7. Density of ice is
ρ and that of water is σ . What will be the decrease in volume when a mass M of ice melts
(a) M/( σ – ρ ) (b) ( σ – ρ ) /M
(c) M[(1/ρ/) -(1/σ)] (d) [1/M][(1/ρ/) -(1/σ)]
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a