Physics (School & Undergraduate)

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Q. What is the change in entropy when 1 kg of water at 100°C is converted to steam at 100°C?
  • A. 2260 J/K
  • B. 100 J/K
  • C. 540 J/K
  • D. 0 J/K
Q. What is the change in entropy when 1 mole of an ideal gas expands isothermally from 10 L to 20 L at 300 K?
  • A. 0.5 J/K
  • B. 1.0 J/K
  • C. 1.5 J/K
  • D. 2.0 J/K
Q. What is the charge stored in a capacitor of 5 µF at a voltage of 10 V?
  • A. 50 µC
  • B. 100 µC
  • C. 25 µC
  • D. 75 µC
Q. What is the charge stored in a capacitor of 5 µF when connected to a 10 V battery?
  • A. 0.05 mC
  • B. 0.1 mC
  • C. 0.2 mC
  • D. 0.5 mC
Q. What is the coefficient of linear expansion for a material that expands 0.01 m when heated from 20°C to 100°C over a length of 2 m?
  • A. 5 x 10^-5 /°C
  • B. 1 x 10^-4 /°C
  • C. 2 x 10^-4 /°C
  • D. 1 x 10^-5 /°C
Q. What is the coefficient of linear expansion for a material that expands by 0.01 m when heated from 20°C to 100°C over a length of 2 m?
  • A. 5 x 10^-5 /°C
  • B. 1 x 10^-4 /°C
  • C. 2 x 10^-4 /°C
  • D. 1.5 x 10^-4 /°C
Q. What is the concept of time dilation in special relativity?
  • A. Time moves faster for objects in motion.
  • B. Time moves slower for objects in motion.
  • C. Time is the same for all observers.
  • D. Time can be reversed.
Q. What is the concept of wave-particle duality?
  • A. Particles can exhibit both wave-like and particle-like properties.
  • B. Waves can only exist in one state at a time.
  • C. Particles cannot interfere with each other.
  • D. Light can only behave as a wave.
Q. What is the condition for a rolling object to be in pure rolling motion?
  • A. The object must not slide at all.
  • B. The object must have a constant velocity.
  • C. The object must have a constant acceleration.
  • D. The object must be on a flat surface.
Q. What is the condition for constructive interference in two coherent waves?
  • A. Path difference = (n + 0.5)λ
  • B. Path difference = nλ
  • C. Path difference = (n + 1)λ/2
  • D. Path difference = (n - 0.5)λ
Q. What is the condition for constructive interference of two waves?
  • A. Path difference is an odd multiple of half the wavelength
  • B. Path difference is an even multiple of the wavelength
  • C. Waves are out of phase
  • D. Waves are in phase
Q. What is the critical angle for total internal reflection from glass (n=1.5) to air (n=1)?
  • A. 41.8 degrees
  • B. 48.6 degrees
  • C. 60 degrees
  • D. 90 degrees
Q. What is the critical angle for total internal reflection?
  • A. sin(θc) = n2/n1
  • B. sin(θc) = n1/n2
  • C. θc = n1/n2
  • D. θc = n2/n1
Q. What is the current flowing through a 20 Ω resistor when a voltage of 100 V is applied?
  • A. 5 A
  • B. 10 A
  • C. 15 A
  • D. 20 A
Q. What is the current through a 10 Ω resistor if the voltage across it is 30 V?
  • A. 3 A
  • B. 1 A
  • C. 5 A
  • D. 2 A
Q. What is the current through a 12Ω resistor connected to a 36V source?
  • A. 2A
  • B. 3A
  • C. 4A
  • D. 5A
Q. What is the current through a 15 ohm resistor connected to a 45V source?
  • A. 3 A
  • B. 2 A
  • C. 1 A
  • D. 4 A
Q. What is the current through a 5 Ω resistor connected to a 15 V battery?
  • A. 3 A
  • B. 2 A
  • C. 1 A
  • D. 0.5 A
Q. What is the current through a 5Ω resistor if the voltage across it is 15V?
  • A. 3 A
  • B. 2 A
  • C. 1 A
  • D. 4 A
Q. What is the dielectric constant of a material if a capacitor with air as dielectric has a capacitance of 10 µF and the same capacitor with the material has a capacitance of 30 µF?
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Q. What is the effect of a prism on white light?
  • A. Reflection
  • B. Refraction
  • C. Dispersion
  • D. Absorption
Q. What is the effect of adding a dielectric to a capacitor?
  • A. Increases capacitance
  • B. Decreases capacitance
  • C. No effect on capacitance
  • D. Increases resistance
Q. What is the effect of connecting a capacitor in parallel with a resistor in a DC circuit?
  • A. Increases current
  • B. Decreases current
  • C. Stores energy
  • D. No effect
Q. What is the effect of friction on the motion of an object according to Newton's laws?
  • A. It increases acceleration
  • B. It decreases acceleration
  • C. It has no effect
  • D. It reverses direction
Q. What is the effect of increasing the area of a loop in a uniform magnetic field on the induced emf?
  • A. Induced emf increases
  • B. Induced emf decreases
  • C. Induced emf remains the same
  • D. Induced emf becomes zero
Q. What is the effect of increasing the capacitance in an RC circuit on the time constant?
  • A. Time constant decreases
  • B. Time constant increases
  • C. Time constant remains the same
  • D. Time constant becomes zero
Q. What is the effect of increasing the distance between the plates of a parallel plate capacitor?
  • A. Capacitance increases
  • B. Capacitance decreases
  • C. Capacitance remains the same
  • D. Capacitance becomes zero
Q. What is the effect of increasing the distance between the plates of a parallel plate capacitor on its capacitance?
  • A. Capacitance increases
  • B. Capacitance decreases
  • C. Capacitance remains the same
  • D. Capacitance becomes zero
Q. What is the effect of increasing the distance between two masses on the gravitational force?
  • A. The gravitational force increases.
  • B. The gravitational force decreases.
  • C. The gravitational force remains the same.
  • D. The gravitational force becomes zero.
Q. What is the effect of increasing the intensity of light on the photoelectric effect?
  • A. It increases the energy of emitted electrons
  • B. It increases the number of emitted electrons
  • C. It decreases the threshold frequency
  • D. It has no effect on the photoelectric effect
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