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ISRO built India’s first satellite, ______, which was launched by the Soviet Union on 19 April 1975.
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The vision of ISRO is to harness space technology for national development while pursuing space science research and planetary exploration.
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NASA sent a lunar orbiter, Chandrayan -1 on 22 October- 2008.
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Match the following:
| 1. | Galileo Galilei | a. | Earth is at the center |
| 2. | Heliocentric theory | b. | Dr. A.P.J. Abdul Kalam |
| 3. | Geo-centric theory | c. | Jupiter – a bound space probe |
| 4. | Missile man of India | d. | Sun is at the center |
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Write a note on ISRO.
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Polycot is a mixture of polyester and cotton.
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Name a synthetic fibre that works like wool?
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Name the form of polyester which is replacing materials like glass and is used for making bottles and jars.
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Which is the luminous part of the flame?
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Substances which vapourise during burning produce ______.
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Match the following:
| 1. | White flame | a. | Table salt |
| 2. | Indigo flame | b. | Bleaching powder |
| 3. | Blue flame | c. | Potassium chloride |
| 4. | Orange flame | d. | Epsom salt |
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Match the following:
| 1. | Inner zone | a. | Yellow |
| 2. | Outer zone | b. | Borax powder |
| 3. | Middle zone | c. | Blue |
| 4. | Green flame | d. | Black |
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Name a few substances which produce flames on burning.
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Write a note on flame.
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Explain the structure of a candle flame.
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Why is the candle flame straight?
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State true or false. If false, correct the statement.
Ginger is an underground root.
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______ is the most abundant gas in the atmosphere.
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Mercury: Liquid at room temperature:: Oxygen: ______.
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