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Important Questions Test: Heat


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20 Questions MCQ Test General Science(Prelims) by IRS Divey Sethi | Important Questions Test: Heat

Important Questions Test: Heat for Class 7 2022 is part of General Science(Prelims) by IRS Divey Sethi 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 2022 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

The direction of flow of heat is

Detailed Solution for Important Questions Test: Heat - Question 1

Heat transfers from hotter objects to cooler object. That happens because the molecules hit each other, and the faster moving molecules in the hot object spread that energy into the cooler object.

Important Questions Test: Heat - Question 2

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

Detailed Solution for Important Questions Test: Heat - Question 2

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

Important Questions Test: Heat - Question 3

The clinical thermometers presently in use in India are marked with a temperature scale. This scale corresponds to which of the following?

Detailed Solution for Important Questions Test: Heat - Question 3

The scale presently used in India for clinical thermometer is Celsius scale.     

Important Questions Test: Heat - Question 4

The normal temperature of human body is

Detailed Solution for Important Questions Test: Heat - Question 4

Normal temperature of human body is

37C

Important Questions Test: Heat - Question 5

The flow of heat by conduction is generally observed in case of

Detailed Solution for Important Questions Test: Heat - Question 5

In solids heat flows from one part of the solid to another part by conduction. 

Important Questions Test: Heat - Question 6

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

Detailed Solution for Important Questions Test: Heat - Question 6

In radiation heat is transferred as a wave.      

Important Questions Test: Heat - Question 7

One feels sensation of heat when exposed to

Detailed Solution for Important Questions Test: Heat - Question 7

Infrared rays are also known as heat waves. Greenhouse gases reflect the heat in the form of infra red rays . So, infrared rays are very important to global warming.

Important Questions Test: Heat - Question 8

Which of the following is a good conductor of heat?

Detailed Solution for Important Questions Test: Heat - Question 8

Aluminum is a good conductor of heat.          

Important Questions Test: Heat - Question 9

 In sea breeze

Detailed Solution for Important Questions Test: Heat - Question 9

Sea breezes occur during hot, summer days because of the unequal heating rates of land and water. During the day, the land surface heats up faster than the water surface. Therefore, the air above the land is warmer than the air above the ocean. As a result, cold air moves from sea towards land during day Time.

Important Questions Test: Heat - Question 10

In land breeze

Detailed Solution for Important Questions Test: Heat - Question 10

cold air moves from land towards sea during night.

Important Questions Test: Heat - Question 11

Mercury is generally used in thermometer because it has a

Detailed Solution for Important Questions Test: Heat - Question 11

Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.

Important Questions Test: Heat - Question 12

Nights are cooler in the deserts because

Detailed Solution for Important Questions Test: Heat - Question 12

sand radiates heat more quickly as compared to earth

Important Questions Test: Heat - Question 13

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 13

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 14

On a Fahrenheit scale

Detailed Solution for Important Questions Test: Heat - Question 14

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 15

Expansion of a substance on heating depends on

Detailed Solution for Important Questions Test: Heat - Question 15

Thermal expansion is the change in size of an object as its temperature changes, Normally as the temperature increases, the size of an object also increases. Hence expansion of a substance on heating depends on nature of substance and rise in temperature.

Important Questions Test: Heat - Question 16

On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?

Detailed Solution for Important Questions Test: Heat - Question 16

Lid expands more than the neck and thus slides easily

Important Questions Test: Heat - Question 17

Process of change of state from gaseous state to liquid state is called

Detailed Solution for Important Questions Test: Heat - Question 17

Condensation is the process by which water vapor in the air is changed into liquid water.

Important Questions Test: Heat - Question 18

When two bodies at different temperatures are placed in thermal contact with each other, heat flows from the body at higher temperature to the body at lower temperature until them both acquire the same temperature. Assuming that there is no loss of heat to the surroundings, the heat

Detailed Solution for Important Questions Test: Heat - Question 18

the heat lost by the hotter body will be equal to the heat gained by the colder body.

Important Questions Test: Heat - Question 19

We receive heat energy from the sun through ______ mode of transmission

Detailed Solution for Important Questions Test: Heat - Question 19

Since there is no medium between sun and earth heat can travel only through radiation.

Important Questions Test: Heat - Question 20

Conduction is possible

Detailed Solution for Important Questions Test: Heat - Question 20

Conduction is only possible when the bodies in contact have a temperature difference; heat flows from the body with higher temperature to that of lower temperature, till the bodies are in thermal equilibrium. 

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