CSS Physics MCQs 2025
CSS Physics 2025 MCQs – Paper I
Q1: The energy of a simple harmonic motion depends upon:
A: Mass
B: Frequency
C: Both (A) & (B)
D: None of these
Q2: The zeroth law of thermodynamics helps to define the term:
A: Temperature
B: Pressure
C: Volume
D: Density
Q3: What is the change in the phase if a wave is reflected from a denser medium?
A: 3π
B: 0
C: π
D: 2π
Q4: The light can totally pass through the polaroid only if the electric field vector vibrates _____ to the polarizing vector.
A: Antiparallel
B: Parallel
C: Opposite
D: None of these
Q5: When the net wave intensity is greater than the individual intensities the interference of the waves is said to be:
A: Constructive
B: Destructive
C: Both (A) & (B)
D: None of these
Q6: The angle of incidence for which polarization is maximum is called:
A: Scattering angle
B: Angle of reflection
C: Polarization angle (Brewster\'s Angle)
D: None of these
Q7: X-rays are electromagnetic waves of wavelengths of the order of:
A: 1 nm
B: 0.1 nm (1 Angstrom)
C: 2 nm
D: 100 nm
Q8: The viscous force _____ the relative motion between the adjacent layers of a fluid in motion. Which one of the flowing fits best in the sentence?
A: Opposes
B: Never affects
C: Facilitates
D: May effect under certain conditions
Q9: The viscosity of a fluid in motion is 1 Poise. What will be it\'s viscosity (in Poise) when the fluid is at rest?
A: 0
B: 0.5
C: 1
D: 2
Q10: For the successful operation of heat engine, which condition should be met?
A: Cyclic process
B: Operated at certain temperature difference (Source & Sink)
C: Both (A) & (B)
D: None of these
Q11: Which quantity is not a state function?
A: Internal energy
B: Pressure
C: Heat
D: Volume
Q12: Fermi-Dirac statistics cannot be applied to:
A: Electrons
B: Photons
C: Fermions
D: Proton
Q13: In which process all the heat supplied is converted into work done?
A: Isothermal
B: Isochoric
C: Isobaric
D: Isentropic
Q14: At constant pressure and Volume, exact relation between Cp and Cv is:
A: Cp>Cv
B: Cp/Cv>1
C: Cp - Cv=R
D: All of these
Q15: The internal energy of an ideal gas is dependent on:
A: Pressure
B: Temperature
C: Volume
D: All of these
Q16: What is not the condition for the equilibrium in three dimensional system of axis?
A: Fx=0
B: Fy=0
C: Fz=0
D: ΣF≠0
Q17: The tendency of rotation of the body along any axis is also called:
A: Moment of inertia
B: Moment of couple
C: Torque
D: Force
Q18: A simple pendulum is set into oscillations. The bob of the pendulum comes to rest after some time due to:
A: Friction of air (Damping)
B: Its mass
C: Tension in the string
D: Gravity
Q19: The energy of a damped oscillator:
A: Decreases linearly with time
B: Increases linearly with time
C: Decreases exponentially with time
D: Increases exponentially with time
Q20: The product of mass and velocity is known as:
A: Work
B: Moment
C: Impulse
D: Momentum
CSS Physics 2025 MCQs – Paper II
Q1: A charge moving in a uniform static magnetic field experiences:
A: A force perpendicular to magnetic field and velocity
B: Increase in momentum
C: Decrease in momentum
D: Decrease in velocity
Q2: The same energy alpha particles and electrons are associated. Their De Broglie wavelengths are:
A: Equal
B: Longer than electrons
C: Smaller than electrons
D: None of these
Q3: The mass deficit defines:
A: Nuclear binding energy
B: Nuclear Quadrupole moment
C: Shape of the nucleus
D: None of these
Q4: In nuclear physics, the magic number defines:
A: Nuclear binding energy
B: Relatively exceptionally stable nuclei
C: Radioactivity
D: None of these
Q5: The Zeeman effect is due to the interaction of:
A: External magnetic field and total magnetic moment of the specimen
B: External electric field and magnetic field of specimen
C: L-S coupling
D: None of these
Q6: A photon having the same energy as an electron has a wavelength ______ than the electron\'s De Broglie wavelength.
A: Shorter
B: Longer
C: Equal
D: None of these
Q7: In Lorentz transformation, motion along one axis implies that coordinates on ______ axes remain zero (invariant).
A: One axis
B: Two axes
C: Three axes
D: None of these
Q8: Gauss\'s law is applicable on the charges which are:
A: Closely distributed in space
B: Sparsely distributed in space
C: Enclosed by a broken surface
D: Enclosed by a closed surface
Q9: The ratio between the angular momentum (L) and orbital magnetic moment vector (μ) of the first orbital electron of Hydrogen Atoms is known as:
A: Total Magnetic Moment
B: Bohr Magneton
C: Magnetic Moment
D: None of these
Q10: The cyclotron is a device which is primarily used to:
A: Accelerate sub-atomic particles
B: To generate neutrons
C: To generate electrons
D: To generate protons
Q11: The rate of change of current in a coil (dI/dt) is proportional to:
A: Induced emf (ε)
B: Voltage (V)
C: Resistance (R)
D: None of these
Q12: The charging and discharging behavior of an ideal RLC circuit is:
A: Simple harmonic (Oscillatory)
B: Linear
C: Elliptical
D: None of these
Q13: The Lorentz force is given by:
A: F = q(v*B)
B: φ = ∮A.dA
C: qF_q (v*B)
D: None of these
Q14: The Poynting vector represents:
A: The rate and direction of electromagnetic energy transferred in space
B: The amount of electromagnetic energy transferred in different forms of energy
C: Loss of electromagnetic energy in a medium
D: The flow of thermal energy in a certain direction.
Q15: The De Broglie wave-particle duality is said to be the foundation of the uncertainty principle because:
A: The velocities of the particles were very high
B: The mass could not attain the velocity of light
C: The mass increases at velocities comparable to the velocity of light
D: The uncertainty in position of the moving mass
Q16: The relation between half-life (T_1/2) and mean life (τ) is:
A: Inversely proportional
B: Directly proportional
C: Equal
D: Half
Q17: The concept of mutual frame of reference (Reduced Mass) was used in:
A: Reduced mass correction in spectroscopy (Bohr Model)
B: Radioactivity
C: Relative nuclear stability
D: None of these
Q18: The Ultraviolet catastrophe means:
A: The spectral energy concentration towards longer wavelength
B: The spectral energy concentration at the middle of the spectrum
C: The spectral energy concentration towards shorter wave side (Infinity)
D: None of these
Q19: As per quantum physics, the observables \'E\' (Energy) and ______ cannot be simultaneously measured with hundred percent accuracy.
A: p_x
B: t (Time)
C: x
D: None of these
Q20: The theory of relativity predicts that at velocities comparable to the velocity of light, the moving mass appears to:
A: Increase
B: Decrease
C: Remains the same
D: None of these