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Physics Past Paper MCQs
Physics-I 2024 MCQs
1 / 20
Optically active crystals rotate the:
Optically active materials (e.g., quartz) rotate the plane of polarization of light passing through them.
2 / 20
Wavelength of an incident light when it is incident normally on a diffraction grating, having 3000 lines per centimeter and angular separation of 10° is:
Grating equation: d sinθ = nλ d = 1/3000 cm = 3.33×10⁻⁶ m For n=1: λ = d sinθ = 3.33×10⁻⁶ × sin10° ≈ 580 nm
3 / 20
A system consisting of two particles moves on a plane. Then the degree of freedom is:
For N particles moving in a plane, the degrees of freedom are 2N (each particle has x and y coordinates). For 2 particles: Degrees of freedom = 2 × 2 = 4
4 / 20
When travelling wave is a sin or cos function of (x+Vt) is called:
A wave of form f(x±Vt) represents a plane progressive wave moving in ±x direction.
5 / 20
When the movable mirror of a Michaelson Interferometer is shifted through 0.0589 mm, 200 fringes cross the field. What is the wavelength of the light?
6 / 20
What is the magnitude of the vector, 12i − 8j − 24k?
7 / 20
The efficiency of a heat engine working between the freezing point and boiling point of water is:
Carnot efficiency = 1 - T_cold/T_hot = 1 - (273K/373K) ≈ 0.268 or 26.8%
8 / 20
Moment of inertia of solid sphere is:
9 / 20
The escape velocity from the surface of the earth is approximately equal to:
Escape velocity from Earth's surface is a standard value: 11.2 km/s.
10 / 20
The value of relative permittivity for all the dielectrics is:
Relative permittivity (dielectric constant) is always >1 for dielectric materials.
11 / 20
Projection of vector A in the direction of x-axis is represented by the angle of:
The x-component of a vector is given by Aₓ = |A|cosθ, where θ is the angle with the x-axis.
12 / 20
A particle on the trough of a wave at any instant will come to the mean position after a time:
From trough to mean position is 1/4 of the period (T).
13 / 20
The dimensions of work are:
Work = Force × Distance = [MLT⁻²][L] = [ML²T⁻²]
14 / 20
A sound source of frequency 600 Hz is moving towards an observer with velocity 20 m/s. The speed of sound is 340 m/s. The frequency heard by observer will be:
15 / 20
Which of the following has the highest value of surface tension?
Mercury has exceptionally high surface tension (≈465 mN/m) compared to water (72 mN/m).
16 / 20
The linear thermal coefficient of a solid is less than its volume thermal expansion coefficient by a factor of:
17 / 20
A body is thrown vertically upwards from the ground with a speed of 980 cm/sec. It will rise to a height of:
18 / 20
The frequency of 2nd pendulum is:
A seconds pendulum has a period of 2 seconds (time for one complete swing). Frequency f = 1/T = 1/2 = 0.5 Hz.
19 / 20
A skater moves with a constant velocity of 12 km/s. If her momentum is 600 kgm/s, what is its mass?
First convert velocity: 12 km/s = 12,000 m/s Momentum p = mv ⇒ m = p/v = 600/12,000 = 0.05 kg
20 / 20
Radial component of velocity for a particle moving in a circular path is:
In uniform circular motion, the radial (centripetal) component of velocity is always zero because the velocity vector is entirely tangential. The particle moves perpendicular to the radius.
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