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