| 1 |
Which of the following is used in semi-conductors?
|
Aluminum <br>
Copper <br>
Silicon <br>
None of these <br>
|
| 2 |
Which of the following allotropes of carbon is used for cutting and drilling?
|
Diamond<br>
Graphite <br>
Activate carbon<br>
Carbon black <br>
|
| 3 |
Which one of the following is a vector?
|
Kinetic energy <br>
Pressure <br>
Rate of change of momentum <br>
Density <br>
|
| 4 |
X-rays comprise of:
|
Electrons only <br>
Protons only <br>
Neutrons only <br>
Electromagnetic radiations<br>
|
| 5 |
Diffusion of light in the atmosphere takes place due to
|
Carbon dioxide <br>
Dust particles <br>
Helium<br>
Water Vapours <br>
|
| 6 |
Transistors used in electronic equipments are mostly made of
|
Silver<br>
Copper <br>
Silicon<br>
Carbon<br>
|
| 7 |
The black hole theory was discovered by
|
S. Chandrashekhar<br>
C.V. Raman<br>
Har Gobind Khorana <br>
S. Ramanujan <br>
|
| 8 |
Which device mixes air and petrol (gas) for the internal combination engine?
|
Carburetor <br>
Choke <br>
Crankshaft <br>
Cylinder<br>
|
| 9 |
If the linear momentum of a particle is doubled, then its kinetic energy will be
|
Doubled<br>
Quadrupled<br>
Halved <br>
None of these<br>
|
| 10 |
The device used for converting A.C. form higher voltage to lower voltage or vice versa
|
Transmitter <br>
Commutator <br>
Transformer <br>
Generator<br>
|
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