Physics MCQs with Answers

This is Physics MCQs section with detailed explanations for preparation of screening tests, interviews for government jobs. In this section candidate will learn MCQs on variety of topics from the subject.

1. 81 Sound waves do not travel in vacuum because ___________________
   

   1. they are transverse waves

   2. they are stationary waves

   3. they require material medium for propagation

   4. they do not have enough energy

   See Answer

   Added By: Ak Aamir

   Answer

   : they require material medium for propagation

   Explanation

   :
   N/A

2. 82 Increase in velocity of sound in the air for 1C rise in temperature is_________________
   

   1. 1.61 ms-1

   2. 61.0 ms-1

   3. 0.61 ms-1

   4. 2.00 ms-1

   See Answer

   Added By: Ak Aamir

   Answer

   : 0.61 ms-1

   Explanation

   :
   N/A

3. 83 On loading the prong of a tuning form with wax its frequency____________________
   

   1. increases

   2. decreases

   3. remains unchanged

   4. may increase or decrease

   See Answer

   Added By: Ak Aamir

   Answer

   : decreases

   Explanation

   :
   N/A

4. 84 The normal ear is the most sensitive in the frequency range___________________
   

   1. 20000 to 30000 hertz

   2. 10 to 20 hertz

   3. 2000 to 4000 hertz

   4. 6000 to 8000 hertz

   See Answer

   Added By: Ak Aamir

   Answer

   : 2000 to 4000 hertz

   Explanation

   :
   N/A

5. 85 The velocity of sound in air would become double than its velocity at 0C at temperature________________
   

   1. 313C

   2. 586C

   3. 819C

   4. 1172C

   See Answer

   Added By: Ak Aamir

   Answer

   : 819C

   Explanation

   :
   N/A

6. 86 The periodic alternation of sound between maximum and minimum loudness are called___________________
   

   1. silence zone

   2. interference

   3. beats

   4. resonance

   See Answer

   Added By: Ak Aamir

   Answer

   : beats

   Explanation

   :
   N/A

7. 87 Beats are the results of____________________
   

   1. diffraction of sound waves

   2. constructive and destructive interference

   3. polarization

   4. destructive interference

   See Answer

   Added By: Ak Aamir

   Answer

   : constructive and destructive interference

   Explanation

   :
   N/A

8. 88 Doppler effect applies to____________________
   

   1. sound wave only

   2. light wave only

   3. both sound and light waves

   4. neither sound nor light wave

   See Answer

   Added By: Ak Aamir

   Answer

   : both sound and light waves

   Explanation

   :
   N/A

9. 89 A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency
   

   1. 1/4f

   2. 1/2f

   3. frequency lower than 20 Hz

   4. 2f

   See Answer

   Added By: Ak Aamir

   Answer

   : frequency lower than 20 Hz

   Explanation

   :
   N/A

10. 90 In open organ pipe___________________
    

    1. only even harmonics are present

    2. only odd harmonics are present

    3. both even and odd harmonics are present

    4. selected harmonics are present

    See Answer

    Added By: Ak Aamir

    Answer

    : both even and odd harmonics are present

    Explanation

    :
    N/A