Physics Questions Answers

• 8. K. Macmillan invented

  1. Bicycle
  2. Barometer
  3. Calculating Machine
  4. Centigrade Scale

  Answer :

  Option A

  Explanation:

  K. Macmillan of Scotland invented Bicycle in 1839.
  
  Barometer was invented by E. Torricelli of Italy in 1644.
  
  Calculating Machine was invented by Pascal of France in 1642.
  
  Centigrade Scale was invented by A. Celsius of France in 1742.

• 9. Solar cell converts

  1. Sound energy into electrical energy
  2. Electrical energy into mechanical energy
  3. Solar energy into electrical energy
  4. Electrical energy into light energy

  Answer :

  Option C

• 10. Force of attraction between the molecules of different substances is called

  1. Surface tension
  2. Cohensive force
  3. Adhesive force
  4. None of above

  Answer :

  Option C

  Explanation:

  Cohensive force - Force of attraction between the molecules of same substance is called Cohensive force.
  

• 11. David Hughes invented

  1. Machine Gun
  2. Microphone
  3. Microscope
  4. Motorcycle

  Answer :

  Option B

  Explanation:

  David Hughes of USA invented Microphone in 1878,
  
  Machine Gun was invented by Richard Gatling of USA in 1861,
  
  Microscope was invented by Z. Jansen of Netherlands in 1590,
  
  Motorcycle was invented by Edward Butler of England in 1884.

• 12. Which instrument is used in submarine to see the objects above sea level ?

  1. Pykometer
  2. Polygraph
  3. Photometer
  4. Periscope

  Answer :

  Option D

  Explanation:

  Pykometer - used to determine the density and coefficient of expansion of liquids,
  
  Polygraph - used to record changes in heartbeat, blood-pressure and respiration,
  
  Photometer - used to compare luminous intensity of the source of light.

• 13. Orbital speed of a satellite is dependent of its mass.

  1. True
  2. False

  Answer :

  Option B

  Explanation:

  Orbital speed of a satellite is independent of its mass.

• 14. Thomas Alva Edison invented

  1. Cinema
  2. Cine Camera
  3. Computer
  4. Cinematograph

  Answer :

  Option D

  Explanation:

  Thomas Alva Edison of USA invented Cinematograph in 1891,
  
  Cinema was invented by A.L. and J.L. Lumiere of France in 1895,
  
  Cine Camera was invented by Friese-Greene of Britain in 1889,
  
  Computer was invented by Charles Babbage of Britain in 1834, he is also known as Father of Computer.