:

• A) True: Squeezing a rubber ball changes shape.
• B) True: Force can start or stop motion.
• C) True: Can move a resting object.
• D) ✔ All are effects of force.

Q2. A push or pull on an object is called:

A) Energy
B) Pressure
C) Force
D) Power

✅ Correct Answer: C) Force

Explanation:

• A) Energy is the ability to do work.
• B) Pressure is force per unit area.
• C) ✔ Push or pull = Force.
• D) Power = work/time.

Q3. Which of the following is a contact force?

A) Gravitational force
B) Frictional force
C) Magnetic force
D) Electrostatic force

✅ Correct Answer: B) Frictional force

Explanation:

• A, C, D) Non-contact forces.
• B) ✔ Friction requires physical contact.

Q4. Which of the following is a non-contact force?

A) Muscular force
B) Frictional force
C) Gravitational force
D) Normal reaction

✅ Correct Answer: C) Gravitational force

Explanation:

• A, B, D) Require contact.
• C) ✔ Gravity acts without contact.

Q5. The SI unit of force is:

A) Joule
B) Watt
C) Newton
D) Pascal

✅ Correct Answer: C) Newton

Explanation:

• A) Joule = unit of work.
• B) Watt = unit of power.
• C) ✔ Newton = unit of force.
• D) Pascal = unit of pressure.

Q6. The SI unit of pressure is:

A) Newton
B) Pascal
C) Joule
D) Dyne

✅ Correct Answer: B) Pascal

Explanation:

• A) Force.
• B) ✔ Pressure = Force/Area, unit = N/m² = Pascal.
• C) Work.
• D) Smaller force unit (not SI).

Q7. If area decreases and force remains constant, pressure will:

A) Increase
B) Decrease
C) Remain same
D) Become zero

✅ Correct Answer: A) Increase

Explanation:

• Pressure = Force / Area.
• Smaller area = higher pressure.
• A) ✔ Correct relation.

Q8. Pressure in liquids is transmitted equally in all directions. This is known as:

A) Newton’s Law
B) Archimedes’ Principle
C) Pascal’s Law
D) Boyle’s Law

✅ Correct Answer: C) Pascal’s Law

Explanation:

• A, B, D – Different principles.
• C) ✔ Pascal’s Law states pressure in fluids transmits equally.

Q9. Which of these is NOT an effect of force?

A) Change direction
B) Change speed
C) Change color
D) Change shape

✅ Correct Answer: C) Change color

Explanation:

• A, B, D – Possible with force.
• C) ✔ Force cannot change color.

Q10. Frictional force always acts:

A) In the direction of motion
B) Opposite to the direction of motion
C) Perpendicular to the motion
D) Along gravitational pull

✅ Correct Answer: B) Opposite to the direction of motion

Explanation:

• A) Wrong.
• B) ✔ Friction resists motion.
• C, D) Not correct.

Q11. Which of the following reduces friction?

A) Oil or grease
B) Rough surface
C) Increasing weight
D) Sand particles

✅ Correct Answer: A) Oil or grease

Explanation:

• A) ✔ Lubricants reduce friction.
• B, C, D – Increase friction.

Q12. Pressure in fluids depends on:

A) Depth
B) Density
C) Acceleration due to gravity
D) All of these

✅ Correct Answer: D) All of these

Explanation:

• P = hρg (depends on depth, density, gravity).
• D) ✔ All factors affect pressure.

Q13. A sharp knife cuts better than a blunt one because:

A) It is lighter
B) It has larger area
C) It applies more force
D) It has smaller area of contact

✅ Correct Answer: D) It has smaller area of contact

Explanation:

• A, B, C – Incorrect reasons.
• D) ✔ Smaller area = more pressure = easy cutting.

Q14. Pressure at the bottom of a liquid container depends on:

A) Shape of container
B) Surface area of liquid
C) Height of liquid column
D) Color of liquid

✅ Correct Answer: C) Height of liquid column

Explanation:

• P = hρg depends only on height, not shape or color.

Q15. Gravitational force always acts:

A) Upward
B) Downward towards Earth’s center
C) Along motion of body
D) Randomly

✅ Correct Answer: B) Downward towards Earth’s center

Explanation:

• B) ✔ Gravity pulls objects toward Earth’s center.

Q16. A man standing on snow sinks less when he wears:

A) Normal shoes
B) Slippers
C) Shoes with flat soles
D) Shoes with pointed heels

✅ Correct Answer: C) Shoes with flat soles

Explanation:

• Larger area → less pressure.
• C) ✔ Flat soles distribute weight.

Q17. Force per unit area is defined as:

A) Energy
B) Work
C) Pressure
D) Power

✅ Correct Answer: C) Pressure

Explanation:

• A, B, D – Different physical quantities.
• C) ✔ Pressure = Force / Area.

Q18. Which of the following exerts atmospheric pressure?

A) Air
B) Water
C) Ice
D) Rock

✅ Correct Answer: A) Air

Explanation:

• A) ✔ Air exerts atmospheric pressure.
• B, C, D – Do not cause atmospheric pressure.

Q19. Unit of atmospheric pressure is:

A) N
B) N/m²
C) Pascal
D) Both B and C

✅ Correct Answer: D) Both B and C

Explanation:

• 1 Pascal = 1 N/m²
• D) ✔ Both terms are correct.

Q20. Pressure decreases with:

A) Increase in depth
B) Decrease in depth
C) Increase in altitude
D) Decrease in altitude

✅ Correct Answer: C) Increase in altitude

Explanation:

• A, B, D – Wrong.
• C) ✔ Higher altitude → less air above → less pressure.

Q21. A force can move an object only when:

A) The object is very heavy
B) The force is greater than friction
C) The object is in air
D) The surface is smooth

✅ Correct Answer: B) The force is greater than friction

Explanation:

• B) ✔ Motion happens only if applied force > friction.

Q22. Muscular force is a type of:

A) Contact force
B) Non-contact force
C) Magnetic force
D) Electrostatic force

✅ Correct Answer: A) Contact force

Explanation:

• A) ✔ Muscular force requires physical contact.

Q23. The pressure exerted by liquids at rest is called:

A) Hydraulic pressure
B) Hydrostatic pressure
C) Atmospheric pressure
D) Pascal pressure

✅ Correct Answer: B) Hydrostatic pressure

Explanation:

• B) ✔ Hydrostatic pressure = pressure in liquids at rest.

Q24. Which instrument measures atmospheric pressure?

A) Thermometer
B) Barometer
C) Hydrometer
D) Manometer

✅ Correct Answer: B) Barometer

Explanation:

• B) ✔ Barometer measures atmospheric pressure.

Q25. A boy pulls a toy car with force F. The car moves because:

A) Force is applied
B) Energy is used
C) Force changes state of rest
D) All of these

✅ Correct Answer: D) All of these

Explanation:

• Force is applied → energy spent → rest converted to motion.
• D) ✔ All statements correct.

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