Previous IIT-JEE Physics Questions & Answers
Complete Mechanics Coverage
(Laws of Motion to Mechanical Waves)
Questions are selected from previous IIT-JEE / JEE Advanced papers or are identical in concept, structure, and difficulty.
Laws of Motion
Q1.
A block of mass m is placed on a smooth horizontal surface. A constant force F acts on it. Find the displacement in time t.
Answer: (Ft²) / (2m)
Q2.
A block rests on a rough incline. At what angle does it just begin to slide?
Answer: tanθ = μs
Work, Energy and Power
Q3.
A particle of mass m moves under a constant force. Find the work done in changing speed from u to v.
Answer: (1/2)m(v² − u²)
Q4.
A block slides on a rough surface and comes to rest. What happens to the initial kinetic energy?
Answer: Converted into heat due to friction.
Centre of Mass
Q5.
Two particles of masses m and 2m move with velocities v and −v. Find velocity of centre of mass.
Answer: −v/3
Q6.
In absence of external force, how does COM of a system move?
Answer: With constant velocity.
Collisions
Q7.
A perfectly inelastic collision occurs. Which physical quantity is always conserved?
Answer: Linear momentum
Q8.
Two bodies collide elastically. What remains conserved?
Answer: Momentum and kinetic energy
Rotational Mechanics
Q9.
A torque τ produces angular acceleration α in a rigid body. What is the relation?
Answer: τ = Iα
Q10.
A rolling body has which types of motion?
Answer: Translational and rotational
Gravitation
Q11.
Find the variation of gravitational field with distance from Earth.
Answer: g ∝ 1/r²
Q12.
What is the condition for a satellite to remain in circular orbit?
Answer: Gravitational force provides centripetal force
Oscillations & SHM
Q13.
At which position is velocity maximum in SHM?
Answer: Mean position
Q14.
At which position is acceleration maximum in SHM?
Answer: Extreme positions
Mechanical Waves
Q15.
In a wave motion, which quantity is transported?
Answer: Energy
Q16.
What determines the frequency of a wave?
Answer: Source of vibration
Mixed Advanced (IIT Favourite)
Q17.
A block attached to a spring performs SHM on a rough surface. Which quantity decreases with time?
Answer: Amplitude
Q18.
A satellite loses energy. What happens to its orbital radius?
Answer: Decreases
Q19.
Two waves interfere destructively. What is the condition?
Answer: Phase difference = π
Q20.
In which frame is collision analysis easiest?
Answer: Centre of mass frame
✔ Previous IIT-JEE Physics – Complete Mechanics Coverage
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