Physics MCQs – Set 8: High-Level Questions for UPSC/PCS Exam Prep

  1. The SI unit of surface tension is –
    (A) N/m
    (B) N/m²
    (C) J/m
    (D) Nm²
    Answer: (A)
  2. A moving coil galvanometer measures –
    (A) Current
    (B) Voltage
    (C) Magnetic field
    (D) Capacitance
    Answer: (A)
  3. Waves on a string are –
    (A) Longitudinal
    (B) Transverse
    (C) Electromagnetic
    (D) Complex
    Answer: (B)
  4. A geyser works on –
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) Reflection
    Answer: (B)
  5. Power is defined as –
    (A) Energy consumed
    (B) Work done per unit time
    (C) Heat per mass
    (D) Force per time
    Answer: (B)
  6. The radius of curvature of a plane mirror is –
    (A) Zero
    (B) One
    (C) Infinite
    (D) Undefined
    Answer: (C)
  7. Tesla is the unit of –
    (A) Magnetic field
    (B) Electric field
    (C) Capacitance
    (D) Resistance
    Answer: (A)
  8. Heat transfer in a vacuum takes place by –
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) Evaporation
    Answer: (C)
  9. The angle between incident ray and reflected ray is –
    (A) 0°
    (B) 90°
    (C) Equal to twice the angle of incidence
    (D) Always 180°
    Answer: (C)
  10. A convex lens forms a real and inverted image when the object is –
    (A) At infinity
    (B) At the focus
    (C) Between focus and optical center
    (D) Between focus and 2F
    Answer: (D)
  11. The minimum distance required for an echo to be heard is approx –
    (A) 5 m
    (B) 10 m
    (C) 17 m
    (D) 25 m
    Answer: (C)
  12. The wavelength of red light is –
    (A) 400 nm
    (B) 550 nm
    (C) 700 nm
    (D) 800 nm
    Answer: (C)
  13. The function of a capacitor is to –
    (A) Convert AC to DC
    (B) Store electrical energy
    (C) Amplify signals
    (D) Measure resistance
    Answer: (B)
  14. Bernoulli’s principle explains –
    (A) Lift in airplanes
    (B) Working of brakes
    (C) Refraction of light
    (D) Echo
    Answer: (A)
  15. The hearing range of human ear is –
    (A) 20–200 Hz
    (B) 20–2000 Hz
    (C) 20–20,000 Hz
    (D) 2–20,000 Hz
    Answer: (C)
  16. The image in a concave mirror is virtual when the object is placed –
    (A) Beyond the center
    (B) At the focus
    (C) Between focus and mirror
    (D) At infinity
    Answer: (C)
  17. A fuse wire should have –
    (A) High resistance, high melting point
    (B) Low resistance, low melting point
    (C) High resistance, low melting point
    (D) Low resistance, high melting point
    Answer: (C)
  18. Joule’s Law relates heat and –
    (A) Mass
    (B) Charge
    (C) Resistance
    (D) Electric current
    Answer: (D)
  19. Pascal’s Law is applicable to –
    (A) Gases
    (B) Fluids
    (C) Solids
    (D) Plasma
    Answer: (B)
  20. One light year is approximately –
    (A) 9.46 million km
    (B) 9.46 billion km
    (C) 9.46 trillion km
    (D) 9.46 quadrillion km
    Answer: (C)
  21. The force of gravity acts on –
    (A) Only solid bodies
    (B) All bodies with mass
    (C) Only liquid bodies
    (D) Only celestial objects
    Answer: (B)
  22. Conductivity increases in metals with –
    (A) Temperature rise
    (B) Temperature fall
    (C) Current flow
    (D) Resistance increase
    Answer: (B)
  23. High frequency sound is called –
    (A) Sonic
    (B) Subsonic
    (C) Supersonic
    (D) Ultrasonic
    Answer: (D)
  24. A nuclear reactor uses –
    (A) Controlled fusion
    (B) Controlled fission
    (C) Spontaneous fusion
    (D) Thermionic emission
    Answer: (B)
  25. A rainbow is an example of –
    (A) Refraction only
    (B) Reflection only
