Density
Density is a Science & Technology concept from the MPSC syllabus, tested in 3 past MPSC questions (2019, 2021). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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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 (सारणीतील घनता / Densities from the table: सोने / Gold = 19.30 g/cm³, तांबे / Copper = 8.96 g/cm³.)
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 ?
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.