Physics
Working of safety fuses depends upon1. magnetic effect of the current2. chemical effect of the current3. magnitude of the current4. heating effect of the currentSelect the correct answer using the code given below.

1, 2 and 3 only
3 and 4 only
1, 2, 3 and 4
4 only

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Physics
Specific gravity is defined as the ratio of

Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 4°C
Density of the substance to the density of water
Density of the substance to the density of water at 0°C

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