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Which of the following is an electromagnetic wave ?

  • Cathode rays
  • Sound wave
  • Ultrasonic wave
  • Infra red rays

Answer: Option D

Similar Questions :

1. Light year is a unit of

  • Time
  • Light
  • Distance
  • Intensity of light

Answer: Option C

2. radian per second is unit of

  • Momentum
  • Moment of Inertia
  • Frequency
  • Angle Velocity

Answer: Option D

Explanation:

unit of Momentum is kilogram meter per second,

unit of Moment of Inertia is kilogram square meter,

unit of frequency is Hertz.

3. When a body is immersed partly or wholly in a liquid, there is an apparent loss in weight of the body which is equal to the weight of liquid displaced by the body.

  • True
  • False

Answer: Option A

Explanation:

TRUE, it is Archimedes Principle.

4. Alfred Nobel invented

  • X ray
  • Diesel Engine
  • Dynamite
  • Dynamo

Answer: Option C

Explanation:

Alfred Nobel if Sweden invented Dynamite in 1867,

X ray was invented by Wilhelm Roentgen of Germany in 1895,

Diesel Engine was invented by Rudolf Diesel of Germany 1892,

Dynamo was invented by Michael Faraday of England in 1831.

5. What is unit of Astronomical distance ?

  • light year
  • angstrom
  • weber
  • lux

Answer: Option A

Explanation:

angstrom is used to measure wave length,

weber is used to measure Magnetic flux,

lux is used to measure Intensity of illumination.

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