Question Detail

What is unit of Work and Energy ?

Joule
kilogram
amphere
meter

Answer: Option A

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

Ammeter
Galvanometer
Voltmeter
None of above

Answer: Option C

2. Which law is also called law of inertia ?

Newton first law
Newton second law
Newton third law
All of above

Answer: Option A

3. 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.

4. Thomas Alva Edison invented

Cinema
Cine Camera
Computer
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.

5. Which instrument is used to measure pressure of gases ?

Manometer
Machmeter
Magnetometer
Micrometer

Answer: Option A

Explanation:

Machmeter - is used to determine the speed of an aircraft in terms of speed of sound,

Magnetometer - is used to compare magnetic movements and fields,

Micrometer - is used to convert sound waves into electrical vibrations.