Q.61)-Soldering of two metals is possible due to the property of
- Diffraction
- Viscosity
- Surface tension
- Cohesion
Q.62)-In extreme cold conditions in cold countries, water pipes get busted
- Because on freezing water expands
- Due to the contraction of water pipes
- Due to high atmospheric pressure
- All of these
Q.63)-Pressure cooker cooks faster because
- Boiling point increases with increase in pressure
- It cooks the food at low pressure
- Higher temperature is attained for cooking
- The material of the cooker is a good conductor
Q.64)-Water is not vaporized if
- Temperature is 00C
- Humidity is 0%
- Humidity is 100%
- Temperature is 1000C
Q.65)-When heated from 00C to 1000C volume of a given mass of water will
- Increase gradually
- Decrease gradually
- Increase and then will decrease
- Decrease and then will increase
Q.66)-Vegetables are cooked in lesser time by adding a pinch of salt while cooking because
- Boiling point of water increases
- Latent heat of vaporization of water decreases
- Latent heat of vaporization of water increases
- Boiling point of water decreases
Q.67)-The boiling point of liquid vary as
- Pressure varies
- Temperature varies
- Volume varies
- Density varies
Q.68)-When water freezes its density
- Decreases
- Becomes zero
- Remains constant
- Increases
Q.69)-Super cooling stands for cooling of a liquid
- At freezing point
- At melting point
- Below freezing point
- Above melting point
Q.70)-Refrigerator protects the food from contamination because
- At its low temperature bacteria and fungus become non-reactive
- Germs get died at this temperature
- Germs get freeze at this temperature
- It makes food free from germs