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For the following questions answer them individually
Sound is heard over longer distances on rainy days because
sound travels slowly in moist air
sound travels faster in moist air
moist air does not absorb sound
moist air absorbs sound
What kind of rays are X-rays?Â
positively charged particles
negatively charged particles
neutral particles
None of these
What is the example of vestigial organ ?
Eye-brow
Collar-bone
Wisdom-teeth
Nails
Railway tracks are banked on curves so that :
the train may not fall down inwards.
the weight of the train may be reduced.
necessary centripetal force may be obtained from the horizontal component ofthe normal reaction due to track.
no frictional force may be produced between the wheels and the track.
After ‘PROM’ is programmed, we can only _ the information.
read
write
read and write
remove
We feel cool when we sit near the fan, this is because
fan gives cool air.
fan cools surrounding air.
air evaporates the sweat on our body.
we feel cool when air touches the body.
Water flows off the wings of birds and insects due- to the presence of
Waxes
Sugars
Proteins
Minerals
Which chemical is associated with muscle fatigue?
Uric acid
Acetic acid
Pyruvic acid
Lactic acid
Which one of the following does not contain silver ?
Horn silver
Ruby silver
German silver
Lunar caustic
The average kinetic energy of the molecules of an ideal gas is directly proportional to
Velocity of Molecules
Mass of Molecules
Absolute temperature of the gas,
Temperature of environment
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