Please select a subject first
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Explain in your own words with suitable examples.
How does excretion occur in human beings?
Concept: undefined >> undefined
Explain in your own words with suitable examples.
How is excretion in plants useful to human beings?
Concept: undefined >> undefined
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Form pairs.
| ‘A’ Groups | ‘B’ Groups | ||
| (i) | X-rays | (a) | GMRT |
| (ii) | Optical Telescope | (b) | ISRO |
| (iii) | Indian radio | (c) | Hubble |
| (iv) | Launching artificial satellites | (d) | Chandra |
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A certain X-ray telescope is named after scientist ______.
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Answer the following question in your own words.
Describe the structure of the DNA molecule.
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Answer the following question in your own words.
Express your opinion about the use of DNA fingerprinting.
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The number of molecules of water of crystallization in washing soda is ______.
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Give a scientific explanation.
The hard water of a well becomes soft on adding washing soda to it.
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Write the chemical formula.
Washing soda
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Write two physical properties which are given below.
Fullerene
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Why are concave mirrors used in solar devices?
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Why does obtaining the image of the sun on paper with the help of a concave mirror burn the paper?
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Which type of mirror is used in the following?
Floodlights
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Which type of mirror is used in the following?
Head lamps of a car
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Which type of mirror is used in the following?
Shaving mirror
Concept: undefined >> undefined
Match the first column with appropriate entries in the second and third columns and remake the table.
| S.No. | Column 1 | Column 2 | Column 3 |
| 1 | Negative acceleration | The velocity of the object remains constant. | A car, initially at rest reaches a velocity of 50 km/hr in 10 seconds. |
| 2 | Positive acceleration | The velocity of the object decreases. | A vehicle is moving with a velocity of 25 m/s. |
| 3 | Zero acceleration | The velocity of the object increases. | A vehicle moving with the velocity of 10 m/s, stops after 5 seconds. |
Concept: undefined >> undefined
Complete a sentence and explain it.
Deceleration is ______ acceleration.
Concept: undefined >> undefined
