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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. 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.

2. Which unit we use to express Nuclear sizes ?

  • Tesla
  • Newton
  • Fermi
  • None of above

Answer: Option C

3. What are audible sound waves ?

  • Having frequency less than 20 Hz
  • Having frequency between 20 Hz to 20000 Hz
  • Having frequency more than 20000 Hz
  • None of above

Answer: Option B

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

  • True
  • False

Answer: Option A

5. What is Hooke's Law ?

  • Stress is inversely proportional to strain.
  • Stress is directly proportional to strain.
  • Stress and strain are dependent on each other.
  • Stress and strain are independent of each other.

Answer: Option B

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