| 1 |
If the pressure of a gas is doubled, then speed of sound is. |
- A. Doubled
- B. Become half
- C. Not affected
- D. Increases by four times
|
| 2 |
A mass of 1 kg is freely falling. The force of gravity is. |
- A. 1 N
- B. 9.8 N
- C. 0.5 N
- D. Zero
|
| 3 |
Before the launch of a rocket the mass of fuel of the rocket is approximately consists of. |
- A. 60%
- B. 50%
- C. 80%
- D. 100%
|
| 4 |
S.I Unit of pressure of gas is. |
- A. Nm
- B. N.m
- C. N2/m
- D. N3m
|
| 5 |
If the radius of droplet becomes half, then its terminal velocity will become. |
- A. Double
- B. Half
- C. One fourth
- D. Remains same
|
| 6 |
The efficiency of diesel engine is about |
- A. 25 % to 30%
- B. 35% to 40%
- C. 40% to 50%
- D. 50% to 60%
|
| 7 |
If an object lies at focus point F in front of a converd lens, its image is formed at. |
- A. 2F
- B. F
- C. 3F
- D. Infinity
|
| 8 |
An oil film on water surface shows colour due to. |
- A. Diffraction
- B. Interference
- C. Polarization
- D. Dispersion
|
| 9 |
The phenomenon of polarization of light reveals that sun light is |
- A. Longitudinal waves
- B. Transverse wave
- C. Electromagnetic waves
- D. Monochromatic wave
|
| 10 |
When speed of a body is doubled then its |
- A. K.E. is doubled
- B. P.E. is doubled
- C. Acceleration of doubled
- D. Momentum is doubled
|