Test: Heat - UPSC MCQ

# Test: Heat - UPSC MCQ

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## 25 Questions MCQ Test Science & Technology for UPSC CSE - Test: Heat

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

### Why do we feel more comfortable wearing light-colored clothes in the summer?

Detailed Solution for Test: Heat - Question 1

In the summer, we feel more comfortable wearing light-colored clothes because they reflect most of the heat that falls on them. This keeps us cooler compared to dark-colored clothes, which absorb more heat. So, when it's hot outside, light-colored clothes help us stay cool!

Test: Heat - Question 2

### What is the range of the temperature reading of a laboratory thermometer?

Detailed Solution for Test: Heat - Question 2

The range of the temperature reading of a laboratory thermometer -10°C – 110°C.

Test: Heat - Question 3

### Heat always flows:

Detailed Solution for Test: Heat - Question 3

Heat is always the transfer of energy from an object at a higher temperature to an object at a lower temperature.

Test: Heat - Question 4

State whether the following statement is True or False:

We can determine the temperature of any object through our sense of touch.

Detailed Solution for Test: Heat - Question 4

Our sense of touch is relative. We can't use it to determine the hotness or coldness of every object because we can't touch too hot objects as we might burn our fingers thus the given statement is false.

We can only tell whether the substance that we are touching is hotter or colder than our body comparatively but we can not tell the temperature.For that we use thermometer.

Test: Heat - Question 5

What is the purpose of a laboratory thermometer?

Detailed Solution for Test: Heat - Question 5
• A laboratory thermometer is used to measure the temperatures of liquids and objects. It helps us know how hot or cold something is.
• Imagine using it to check how warm your cup of hot chocolate is or how cold the ice cream in your freezer is.
• So, a laboratory thermometer is like a special tool to tell us how hot or cold things are around us.
Test: Heat - Question 6

Beaker A contains hot water. Beaker B contains cold water. Beaker C contains a mixture of hot and cold water. If initially your hand is put into a beaker containing ice, then putting your hand in which of the beakers A, B or C will give a sensation of warmth?

Detailed Solution for Test: Heat - Question 6

We know that ice is solid form of water which is at 0oC. And all other forms given in question are liquid forms and all liquid forms are above melting point of water that is 0oC. So compared to ice, all beakers are comparatively at higher temperature and will give sensation of warmth to our hand when we put our hand in any of these beakers after putting it in ice because they are at higher temperature than ice.

Test: Heat - Question 7

Heat of sun reaches to earth by:

Detailed Solution for Test: Heat - Question 7

The heat from the Sun reaches us through the process of radiation. The radiant heat travels similar to the speed of light.

There are millions of miles of empty space between the Earth and the Sun. Therefore, only through radiation can heat be transferred to the Earth from the Sun, as it does not require any medium.

Test: Heat - Question 8

Which of the following statements is true?

Detailed Solution for Test: Heat - Question 8

In the day-time, the sun heats both the land and the sea. Land heats up more quickly than the water. Hence, it is hotter than the sea. As you know, hot air is lighter than the cold air. Therefore, warm air above the land rises. The cool air from the sea comes in to take its place. This is known as sea breeze. It cools the land near the coast.

At night, the water cools down more slowly than the land. So, the cool air from the land moves towards the sea.This is called the land breeze. Hence correct option is C.

Test: Heat - Question 9

When the pan is removed from the fire, it slowly ___________ down.

• cools
• heats
• freezes
• floats
Detailed Solution for Test: Heat - Question 9

When the pan is taken away from the fire, it gradually cools down. This means it loses heat and becomes colder.

Test: Heat - Question 10

Choose the correct statement when we measure the temperature of water kept in a beaker:

Detailed Solution for Test: Heat - Question 10

While measuring temperature, the laboratory thermometer should be held vertically. It should be surrounded from all sides by the substance(water in this case) whose temperature is to be measured and hence, it should not touch the sides or the bottom of the beaker.

Hence, option C is correct.

Test: Heat - Question 11

The materials that conduct heat are known as ___ and the materials that do not conduct heat easily are known as ___.

