NEET Physics: Impulses Practice Questions
14 free multiple-choice questions on Impulses (Laws of Motion) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. If the net external force acting on an object is zero, what happens to its linear momentum?
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Correct answer: B — It remains unchanged
According to the impulse-momentum theorem, if the net external force is zero, the change in momentum (Δp) is zero, meaning the momentum remains unchanged.
Q2. A force of 50 N is applied to an object for 4 seconds. What is the magnitude of the impulse delivered?
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Correct answer: D — 200 N s
Impulse (J) is calculated as Force (F) multiplied by the time interval (Δt). J = 50 N × 4 s = 200 N s.
Q3. A collision results in a large change in the momentum of the objects involved. This large change in momentum is directly related to the magnitude of the impulse exerted during the collision. Which law governs this relationship?
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Correct answer: C — Impulse-Momentum Theorem
The Impulse-Momentum Theorem states that the impulse applied to an object equals the change in its momentum. This theorem directly links the impulse to the momentum change during interactions.
Q4. If the magnitude of the force applied in a collision remains constant, how does the impulse experienced by the object change if the time interval of the force application is doubled?
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Correct answer: D — It is doubled
Impulse (J) is defined as Force (F) multiplied by the time interval (Δt). If the force is constant, doubling the time interval will double the resulting impulse (J = F × 2Δt).
Q5. Which physical quantity is directly related to the impulse exerted on a body?
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Correct answer: B — Momentum
Impulse is fundamentally the change in momentum. Therefore, the impulse applied to a body directly corresponds to the change in its momentum.
Q6. What is the SI unit of impulse?
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Correct answer: B — Newton-second
Impulse is the change in momentum, and since momentum is mass × velocity, the unit of impulse is kg · m/s, which is equivalent to Newton-second (N·s).
Q7. A net force acting on an object for a certain time results in an impulse. The magnitude of this impulse is equal to:
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Correct answer: D — Change in the object's momentum
Impulse is defined as the product of the net force applied and the time interval over which the force acts (J = F Δt). According to the Impulse-Momentum Theorem, impulse is equal to the change in momentum (Δp).
Q8. If the force applied on an object is constant, the impulse experienced by the object is directly proportional to:
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Correct answer: D — Time interval of the force
Impulse (J = F Δt) is directly proportional to the time interval (Δt) over which the force acts, assuming the force (F) is constant.
Q9. Which physical quantity is measured in Newton-seconds (N s)?
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Correct answer: D — Impulse
Impulse is mathematically defined as the product of force and time (J = F Δt). The SI unit for impulse is Newton-seconds (N s).
Q10. When a net force acts on an object over a short time period, the resulting impulse tends to be small. What factor primarily determines the magnitude of the impulse when the force is applied over a short duration?
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Correct answer: B — The duration of the force application
Since Impulse (J = F Δt) is involved, if the force is the same, a shorter time duration (Δt) results in a smaller magnitude of impulse.
Q11. Impulse is related to the change in momentum. If the impulse applied to a system is positive, it implies that the momentum of the system has:
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Correct answer: B — Increased
Impulse equals the change in momentum (Δp). A positive impulse means the momentum has increased in the direction of the applied force.
Q12. When a force acts on a body, it changes the body's momentum. This change in momentum is directly proportional to the impulse applied. Which equation represents this relationship?
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Correct answer: C — J = F × t
The definition of impulse is J = F Δt. Since Δt = t (for constant force), the relationship is J = F × t.
Q13. A moving body stops abruptly after interacting with a wall. The impulse exerted by the wall on the body is directly related to the change in the body's momentum. If the momentum change is zero, what can be inferred about the impulse?
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Correct answer: D — The impulse is zero
If the momentum change (Δp) is zero, then according to the impulse-momentum theorem, the impulse (J) applied must also be zero.
Q14. If the net external force acting on a body is zero, what is the net impulse acting on the body?
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Correct answer: C — Zero
Impulse is calculated as the integral of the force over time. If the net external force is zero (or the net force impulse is zero), the resulting impulse is zero.
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