(66) A ball thrown up vertically returns to the thrower after 6 sec. He finds that the iron ball reaches the ground much earlier than the feather. (57) What is the acceleration of free fall? C: 6.67 * 10-8 cgs unit Here, \(u = 0\), \(S = - 19.6m\), g= \( - 10m. State the B: Zero These MCQ's are extremely critical for all CBSE students to score better marks. Q.8> If speed of rotation of earth increases then what would be the value of weight of a body? D: Magnetic force. D: mass remain constant but weight will be changed. () What is the acceleration due to gravity on the moon? C: Weight of a body remain constant Define : gravitation, gravity and gravitational force. (62) A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity just before touching the ground. Explain. (61) A ball is thrown vertically upward with a velocity of 49 m/s. (21) The weight of a body is 50 N. What is its mass? (35) How does the gravitational force between two bodies changes if the distance between them is tripled? This is because the gravity of the moon is \(\frac{1}{6}th\) of that of the earth. CBSE Class 9 Science Physics Chapter 10 Gravitation Exercise Questions with Solutions to help you to â¦ Gravitation is the force of attraction between two objects in the universe. B: 2 hours Its, A: linear velocity is constant Q.3> What is the unit of Universal Gravitational Constant in SI unit? But in case you hit the ball with greater velocity, the ball will escape out of the gravitational field. A: 9.8 km/sec the Earth is the orbital centre of all celestial bodies was proposed by _____. JEE Main Previous Year Solved Questions on Gravitation Q1: If the distance between the earth and the sun were half its present value, the number of days in a year would have been (a) 64.5 The law of gravitation states that it depends on the masses of the objects and the distance between them. C: 5* 1024 kg B: 6.67 * 10-7 cgs unit Here we have covered Important Questions on Gravitation for Class 11 Physics subject. B: 10 km/sec Gravitation Class 9 Extra Questions Science Chapter 10 Extra Questions for Class 9 Science Chapter 10 Gravitation Gravitation Class 9 Extra Questions Very Short Answer Questions Question 1. A: Gravitational force (45) Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth. A: At Polar region Calculate (i) the velocity with which the ball was thrown up (ii) the maximum height attained by the ball and (iii) the distance of the ball below the highest point after 2 sec. Gravity - Gravity - Newtonâs law of gravity: Newton discovered the relationship between the motion of the Moon and the motion of a body falling freely on Earth. Ans: According to Newton's law of gravitation, the magnitude of the gravitational force between the two object is inversely proportional to the square of the distance between them, i.e. Hi, I am SOM, a State Added (WB) Lecturer in Physics at a College, Part-time blogger, and founder of gkarea.com, started blogging since 2015 and still learning. Who discovered that force is the cause of motion? B: It depends on the velocity of satellite Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? The universal gravitational constant is the force of attraction between two point masses of 1 Kg each kept at a distance of 1 metre. {\sec ^{ - 2}}\)), we have, \(mass(m) = \frac{{weight(W)}}{{gravity}}\), or, \(W = \frac{{50N}}{{9.8m. D: radius of orbit remain constant. (54) If the moon attracts the earth why does the earth not move towards the moon? What will happen to the gravitational force between two bodies if the masses of one body is doubled? a beam balance and a spring balance. If both the balance give the same measure of a given body on the surface of the earth, will they give the same measure on the suface of the moon? In order that a body of 5 kg weighs zero at â¦ (41) The weight of a body on the surface of earth is 392 N. What will be the weight of this body on a planet whose mass is double than that of the earth and radius is four times the radius of the earth? Please note that the mass of a body is constant everywhere in the universe, So, the mass of this man would be the same on earth as well as on the moon, that is, the mass will be 70 Kg on the earth as well as moon also. D: can not say, Q.23 If the earth stop rotating then the weight of an object on north pole will, A: Increase D: 3 hour. (22) A stone and a feather are thrown from a tower. C: remain same (\(g = 9.8m. According to Newton's law of gravitation, the apple and the earth experience equal and opposite forces due to gravitation. (3) Consider two bodies A and B. The 1 m C: 8.9 m-s2 In our day-to-day life, we talk about the term work, power and energy. The mass of moon is about 0.012 times that of the earth and its diameter is â¦ Since mass of a body remains constant so the beam balance will give the same measure on the surface of the earth and on the surface of the moon. A ... New Syllabus: 2015 Reflection at Spherical Mirror: Key Concept: (A) Reflection of light at spherical surface. B: mass and weight will be changed or, \({\left( v \right)^2} - 0 = 2 \times 9.8 \times 19.6\), or, \({v^2} = {\left( {19.6} \right)^2}\), (33) There are two kind of balance i.e. The acceleration produced by the gravitational force of earth does not depend on the mass of the object. A: 2 * 1034 kg Science Class 9 Important Questions are very helpful to score high marks in board exams. Very Short Answer Type Questions (VSAQ) (1) You know that the earth attracts you in the vertically downward direction. Why is it so called? C: 26000 km above the earth surface \(F \propto \frac{1}{{{r^2}}}\). Heliocentric model was proposed by _____. 2. Check below the important MCQs on CBSE Class 9 Science Gravitation: 1. NCERT exemplar solutions for Class 9 science gravitation is an essential study material for the students who wish to score well in Class 9 examination. (19) The earth's gravitational force causes an acceleration of \(5m. C: 2 hour 20 min (49) Why is the weight of an object on the moon \(\frac{1}{6}th\) its weight on the earth? D: None of the above. C: Nuclear force (47) What do you mean by acceleration due to gravity? B: Weight of a body will decreases (26) A boy drops a ball from the top of a tower of height 19.6 m. Calculate (i) the velocity of the ball just before it touch the ground. What would be the escape velocity of a planet whose mass and radius is double from earth? (17) State Kepler's third law of planetary motion. unit of G and its value, S.I. But it is the apple that falls towards the earth and not vice-versa. (63) A stone is thrown vertically upward with an initial velocity of 40 m/s. A: 1 kg (1) You know that the earth attracts you in the vertically downward direction. D: 9.8 N, A: mass of the object × gravitational acceleration C: Tropic of Cancer or Tropic of Capricorn Whenever an object falls towards the earth under the gravitational pull of the earth alone, the fall is called free-fall. (a) Gravitational Force (b) Electrostatic Force (c) Magnetic Force (d) None 2. We have Provided Gravitation Class 9 Science MCQs Questions with Answers to help students understand the concept very well. Weight of the body \(W = mg\). Example: Tie a stone to a thread and whirl it round as shown in the figure. A: 1 hour 30 min. Now, he puts the iron ball and the feather in a long jar from which air is completely evacuated. Why then, a heavy object does not fall faster than a light object? D: None of this. (64) Calculate the force of gravitation between the earth and the sun, given that the mass of the earth \(6 \times {10^4}Kg\) and mass of the sun is \(2 \times {10^{30}}Kg\) The average distance between the two is \(1.5 \times {10^{11}}m\). A: Weight of a body will increases The average distance between the two is \(1.5 \times {10^{11}}m\). What acceleration would the same force provide if both the masses of both objects are doubled of! Key topics top of a body question based on gravitation the masses of one object is doubled and tripled you can get 11. On all objects in the universe changes if the moon both objects are doubled order a. 37 ) an object and its weight of orbit remain constant C: 11.2 km/sec:... This straight line will be observed at same position with respect to earth he meets him at centre! 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