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DSSSB TGT Laws of Motion — practice questions

Explore 17 free Laws of Motion questions in DSSSB TGT Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Laws of Motion questions and exercises with answers

Showing questions 1–17 of 17.

The SI unit of force is the:Read the answer and worked solution →Two equal and opposite forces act on a rope in a tug of war. The rope does not move because the forces are:Read the answer and worked solution →Newton's first law states that an object at rest stays at rest, and an object in motion continues at constant velocity, UNLESS:Read the answer and worked solution →Newton's SECOND law of motion can be stated as:Read the answer and worked solution →A 5 kg object is acted upon by a net force of 20 N. Its acceleration is:Read the answer and worked solution →What force is needed to give a 10 kg object an acceleration of 5 m/s²?Read the answer and worked solution →A train brakes from 30 m/s to rest in 15 seconds. If the mass of the train is 20,000 kg, the BRAKING FORCE is:Read the answer and worked solution →The TENDENCY of an object to resist a change in its state of motion is called:Read the answer and worked solution →The unit of mass is:Read the answer and worked solution →On the Moon (where gravity is weaker than on Earth), an astronaut's MASS:Read the answer and worked solution →A 10 kg object has a weight of approximately ___ on Earth (taking g = 10 m/s²):Read the answer and worked solution →A boy of mass 30 kg jumps off a low wall with negligible initial velocity. After 1 second of free fall, his velocity is approximately (g = 10 m/s²):Read the answer and worked solution →A 5 kg object slides on a rough surface and experiences a friction force of 8 N. Its DECELERATION is:Read the answer and worked solution →A rocket of mass 5000 kg accelerates upward at 4 m/s². Taking g = 10 m/s², the THRUST (upward force) from the rocket engines must equal:Read the answer and worked solution →In which scenario is the force of FRICTION the maximum on a 50 kg box?Read the answer and worked solution →CLASS10 · Physics · Magnetic Effect — Quick True/FalseRead the answer and worked solution →True or false on magnetism (CBSE Cl 10)Read the answer and worked solution →

Worked practice questions

The SI unit of force is the:

  1. Pascal
  2. Joule
  3. Watt
  4. Newton
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Correct answer: D. Newton

Force is measured in newtons (N). 1 N is defined as the force that produces an acceleration of 1 m/s² in a body of mass 1 kg (F = ma). Joule is work, pascal is pressure, watt is power.

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Two equal and opposite forces act on a rope in a tug of war. The rope does not move because the forces are:

  1. Magnetic
  2. Frictional
  3. Unbalanced
  4. Balanced
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Correct answer: D. Balanced

When two forces are equal in magnitude but opposite in direction, the NET force is zero — they are balanced. With no net force, the rope's state of motion does not change (Newton's first law: at rest, stays at rest).

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Newton's first law states that an object at rest stays at rest, and an object in motion continues at constant velocity, UNLESS:

  1. It is observed
  2. Time passes
  3. An unbalanced (net) external force acts on it
  4. It is heavy
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Correct answer: C. An unbalanced (net) external force acts on it

**Newton's first law (law of inertia):** an object's state of motion changes only if there is an unbalanced external force. With zero net force, velocity stays constant (which includes zero velocity = at rest). This is why we keep moving forward when a bus stops suddenly (inertia).

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More Physics topics

The Human Eye and the Colourful WorldSoundSound WavesElectricitySources of EnergyMagnetic Effects of Electric CurrentMotionForce