21) Steam at 100 degree Celsius causes more severe burns than water at 100-degree celsius because?
Ans) Steam has more latent heat than water
22) Which combination of color is the most convenient during day and night time?
Ans) Red and Green
23) Which part of the sunlight makes the solar cooker hot?
Ans) Infrared
24) Due to which clean nights are colder than cloudy nights?
Ans) Radiation
25) A gas thermometer is more sensitive than a liquid thermometer because of gas? Ans) Expands more than a liquid
26) Ventilators are provided near the ceiling of the room because?
Ans) Warmer air rise up and goes out
27) Which principle is used to produce low temperatures?
Ans) A diabatic demagnetization
28) When hot liquid is poured into a thick glass tumbler it cracks because of glass?
Ans) Is a bad conductor of heat so only inner surface expands
29) On mixing impurity the boiling point of the liquid?
Ans) Increase
30) Celsius was initially known as?
Ans) Centigrade
31) The good absorber is good emitter is the statement of?
Ans) Kirchhoff
32) The amount of heat required the change the state of a unit mass of substance at constant temperature is called?
Ans) Latent heat
33) The density of water is maximum at?
Ans) 4 degree C
34) Sublimation takes place when the boiling point is less than?
Ans) Melting point
35) Lambert’s law is related to?
Ans) Illumination
36) Spectacles used to measure 3D films have?
Ans) Bifocal lens
37) Night photography is possible using infrared radiation. What are the primary colors in the photograph
Ans) Red, Blue, and Yellow
38) What is the sharpness of a television image is called?
Ans) Resolution
39) A mirage occurs because of?
Ans) Total internal reflection by layers of air
40) The final image in the simple microscope is?
Ans Virtual, magnified and erect
