World GK Questions and answers pdf - 1
Question: 1
What is freezing mixture?
A mixture of compound that produces a low temperature is called freezing mixture.
The freezing mixture of salt and ice is in the ratio 1:3.
Question: 2
Define vapourisation and condensation?
Vapourisation : The process in which a liquid changes into vapour on heating is called vapourisation (e.g) water changes into water vapour or steam.
Condensation : When vapour condenses to form a liquid, the change of state is called condensation (e.g) steam changes to water.
Question: 3
Define specific heat capacity?
The specific heat capacity of a substance is the amount of heat required to raise the temperature of 1 Kg of a substance by 1°C. The unit of specific heat capacity is joule per kilogram per Kelvin or J/kg/K.
Question: 4
Define joule?
The amount of heat energy required to raise the temperature of 1 gram of water through 1°C is called 1 calorie. The amount of heat energy required to raise the temperature of 1 kg of water through 1&Deg;C is called 1 kilocalorie.
1 calorie ⇒ 4.2 joules
1 kilo calorie ⇒ 4.2 x 1000 = 4200 joule.
Question: 5
What is called fuel?
Materials which produce heat when burnt are called fuels. Coal, petrol, cooking gas etc are fuels.
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