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Physics

Physics
What is the minimum distance (in metres) required to hear an echo?

21
17
10
13

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Physics
Water is not suitable as a calorimetric substance because it :

Has high boiling point
Low latent heat of vapourization
Is a good conductor
Has high specific heat

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Physics
Vegetables are cooked in lesser time by adding a pinch of salt while cooking because

Latent heat of vaporization of water increases
Boiling point of water increases
Latent heat of vaporization of water decreases
Boiling point of water decreases

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Physics
Which one of the following animals can hear ultrasonic sound ?

Rat
Bat
Cat
Squirrel

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Physics
Which of the following liquids is most viscous?

Water
Petrol
Milk
Oil

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Physics
The snow on the mountains does not melt all at once when it is heated by the sun because:

It has a high latent heat of fusion
It reflects most of the heat from the sun
It becomes very hard
It has a low specific heat capacity

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