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Practice Class 8 Science MCQ Questions with Answers based on the latest NCERT syllabus. Learn about force, pressure, contact and non-contact forces, muscular force, and the SI unit of force with original concept-based explanations, exam-focused notes, and NCERT-aligned content for CBSE and State Board students
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Chapter Information
Subject: Science
Class: 8
Chapter: Force and Pressure
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Easy to Moderate
Based On: Latest NCERT Syllabus
Introduction
Force and pressure are important concepts that explain how objects move, stop, or change their direction. A force may act as a push or a pull, while pressure describes how force acts on a surface. Understanding different types of forces and the concept of pressure helps students relate science to many real-life situations, such as walking, lifting objects, and the movement of fluids. This practice set provides original, NCERT-aligned explanations to strengthen conceptual understanding.
What You Will Learn
✔ Force and its effects
✔ Pressure and its formula
✔ Contact and non-contact forces
✔ Muscular force
✔ SI unit of force
Why This Topic Is Important?
The concepts of force and pressure form the foundation for many topics in Physics. They are frequently tested in CBSE, State Board, Olympiad, and scholarship examinations. A clear understanding of these ideas also supports learning in higher classes.
Exam Relevance
These questions are useful for:
✔ CBSE Exams
✔ State Board Exams
✔ School Tests
✔ Unit Tests
✔ Half-Yearly Exams
✔ Annual Exams
✔ Olympiad Preparation
✔ Scholarship Examinations
Q1. A push or a pull on an object is called?
A) Force
B) Gravity
C) Pressure
D) Friction
Answer
Force
Concept
Force is a push or pull that can change the state of motion or shape of an object.
Explanation
Applying a force can:
- Move a stationary object.
- Stop a moving object.
- Change the speed or direction of motion.
- Change the shape of an object.
Exam Focus
Remember: Force is simply a push or pull.
A force is simply a push or a pull acting on an object. It can change the shape, position, or motion of the object.
What force can do:
- Start or stop motion
- Change speed (faster or slower)
- Change direction
- Change shape of an object
Types of force:
- Contact force (needs physical touch)
- Non-contact force (acts without touching)
Examples:
- Pushing a door
- Pulling a rope
Q2. The SI unit of force is?
A) Joule
B) Newton
C) Watt
D) Pascal
Answer
Newton
Concept
The SI unit of force is Newton (N).
Explanation
One Newton is the force required to produce an acceleration of 1 m/s² in an object of mass 1 kilogram.
Exam Focus
Remember:
- Force → Newton (N)
- Pressure → Pascal (Pa)
Force is measured in Newton (N) in the SI system.
Why Newton?
It is named after Sir Isaac Newton, who explained the laws of motion.
Relation with formula:
Force = Mass × Acceleration
This means a force of 1 Newton is applied when 1 kg mass is accelerated at 1 m/s².
Example:
Kicking a football applies force measured in Newtons.
Q3. Which of the following is an example of a contact force?
A) Muscular force
B) Magnetic force
C) Gravitational force
D) Electrostatic force
Answer
Muscular force
Concept
A contact force acts only when two objects are in physical contact.
Explanation
Muscular force is produced by the muscles of humans or animals and requires direct contact with an object. Magnetic, gravitational, and electrostatic forces can act without physical contact.
Exam Focus
Remember:
- Contact force → Muscular force, Frictional force
Non-contact force → Magnetic, Gravitational, Electrostatic
A contact force is a force that acts only when two objects are in physical contact.
Muscular force:
It is produced by the muscles of humans or animals.
Examples of muscular force:
- Lifting a bag
- Pushing a cart
- Writing with a pen
Why correct answer:
Magnetic, electrostatic, and gravitational forces act without contact, but muscular force needs touch.
Q4. Pressure is defined as?
A) Area / Force
B) Force / Area
C) Force + Area
D) Force × Area
Answer
Force / Area
Concept
Pressure is the amount of force acting on a unit area.
Explanation
Pressure increases when the same force acts on a smaller area and decreases when it acts on a larger area.
Important Formula
$$\text{Pressure}=\frac{\text{Force}}{\text{Area}}$$
Exam Focus
Remember: Pressure depends on both force and area.
Pressure is defined as the amount of force applied on a unit area.
