Question Detail
The angle of reflection is equal to the angle of incidence.
- True
- False
Answer: Option A
1. Force of attraction between the molecules of different substances is called
- Surface tension
- Cohensive force
- Adhesive force
- None of above
Answer: Option C
Explanation:
Cohensive force - Force of attraction between the molecules of same substance is called Cohensive force.
2. Which instrument is used to measure altitudes in aircraft's ?
- Audiometer
- Ammeter
- Altimeter
- Anemometer
Answer: Option C
Explanation:
Ammeter - Measures strength of electric current.
Audiometer - Measures intensity of sound.
Anemometer - Measures force and velocity of wind and directions.
3. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings."
- Doppler's Effect
- Newton's law of cooling
- Kirchhoff's Law
- Stefan's Law
Answer: Option B
Explanation:
Doppler's Effect - The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding.
Kirchhoff's Law - Kirchhoff's Law signifies that good absorbers are good emitters.
Stefan's Law - The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
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. Orbital speed of a satellite is dependent of its mass.
- True
- False
Answer: Option B
Explanation:
Orbital speed of a satellite is independent of its mass.