EASY
Earn 100

Choose the correct word from the following options:

Land and sea breezes are caused due to:-

50% studentsanswered this correctly

Important Questions on Transformation

MEDIUM
Physics>Change>Transformation>Thermal Energy and Heat Transfer
The power radiated by a black body is P and it radiates maximum energy at wavelength, λ0. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 34λ0, the power radiated by it becomes nP. The value of n is
MEDIUM
Physics>Change>Transformation>Thermal Energy and Heat Transfer
Name the physical quantity which is measured in calories. How is calorie related to the SI unit of that quantity?
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
A black body has maximum wavelength λm at temperature 2200 K. Its corresponding wavelength at temperature 3300 K will be
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
On observing light from three different stars P , Q and R , it was found that intensity of violet colour is maximum in the spectrum of P , the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q . If Tp, TQ and TR are the respective absolute temperatures of P , Q and R , then it can be concluded from the above observations that :
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
Ordinary bodies A and B radiate maximum energy with wavelength difference 4 μm. The absolute temperature of body A is 3 times that of B. The wavelength at which body B radiates maximum energy is
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer

_____ is not necessary on radiation for heat transmission.

EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer

Define the following terms:

Infrared radiation

EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer

Give reason for the following:

A hot air balloon rises up in the sky. 

EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
Why are the ventilators provided near the ceiling of rooms?
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
_____ currents are produced when liquids and gases are heated.
MEDIUM
Physics>Change>Transformation>Thermal Energy and Heat Transfer
Why is a room heater placed near the floor and an air conditioner near the ceiling?
HARD
Physics>Change>Transformation>Thermal Energy and Heat Transfer
How can heat loss through radiation be reduced in a vacuum flask? Explain with a diagram.
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
Which of the following causes the formation of a convection current?
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
Which is fastest mode of heat transfer-Conduction, Convection or Radiation?
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer

A utensil, which is made of thick copper base, is placed on the gas burner to heat up water in it.

Explain why water would boil faster when a lid is placed on the utensil.

EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
Which form of matter does not transfer heat by convection?
MEDIUM
Physics>Change>Transformation>Thermal Energy and Heat Transfer
What is the atmospheric phenomenon that occurs in coastal regions due to the movement of warm and cool air? How do they differ from each other? 
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
Why is heat transfer by convection possible only in liquids and gases? 
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer
Hot water system and refrigerator also work on the same principle. How is their working similar? Explain.
EASY
Physics>Change>Transformation>Thermal Energy and Heat Transfer

Define the following term:

Land breeze