Chapter 1: Laws of Motion — Online MCQ Test
SCIENCE · CLASS 10th · Tamil Nadu State Board
Practice Chapter 1: Laws of Motion with a free chapter-wise online MCQ test.
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....
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Chapter 1: Laws of Motion — Important Questions & Answers
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.
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.
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.
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.
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.
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.