Options:
- A. one second
- B. one day
- C. one minute
- D. one hour
View Answer
D. one hour
Physics
In double slit experiment we observe _____________________?
Options:
- A. interference fringes only
- B. diffraction fringes only
- C. both interference and diffraction fringes
- D. polirized frringes
View Answer
C. both interference and diffraction fringes
In the shadow of a ball the central portion appears bright that happens due to_________________?
Options:
- A. Interference
- B. Diffraction
- C. Polarization
- D. Refraction
View Answer
B. Diffraction
A thing that emits its own light is___________________?
Options:
- A. luminous
- B. non-luminous
- C. incandescent
- D. bright
View Answer
A. luminous
The co efficient of linear expansion is equal to__________?
Options:
- A. ?L = ?L?T
- B. ?L/L?T
- C. L?T/?L
- D. ?L?T-?L
View Answer
A. ?L = ?L?T
Taking off rocket can be explained by __________________?
Options:
- A. 1st law of motion
- B. 2nd law of motion
- C. Law of conservation of momentum
- D. law of conservation of energy
View Answer
C. Law of conservation of momentum
During long jump, athlete runs before taking the jump. By doing so he__________________?
Options:
- A. provide him a larger inertia
- B. decreases his inertia
- C. decreases his momentum
- D. increases his momentum
View Answer
D. increases his momentum
The velocity of sound is greatest in___________________?
Options:
- A. Water
- B. air
- C. copper
- D. ammonia
View Answer
C. copper
On loading the prong of a tuning form with wax its frequency____________________?
Options:
- A. increases
- B. decreases
- C. remains unchanged
- D. may increase or decrease
View Answer
B. decreases
Thermocouples convert___________________?
Options:
- A. heat energy into electrical energy
- B. heat energy into light energy
- C. heat energy into mechanical energy
- D. mechanical energy into heat energy
View Answer
A. heat energy into electrical energy