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Which instrument is used to measure sound under water ?

  • Hygrometer
  • Hygroscope
  • Hypsometer
  • Hydrophone

Answer: Option D

Explanation:

Hygrometer - is used to measure level of humidity,

Hygroscope - shows the changes in atmospheric humidity,

Hypsometer - is used to determine the boiling points of liquids.

Similar Questions :

1. Orbital speed of a satellite is dependent of its mass.

  • True
  • False

Answer: Option B

Explanation:

Orbital speed of a satellite is independent of its mass.

2. K. Macmillan invented

  • Bicycle
  • Barometer
  • Calculating Machine
  • 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.

3. Atom is the smallest part of matter which takes part in chemical reactions.

  • True
  • False

Answer: Option A

4. What is displacement ?

  • Longest distance covered by a body in a random direction.
  • Shortest distance covered by a body in a random direction.
  • Shortest distance covered by a body in a definite direction.
  • Longest distance covered by a body in a definite direction.

Answer: Option C

5. Which of following in not a property of cathode ray.

  • Cathode rays are invisible and travel in a straight line.
  • These rays can ionise gases.
  • These rays can penetrate through thin metal foils.
  • These rays make materials cool on which they fall.

Answer: Option D

Explanation:

These rays heat the materials on which they fall.

Read more from - Physics Questions Answers
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