Q. Which of the following has the highest penetrating power?

  • (A) Alpha rays
  • (B) Beta rays
  • (C) Gamma rays
  • (D) X-rays
๐Ÿ“ Notes
โœ… Correct Answer: (C) Gamma rays
Explanation: Gamma rays have the highest penetrating power among radioactive emissions.

Q. The escape velocity from a planet depends on:

  • (A) Mass of the object
  • (B) Radius and mass of the planet
  • (C) Density of air
  • (D) Temperature of the planet
๐Ÿ“ Notes
โœ… Correct Answer: (B) Radius and mass of the planet
Explanation: Escape velocity v = √(2GM/R), so it depends on the planet's mass and radius.

Q. The SI unit of capacitance is:

  • (A) Henry
  • (B) Farad
  • (C) Weber
  • (D) Tesla
๐Ÿ“ Notes
โœ… Correct Answer: (B) Farad
Explanation: Capacitance is measured in Farad (F).

Q. In simple harmonic motion, acceleration is:

  • (A) Constant
  • (B) Directly proportional to displacement
  • (C) Inversely proportional to displacement
  • (D) Proportional to the square of displacement
๐Ÿ“ Notes
โœ… Correct Answer: (B) Directly proportional to displacement
Explanation: In SHM, acceleration a = -ω²x, i.e., it is directly proportional to displacement and opposite in direction.

Q. Which law gives the relation between pressure and temperature of a gas at constant volume?

  • (A) Boyle's law
  • (B) Charles's law
  • (C) Gay-Lussac's law
  • (D) Avogadro's law
๐Ÿ“ Notes
โœ… Correct Answer: (C) Gay-Lussac's law
Explanation: Gay-Lussac's law states that pressure is directly proportional to absolute temperature when volume remains constant.

Q. The SI unit of inductance is:

  • (A) Tesla
  • (B) Henry
  • (C) Weber
  • (D) Farad
๐Ÿ“ Notes
โœ… Correct Answer: (B) Henry
Explanation: The SI unit of inductance is Henry (H), named after Joseph Henry.

Q. A car moves with a speed of 20 m/s and comes to rest in 5 s. The retardation is:

  • (A) 2 m/s²
  • (B) 4 m/s²
  • (C) 5 m/s²
  • (D) 10 m/s²
๐Ÿ“ Notes
โœ… Correct Answer: (B) 4 m/s²
Explanation: Acceleration a = (v - u)/t = (0 - 20)/5 = -4 m/s². Retardation is 4 m/s².

Q. The dimension of energy is:

  • (A) [MLTโป²]
  • (B) [ML²Tโป²]
  • (C) [ML²Tโป¹]
  • (D) [MโฐLTโป²]
๐Ÿ“ Notes
โœ… Correct Answer: (B) [ML²Tโป²]
Explanation: Energy has the same dimensions as work, i.e., Force × Distance = [ML²Tโป²].

Q. Which of the following is a non-conservative force?

  • (A) Gravitational force
  • (B) Electrostatic force
  • (C) Frictional force
  • (D) Spring force
๐Ÿ“ Notes
โœ… Correct Answer: (C) Frictional force
Explanation: Frictional force depends on the path taken and dissipates energy, hence it is non-conservative.

Q. The orbital speed of a satellite near Earth's surface is approximately:

  • (A) 3.2 km/s
  • (B) 7.9 km/s
  • (C) 11.2 km/s
  • (D) 15 km/s
๐Ÿ“ Notes
โœ… Correct Answer: (B) 7.9 km/s
Explanation: The first cosmic velocity or orbital velocity near Earth is about 7.9 km/s.

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