| 1 |
The density of sea water increase as the:
|
Depth and salinity decrease <br>
Depth decrease and salinity increases <br>
Depth increase and salinity decrease <br>
Depth and salinity increase <br>
|
| 2 |
In cold countries alcohol is preferred to mercury as the thermometric liquid because?
|
Alcohol is a better conductor of heat<br>
Alcohol can be coloured and it level seen easily<br>
Alcohol has a very low freezing point<br>
Alcohol is cheaper than mercury<br>
|
| 3 |
Two steel pins, sticking to the end of the of a bar magnet do not hang vertically because.
|
Their head are not properly rounded <br>
Of the spherical shape of their heads<br>
Similar poles repel <br>
They are made of a magnetic substance<br>
|
| 4 |
Materials for rein rainproof and tents owe their waterproof properties to:
|
Surface tension<br>
viscosity<br>
Specific gravity <br>
Elasticity<br>
|
| 5 |
A man is hit harder when he falls on a concrete floor than when he falls on sand floor same height because
|
In latter case the feet of the man are brought to rest in a longer time than in former case<br>
In latte case friction is more than in former case <br>
In latter case send pores serve as cushions<br>
In latte case velocity is more than in former case<br>
|
| 6 |
Two shirts are warmer than one of the same material but of double thickness because:
|
Intervening air between two shirt prevents following of heat from body to outside<br>
Specific heat of single shirt is more than in former case<br>
Specific heart of two shirts is more tan that of one heat<br>
Air has large specific heat<br>
|
| 7 |
A am carrying a bucket full of water in of water in one hand stretches his other arm
|
To reduce consumption of energy <br>
To bring the combined center of gravity of his angular momentum <br>
To conserve his angular momentum <br>
To make his movements streamlined <br>
|
| 8 |
A fresh egg sinks in pure water but floats in a saline water because:
|
Saline water is denser than pure water <br>
Saline water is lighter than pure water<br>
Viscosity of saline water is higher than <br>
Surface tensiton of saline water is lower tan of pure water<br>
|
| 9 |
A shooting star is basically a:
|
Meteor <br>
Supernova <br>
Comet trail <br>
part of Sun <br>
|
| 10 |
Which is the brightest star?
|
Arcturus <br>
Sirius <br>
Canopus <br>
Antares <br>
|
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