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CBSE Class 8  >  Class 8 Test  >  Science   >  Test: Force & Pressure - 3 - Class 8 MCQ

Force & Pressure - 3 - Free MCQ Practice Test with solutions, Class 8 Science


MCQ Practice Test & Solutions: Test: Force & Pressure - 3 (15 Questions)

You can prepare effectively for Class 8 Science Class 8 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Force & Pressure - 3". These 15 questions have been designed by the experts with the latest curriculum of Class 8 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 15

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Test: Force & Pressure - 3 - Question 1
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Which of the following is a contact force:

Detailed Solution: Question 1

The frictional force is a contact.
These are the forces that act upon bodies when they are in physical contact with each other and one body is trying to slide over the other body.

Test: Force & Pressure - 3 - Question 2
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Which of these is an example of a non-contact force?

Detailed Solution: Question 2

Magnetic force is a force, like gravity, that is able to act across a distance without touching an object that is attracted by it. So magnetic force is a non-contact force.

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Test: Force & Pressure - 3 - Question 3
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Tick the most appropriate answer.
If F is a force acting normally on a surface of area A, then the pressure P is given by:

Detailed Solution: Question 3

We know that pressure is defined as force acting normally per unit area of a surface.
It is given by
Pressure = Forece/Area = F/A

Test: Force & Pressure - 3 - Question 4
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A wooden piece 5N in weight and  5cm x 3cm x 2cm in size lies on 5cm x 2cm face. The pressure exerted by it in  N per cm2 is:

Detailed Solution: Question 4

The correct calculation for the pressure exerted by the wooden piece should be considered.
Pressure is defined as force per unit area.
The wooden piece has a weight (force) of 5 N and lies on a face with dimensions 5 cm x 2 cm, giving an area of 5 × 2 = 10 cm². Therefore, the pressure exerted by the wooden piece is calculated as 5 N / 10 cm² = 0.5 N/cm². The correct answer is option 3, which is 0.5.

Test: Force & Pressure - 3 - Question 5
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To move at the same speed, a car with a flat face and another with a streamlined body will require a different amount of force from the engine. The engine of the streamline bodied car will:

Detailed Solution: Question 5

Friction opposes the relative motion between two surfaces in contact. Fluid friction can be minimized by giving suitable shapes to bodies moving in fluids. A car with a streamlined body suffers less air friction while moving and a car with a flat face will suffer higher air friction. As a result car with a streamlined body will require less force from the engine to maintain the same speed.

Old NCERT

Test: Force & Pressure - 3 - Question 6
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which of the following statement is correct

Detailed Solution: Question 6

  • Statement 1 is incorrect: Pressure is defined as force per unit area, so it is directly proportional to the force applied and inversely proportional to the area over which it is applied.
  • Statement 2 is correct: The perpendicular distance from the pivot of a rotating body to the line of action of the force is called the moment arm or lever arm. This is the correct definition as per the NCERT textbook and is used in the calculation of torque.
  • Statement 3 is incorrect: Wooden sleepers are placed under railway tracks to decrease pressure by increasing the area over which the weight of the train is distributed, thus preventing the tracks from sinking into the ground. The original statement was also incomplete.
  • Statement 4 is incorrect: Pressure can be affected by the roughness of surfaces in contact, as it influences the actual area of contact and the distribution of force.

Test: Force & Pressure - 3 - Question 7
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A vehicle sinks into soft ground. The vehicle is changed so that it does not sink as far. Which change is made?

Detailed Solution: Question 7

When a vehicle sinks into soft ground, it is because the pressure exerted by the tyres on the ground is too high. Pressure is calculated as the force (in this case, the weight of the vehicle) divided by the area over which the force is applied. If the tyres are made wider, the area in contact with the ground increases. Since the weight of the vehicle does not change, increasing the contact area will reduce the pressure on the ground. Lower pressure means the vehicle is less likely to sink into the soft ground. Therefore, using wider tyres is the correct change to prevent the vehicle from sinking as much.

Test: Force & Pressure - 3 - Question 8
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When we press the bulb of dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to:

Detailed Solution: Question 8

The rise of water in the dropper is due to atmospheric pressure.
When the bulb of a dropper is pressed, the pressure inside the dropper decreases and this causes the water to go inside the dropper.

Test: Force & Pressure - 3 - Question 9
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On a body, a force of 5N is applied towards North and another force of 2N is applied towards South. Net force on the body is

Detailed Solution: Question 9

When forces are applied in the opposite directions, the forces get subtracted.
So, net force on the body = (5-2) N = 3N

Test: Force & Pressure - 3 - Question 10
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At what position the fluid experiences more pressure

Detailed Solution: Question 10

The pressure at a point in the fluid is due to the weight of the fluid above that point, acting on unit area.
Since the weight above the bottommost point is the highest, the pressure is maximum at that point.

Test: Force & Pressure - 3 - Question 11
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In terms of physics, which of the following are considered as fluids?

Detailed Solution: Question 11

A fluid is defined as a substance that has no fixed shape and yields easily to external pressure. They are free to flow, and hence the name fluid. They are of two kinds- Gases and Liquids.

Solids are not classified as fluids as they have a definite shape and volume.

Old NCERT

Test: Force & Pressure - 3 - Question 12
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Fluid pressure comprises of which of the following pressures?

Detailed Solution: Question 12

A fluid is defined as a substance that has no fixed shape and yields easily to external pressure. They are of two kinds- Gases and Liquids.
The fluid pressure is, thus, of two kinds.
One is due to gases(air) and is called air pressure.
The other is due to liquids(water) and is called water pressure.

Old NCERT

Test: Force & Pressure - 3 - Question 13
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Why does a sharp knife enable us to cut through things more easily?

Detailed Solution: Question 13

The pressure is defined as the force per unit area. i.e  P=F/A
So the pressure depends on the force F and area A of contact.
If force is constant, the pressure is only depends on the area. 
A sharp knife edge has small area of contact and less area of contact will produce the more pressure. 
Thus, the option B can be correct.  

Old NCERT

Test: Force & Pressure - 3 - Question 14
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Compare the pressure exerted by a sharp needle on a surface and the pressure exerted by a blunt needle.

Detailed Solution: Question 14

Pressure is defined as P = Force applied/Area

So the pressure applied is inversely proportional to the area to which it is applied.

Since in a sharp needle, surface area on which the force is applied, is less than that for a blunt needle.

Hence, pressure exerted by a sharp needle is more than blunt needle. 

Test: Force & Pressure - 3 - Question 15
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A force is needed to :

Detailed Solution: Question 15

  • Force is necessary to change an object's motion or rest status.
  • This means applying force can make a stationary object move or a moving object stop.
  • For example, pushing a car that is parked requires force to change its state.
  • Keeping an object in motion or at rest doesn't need continuous force unless external forces (like friction) act on it.

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About this Class 8 Practice Test

This test contains 15 MCQs on Force & Pressure - 3 with detailed solutions for each question. It is part of the Science Class 8 course on EduRev, designed to align with the current Class 8 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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