| 1 |
Light travels slower in glass than in air because?
|
Refractive index of air is less than that of glass<br>
Refractive index of air is greater than that of glass<br>
Density of glass is less than that of air <br>
Density of glass of greater than that of air<br>
|
| 2 |
Which one among the following statements sis correct?
|
Concave mirror s are used as reflectors <br>
Convex mirrors are used by doctors to examine oral cavity <br>
Convex mirrors are used as reflectors<br>
Convex mirrors should be used as shaving<br>
|
| 3 |
Half portion of a rectangular piece of ice is warpped with a with piece of cloth while the other half with a black one, In this context, which one among the following statements is correct?
|
Ice melts more easily under black warp <br>
Ice melts more easily under white warp <br>
No ice melts at all under the black warp <br>
No ice melts at all under white warp <br>
|
| 4 |
What is a good coolant and is used to cool the engines of cars, buses , trucks, etc. Ii is because water has a?
|
High specific heat<br>
Low surface tension <br>
High boiling point <br>
Low expansively<br>
|
| 5 |
If a ship moves form freshwater into seawater,it will
|
Rise a little higher <br>
Sink completely<br>
Sink a little bit <br>
Remain unaffected <br>
|
| 6 |
The blackboard seems black because it?
|
Does not reflect any colour <br>
Reflects every colour <br>
Absorbs black colour <br>
Reflects black colour<br>
|
| 7 |
The minimum of a plane mirror to see the full image of a person of a is equal to-
|
The height of the person<br>
Half the height of person<br>
One-fourth the height of the person<br>
Double the height of the person<br>
|
| 8 |
When a ball drops on the the floor it bounces why does it bounce?
|
The floor heats up on impact <br>
Newton's third law implies that for every<br>
File floor exerts a force on the ball during the impact <br>
The floor is perfectly rigid <br>
|
| 9 |
Cream gets separated form milk when it is churned because of:
|
Gravitational force <br>
Centrifugal force <br>
Frictional force <br>
Cohesive force<br>
|
| 10 |
Ina refrigerator, cooling is produced by?
|
The evaporation of a volatile liquid<br>
The sudden expansion of a compressed gas <br>
The ice which deposits on the freezer <br>
None of the above<br>
|
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