BSc First Year (Sem 1 & 2) Physics – Daily Revision MCQ (English Medium)
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If the scalar (dot) product of two non-zero vectors is zero, what is the angle between them?
Chapter 2: Vectors: Scalar and Vector Products
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Answer: C. 90°
A·B = AB cos θ; with A and B non-zero, A·B = 0 only when cos θ = 0, i.e. θ = 90°.On level ground with no air resistance, at what angle of projection is the horizontal range of a projectile maximum?
Chapter 3: Kinematics and Projectile Motion
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Answer: B. 45°
Range R = u² sin 2θ / g is largest when sin 2θ = 1, i.e. 2θ = 90°, θ = 45°.What is the moment of inertia of a thin uniform ring of mass M and radius R about the axis through its centre, perpendicular to its plane?
Chapter 6: Rotational Motion and Moment of Inertia
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Answer: D. MR²
Every particle of a thin ring is at the same distance R from this axis, so I = ΣmR² = MR².Kepler's second law (a planet sweeps equal areas in equal times) is a direct consequence of the conservation of which quantity?
Chapter 7: Gravitation and Kepler's Laws
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Answer: C. Angular momentum
Gravity is a central force, so its torque about the Sun is zero; angular momentum stays constant and areal velocity L/2m is constant.What is the SI unit of Young's modulus?
Chapter 8: Elasticity
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Answer: A. N/m² (pascal)
Young's modulus = stress / strain; strain has no unit, so its unit is that of stress, N/m² (Pa).According to kinetic theory, if the absolute temperature of a gas is made 4 times, its rms speed becomes:
Chapter 11: Kinetic Theory of Gases
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Answer: B. 2 times
v_rms = √(3RT/M) ∝ √T, so 4 times T gives √4 = 2 times the rms speed.A Carnot engine works between a source at 500 K and a sink at 300 K. What is its efficiency?
Chapter 13: Thermodynamics
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Answer: A. 40%
η = 1 − T₂/T₁ = 1 − 300/500 = 1 − 0.6 = 0.4, i.e. 40%.For a particle in simple harmonic motion, which quantity is maximum when it passes through the mean position?
Chapter 15: Oscillations
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Answer: C. Velocity
At the mean position x = 0, so acceleration (−ω²x) and PE are zero, while velocity ω√(A² − x²) is maximum (ωA).In forced oscillations, resonance occurs when:
Chapter 17: Damped and Forced Oscillations
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Answer: A. the driving frequency equals the natural frequency of the system
At resonance the applied (driving) frequency matches the natural frequency, so the system absorbs energy best and the amplitude is largest.According to the Stefan–Boltzmann law, the total energy radiated per second per unit area by a black body is proportional to:
Chapter 20: Blackbody Radiation
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Answer: D. T⁴
E = σT⁴, where T is the absolute temperature and σ is Stefan's constant.
BSc First Year (Sem 1 & 2): MCQ in other subjects
All questions are written by PadhaiNotes in our own words from the common syllabus of Maharashtra universities (NEP). Your own university's syllabus may differ a little.