| 1 |
The shape of a spot of light produced when bright sunshine passes perpendicular through a hole of very small size is
|
Square, because the hole is a square <br>
Round, because it is an image of the sun<br>
Round with a small penumbra around it <br>
Square with a small penumbra <br>
|
| 2 |
Which gas is commonly used in balloon s and airships?
|
Nitrogen<br>
Helium <br>
Carbon <br>
Hydrogen<br>
|
| 3 |
Which of the following is a physical change
|
Boiling of water <br>
Rusting of iron <br>
Boiling of an Egg<br>
Burning of cundia <br>
|
| 4 |
Superconductors are those materials
|
Which become non-conductors at transition point <br>
Which looses all electrical resistance <br>
In which resistance rises to infinity below certain temperature <br>
Which conducts electricity in extra width <br>
|
| 5 |
Which one of the following is not a radioactive element
|
Uranium <br>
Radium <br>
Thorium <br>
Cadmium <br>
|
| 6 |
A falling drop of rain water ecquir3es the spherical shape due to
|
Surface Tension <br>
Gravitational force <br>
Atmospheric pressure <br>
Viscosity <br>
|
| 7 |
A persicope works by the principle of
|
Refraction <br>
Total internal reflection<br>
Diffraction<br>
Reflection and refraction<br>
|
| 8 |
Which of the following light waves is out side the visible spectrum?
|
Violet <br>
Blue <br>
Yellow <br>
Ultraviolet <br>
|
| 9 |
Estimated time period of a pendulum of length 0.2 is closer to is
|
5 sec<br>
1 sec<br>
2 sec<br>
None of these <br>
|
| 10 |
What is the value of knee voltage of silicon diode?
|
0.3 V<br>
0.33 V<br>
0.7 V<br>
1.1 V<br>
|
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