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Physics Past Paper MCQs
Physics-I 2025 MCQs
1 / 20
For the successful operation of a heat engine, which condition should be met?
A heat engine must operate in a cycle and require a temperature difference (hot and cold reservoirs).
2 / 20
A simple pendulum is set into oscillations. The bob of the pendulum comes to rest after some time due to:
Air resistance (drag force) dissipates energy, damping the motion.
3 / 20
The viscous force ______ the relative motion between the adjacent layers of a fluid in motion. Which one of the following fits best in the sentence?
Explanation: Viscosity resists relative motion between fluid layers, opposing the flow.
4 / 20
The zeroth law of thermodynamics helps to define the term:
The zeroth law establishes thermal equilibrium, allowing the definition of temperature as a measurable quantity.
5 / 20
The angle of incidence for which polarization is maximum is called:
Explanation: The Brewster angle (polarization angle) is where reflected light is completely polarized.
6 / 20
The energy of a simple harmonic motion depends upon:
7 / 20
The tendency of rotation of the body along any axis is also called:
Torque is the rotational analogue of force, causing angular acceleration.
8 / 20
At constant pressure and Volume, the exact relation between Cp and Cv is:
For an ideal gas all are correct
9 / 20
In which process all the heat supplied is converted into work done?
In an isothermal process (constant temperature), all heat input can be converted to work (ideal case).
10 / 20
What is the change in the phase if a wave is reflected from a denser medium?
Explanation: When a wave reflects from a denser medium, it undergoes a phase shift of π radians (180°).
11 / 20
The energy of a damped oscillator:
12 / 20
The product of mass and velocity is known as:
Momentum (p) is defined as p=mv.
13 / 20
What is not the condition for the equilibrium in a three-dimensional system of axis?
Equilibrium requires the net force to be zero (∑F=0) in all directions.
14 / 20
X-rays are electromagnetic waves of wavelengths of the order of:
X-rays typically have wavelengths between 0.01 nm and 10 nm, with 0.1 nm being a common value.
15 / 20
Fermi-Dirac statistics cannot be applied to:
Fermi-Dirac statistics apply to fermions (e.g., electrons, protons), while photons follow Bose-Einstein statistics.
16 / 20
When the net wave intensity is greater than the individual intensities, the interference of the waves is said to be:
Explanation: Constructive interference occurs when waves combine to produce a larger amplitude (greater intensity).
17 / 20
Which quantity is not a state function?
Heat (Q) is path-dependent, while internal energy, pressure, and volume are state functions.
18 / 20
The internal energy of an ideal gas is ______ dependent.
For an ideal gas, internal energy depends only on temperature (U∝T).
19 / 20
The viscosity of a fluid in motion is 1 Poise. What will be its viscosity (in Poise) when the fluid is at rest?
Explanation: Viscosity is an intrinsic property of the fluid and does not change with motion or rest.
20 / 20
The light can totally pass through the polaroid only if the electric field vector vibrates ______ to the polarizing vector.
Light passes completely through a polarizer when its electric field is parallel to the polarizing axis.
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