Air
Category : 1st Class
Air is a natural resource, which we use for breathing.
Where does air exist?
(a) Only in our room (b) Only in an empty glass
(c) Everywhere (d) Only in an empty cup
Answer: (c)
Explanation
Option (C) is correct. Therefore, rest of the options is incorrect.
What is the colour of air?
(a) Red (b) Yellow
(c) Blue (d) Colourless
Answer: (d)
Explanation
Option (D) is correct because air does not have color. Therefore, rest of the options is incorrect.
The moving air is called wind.
What is wind?
(a) Space of the air (b) Volume of the air
(c) Weight of the air (d) Movement of the air
Answer: (d)
Explanations
Option (D) is correct. Therefore, rest of the options is incorrect.
A light wind does not shake__________.
(a) Leaves (b) Clothes
(c) Piece of paper (d) Building
Answer: (d)
Explanation
Option (D) is correct because, light wind does not shake building.
Therefore, rest of the options is incorrect.
Air is a mixture of the following gases:
The air present in atmosphere consists of 78 percent nitrogen, 21 percent oxygen and remaining 1 percent is of other gases.
Which one of the following is a true statement?
(a) Air is the mixture of solid things
(b) Air is the mixture of liquid things
(c) Air is the mixture of gases
(d) Air is the mixture of food items
Answer: (C)
Explanation
Option (C) is correct because, this is a true statement. Therefore, rest of the options is incorrect.
Which of the following is not a part of air?
(a) Hydrogen
(b) Apple
(c) Nitrogen
(d) Oxygen
Answer: (b)
Explanation
Option (B) is correct because, it is a fruit. Therefore, rest of the options is incorrect.
Followings are the uses of air:
Living things will ____ without air.
(a) Live
(b) Walk
(c) Talk
(d) Die
Answer: (d)
Explanation
Option (D) is correct because, living things inhale air to live. Therefore, rest of the options is incorrect.
Which one of the following is filled with air?
(a) Table
(b) Balloon
(c) Chair
(d) Mobile
Answer: (b)
Explanation
Option (B) is correct because we use air to fill balloon. Therefore, rest of the options is incorrect.
The force, which air is exerting upon us, is called the weight of the air. To understand it we can take the example of a football without air. When we start filling it with air, it gets heavier. Same things happen when the wheels of buses, cars, and cycles are filled with air. Hence we can say that air has weight.
Weight of air means _________.
(a) Force
(b) Mass
(c) Energy
(d) All of these
Answer: (a)
Explanation
Option (A) is correct because weight means force exerted. Therefore, rest of the options is incorrect. A balloon is filled with air.
A balloon is filled with air. What change will it make to the weight of the balloon?
(a) Decrease
(b) Increase
(c) No change
(d) All of these
Answer: (b)
Explanation
Option (B) is correct because air has weight. So it will increase the weight of balloon- Therefore, rest of the options is incorrect.
We know that air is everywhere. Thus, every living and nonliving things are rapped up in air. We can better understand it with the example of a balloon. When we start filling air in a flat balloon with our mouth, it increases in size.
That means air has occupied the space inside the balloon, thereby increasing its size.
Similarly, air occupies empty space inside a football, wheels of cycles, cars, etc.
Further, air also occupies space in a room, empty glass, empty bowl, etc.
Which one of the following is filled with air?
(a) Solid sphere
(b) Empty basket
(c) A solid iron rod
(d) A tree stem
Answer: (b)
Explanation
Option (B) is correct, because we know that air occupies ail the empty space. Therefore, rest of the options is incorrect.
A balloon increases in size, because _______ inside it.
(a) Air is filled into it
(b) Water is filled into it
(c) Fire filled into it
(d) Anger filled into it
Answer: (a)
Explanation
Option (A) is correct, because air occupies empty space inside a balloon, thereby increasing its size. Therefore, rest of the options is incorrect.
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