Chapter Exam

Chapter 1: Laws of Motion — Online MCQ Test

Q: What is the SI unit of linear momentum?

Answer: B. kg m s^-1 — Linear momentum is the product of mass (kg) and velocity (m/s), giving it the SI unit of kg m s^-1.

Q: Which of Newton's laws of motion provides a qualitative definition of force?

Answer: A. Newton's First Law — Newton's First Law defines force as an external agency that changes or tends to change the state of rest or uniform motion of a body.

Q: An athlete runs a short distance before taking a long jump. This helps the athlete to gain:

Answer: B. Inertia of motion — Running before jumping allows the athlete to acquire inertia of motion, helping them jump a longer distance.

Q: Two objects of masses m1 and m2 are separated by a distance d. If the distance between them is doubled, the gravitational force between them becomes:

Answer: D. One-fourth — Gravitational force is inversely proportional to the square of the distance (F ∝ 1/d^2). Doubling the distance decreases the force to 1/2^2 = 1/4 of its original value.

Q: If the mass of a planet is twice that of the Earth and its radius is three times that of the Earth, what is the ratio of acceleration due to gravity on that planet (gp) to that on Earth (ge)?

Answer: B. 2 : 9 — Since g = GM/R^2, ratio gp/ge = (Mp/Me) * (Re/Rp)^2 = 2 * (1/3)^2 = 2/9, so the ratio is 2 : 9.

SCIENCE · CLASS 10th · Tamil Nadu State Board

Practice Chapter 1: Laws of Motion with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 10th SCIENCE. This chapter covers: This chapter covers force motion linear momentum and Newton three laws of motion. Students study gravitational force impulse weightlessness and practical applications of conservati.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 1: Laws of Motion — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 10th SCIENCE — Chapter 1: Laws of Motion, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of linear momentum?

A. kg m s^-2
B. kg m s^-1 ✓
C. N m
D. kg m^2 s^-1

Answer: B. kg m s^-1
Linear momentum is the product of mass (kg) and velocity (m/s), giving it the SI unit of kg m s^-1.

Which of Newton's laws of motion provides a qualitative definition of force?

A. Newton's First Law ✓
B. Newton's Second Law
C. Newton's Third Law
D. Universal Law of Gravitation

Answer: A. Newton's First Law
Newton's First Law defines force as an external agency that changes or tends to change the state of rest or uniform motion of a body.

An athlete runs a short distance before taking a long jump. This helps the athlete to gain:

A. Inertia of rest
B. Inertia of motion ✓
C. Inertia of direction
D. Moment of force

Answer: B. Inertia of motion
Running before jumping allows the athlete to acquire inertia of motion, helping them jump a longer distance.

Two objects of masses m1 and m2 are separated by a distance d. If the distance between them is doubled, the gravitational force between them becomes:

A. Double
B. Four times
C. Half
D. One-fourth ✓

Answer: D. One-fourth
Gravitational force is inversely proportional to the square of the distance (F ∝ 1/d^2). Doubling the distance decreases the force to 1/2^2 = 1/4 of its original value.

If the mass of a planet is twice that of the Earth and its radius is three times that of the Earth, what is the ratio of acceleration due to gravity on that planet (gp) to that on Earth (ge)?

A. 2 : 3
B. 2 : 9 ✓
C. 4 : 9
D. 9 : 2

Answer: B. 2 : 9
Since g = GM/R^2, ratio gp/ge = (Mp/Me) * (Re/Rp)^2 = 2 * (1/3)^2 = 2/9, so the ratio is 2 : 9.

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