Formula:
Pressure = Force ÷ Area
Understanding it:
- Same force on a smaller area → more pressure
- Same force on a larger area → less pressure
Examples:
- A sharp knife cuts easily because pressure is high
- High heels exert more pressure than flat shoes
Q5. Liquids and gases exert pressure on?
A) None of these
B) Only side walls
C) In all directions
D) Only bottom of the container
Answer
In all directions
Concept
Fluids (liquids and gases) exert pressure on every surface they come in contact with.
Explanation
Unlike solids, liquids and gases can flow freely. Their particles move continuously, causing pressure to act not only on the bottom of a container but also on its sides and in every direction.
Exam Focus
Remember: Liquids and gases exert pressure in all directions.
Liquids and gases apply pressure in all directions, not just in one direction.
Explanation:
Particles in liquids and gases move freely, so they push on all sides of the container.
Examples:
- Water pushes on the walls, bottom, and top of a container
- Air pressure acts in every direction around us
Important Concepts
1. Force
- A push or pull acting on an object.
- Can change motion, direction, speed, or shape.
2. Pressure
Pressure is defined as force acting per unit area.
Formula
$$\boxed{\text{Pressure}=\frac{\text{Force}}{\text{Area}}}$$
SI Unit
Pascal (Pa)
3. Contact Forces
These forces require physical contact.
Examples:
- Muscular force
- Frictional force
4. Non-contact Forces
These forces act without physical contact.
Examples:
- Gravitational force
- Magnetic force
- Electrostatic force
5. Force and Pressure Units
| Quantity | SI Unit |
| Force | Newton (N) |
| Pressure | Pascal (Pa) |
Related Practice Questions
- Define force with one real-life example.
- What is pressure? Write its formula.
- Differentiate between contact and non-contact forces.
- Give two examples each of contact and non-contact forces.
- Why do liquids exert pressure in all directions?
Mini Quiz Challenge
True or False
- Liquids exert pressure only at the bottom of a container.
- Pressure is equal to force divided by area.
- Muscular force is a contact force.
- Newton is the SI unit of force.
- Magnetic force is a contact force.
Exam Tips
✔ Learn the formula for pressure carefully.
✔ Do not confuse the SI units of force and pressure.
✔ Remember that fluids exert pressure in every direction.
✔ Classify examples into contact and non-contact forces.
✔ Revise the effects of force on objects.
Quick Revision Notes
✔ Force is a push or pull.
✔ Pressure = Force ÷ Area.
✔ Liquids and gases exert pressure in all directions.
✔ Muscular force is a contact force.
✔ Magnetic and gravitational forces are non-contact forces.
✔ SI unit of force = Newton (N).
✔ SI unit of pressure = Pascal (Pa).
Common Mistakes Students Make
❌ Writing Pressure = Area ÷ Force.
❌ Confusing Newton and Pascal.
❌ Thinking liquids exert pressure only downward.
❌ Considering magnetic force as a contact force.
❌ Forgetting that force can also change the shape of an object.
Key Takeaways
- Force is a push or pull acting on an object.
- Pressure is the force acting per unit area.
- Liquids and gases exert pressure in all directions.
- Muscular force is a contact force, while magnetic and gravitational forces are non-contact forces.
- The SI unit of force is Newton (N), and the SI unit of pressure is Pascal (Pa).
Conclusion
The concepts of force and pressure explain many everyday phenomena, from pushing objects to the movement of fluids. Understanding different types of forces, the pressure formula, and their SI units helps students build a strong foundation in Physics. Regular MCQ practice improves conceptual clarity and prepares students for school and competitive examinations.
FAQs
1. What is force?
Force is a push or pull that can change the motion, direction, speed, or shape of an object.
2. What is the formula for pressure?
$$\text{Pressure}=\frac{\text{Force}}{\text{Area}}$$
3. Which force is a contact force?
Muscular force and frictional force are contact forces.
4. What is the SI unit of force?
The SI unit of force is Newton (N).
5. Why do liquids exert pressure in all directions?
The particles of liquids and gases move freely in every direction, causing pressure to act on all sides of the container.
NCERT Reference
Book: NCERT Science Class 8
Chapter: Chapter 11 – Force and Pressure
Based On: Latest NCERT Curriculum (CBSE)
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