EASY
Earn 100

White clothes reflect the light of the sun.

50% studentsanswered this correctly

Important Questions on Heat

EASY

_____ is not necessary on radiation for heat transmission.

MEDIUM
What kinds of clothes are worn in winter? Why?
EASY
The woollen clothes keep us warm during winter because:
A. Wool is an insulator
B. Wool is a conductor
C. Wool traps air
D. Wool has vacuum
MEDIUM

What is the colour of a white object when the following coloured lights shine on it?

A mixture of red, blue and green

HARD
Explain how woollen clothes keep us warm during cold winter days. Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.
MEDIUM

A person has a white shirt and a black shirt. Which shirt will make him more comfortable in (a) winters, (b) summers? Give reason for your answer.

MEDIUM
Which would you prefer to keep you warm on a cold winter night: one thick woollen blanket or two thin woollen blankets joined together? Why?
MEDIUM
Why are the pipes of solar heater and the containers of solar cooker painted black?
EASY

Choose the correct word to fill the blank.

(burning, freezing)

When it is sunny, clothes keep the sun from _____ our skin.

MEDIUM

What is the colour of a white object when the following coloured lights shine on it?

 Red

MEDIUM

What is the colour of a white object when the following coloured lights shine on it?

Blue

MEDIUM
John and his family have to visit Kashmir from Delhi. What kind of clothes should they carry with them?
EASY
White clothes _____(reflect/absorb) sunlight.
MEDIUM
Why is the box of a solar cooker painted black from the inside?
EASY
What is the reason for making fire-fighting suits bright and shiny?
MEDIUM

What is the colour of a white object when the following coloured lights shine on it?

Green

EASY
A shiny surface absorbs most of the heat.
EASY
A solar heater is placed on the top of a roof to heat up the water tank. The surface of the heater is painted black. Why is that so? 
EASY
A piece of white paper and another of black paper are placed over the snow in sunshine. In which case the ice would melt faster?