Question Detail
Which unit we use to express Nuclear sizes ?
- Tesla
- Newton
- Fermi
- None of above
Answer: Option C
1. Which instrument is used in submarine to see the objects above sea level ?
- Pykometer
- Polygraph
- Photometer
- Periscope
Answer: Option D
Explanation:
Pykometer - used to determine the density and coefficient of expansion of liquids,
Polygraph - used to record changes in heartbeat, blood-pressure and respiration,
Photometer - used to compare luminous intensity of the source of light.
2. Which instrument is used to measure changes in volume of substances ?
- Dyanamo
- Dilatometer
- Cyclotron
- Electroscope
Answer: Option B
Explanation:
Dyanamo - is used to convert mechanical energy into electrical energy,
Cyclotron - is a charged particle accelerator which can accelerate charged particles to high energies,
Electroscope - is used to detect the presence of an electric charge.
3. Which instrument is used to measure heat radiation ?
- Radar
- Salinometer
- Refractometer
- Radio micrometer
Answer: Option D
Explanation:
Radar - is used to detect the direction and speed of an object by means of radiowaves,
Salinometer - is used to determine salinity of solutions,
Refractometer - is used to measure refractive indices.
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. What is escape velocity ?
- Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
- Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
- Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.
- Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.
Answer: Option C