Please select a subject first
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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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Shrillness of a sound is determined by the ______ of vibration.
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A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.
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The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?
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Gurmit wanted to perform Activity 13.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher’s advice?
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Explain how you can take care of your eyes.
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What are the different ways in which water gets contaminated?
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Why does the increased level of nutrients in the water affect the survival of aquatic organisms?
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Forests and coal are ______ natural resources.
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What steps would you suggest for the judicious use of fuels?
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Read the following terms and select the pair that is related to inheritance of characters.
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Green colour of leaves is due to presence of the pigment ______.
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The thread-like structures present in the nucleus are
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Read the following statement and write the appropriate term against the statement.
I transfer characters from parents to offsprings. Who am I? ...................
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Lila always eats only dal and rice in every meal. She often falls ill and has become prone to diseases. Can you suggest changes in her diet which can make her healthy and free from disease?
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