Every Book Back multiple-choice question from Laws of Motion (10th Standard Science, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
Inertia of a body depends on
- A. weight of the object
- B. acceleration due to gravity of the planet
- C. mass of the objectCorrect
- D. Both a & b
Explanation. Inertia is the inherent property of a body to resist changes in its state of rest or motion, and it is directly proportional to the mass of the object.
Q2
Impulse is equals to
- A. rate of change of momentum
- B. rate of force and time
- C. change of momentumCorrect
- D. rate of change of mass
Explanation. Impulse is defined as a large force acting for a very short duration. According to Newton's laws, impulse is equal to the total change in momentum.
Q3
Newton's III law is applicable
- A. for a body is at rest
- B. for a body in motion
- C. both a & bCorrect
- D. only for bodies with equal masses
Explanation. Newton's third law of motion, which states that every action has an equal and opposite reaction, applies universally to all bodies whether they are at rest or in motion.
Q4
Plotting a graph for momentum on the Y-axis and time on X-axis. slope of momentum-time graph gives
- A. Impulsive force
- B. Acceleration
- C. ForceCorrect
- D. Rate of force
Explanation. According to Newton's second law, the rate of change of linear momentum with respect to time is equal to the applied force. Therefore, the slope of the momentum-time graph gives force.
Q5
In which of the following sport the turning of effect of force used
- A. swimming
- B. tennis
- C. cyclingCorrect
- D. hockey
Explanation. In cycling, the turning effect of force, or torque, is applied to the pedals to rotate the wheels and propel the bicycle forward.
Q6
The unit of 'g' is m s-2. It can be also expressed as
- A. cms-1
- B. Nkg-1Correct
- C. Nm2kg-1
- D. cm2s-2
Explanation. Acceleration due to gravity is the force experienced per unit mass. Since acceleration is force divided by mass, its unit can be written as newtons per kilogram.
Q7
One kilogram force equals to
- A. 9.8 dyne
- B. 9.8 × 10⁴ N
- C. 98 × 10⁴ dyneCorrect
- D. 980 dyne
Explanation. One kilogram force equals 9.8 Newtons. Since one Newton equals \(10^5\) dynes, 9.8 Newtons equals 9.8 times \(10^5\) dynes, which is equal to 98 times \(10^4\) dynes.
Q8
The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be____kg
- A. 4 M
- B. 2M
- C. M/4
- D. MCorrect
Explanation. Mass is an intrinsic property of matter that represents the quantity of matter in a body. It remains constant everywhere in the universe, regardless of gravity.
Q9
If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will
- A. decrease by 50%
- B. increase by 50%
- C. decrease by 25%
- D. increase by 300%Correct
Explanation. Weight is proportional to gravity, which is inversely proportional to the square of the radius. Halving the radius increases gravity and weight by four times, representing a 300% increase.
Q10
To project the rockets which of the following principle(s) is /(are) required?
- A. Newton's third law of motion
- B. Newton's law of gravitation
- C. law of conservation of linear momentum
- D. both a and cCorrect
Explanation. Rocket propulsion is based on Newton's third law of motion and the law of conservation of linear momentum. Exhaust gases push downwards, propelling the rocket upwards.
About these Laws of Motion questions
These are the Book Back multiple-choice questions for Laws of Motion from the Tamil Nadu State Board (Samacheer Kalvi) 10th Standard Science syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Laws of Motion?
This chapter has 10 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 10th Standard Science MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Laws of Motion book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
