For one mole of an ideal monatomic gas, the ratio Cp/Cv is:

The correct answer is B: 1.67. For monatomic gas: Cv = (3/2)R and Cp = (5/2)R. Therefore Cp/Cv = (5/2)/(3/2) = 5/3 ≈ 1.67

In Bohr's model, the angular momentum of electron in nth orbit is:

The correct answer is C: n(h/2π). Bohr's quantization condition: L = mvr = n(h/2π) = nℏ, where n = 1, 2, 3...

A rotating body has moment of inertia I and angular acceleration α. The rotational kinetic energy increases at rate:

The correct answer is B: Iαω. KE = ½Iω². dKE/dt = Iω(dω/dt) = Iωα. Since τ = Iα and dKE/dt = τω = Iαω

A ball thrown upward returns to same height in 4s. Initial velocity is: (g = 10 m/s²)

The correct answer is C: 20 m/s. Time to max height = 2s. u = gt = 10(2) = 20 m/s

An open system differs from a closed system in that:

The correct answer is A: It can exchange both mass and energy with surroundings. An open system allows both mass and energy exchange with surroundings (e.g., a boiling kettle), while a closed system allows only energy exchange

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JEE Physics

Physics questions for JEE Main — Mechanics, Electrostatics, Optics, Modern Physics.

301 Q 9 Topics Take Mock Test

Difficulty: All Easy Medium Hard 301–301 of 301

Topics in JEE Physics

All Mechanics 100 Thermodynamics 100 Electrostatics 100 Current Electricity 100 Magnetism 100 Optics 100 Modern Physics 100 Semiconductors 100 Waves 100

Q.301 Easy Mechanics

A particle moves in a straight line with velocity v = 3t² + 2t m/s. What is its acceleration at t = 2s?

A 14 m/s²

B 16 m/s²

C 18 m/s²

D 20 m/s²

Correct Answer: A. 14 m/s²

EXPLANATION

a = dv/dt = d(3t² + 2t)/dt = 6t + 2. At t = 2s, a = 6(2) + 2 = 14 m/s²

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