CSS Physics MCQs 2020
CSS Physics 2020 MCQs – Paper I
Q1: The vector product of two vectors is zero when:
A: They are perpendicular
B: They are parallel or anti-parallel
C: They are unit vectors
D: None of these
Q2: A body moving with uniform speed in a circle has:
A: Constant velocity
B: Constant acceleration (towards center)
C: Zero acceleration
D: Varying mass
Q3: The time rate of change of angular momentum is equal to:
A: Force
B: Torque
C: Power
D: Energy
Q4: If the Earth stops rotating, the value of \'g\' at the equator will:
A: Increase
B: Decrease
C: Remain same
D: Become zero
Q5: A projectile is thrown at an angle of 45° to achieve:
A: Maximum Height
B: Maximum Horizontal Range
C: Minimum Time of Flight
D: Maximum Speed
Q6: Stokes\' Law holds good for:
A: Large bodies moving fast
B: Bodies moving in vacuum
C: Small spherical bodies moving slowly in a viscous fluid
D: Ideal fluids only
Q7: For an ideal gas, the internal energy depends only on:
A: Pressure
B: Volume
C: Temperature
D: Mass
Q8: The area under the Pressure-Volume (PV) graph represents:
A: Entropy
B: Work Done
C: Power
D: Internal Energy
Q9: The efficiency of a diesel engine is roughly:
A: 25%
B: 35% to 40%
C: 80%
D: 10%
Q10: The velocity of sound in vacuum is:
A: 332 m/s
B: 3 x 10^8 m/s
C: Zero (Sound needs a medium)
D: Infinite
Q11: When a source of sound moves towards a stationary observer, the apparent frequency:
A: Increases
B: Decreases
C: Remains same
D: Becomes zero
Q12: The phenomenon of interference is shown by:
A: Longitudinal waves only
B: Transverse waves only
C: Both Longitudinal and Transverse waves
D: None of these
Q13: Diffraction of light is effectively observed when the obstacle size is:
A: Very large compared to wavelength
B: Comparable to the wavelength of light
C: Very small
D: Infinite
Q14: Polaroid glasses are used to reduce:
A: Glare (Polarization)
B: Intensity
C: Color
D: Reflection
Q15: According to Special Theory of Relativity, the mass of a particle at speed of light becomes:
A: Zero
B: Infinite
C: Constant
D: Double
Q16: Which quantity is invariant in Special Relativity?
A: Time
B: Length
C: Mass
D: Speed of Light (c)
Q17: One Fermi is equal to:
A: 10^-12 m
B: 10^-15 m
C: 10^-9 m
D: 10^-6 m
Q18: The unit of Power is:
A: Joule
B: Watt (Joule/sec)
C: Newton
D: Horsepower-hour
Q19: Specific heat capacity is the heat required to raise the temperature of:
A: Whole body by 1°C
B: Unit mass by 1°C (or 1 K)
C: Unit volume by 1°C
D: None of these
Q20: Angular momentum is conserved if:
A: Net External Torque is zero
B: Net Force is zero
C: Velocity is constant
D: Energy is constant
CSS Physics 2020 MCQs – Paper II
Q1: The electric field inside a hollow charged metal sphere is:
A: Uniform
B: Infinite
C: Zero
D: Variable
Q2: The capacitance of a parallel plate capacitor increases if:
A: Area of plates is decreased
B: Distance between plates is decreased
C: Dielectric is removed
D: Voltage is increased
Q3: Magnetic lines of force originate from:
A: North Pole
B: South Pole
C: Center of magnet
D: Infinity
Q4: An electron entering a magnetic field parallel to the field lines experiences:
A: Maximum force
B: Zero force
C: Circular motion
D: Spin
Q5: Root Mean Square (RMS) value of AC current is equal to:
A: Peak Current I_0
B: 0.707*I_0
C: 0.5*I_0
D: 2*I_0
Q6: The reactance of a capacitor (X_c) is inversely proportional to:
A: Voltage
B: Frequency
C: Inductance
D: Resistance
Q7: In a step-down transformer, the number of turns in the primary coil is:
A: Greater than secondary coil
B: Less than secondary coil
C: Equal to secondary coil
D: Zero
Q8: Intrinsic semiconductors are:
A: Doped with impurity
B: Pure semiconductors
C: Metals
D: Insulators
Q9: A Zener Diode is primarily used for:
A: Rectification
B: Voltage Stabilization (Regulation)
C: Amplification
D: Oscillation
Q10: A Zener Diode is primarily used for:
A: Rectification
B: Voltage Stabilization (Regulation)
C: Amplification
D: Oscillation
Q11: In a transistor, the base current (I_b) is usually about:
A: 50% of Emitter current
B: Less than 5% of Emitter current
C: Equal to Collector current
D: Zero
Q12: The gain of an ideal Op-Amp is:
A: 100
B: 1000
C: Infinite
D: Zero
Q13: The threshold frequency in Photoelectric effect depends on:
A: Intensity of light
B: Nature of the metal
C: Time of exposure
D: Velocity of light
Q14: Compton effect proves that photons have:
A: Momentum
B: Charge
C: Mass
D: Magnetic moment
Q15: Wave nature of electrons was experimentally verified by:
A: Einstein
B: Davisson and Germer
C: Bohr
D: Rutherford
Q16: According to Bohr\'s model, the angular momentum of an electron is quantized as:
A: nh
B: nh / 2π
C: h / λ
D: mc^2
Q17: Isotopes differ in:
A: Number of protons
B: Number of neutrons
C: Chemical properties
D: Atomic number
Q18: Radioactive decay obeys:
A: Linear Law
B: Inverse Square Law
C: Exponential Law
D: Power Law
Q19: The energy source of stars (like the Sun) is:
A: Fission
B: Proton-Proton Chain (Fusion)
C: Chemical burning
D: Gravitational collapse
Q20: A NOT gate is also known as:
A: Buffer
B: Inverter
C: Convertor
D: Adder