Density

Tested in 3 real MPSC questions across 2 years (2019–2021). See it in context on the interactive Concept Graph →

Years it was asked

2021 2019

What you need to know first

Basic chemistry symbolsMole conceptFormula of densityMass vs VolumeDefinition of densityUnits of measurement

Real questions that test this

कोष्टकात दिल्याप्रमाणे घनता असणाऱ्या सोन्यापासून आणि तांब्यापासून जर 0.50 kg. च्या समान वजनाचे दोन गोळे (चेंडू) बनवले तर / According to densities given in the table, if we prepare two spheres out of Gold and Copper each of a similar weight of 0.50 kg., then

1)सोन्याचा गोळा तांब्याहून मोठा असेल / The Golden sphere will be bigger than copper

2)सोन्याचा गोळा तांब्याहून लहान असेल / The Golden sphere will be smaller than copper&check; Correct

3)दोनों गोळे आकाराने समानच होतील / Both the spheres will be of same size

4)सोन्याचा गोळा तांब्याच्या तुलनेत बरोबर 19.30/8.96 एवढ्या आकाराचा होईल. / Golden sphere will be exactly 19.30/8.96 times than copper.

Density equals mass divided by volume (Density = Mass / Volume). Since gold has a much higher density than copper, for the same mass (0.50 kg), gold will occupy less volume, meaning the golden sphere is smaller.

जर पाण्याची घनता 1000 kgm⁻³ आणि तांब्याची घनता 8.9 × 10³ kgm⁻³ असेल तर तांब्याची सापेक्ष घनता किती ? If density of water is 1000 kgm⁻³ and density of copper is 8.9 × 10³ kgm⁻³. What is relative density of copper ?

a)8.9&check; Correct

b)8.9 kgm⁻³

c)8.9 × 10⁶

d)8.9 × 10⁻⁶

Relative density is the ratio of the density of a substance to the density of water. Since it's a ratio of identical units, it is a dimensionless quantity, making 8.9 the correct answer.

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