Heat
- Air is filled in vehicle tyres because
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Air is filled in vehicle tyres because it is highly compressible
Correct Option: D
Air is filled in vehicle tyres because it is highly compressible.
- Which one of the following liquids is very good conductor of heat ?
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Mercury is very good conductor of heat . Hence mercury is used in thermometer.
Correct Option: A
Mercury is very good conductor of heat . Hence mercury is used in thermometer.
- When ice melts, then the
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When ice melts, density increases so volume decreases.
Correct Option: B
When ice melts, density increases so volume decreases.
- Refrigeration helps in food preservation by
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Refrigeration lowers the temperature which helps in food preservation by reducing the rate of bio-chemical reactions.
Correct Option: B
Refrigeration lowers the temperature which helps in food preservation by reducing the rate of bio-chemical reactions.
- At which temperature the Centigrade and Fahrenheit scales are equal ?
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As C/5 = F - 32/9
if C = F = X° then X°/5 = X° - 32/9
⇒ 9X° = 5X° - 32 x 5
⇒ 4X° = - 32 x 5
⇒ X° = - 32 x 5/4 = - 40°Correct Option: B
As C/5 = F - 32/9
if C = F = X° then X°/5 = X° - 32/9
⇒ 9X° = 5X° - 32 x 5
⇒ 4X° = - 32 x 5
⇒ X° = - 32 x 5/4 = - 40°
