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The table shown below gives information about four substances: A, B, C and D.
| SUBSTANCE | MELTING POINT (K) | ELECTRICAL CONDUCTIVITY | |
| SOLID | LIQUID/ AQUEOUS | ||
| A | 295 | Good | Good |
| B | 1210 | Poor | Good |
| C | 1890 | Poor | Good |
| D | 1160 | Poor | Poor |
Identify Ionic compounds from the above given substances.
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Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.
The substance not likely to contain CaCO3 is:
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Identify the correct statement from the following:
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Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?
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Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why?
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Why do we see a rainbow in the sky only after rainfall?
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In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q’ respectively are:
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State the colour which bends:
- The most.
- The least while passing through a glass prism.
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What is atmospheric refraction? Use this phenomenon to explain the following natural events:
Twinkling of stars
Draw diagrams to illustrate your answers.
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What is atmospheric refraction? Use this phenomenon to explain the following natural events:
Advanced sun-rise and delayed sun-set.
Draw diagrams to illustrate your answers.
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Explain why the planets do not twinkle.
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The correct sequencing of angle of incidence, angle of emergence, angle of refraction and lateral displacement shown in the following diagram by digits 1, 2, 3 and 4 is:
(a) 2, 4, 1, 3
(b) 2, 1, 4, 3
(c) 1, 2, 4, 3
(d) 2, 1, 3, 4
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Name the phenomenon which causes the twinkling of stars.
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Name two effects produced by the atmospheric refraction.
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Atmospheric refraction causes advance sunrise and delayed sunset. By how much time is:
sunrise advanced?
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Atmospheric refraction causes advance sunrise and delayed sunset. By how much time is:
sunset delayed?
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State whether the following statement is true or false:
The planets twinkle at night due to atmospheric refraction of light.
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Fill in the following blank with suitable word:
We can see the sun about ................ minutes before the actual sunrise and about ................ minutes after the actual sunset because of atmospheric ................
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Why do stars seem higher than they actually are? Illustrate your answer with the help of a diagram.
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What is atmospheric refraction?
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