Properties Of Matter Test

Result

Properties Of Matter Test - 6

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Question 1
1 / -0

If a piece of blue glass heated to a high temperature and a piece of red glass at room temperature are taken inside a dimly lit room, then

A
the blue piece will look blue and the red one will look as usual

B
the red piece will look brighter red and the blue one will look ordinary blue

C
the blue piece will look brighter red as compared to the red one

D
both the pieces will look equally red

Solution

As Stefan's law states that energy radiated per unit area per sec is directly proportional to the fourth power of the absolute temperature and good absorber is the good radiator also, blue glass has absorbed red colour, so it will radiate the absorbed radiations will look like brighter red as compared to the red piece at low temperature.
Question 2
1 / -0

Three objects coloured black, gray and white can withstand hostile conditions up to 2800°C. These objects are thrown into a furnace, where each of them attains a temperature of 2000°C. Which object will glow the brightest?

A
The white object

B
The black object

C
The gray object

D
All will glow with equal brightness

Solution

As a black coloured object is a perfect emitter and absorber of heat, so the black object will glow the brightest.
Question 3
1 / -0

An electric fan is switched on in a closed room. The air in the room

A
is cooled

B
is heated

C
maintains its temperature

D
is heated or cooled depending on the atmospheric pressure

Solution

When the electric fan is switched on, the electric energy is converted into mechanical energy, which in turn is converted into heat energy. It is so because the rotating fan in a closed room will increase the kinetic energy of translation of molecules of air in the room and hence, temperature of the room increases.