Detailed Solution for Test: Heat - Question 11

The materials which allow heat to pass through them easily are conductors of heat. Examples: aluminum, iron, and copper.
The materials which do not allow heat to pass through them easily are poor conductors of heat and are known as insulators. Examples: plastic and wood.

Test: Heat - Question 12

State whether the following statement is True or False

When water is heated, the cold water from the sides moves up towards the source of heat.

Detailed Solution for Test: Heat - Question 12

It's False. When water is heated, the hot water rises up while the cold water moves down towards the source of heat. This is because heat makes the water expand and become lighter, causing it to rise. So, the cold water doesn't move up, it moves down.

Test: Heat - Question 13

What is the device used to measure temperature?

Detailed Solution for Test: Heat - Question 13

A thermometer is a device that helps us measure how hot or cold something is. It can tell us if something is hot like the sun or cold like ice. So, when we want to know how hot or cold something is, we use a thermometer to find out.

Test: Heat - Question 14

The heat in metals is conducted by the process of:

Detailed Solution for Test: Heat - Question 14

The heat in metals is conducted by the process of conduction in which molecules in contact, transfer heat to adjacent molecules.

Test: Heat - Question 15

When water is heated, the water near the flame gets ____.

Detailed Solution for Test: Heat - Question 15

When water is heated, the water near the flame gets hot. Heat makes the water warmer. So, the right word is 'hot'.

Test: Heat - Question 16

What is a device used for measuring temperature?

Detailed Solution for Test: Heat - Question 16

A thermometer is a tool used to measure temperature. It helps us understand how hot or cold something is.

Test: Heat - Question 17

What is the name of the process by which heat is transferred from the hotter end to the colder end of an object?

Detailed Solution for Test: Heat - Question 17
• When heat moves from a hot part of something to a cooler part, we call this process "conduction." It's like when you touch something hot at one end, and the heat travels to the other end.
• Heat can pass through things like metals very easily, but not so well through materials like plastic or wood.
Test: Heat - Question 18

Thermos flask keeps hot liquid hot and cold liquid cold by:

Detailed Solution for Test: Heat - Question 18

Thermos flask containers have two-layer and there is a vacuum between two layers to prevent heat loss to keep hot liquids hot and cold liquid cool.

Test: Heat - Question 19

Which one of the following metals is filled in the bulb of a thermometer?

Detailed Solution for Test: Heat - Question 19

A glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale.

Test: Heat - Question 20

How does heat reach us from the sun in space?

Detailed Solution for Test: Heat - Question 20

Heat from the sun reaches us by moving in a straight line. It doesn't need any air or anything to travel through space. It just goes straight and warms us up when it reaches us.

Test: Heat - Question 21

State whether the following statement is True or False:

We feel more comfortable wearing light-colored clothes in the summer.

Detailed Solution for Test: Heat - Question 21

When it's hot outside, light-colored clothes help us feel more comfortable. Light colors reflect most of the heat that falls on them, so we don't feel as warm as we would in dark-colored clothes.

Test: Heat - Question 22

State whether the following statement is True or False

Heat always flows from a colder object to a hotter object.

Detailed Solution for Test: Heat - Question 22
• When we talk about heat, it actually flows from a hotter object to a colder object, not the other way around.
• Imagine you have a hot cup of tea and a cold ice cube.
• If you put the ice cube in the tea, the heat from the tea moves to the ice cube, making the ice cube melt.
• This shows that heat moves from hot things to cold things.
• So, the statement is False.
Test: Heat - Question 23
Woollen clothes keep us warm during _______.
Detailed Solution for Test: Heat - Question 23
Woollen clothes keep us warm during winter because they provide insulation and help retain body heat when it's cold outside.
Test: Heat - Question 24

State whether the following statement is True or False:

The laboratory thermometer is suitable for measuring body temperature.

Detailed Solution for Test: Heat - Question 24

False . The laboratory thermometer is not suitable for measuring body temperature. It is used to measure the temperature of objects like water and air, not the human body.

Test: Heat - Question 25

Boojho wanted to measure the temperature of hot milk using a ________.

Detailed Solution for Test: Heat - Question 25

Boojho wanted to measure the temperature of hot milk using a Laboratory thermometer. Paheli stopped him from doing so because a clinical thermometer is meant for measuring human body temperature, not for objects like hot milk or water.

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