Quiz on Gravitation Test 7 ( physics ) Welcome to your Quiz on Gravitation Test 7 ( physics ) Name Email 1.The force of the Earth’s gravity on every kilogram is about: (a) 20 N (b) 10 N (c) 5 N (d) 15 N None 2.Which law explains about the tides due to the moon and the sun? (a) Law of gravitation (b) Law of reflection (c) Law of inertia (d) Law of refraction None 3.Who among the following was the first to conclude that in vacuum all objects fall with the same acceleration g and reach the ground at the same time? (a) Thomas Alva Edison (b) Galileo Galilei (c) Albert Einstein (d) Isaac Newton None 4.Who among the following is credited with postulating three laws of planetary motion? (a) Isaac Newton (b) Tycho Brahe (c) Johannes Kepler (d) Galileo Galile None 5.Which among the following is an ‘action-at-a-distance’ force? (a) Friction (b) Tension (c) Gravitation (d) Pull None 6.Which instrument was used to detect gravitational waves for the very first time? (a) WIGO (b) LIGO (c) TRIGO (d) GIGO None 7. What is the value of g ? (g stands for acceleration due to gravitational force of the earth ) (a) 5.2 m/s 2 (b) 9.8 m/s 2 (c) 7.8 m/s 2 (d) 6.7 m/s 2 None 8.Which of the following helps keep earth's atmosphere in place? (a) Gravitational force of earth (b) Rotation of earth on its axis (c) Gravitational force of the sun (d) Gravitational force of the moon None 9.Once a satellite has been launched into orbit, the only force governing its motion is the force of ______ . (a)gravity (b) elasticity (c) friction (d) fuel drive None 10. Kepler’s first law is known law of _______ ? (a) Ellips (b) Harmonis (c) Motion (d) Equal Area None Time's up
