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The system of irrigation where in water is supplied drop by drop near the roots of plants, is called ______.
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A bucket made of plastic does not rust like a bucket made of iron. Why?
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In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is
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In markets, eggs of birds are available but never eggs of dogs. why?
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The eggs of frogs do not have shells for protection, yet they are safe in water, how?
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State whether the following statement is True or False. If false, correct the statement:
External fertilisation can occur both in water and on land.
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State whether the following statement is True or False. If false, correct the statement:
The eggs of fish are covered by hard shells for protection.
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State whether the following statement is True or False. If false, correct the statement:
Human egg has a head, middle piece and tail.
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Which one of the following forces is a contact force?
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Where do we apply a force while walking?
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An archer shoots an arrow in the air horizontally. However, after moving some distance, the arrow falls to the ground. Name the initial force that sets the arrow in motion. Explain why the arrow ultimately falls down.
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Two rods of the same weight and equal length have different thickness. They are held vertically on the surface of sand as shown in figure. Which one of them will sink more? Why?
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How is sound produced and how is it transmitted and heard by us?
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State whether the following statement is True or False.
Bathing outdoors should be avoided during thunderstorm.
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Mention three precautions that you will take to protect yourself if earthquake strikes when you are inside the house.
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Describe two methods of irrigation which conserve water.
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The following Table shows the total power shortage in India from 1991 − 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.
| S. No | Year | Shortage (%) |
| 1 | 1991 | 7.9 |
| 2 | 1992 | 7.8 |
| 3 | 1993 | 8.3 |
| 4 | 1994 | 7.4 |
| 5 | 1995 | 7.1 |
| 6 | 1996 | 9.2 |
| 7 | 1997 | 11.5 |
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If the amplitude of vibration is large, sound is feeble.
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The lower the frequency of vibration, the higher is the pitch.
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Loudness is determined by the __________ of vibration.
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