Important Questions Test: Heat - Class 7 MCQ

To measure temperature of human body we use clinical thermometer or doctor's thermometer.

In radiation, heat energy is transferred in the form of electromagnetic waves (infrared waves), and it does not require a medium to travel. For example, the heat from the Sun reaches Earth through radiation.

Aluminum is a good conductor of heat. Aluminum has a high thermal conductivity. Wood is a poor conductor of heat (as well as other forms of energy) because it is covalently bound as a compound.          

Cold air moves from land towards sea during night: Land breeze occurs at night when the land cools down faster than the sea. As a result, the air above the land becomes cooler and denser, creating high pressure. The cooler air moves towards the warmer sea, creating a breeze that blows from the land towards the sea. This phenomenon is known as a land breeze.

At night, the land cools down faster than the water. The cooler air over the land moves towards the sea, which is called the land breeze.

- Seema should put her noodles on a metal plate to cool them down faster.
- Metal is an excellent conductor of heat. It quickly transfers heat away from the noodles to the surrounding environment.
- Other materials like wood, paper, and plastic are poor conductors. They insulate and retain heat, causing the noodles to cool down more slowly.

On a Fahrenheit scale:
(i) Boiling point of water is 212^∘F.
(ii) The temperature will be equal to that on the Celsius scale at −40^∘C.
(iii) The difference between the upper fixed point and the lower fixed point is divided into 180 equal parts.