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Physics Questions Answers

  • 57. What is Hooke's Law ?

    1. Stress is inversely proportional to strain.
    2. Stress is directly proportional to strain.
    3. Stress and strain are dependent on each other.
    4. Stress and strain are independent of each other.
    Answer And Explanation

    Answer: Option B

  • 58. Lognitudinal waves and Transverse waves are types of ?

    1. Mechanical waves
    2. Non-Mechanical waves
    3. Both of above
    4. None of Above
    Answer And Explanation

    Answer: Option A

  • 59. Which of the following is an electromagnetic wave ?

    1. Cathode rays
    2. Sound wave
    3. Ultrasonic wave
    4. Infra red rays
    Answer And Explanation

    Answer: Option D

  • 60. What is the relation between wavelength, frequency and velocity ?

    1. velocity of wave = frequency * wavelength
    2. velocity of wave = frequency/wavelength
    3. velocity of wave = wavelength/frequency
    4. None of above
    Answer And Explanation

    Answer: Option A

  • 61. What are audible sound waves ?

    1. Having frequency less than 20 Hz
    2. Having frequency between 20 Hz to 20000 Hz
    3. Having frequency more than 20000 Hz
    4. None of above
    Answer And Explanation

    Answer: Option B

  • 62. What is the range of mercury thermometer ?

    1. 0 degree Celsius to 350 degree Celsius
    2. -10 degree Celsius to 350 degree Celsius
    3. -20 degree Celsius to 350 degree Celsius
    4. -30 degree Celsius to 350 degree Celsius
    Answer And Explanation

    Answer: Option D

  • 63. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings."

    1. Doppler's Effect
    2. Newton's law of cooling
    3. Kirchhoff's Law
    4. Stefan's Law
    Answer And Explanation

    Answer: Option B

    Explanation:

    Doppler's Effect - The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding.

    Kirchhoff's Law - Kirchhoff's Law signifies that good absorbers are good emitters.

    Stefan's Law - The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.