Physics (School & Undergraduate)

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Q. In which process does the entropy of a system decrease?
  • A. Isothermal expansion
  • B. Adiabatic compression
  • C. Isobaric heating
  • D. Isothermal compression
Q. In which situation does light undergo total internal reflection?
  • A. When it passes from air to water
  • B. When it passes from water to air at an angle greater than the critical angle
  • C. When it passes from glass to air at any angle
  • D. When it passes from air to glass
Q. In which situation does total internal reflection occur?
  • A. When light travels from a denser to a rarer medium
  • B. When light travels from a rarer to a denser medium
  • C. When light is absorbed
  • D. When light is reflected
Q. In Young's double-slit experiment, what causes the formation of interference patterns?
  • A. Reflection of light
  • B. Refraction of light
  • C. Superposition of waves
  • D. Diffraction of waves
Q. In Young's double-slit experiment, what is the condition for constructive interference?
  • A. d sin(θ) = (m + 0.5)λ
  • B. d sin(θ) = mλ
  • C. d sin(θ) = (m - 0.5)λ
  • D. d sin(θ) = 0
Q. Two cars are moving towards each other, one at 50 km/h and the other at 70 km/h. What is the speed of one car relative to the other?
  • A. 20 km/h
  • B. 120 km/h
  • C. 50 km/h
  • D. 70 km/h
Q. Two charges, +4 µC and -4 µC, are placed 1 m apart. What is the net electric field at the midpoint between the charges?
  • A. 0 N/C
  • B. 8.99 N/C
  • C. 4.49 N/C
  • D. 17.98 N/C
Q. Two trains are moving towards each other on parallel tracks. Train A is moving at 90 km/h and Train B at 70 km/h. What is the speed of Train B relative to Train A?
  • A. 20 km/h
  • B. 70 km/h
  • C. 90 km/h
  • D. 160 km/h
Q. Using Kirchhoff's Voltage Law, if a loop has a 12V source and two resistors of 3Ω and 4Ω, what is the voltage drop across the 3Ω resistor?
  • A. 4.29V
  • B. 5.14V
  • C. 3.43V
  • D. 6.0V
Q. Using Kirchhoff's Voltage Law, what is the voltage drop across a 10Ω resistor if the total voltage in the loop is 20V and there is a 5Ω resistor in series?
  • A. 10V
  • B. 15V
  • C. 5V
  • D. 20V
Q. What does the Heisenberg Uncertainty Principle state?
  • A. Energy and mass are interchangeable
  • B. The position and momentum of a particle cannot both be precisely known
  • C. Electrons can exist in multiple states simultaneously
  • D. Light behaves both as a wave and a particle
Q. What does the photoelectric effect demonstrate?
  • A. Light behaves only as a wave.
  • B. Light can be absorbed by matter.
  • C. Light has particle-like properties.
  • D. Light cannot cause electron emission.
Q. What does the second law of thermodynamics state about entropy?
  • A. Entropy can decrease in an isolated system
  • B. Entropy remains constant in reversible processes
  • C. Entropy of an isolated system always increases
  • D. Entropy is a measure of energy
Q. What does the term 'mean free path' refer to in the context of gases?
  • A. The average distance traveled by a molecule between collisions
  • B. The average speed of gas molecules
  • C. The average time between collisions
  • D. The average kinetic energy of gas molecules
Q. What effect does temperature have on the speed of sound in air?
  • A. Increases with temperature
  • B. Decreases with temperature
  • C. No effect
  • D. Depends on humidity
Q. What happens to the acceleration of an object if the mass is doubled while the force remains constant?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. What happens to the angular momentum of a rigid body if no external torque acts on it?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. What happens to the capacitance of a capacitor if the plate area is doubled while keeping the distance constant?
  • A. It doubles
  • B. It halves
  • C. It quadruples
  • D. It remains the same
Q. What happens to the charge (Q) on a capacitor when it discharges through a resistor (R)?
  • A. Q decreases exponentially
  • B. Q remains constant
  • C. Q increases linearly
  • D. Q decreases linearly
Q. What happens to the current in a diode when the voltage is reversed beyond the breakdown voltage?
  • A. It increases exponentially
  • B. It decreases to zero
  • C. It remains constant
  • D. It becomes negative
Q. What happens to the current in an RC circuit as time approaches infinity after the switch is closed?
  • A. Current increases indefinitely
  • B. Current decreases to zero
  • C. Current remains constant
  • D. Current oscillates
Q. What happens to the electric potential energy when a positive charge moves away from another positive charge?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. What happens to the entropy of a system when heat is added at a constant temperature?
  • A. It decreases
  • B. It remains the same
  • C. It increases
  • D. It becomes zero
Q. What happens to the frequency of light when it passes from one medium to another?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. What happens to the gravitational force if one of the masses is tripled?
  • A. It triples
  • B. It remains the same
  • C. It doubles
  • D. It increases by a factor of nine
Q. What happens to the induced current if the magnetic field is removed?
  • A. It increases
  • B. It decreases
  • C. It reverses direction
  • D. It stops
Q. What happens to the photoelectric effect if the frequency of light is below the threshold frequency?
  • A. Electrons are emitted with high energy
  • B. No electrons are emitted
  • C. Electrons are emitted with low energy
  • D. Electrons are emitted but are not detected
Q. What happens to the resistance of a diode when it is forward-biased?
  • A. It increases significantly
  • B. It remains constant
  • C. It decreases significantly
  • D. It becomes infinite
Q. What happens to the speed of light when it passes from air into water?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. What happens to the total capacitance when capacitors are connected in series?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
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