Gravitation - 51 Questions You must Revise Q1: What was geocentric model? Who proposed this theory? Q2: What was heliocentric theory? Who proposed this? Q3: If the mass of the body is 9.8 kg on the earth what would be its mass on the moon. Q4: What are the Kepler Laws that govern the motion of the planets? Q5(NCERT/CBSE 2010): State the universal law of Gravitation. Q6(NCERT): What is