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Explain the following:
Lime water turns milky on passing carbon dioxide gas into it.
Concept: undefined >> undefined
Explain the following:
Bubbles are produced when acetic acid is added to a solution of sodium hydrogencarbonate.
Concept: undefined >> undefined
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Give an example of a chemical reaction for the following situation:
Sound is produced
Concept: undefined >> undefined
Following are precautions one must take in case a storm is accompanied by lightning.
- Do not take shelter under a tree.
- Do not take shelter under an umbrella with a metallic end.
- Do not take shelter in open garages, storage sheds, etc.
- Do not take shelter in a bus in the open.
Which one of these is not correct?
Concept: undefined >> undefined
Air around us exerts ______.
Concept: undefined >> undefined
The moving air is called ______.
Concept: undefined >> undefined
State whether the following statement is True or False:
Warm air is lighter than cool air.
Concept: undefined >> undefined
To expel hot air out of the kitchen, ‘A’ has an exhaust fan fitted on the window of her kitchen and ‘B’ has a similar exhaust fan fitted on the wall near the ceiling of her kitchen. Which of the exhaust fan will expel the hot air more effectively? Explain why?
Concept: undefined >> undefined
Match Column I with Column II. There can be more than one match.
| Column I | Column II | ||
| (a) | on heating air | (i) | descends |
| (b) | on cooling air | (ii) | expands |
| (iii) | contracts | ||
| (iv) | rises | ||
Concept: undefined >> undefined
Describe an activity to demonstrate that warm air is lighter than cool air
Concept: undefined >> undefined
The picture in figure shows tree line along the sea coast on an island near the equator. As shown, the tree tops are permanently bent in one direction. Are the trees bent towards the sea or away from it? Explain.
Concept: undefined >> undefined
Read the following statement and give the appropriate terms for them.
Removal of top soil during heavy rains or strong winds
Concept: undefined >> undefined
Unscramble the following words:
TBTAYER
Concept: undefined >> undefined
Draw the symbols of the following circuit components.
Battery
Concept: undefined >> undefined
Which of the following can be used to form a real image?
Concept: undefined >> undefined
Which of the following is/are products of wastewater treatment?
Concept: undefined >> undefined
The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as
Concept: undefined >> undefined
Which of the following is not a source of waste water?
Concept: undefined >> undefined
State whether the following statement is True or False. In case a statement is false, write the correct statement.
Sewage is a solid waste which causes water pollution and soil pollution
Concept: undefined >> undefined
