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.

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

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Albumin dissolves in salt solution and egg becomes lighter
Water has high surface tension
Egg absorbs salt from the solution and expands
The density of salt solution exceeds the density of eggs

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