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Question
A sample of metal weighs 210 gm in air, 180 gm in water and 120 gm in liquid. Then relative density (RD) of
A sample of metal weighs 210 gm in air, 180 gm in water and 120 gm in liquid. Then relative density (RD) of
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Solution
The correct option is A Metal is 7, Liquid is 3
Density of metal = ρ, Density of liquid = σ
If V is the volume of sample then according to problem
210 = Vρg ..........(i)
180 = V(ρ−1)g ...........(ii)
120 = V(ρ−σ)g ...........(iii)
By solving (i), (ii) and (iii) we get ρ = 7 and σ = 3
Metal is 7, Liquid is 3
Density of metal = ρ, Density of liquid = σ
If V is the volume of sample then according to problem
210 = Vρg ..........(i)
180 = V(ρ−1)g ...........(ii)
120 = V(ρ−σ)g ...........(iii)
By solving (i), (ii) and (iii) we get ρ = 7 and σ = 3
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