Chapter Exam

Chapter-2 Forces and Pressure — Online MCQ Test

Q: Which of the following is a contact force?

Answer: C. Frictional force — Frictional force acts only when two surfaces are in contact. Magnetic, gravitational, and electrostatic forces can act without direct contact.

Q: Pressure is defined as force acting on what?

Answer: A. Area — Pressure is the force acting per unit area. So, pressure depends on both the applied force and the area over which it acts.

Q: Why do sharp knives cut better than blunt knives?

Answer: B. They act over a smaller area — A sharp knife has a smaller area of contact, so the same force produces greater pressure. Greater pressure helps in cutting.

Q: A pin, a needle, and a nail are all pointed at one end. This shape helps them because it ________.

Answer: B. decreases area and increases pressure — A pointed end reduces the area of contact. For the same applied force, a smaller area produces greater pressure, making them easier to pierce.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-2 Forces and Pressure with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: force pressure applications Covers types of forces pressure in solids liquids and gases with applications. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-2 Forces and Pressure — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-2 Forces and Pressure, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a contact force?

A. Magnetic force
B. Gravitational force
C. Frictional force ✓
D. Electrostatic force

Answer: C. Frictional force
Frictional force acts only when two surfaces are in contact. Magnetic, gravitational, and electrostatic forces can act without direct contact.

Pressure is defined as force acting on what?

A. Area ✓
B. Mass
C. Time
D. Distance

Answer: A. Area
Pressure is the force acting per unit area. So, pressure depends on both the applied force and the area over which it acts.

Why do sharp knives cut better than blunt knives?

A. They apply less force
B. They act over a smaller area ✓
C. They have more mass
D. They create less pressure

Answer: B. They act over a smaller area
A sharp knife has a smaller area of contact, so the same force produces greater pressure. Greater pressure helps in cutting.

A student pushes a wall, but the wall does not move. Which statement is correct?

A. No force is applied
B. Force is applied, but there is no effect on motion ✓
C. The wall exerts no resistance
D. The force becomes zero immediately

Answer: B. Force is applied, but there is no effect on motion
A force may be applied even if it does not produce motion. Here, the wall does not move because the applied force is insufficient to change its state of rest.

A pin, a needle, and a nail are all pointed at one end. This shape helps them because it ________.

A. increases area and decreases pressure
B. decreases area and increases pressure ✓
C. decreases force and decreases pressure
D. increases force and decreases area

Answer: B. decreases area and increases pressure
A pointed end reduces the area of contact. For the same applied force, a smaller area produces greater pressure, making them easier to pierce.

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