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Explain why do vegetables and fruits get damaged during severe frost?
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A deep pond of water has its top layer frozen. What will be the likely temperature of water layer just in contact with ice?
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A deep pond of water has its top layer frozen. What will be the likely temperature of water layer at the bottom of the pond?
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What are hot spots? How can you extract energy from a hot spot, if it does not come in contact with underground water?
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Draw a neat and labelled diagram of a simple voltaic cell showing clearly the direction of flow of conventional current and direction of flow of electrons.
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Briefly describe the theory of simple voltaic cell.
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Why do lines of magnetic force never cross? Why do they never pass through a neutral point?
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Give the various methods for demagnetizing a magnet.
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What is the number of electrons that would flow per second through the cross-section of a wire when 1 A current flows in it?
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0.7 C charges passes through a cross-section of a conductor in 7 s. Find the current.
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Different bars are brought near each pole of a compass needle. Complete the following table:
| Nature of bar | Action on the compass needle | |
| North pole | South pole | |
| (i) Glass | No action | __________ |
| (ii) _________ | Attracted | Attracted |
| (iii) North pole of a bar magnet | __________ | ___________ |
| (iv) The south pole of a bar magnet | __________ | repulsion |
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