Class 6 Exam  >  Class 6 Tests  >  Science Class 6  >  Olympiad Test: Air Around Us - Class 6 MCQ

Olympiad Test: Air Around Us - Class 6 MCQ


Test Description

20 Questions MCQ Test Science Class 6 - Olympiad Test: Air Around Us

Olympiad Test: Air Around Us for Class 6 2024 is part of Science Class 6 preparation. The Olympiad Test: Air Around Us questions and answers have been prepared according to the Class 6 exam syllabus.The Olympiad Test: Air Around Us MCQs are made for Class 6 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Air Around Us below.
Solutions of Olympiad Test: Air Around Us questions in English are available as part of our Science Class 6 for Class 6 & Olympiad Test: Air Around Us solutions in Hindi for Science Class 6 course. Download more important topics, notes, lectures and mock test series for Class 6 Exam by signing up for free. Attempt Olympiad Test: Air Around Us | 20 questions in 20 minutes | Mock test for Class 6 preparation | Free important questions MCQ to study Science Class 6 for Class 6 Exam | Download free PDF with solutions
Olympiad Test: Air Around Us - Question 1

Which of the following processes need oxygen?

Detailed Solution for Olympiad Test: Air Around Us - Question 1

Oxygen is necessary for combustion, respiration and oxidation.

Olympiad Test: Air Around Us - Question 2

Which of the following statements is true regarding the earth's atmosphere?

Detailed Solution for Olympiad Test: Air Around Us - Question 2

The density of air decreases with an increase in altitude.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Olympiad Test: Air Around Us - Question 3

When we heat water, we find bubbles coming from it. This shows that

Detailed Solution for Olympiad Test: Air Around Us - Question 3

Water contains dissolved air. Note: Sol ability of gases decreases on increase of temperature.

Olympiad Test: Air Around Us - Question 4

Which of the following plays a very important role in the oxygen cycle?

Detailed Solution for Olympiad Test: Air Around Us - Question 4

Plants play an important role in the oxygen cycle, as they release oxygen during the process of photosynthesis. Thus, they help in balancing the oxygen content in the atmosphere.

Olympiad Test: Air Around Us - Question 5

Mountaineers carry oxygen cylinders with them because

Detailed Solution for Olympiad Test: Air Around Us - Question 5

The density of air decreases with altitude, so the oxygen needed for breathing also decreases and becomes difficult to breathe. Hence, mountaineers carry oxygen cylinders.

Olympiad Test: Air Around Us - Question 6

Which of the following can show the direction of the wind?

Detailed Solution for Olympiad Test: Air Around Us - Question 6

A wind vane is used to find the direction of the wind.
An anemometer is an instrument that measures wind speed and wind pressure
A barometer is a tool used to measure atmospheric pressure,

Olympiad Test: Air Around Us - Question 7

Which of the constituents of air on increasing, causes global warming?

Detailed Solution for Olympiad Test: Air Around Us - Question 7

Carbon dioxide traps the reflected rays of the sun that fall on the earth's surface. This results in the increase of the earth's temperature, which is referred as global warming.

Olympiad Test: Air Around Us - Question 8

The percentage of water vapour present in air is called

Detailed Solution for Olympiad Test: Air Around Us - Question 8

The percentage of water vapour present in the air is called humidity.

Olympiad Test: Air Around Us - Question 9

Plants require nitrogen for

Detailed Solution for Olympiad Test: Air Around Us - Question 9

Plants require nitrogen for their growth and for the formation of proteins.

Olympiad Test: Air Around Us - Question 10

Which of the following gases cause the harmful greenhouse effect?

Detailed Solution for Olympiad Test: Air Around Us - Question 10

High levels of carbon dioxide in the atmosphere cause the harmful greenhouse effect.

Olympiad Test: Air Around Us - Question 11

The percentage of nitrogen in air is

Detailed Solution for Olympiad Test: Air Around Us - Question 11

The percentage of nitrogen in the air is 78%.

Olympiad Test: Air Around Us - Question 12

Breathing of air through our mouth is not hygienic because

Detailed Solution for Olympiad Test: Air Around Us - Question 12

If we breathe air through our mouth, the dust particles present in the air may enter the lungs and cause harm. But if the nose is used for breathing, the hair present in the nose filters the air and prevents the dust particles from entering the lungs.

Olympiad Test: Air Around Us - Question 13

Which of the following enables us to drink a liquid through a straw?

 

Detailed Solution for Olympiad Test: Air Around Us - Question 13

When a straw is used for drinking, air is expelled out from the straw due to which there is a decrease in the air pressure inside the straw. Therefore, the liquid in the container enters the straw, rises up and comes out from the straw. So, we are able to drink the juice/liquid. When we stop using the straw the process stops.

Olympiad Test: Air Around Us - Question 14

The humidity of a place

Detailed Solution for Olympiad Test: Air Around Us - Question 14

Humidity varies from time to time and from place to place. It is not fixed because it depends on the temperature of that place at that particular time.

Olympiad Test: Air Around Us - Question 15

Lime water turns milky when exposed to air. This shows that air contains

Detailed Solution for Olympiad Test: Air Around Us - Question 15

Carbon dioxide in air turns lime water milky.

Olympiad Test: Air Around Us - Question 16

The correct ascending order of gases as per their composition in air is

Detailed Solution for Olympiad Test: Air Around Us - Question 16

The correct ascending order of gases as per their composition in air is: hydrogen < oxygen < nitrogen. 

Olympiad Test: Air Around Us - Question 17

Air is useful for

Detailed Solution for Olympiad Test: Air Around Us - Question 17

Air is useful in many ways, like in the generation of electricity, the dispersal of seeds and in bird's flight.

Olympiad Test: Air Around Us - Question 18

Which of the following is combustible?

Detailed Solution for Olympiad Test: Air Around Us - Question 18

Hydrogen is a combustible gas. It burns with a pale blue flame.

Olympiad Test: Air Around Us - Question 19

Which of the following statements is true regarding the properties of air?

Detailed Solution for Olympiad Test: Air Around Us - Question 19

Air is transparent, a bad conductor of electricity and heat and also its composition varies from place to place.

Olympiad Test: Air Around Us - Question 20

Match the following terms in Column-l with those in Column-II correctly.

 

Detailed Solution for Olympiad Test: Air Around Us - Question 20

The correct combination is a - 4, b - 3, c - 2, d - 1
(i) Aquatic animals-Dissolved oxygen
(ii) Mountaineers-Oxygen cylinders
(iii) Factories-Soot and dust
(iv) Wind-Sail boat

99 videos|261 docs|49 tests
Information about Olympiad Test: Air Around Us Page
In this test you can find the Exam questions for Olympiad Test: Air Around Us solved & explained in the simplest way possible. Besides giving Questions and answers for Olympiad Test: Air Around Us, EduRev gives you an ample number of Online tests for practice

Top Courses for Class 6

99 videos|261 docs|49 tests
Download as PDF

Top Courses for Class 6