Class 7th - Heat - Critical Approach

Choose the correct statement

• Infrared is a form of radiation which our eyes can easily see

• Infrared is a form of radiation which our eyes cannot see

When the sun goes down, the temperature of our atmosphere does not come down drastically. What is the main cause for this?

• Greenhouse gases trap the sunlight coming from sun

• Greenhouse gases trap the infrared radiations coming from earth surface

There are two boxes made of iron. Box A has a volume of 20 cm³ and Box B has a volume of 60 cm³ . Both boxes are now provided same amount of heat. Which box will have more temperature?

• Box A

• Box B

• Both box will have same temperature

A substance with a low specific heat requires relatively little heat to raise its temperature.

• True

• False

Temperature measures the amount of heat present in an object.

• True

• False

Heat and temperature are both form of energy.

• True

• False

If we increase the amount of greenhouse gases in the earth atmosphere, the average temperature of earth will:

• increase

• decrease

• will not change

Sea and land breeze happens because land has more specific heat capacity as compared to water in the oceans.

• True

• False

Choose the correct statement.

• Our eyes can see all forms of radiation

• Our eyes can see only two forms of radiation and that are x-rays and light

• Our eyes can see only one form of radiation and that is called light

• Our eyes can see only two forms of radiation and that is ultraviolet and light

You are given two substances A and B. Initially, the temperature of both substances is 20 degrees Celsius. You now give equal amounts of heat to both A and B. But, we see that the temperature of A is now 30 degrees and of B is 25 degrees. Based on this data, can you guess which substance will have more specific heat?

• Substance A

• Substance B

• Both have equal specific heat