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Important Questions Test: Heat - Class 7 MCQ


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15 Questions MCQ Test Science Class 7 - Important Questions Test: Heat

Important Questions Test: Heat for Class 7 2024 is part of Science Class 7 preparation. The Important Questions Test: Heat questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Heat MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Heat below.
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Important Questions Test: Heat - Question 1

Which of the following devices is used for measurement of temperature of human body?

Detailed Solution for Important Questions Test: Heat - Question 1

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

Important Questions Test: Heat - Question 2

 In which mode of heat transfer does the transfer of heat occur as a wave?

Detailed Solution for Important Questions Test: Heat - Question 2

The transfer of heat occurs as a wave in Radiation.

Explanation:

In conduction, heat is transferred through direct contact of particles. This usually occurs in solids where the particles are closely packed and can easily transfer energy through vibrations.

In convection, heat is transferred through the movement of fluids (liquids and gases). The heated fluid becomes less dense and rises, and the cooler, denser fluid sinks. This cycle leads to heat transfer.

In radiation, heat is transferred in the form of electromagnetic waves. These waves can travel through vacuum, unlike conduction and convection which require a medium (solid, liquid, or gas). Therefore, the transfer of heat as a wave occurs in radiation.

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Important Questions Test: Heat - Question 3

Which of the following is a good conductor of heat?

Detailed Solution for Important Questions Test: Heat - Question 3

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.          

Important Questions Test: Heat - Question 4

In land breeze

Detailed Solution for Important Questions Test: Heat - Question 4

Explanation:
- 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.

Important Questions Test: Heat - Question 5

What happens at night in coastal areas in terms of air movement?

Detailed Solution for Important Questions Test: Heat - Question 5

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.

Important Questions Test: Heat - Question 6

Seema is in a hurry and wants her noodles to cool down faster. She should put it on a plate made of __________ .

Detailed Solution for Important Questions Test: Heat - Question 6
  • A metal plate due to its better thermal conductivity, draws heat faster from our hand than a plastic plate.
  • This makes us feel that the steel plate is colder than the plastic one.
Important Questions Test: Heat - Question 7

On a Fahrenheit scale

Detailed Solution for Important Questions Test: Heat - Question 7

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

Important Questions Test: Heat - Question 8
What is required for heat transfer by conduction?
Detailed Solution for Important Questions Test: Heat - Question 8
Conduction requires a medium through which heat can be transferred from one particle to another, typically occurring in solids.
Important Questions Test: Heat - Question 9
In which process is no medium required for the transfer of heat?
Detailed Solution for Important Questions Test: Heat - Question 9
Radiation does not require a medium for the transfer of heat; it can occur through a vacuum, as in the transfer of heat from the sun to the Earth.
Important Questions Test: Heat - Question 10
What happens when a wooden spoon is dipped in a cup of ice cream?
Detailed Solution for Important Questions Test: Heat - Question 10
- When a wooden spoon is dipped in ice cream, heat transfer occurs primarily through conduction.
- Conduction is the process where heat moves through a material without the material itself moving.
- Wood is a poor conductor of heat, meaning it doesn't easily transfer heat.
- As a result, the opposite end of the spoon stays warm while the end in the ice cream gets cold, but the cold does not significantly affect the other end.
Important Questions Test: Heat - Question 11
Why are stainless steel pans usually provided with copper bottoms?
Detailed Solution for Important Questions Test: Heat - Question 11
Copper is a better conductor of heat than stainless steel, which allows for more even heating and better cooking efficiency.
Important Questions Test: Heat - Question 12
What is the purpose of the kink in a clinical thermometer?
Detailed Solution for Important Questions Test: Heat - Question 12
The kink in a clinical thermometer prevents the mercury from falling back into the bulb, allowing the temperature to be read even after removing the thermometer from the body.
Important Questions Test: Heat - Question 13
Why are two layers of clothing warmer than a single layer of thick clothing in winter?
Detailed Solution for Important Questions Test: Heat - Question 13
Multiple layers of clothing trap air between them, and since air is a poor conductor of heat, it acts as an insulator, keeping the body warmer.
Important Questions Test: Heat - Question 14
Which material would you choose for the handle of a saucepan and why?
Detailed Solution for Important Questions Test: Heat - Question 14
Plastic is used for the handles of saucepans because it is a poor conductor of heat, making it safe to handle without the risk of burns.
Important Questions Test: Heat - Question 15
Why should the outer walls of houses in hot climates be painted white?
Detailed Solution for Important Questions Test: Heat - Question 15
White color reflects most of the heat from the sun, helping to keep the house cooler, which is beneficial in hot climates.
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