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- 1. Multiple Choice
Leaves of trees,and flags flutter when wind is blowing because
Air is a mixture of gases
Air occupies space
Air exerts pressure
Air is colourless
- 2. Multiple Choice
When we blow over a paper strip it goes upward because
Blowing over the paper reduces the air pressure above the strip
Blowing over the paper increases the air pressure above the strip
Air moves up
None of these
- 3. Multiple Choice
When we blow between the two balloons ,what will happen?
Balloons will move closer to each other
Balloons will move away from each other
Balloons will move remain in their original position
cannot say
- 4. Multiple Choice
Air moves from
region of low pressure to high pressure
region of high pressure to low pressure
does not depend upon pressure
air does not move
- 5. Multiple Choice
The warm air is
lighter than the cold air
heavier than the cold air
equal to the weight of cold air
none of the above
- 6. Multiple Choice
A curtain is hanging at the entrance of a room. A long corridor runs at right angles to the door, that is parallel to the curtain. If a strong wind blows along the corridor, the curtain will
get pushed inside the room.
get pushed outside the room.
get collected towards one end/swirled.
remain unaffected.
- 7. Multiple Choice
Increased wind speed
does not affect air pressure
reduces air pressure
increases air pressure
none of the above
- 8. Multiple Choice
Anoop Appeared In Class Test But He Confused To Know The Incorrect Statement. Would You Help Him To Know That?
While riding a cycle, we find that it is easier to move the bicycle forward if the wind is coming from our back side.
While rowing a boat in the lake, we find it easier to row the boat forward if the wind is coming from behind us.
When we are flying a kite, then the wind coming from our back side helps.
f the wind blows in opposite direction to the motion of the object, it makes the movement of the object easier.
- 9. Multiple Choice
Indu Is Writing Some Statements But She Confused To Know Whether The Statements Are Correct Or Not? If You Know The Answer To This Question, Then Tell Her:
When air is heated its volume increases and it occupies a bigger space.
When air gets cooled, then its volume decreases and it occupies a smaller space.
If the wind blows in same direction in which the object is moving, it makes the movement of object difficult.
None of the above
- 10. Multiple Choice
Which Of The Following Statement Is Or Are Correct?
Air expands on heating.
Hot air is lighter than cold air.
Smoke always rises up.
All the above
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