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David Hughes invented

  • Machine Gun
  • Microphone
  • Microscope
  • 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.

Similar Questions :

1. Device used to measure potential difference between two points in a circuit is ?

  • Ammeter
  • Galvanometer
  • Voltmeter
  • None of above

Answer: Option C

2. 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.

3. 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.

4. Scalar Quantities are

  • physical quantities which have magnitude only and no direction
  • physical quantities which have no magnitude only and only direction
  • physical quantities which have magnitude only and direction
  • physical quantities which have no magnitude and no direction

Answer: Option A

5. The absorption of ink by blotting paper involves

  • capillary action phenomenon
  • viscosity of ink
  • siphon action
  • diffusion of ink through the blotting

Answer: Option A

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