⚡ Force and Pressure – MCQs for Class 8 Science

Part 2: Q26–Q50

Q26. A force can:

A) Only stop a moving body
B) Only start motion in a body
C) Change speed, direction, or shape of a body
D) Not affect a body at all

✅ Correct Answer: C) Change speed, direction, or shape of a body

Explanation:

• A, B – Only partial effects.
• C) ✔ Force can change motion, rest, speed, direction, and shape.
• D – Wrong, force always has an effect.

Q27. Pressure is directly proportional to:

A) Area
B) Mass
C) Force
D) Volume

✅ Correct Answer: C) Force

Explanation:

• Pressure = Force / Area.
• C) ✔ More force → more pressure.
• A) Inverse relation with area.
• B, D) Do not directly define pressure.

Q28. When you stand on one leg, the pressure on the ground:

A) Becomes half
B) Remains same
C) Becomes double
D) Becomes zero

✅ Correct Answer: C) Becomes double

Explanation:

• Standing on one leg reduces area → pressure increases.
• C) ✔ Pressure doubles as area halves.

Q29. Force exerted by air around us is called:

A) Hydrostatic pressure
B) Atmospheric pressure
C) Muscular pressure
D) Contact pressure

✅ Correct Answer: B) Atmospheric pressure

Explanation:

• A) Pressure in liquids.
• B) ✔ Air around us exerts atmospheric pressure.
• C, D – Wrong terms.

Q30. The normal atmospheric pressure at sea level is approximately:

A) 10 Pa
B) 100 Pa
C) 1000 Pa
D) 1,00,000 Pa

✅ Correct Answer: D) 1,00,000 Pa

Explanation:

• 1 atm = 1.013 × 10⁵ Pa ≈ 100,000 Pa.
• D) ✔ Correct.

Q31. The force exerted by Earth on an object is called:

A) Muscular force
B) Friction
C) Gravitational force
D) Magnetic force

✅ Correct Answer: C) Gravitational force

Explanation:

• A, B, D – Not universal pull.
• C) ✔ Earth pulls all objects via gravity.

Q32. Which device works on Pascal’s law?

A) Thermometer
B) Hydraulic brake
C) Barometer
D) Hygrometer

✅ Correct Answer: B) Hydraulic brake

Explanation:

• A, C, D – Different devices.
• B) ✔ Hydraulic brakes use fluid pressure transmission.

Q33. Force without contact is called:

A) Contact force
B) Non-contact force
C) Friction
D) Muscular force

✅ Correct Answer: B) Non-contact force

Explanation:

• A, C, D – Need contact.
• B) ✔ Gravity, magnetism, electrostatics = non-contact.

Q34. A rocket moves forward because of:

A) Gravitational force
B) Muscular force
C) Reaction force of gases
D) Atmospheric pressure

✅ Correct Answer: C) Reaction force of gases

Explanation:

• Newton’s 3rd Law: Action–Reaction.
• C) ✔ Rocket moves due to gases expelled backward.

Q35. A rolling ball stops due to:

A) Its weight
B) Friction
C) Muscular force
D) Pressure

✅ Correct Answer: B) Friction

Explanation:

• A, C, D – Not the main reason.
• B) ✔ Friction opposes motion and stops the ball.

Q36. If the same force is applied on a smaller area, 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.

Q37. A camel walks easily on sand because:

A) It is heavy
B) It has padded feet with large area
C) It walks slowly
D) It has strong legs

✅ Correct Answer: B) It has padded feet with large area

Explanation:

• A, C, D – Not main reason.
• B) ✔ Larger foot area reduces pressure → less sinking.

Q38. In pressure formula (P = F/A), pressure increases if:

A) Force decreases, area constant
B) Force constant, area increases
C) Force increases, area constant
D) Both force and area increase equally

✅ Correct Answer: C) Force increases, area constant

Explanation:

• C) ✔ More force on same area → more pressure.

Q39. The pressure exerted by liquids at rest is always:

A) Upward
B) Downward
C) Perpendicular to the walls of the container
D) Parallel to surface

✅ Correct Answer: C) Perpendicular to the walls of the container

Explanation:

• A, B, D – Not complete.
• C) ✔ Pressure in liquid acts perpendicular.

Q40. Which of these shows the effect of atmospheric pressure?

A) Bending of a plant in wind
B) Blowing of balloon
C) Sucking drink with straw
D) Burning of candle

✅ Correct Answer: C) Sucking drink with straw

Explanation:

• A, B, D – Not related.
• C) ✔ Liquid rises due to atmospheric pressure outside.

Q41. If an area of contact is doubled, and force remains same, pressure will:

A) Double
B) Half
C) Remain same
D) Become zero

✅ Correct Answer: B) Half

Explanation:

• P = F/A → More area = less pressure.
• B) ✔ Correct.

Q42. Which of the following is a balanced force situation?

A) A ball falling down
B) A parked car on road
C) A person running
D) A rocket taking off

✅ Correct Answer: B) A parked car on road

Explanation:

• A, C, D – Unbalanced forces act.
• B) ✔ Forces cancel out → rest.

Q43. Which of these is NOT a non-contact force?

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

✅ Correct Answer: D) Frictional force

Explanation:

• A, B, C – Act without contact.
• D) ✔ Friction needs contact.

Q44. When two forces act in opposite directions, net force is:

A) Sum of both
B) Difference of both
C) Zero always
D) Product of both

✅ Correct Answer: B) Difference of both

Explanation:

• B) ✔ Opposite direction → subtract magnitudes.

Q45. Pressure in a liquid increases with:

A) Decreasing depth
B) Increasing depth
C) Decreasing density
D) Increasing surface area

✅ Correct Answer: B) Increasing depth

Explanation:

• P = hρg.
• B) ✔ More depth = more pressure.

Q46. The upward force experienced by objects in liquids is called:

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

✅ Correct Answer: B) Buoyant force

Explanation:

• A, C, D – Not applicable.
• B) ✔ Upthrust in fluids = buoyancy.

Q47. A stone sinks in water but wood floats because:

A) Stone is lighter
B) Wood is denser
C) Stone is denser than water
D) Stone displaces more water

✅ Correct Answer: C) Stone is denser than water

Explanation:

• C) ✔ Density > water → sink. Density < water → float.

Q48. Which law explains why hydraulic lifts work?

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

✅ Correct Answer: C) Pascal’s Law

Explanation:

• C) ✔ Pressure in liquids transmits equally → hydraulic lift.

Q49. The pressure exerted by atmosphere on our body is balanced by:

A) Our bones
B) Internal body pressure
C) Earth’s gravity
D) Muscular force

✅ Correct Answer: B) Internal body pressure

Explanation:

• A, C, D – Do not balance.
• B) ✔ Body fluids exert equal internal pressure.

Q50. A boy applies force of 10 N on a box. If area of contact is 2 m², pressure exerted is:

A) 2 Pa
B) 5 Pa
C) 10 Pa
D) 20 Pa

✅ Correct Answer: B) 5 Pa

Explanation:

• P = F/A = 10 ÷ 2 = 5 Pa.
• B) ✔ Correct calculation.

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