    (C) Dispersion and total internal reflection
    (D) Polarization
    Answer: (C)
  26. Electric field is strongest where field lines are –
    (A) Close together
    (B) Far apart
    (C) Curved
    (D) Circular
    Answer: (A)
  27. The rate of flow of charge is called –
    (A) Potential
    (B) Resistance
    (C) Electric current
    (D) Power
    Answer: (C)
  28. Hooke’s Law is valid up to –
    (A) Elastic limit
    (B) Proportional limit
    (C) Yield point
    (D) Fracture point
    Answer: (A)
  29. Boiling is a process that occurs –
    (A) Only at surface
    (B) Throughout the liquid
    (C) At room temp
    (D) Without heating
    Answer: (B)
  30. Superconductors exhibit –
    (A) Zero resistance
    (B) Infinite voltage
    (C) High temperature
    (D) High capacitance
    Answer: (A)
  31. A sonometer is used to study –
    (A) Sound speed
    (B) Surface tension
    (C) Frequency of vibration
    (D) Electric fields
    Answer: (C)
  32. The photoelectric current increases with –
    (A) Frequency
    (B) Intensity of light
    (C) Wavelength
    (D) Angle of incidence
    Answer: (B)
  33. The charge of alpha particle is –
    (A) +1e
    (B) –1e
    (C) +2e
    (D) 0
    Answer: (C)
  34. The slope of a velocity–time graph gives –
    (A) Speed
    (B) Acceleration
    (C) Displacement
    (D) Work
    Answer: (B)
  35. A liquid rises in a capillary tube due to –
    (A) Adhesion
    (B) Surface tension
    (C) Both A and B
    (D) Cohesion only
    Answer: (C)
  36. A pressure cooker cooks food faster by –
    (A) Lowering boiling point
    (B) Raising pressure and boiling point
    (C) Reducing water usage
    (D) Decreasing steam
    Answer: (B)
  37. Polarization of light proves its –
    (A) Wave nature
    (B) Particle nature
    (C) Dual nature
    (D) Thermal nature
    Answer: (A)
  38. Escape velocity from Earth does not depend on –
    (A) Radius of Earth
    (B) Mass of Earth
    (C) Mass of object
    (D) Gravitational constant
    Answer: (C)
  39. 1 Calorie equals –
    (A) 4.2 J
    (B) 420 J
    (C) 4.2 kJ
    (D) 4200 J
    Answer: (A)
  40. Optical fiber communication is based on –
    (A) Interference
    (B) Total internal reflection
    (C) Diffraction
    (D) Refraction
    Answer: (B)
  41. Loudness of sound is measured in –
    (A) Hz
    (B) Decibels
    (C) Joules
    (D) Watts
    Answer: (B)
  42. The resistivity of a conductor depends on –
    (A) Length
    (B) Area
    (C) Material
    (D) Shape
    Answer: (C)
  43. A parabolic reflector is used in –
    (A) Car headlights
    (B) TV remotes
    (C) Binoculars
    (D) Lasers
    Answer: (A)
  44. A cathode ray tube uses –
    (A) Protons
    (B) Alpha particles
    (C) Electrons
    (D) Neutrons
    Answer: (C)
  45. SI unit of inductance is –
    (A) Henry
    (B) Weber
    (C) Tesla
    (D) Farad
    Answer: (A)
  46. 1 electron volt (eV) equals –
    (A) 1.6 × 10⁻¹⁹ J
    (B) 3 × 10⁸ J
    (C) 1.6 J
    (D) 9.8 × 10⁻¹⁹ J
    Answer: (A)
  47. The velocity of electromagnetic waves in vacuum is –
    (A) 3 × 10⁸ m/s
    (B) 1.6 × 10⁻¹⁹ m/s
    (C) 3 × 10⁶ m/s
    (D) 3 × 10⁵ km/h
    Answer: (A)
  48. Electric motor converts –
    (A) Mechanical to electrical
    (B) Electrical to mechanical
    (C) Electrical to heat
    (D) Mechanical to thermal
    Answer: (B)
  49. Inertia is directly proportional to –
    (A) Velocity
    (B) Mass
    (C) Acceleration
    (D) Power
    Answer: (B)
  50. A lens with focal length 20 cm has power –
    (A) +0.2 D
    (B) +2 D
    (C) +5 D
    (D) +20 D
    Answer: (C)
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