(a)Take a piece of thin sheet of polythene from any used packaging bag. Hold it close to your mouth and suck-in the air. What do you observe? The sheet sticks to the lips and gets pulled inwards. Why is it so? That is because the air outside exerts pressure inwardly. (b) Take a balloon and blow it uRead more
(a)Take a piece of thin sheet of polythene from any used packaging bag. Hold it close to your mouth and suck-in the air. What do you observe? The sheet sticks to the lips and gets pulled inwards. Why is it so? That is because the air outside exerts pressure inwardly.
(b) Take a balloon and blow it up. Press it gently. You have to apply some force to press it. What is exerting pressure from inside? This is the air inside that exerts pressure.
The direction can be found by the following two methods– (a) Look at branches of a tree. The direction in which the branches are moving is the direction of wind. (b) Hold a light long piece of cloth. Observe the direction in which it sways. The direction in which the piece of cloth sways is the direRead more
The direction can be found by the following two methods–
(a) Look at branches of a tree. The direction in which the branches are moving is the direction of wind.
(b) Hold a light long piece of cloth. Observe the direction in which it sways. The direction in which the piece of cloth sways is the direction of wind.
Which of the followings statements are true for acids ?
[C] Sour and change blue litmus to red Property of acids is that it is sour in taste and change blue litmus to red.
[C] Sour and change blue litmus to red
See lessProperty of acids is that it is sour in taste and change blue litmus to red.
Why do banners and flags flutter?
Air exerts pressure because of which banners and flags flutter.
Air exerts pressure because of which banners and flags flutter.
See lessState two experiences that made you think that air exerts pressure (other than those given in the text)
(a)Take a piece of thin sheet of polythene from any used packaging bag. Hold it close to your mouth and suck-in the air. What do you observe? The sheet sticks to the lips and gets pulled inwards. Why is it so? That is because the air outside exerts pressure inwardly. (b) Take a balloon and blow it uRead more
(a)Take a piece of thin sheet of polythene from any used packaging bag. Hold it close to your mouth and suck-in the air. What do you observe? The sheet sticks to the lips and gets pulled inwards. Why is it so? That is because the air outside exerts pressure inwardly.
See less(b) Take a balloon and blow it up. Press it gently. You have to apply some force to press it. What is exerting pressure from inside? This is the air inside that exerts pressure.
Suggest two methods to find out wind direction at a given place
The direction can be found by the following two methods– (a) Look at branches of a tree. The direction in which the branches are moving is the direction of wind. (b) Hold a light long piece of cloth. Observe the direction in which it sways. The direction in which the piece of cloth sways is the direRead more
The direction can be found by the following two methods–
See less(a) Look at branches of a tree. The direction in which the branches are moving is the direction of wind.
(b) Hold a light long piece of cloth. Observe the direction in which it sways. The direction in which the piece of cloth sways is the direction of wind.
Does the time of sunrise and sunset remain the same in summer and winter?
No. Sun rises early in summer and sets early in winter.
No. Sun rises early in summer and sets early in winter.
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