| 1 |
The principle underlying a microwave oven is
|
Heat generation by nuclear power <br>
Heat for the microwaves are the same <br>
Not Known, since cooking with mi8crowaves are discovered accidentally<br>
Microwaves vibrate the water molecules in food thereby generating heat<br>
|
| 2 |
A large ice berg melts at the base but not a t the top, because
|
The base of an iceberg remains in warmer surroundings<br>
Ice at the base contains impurities<br>
Due to high pressure, ice at the base lowers its melting point<br>
ice at he top may be of be a different kind<br>
|
| 3 |
Why is platinum wire used inside very narrow glass rods?
|
Platinum expands very little compared <br>
Platinum and glass have the same <br>
Glass is a bad conductor of heat <br>
Platinum does not melt at low temperature<br>
|
| 4 |
Grass looks green because:
|
It absorbs all the colours in the spectrum except green <br>
it absorbs only green form then spectrum <br>
The eye absorbs green form the grass <br>
it is good radiator<br>
|
| 5 |
Television signals cannot be received ordinary beyond a particular distance due to
|
Weakness of the signals of the <br>
Weak antenna <br>
Absorption of signal in the air curvature of Earth <br>
Curvature of Earth <br>
|
| 6 |
In old age, people generally have to wear spectacles for reading and writing because
|
Their eye illness start disintegrating<br>
They lose the power of accommodation <br>
The lenses lose their magnifying power <br>
the lenses lose their magnifying power <br>
|
| 7 |
When a person enters a dark room from bright light he cannot see anything clearly for some them, Slowly he starts seeing things. This is because
|
The iris contracts <br>
The iris expands <br>
The distance between the lens and retina increase <br>
The length of lens increase <br>
|
| 8 |
Why are we able to hear short wave broadcasts better than long wave broadcast:
|
Short wave broadcasts are made by nearby radio stations <br>
Short waves are unaffected by at disturbances<br>
Short waves are more energetic than long waves<br>
By convention, short waves are meant for long distances where as long waves are reserved for short distances <br>
|
| 9 |
A train goes past a railway station at a high speed. A young boy standing on the edge of the platform is likely to:
|
Remain unaffected <br>
Fall away form the train <br>
Fall towards the train<br>
Fall was away from or towards the train depending on its speed<br>
|
| 10 |
If an apple is released form an orbiting spaceship, it will
|
Fall toward the earth <br>
Move along with the spaceship at the same speed <br>
Move at a higher speed <br>
Move at a lower speed <br>
|
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