This is what we call escape velocity. The average distance between the two is \(1.5 \times {10^{11}}m\). Q.10 What is the approximate mass of earth? It means, weight of a body depends upon the value of 'g'. Mass remain same but weight will be changed. Here you can get Class 9 Important Questions Science based on NCERT Text book for Class IX. 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. Q.8> If speed of rotation of earth increases then what would be the value of weight of a body? C: N-m/Kg2 (53) The earth and the moon are attracted to each other by gravitational force. By his dynamical and gravitational theories, he explained Keplerâs laws and established the modern quantitative science of gravitation. {\sec ^{ - 2}}\), We will first calculate the weight of the man on the moon. Question From class 11 Chapter HEAT TRANSFER In heat transfer, which method is based on gravitation ? Q.20 Does escape velocity of a body depend on its mass? On the other hand, spring balance measure the weight of a body. What acceleration would the same force provide if both the masses are tied together? Q.21 Let the escape velocity of earth is Ve. Q.15 How much time a polar satellite take to complete one revolution around earth? B: 9.8 m/s2 Practice JEE Main Important Topics Questions solved by our expert ⦠(14) Give the S.I. Explain with an example. (10) Newton's law of gravitation is also called inverse square law. B: 2 * 1032 kg Q.13 Does time period of artificial satellite depend on its mass? D: angular velocity constant. Check below the important MCQs on CBSE Class 9 Science Gravitation: 1. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Gravitation. {\sec ^{ - 2}}\)). The force which keeps the body to move in circular motion when accelerated is (a) Centripetal force (b) Magnetic force (c) Electrostatic force (d) Force of gravitation Answer. D: 9.8 N, A: mass of the object × gravitational acceleration Q.6> Where the value of gravitational acceleration is less due to the diurnal motion of earth? In the evacuated jar, both iron ball and the feather will fall together at the same time. 6.67x 10 11 c. 1 N d. 9.8m/s 2. Multiple Choice Questions on Gravitation - Understanding in Details Gravitation is a fundamental force acting between two bodies in space. 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. Q.14 What would be the height of an artificial satellite so that it can be observed at same position with respect to earth? Here we have covered Important Questions on Gravitation for Class 9 Science subject. B: Increase (1) You know that the earth attracts you in the vertically downward direction. () What would be its mass on the moon? (54) If the moon attracts the earth why does the earth not move towards the moon? C: gravitational force due to earth Is the mass of the body on the moon also one-sixth of its mass on the moon? GRAVITATION 1. Example: Tie a stone to a thread and whirl it round as shown in the figure. C: greater than rest object Take \(g = 10m. (51) Gravitational force acts on all objects in proportion to their masses. (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 \(1.5 \times {10^{11}}m\). (40) The acceleration of a freely falling body does not depend on the mass of the body. {\sec ^{ - 2}}\) in a 1 kg mass somewhere in space. In order that a body of 5 kg weighs zero at ⦠Q.1> What is the name of attractive force which act between any two bodies in our universe? D: 2 * 1028 kg. Its, A: linear velocity is constant C: 6.67 * 10-8 cgs unit B: Weight of a body will decreases A: It depends on the mass of the body Now lets test the following mcqs from gravitation. (20) What is the relation between mass and weight of a body? D: less than rest object. This is because the gravity of the moon is \(\frac{1}{6}th\) of that of the earth. These multiple choice questions are very important for upcoming exams for general science like SSC, CGL, CHSL, MTS, Railway Group-D, Group-C, IAS, UPSC Air force and Navy. What is the total distance covered by the stone? B: acceleration is constant A: 9.8 km/sec The cube of the mean distance of a planet from the sun is directly proportional to the square of time it takes to move around the sun. Define : gravitation, gravity and gravitational force. A: Velocity of moon But in case you hit the ball with greater velocity, the ball will escape out of the gravitational field. A: 9.8 m-s2 Free PDF Download of JEE Main Gravitation Important Questions of key topics. (ii) the distance between the objects is doubled and tripled? D: N/m2-Kg. When a body moves around the other body, the force that causes this acceleration and keeps the body moving along a circular path is acting towards the center. State the D: 6 * 1024 kg. Very Short Answer Type Questions (VSAQ) (1) You know that the earth attracts you in the vertically downward direction. Both the objects should reach the ground at same time, but it does not, give reason. 9.8N b. This force is proportional to the product of masses of the objects and inversely proportional to the square of the distance between them. C: total angular momentum remain constant (21) The weight of a body is 50 N. What is its mass? Now, he puts the iron ball and the feather in a long jar from which air is completely evacuated. D: can not say, Q.23 If the earth stop rotating then the weight of an object on north pole will, A: Increase 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. (34) The gravitational force between two objects is F. How will this force change when distance between them is reduced to half? (3) Reflection in Spherical Mirror. unit of G and its value, S.I. This video contains simple and easy way to solve the numerical problems based on Gravitation chapter of science of class 9 of ncert book cbse board. B: Zero We have Provided Gravitation Class 9 Science MCQs Questions with Answers to help students understand the concept very well. B: mass and weight will be changed (2) Weight of a change from place to place. (24) Calculate the force of gravitation between the earth and the sun, given that the mass of the earth \(6 \times {10^{24}}Kg\) and of the sun \(2 \times {10^{30}}Kg\). This straight line will be a tangent to the circular path. (ii) the total time it takes to return to the surface of the earth? B: angular velocity remain constant (52) What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? 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. (12) Suppose gravity of earth suddenly becomes zero, then in which direction will the moon begin to move if no other celestial body affects it? C: 8.9 m-s2 There are around 3-5 D: 63000 km above the earth surface. The relation between mass and weight of a body is. (49) Why is the weight of an object on the moon \(\frac{1}{6}th\) its weight on the earth? What would be the escape velocity of a planet whose mass and radius is double from earth? B: 9.8 kg This force is called centripetal force. Q.18 What is the weight of a body of mass 1 kg? Gravitation may be the attraction of objects by the earth. Physics Class 11 Important Questions are very helpful to score high marks in board exams. 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 Q.25 Suppose an object is thrown upward with an angle θ providing velocity equal to escape velocity (Ve). 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. A: Weight of a body will increases A body of mass 1kg is attracted by the earth with a force which is equal to a. (48) What are the difference between the mass of an object and its weight? C: 2 * 1030 kg The force of attraction between any two objects by virtue of their masses is called gravitational force, whereas the force of gravitation exerted by a huge heavenly body such as earth on a smaller object near its surface is called its gravity or the force of gravity. This is because the action and reaction forces are equal. But it is the apple that falls towards the earth and not vice-versa. Here is a solved numerical example on Gravitation: Question: An object of mass 50kg is raised to a hight of 10m above the ground. What will be observed when he inverts the jar upside down? D: Can not be answered. Search Terms: mcq on gravitation for class 9 10 11 pdf, gravitation mcq for neet pdf, gravitation mcqs with solution, gravitation mcq for competitive exam. (i) It is defined as acceleration due to gravity, (i) It is defined as universal gravitational constant, (iii) It change from place to place at pole of ‘g’ is more than at equator. B: It depends on the velocity of satellite \(W = mg\), Where \(W\) is the weight of that body and m is the mass of the body and V is the acceleration due to gravity. (ii) the maximum height it reaches and (iii) its position after 4 sec. Who discovered that force is the cause of motion? Velocity of a body that allow it to go outside the earth. The moon will move in the direction of the tangent to the moon's orbit. (3) Consider two bodies A and B. The earth attracts the moon with a force equal to the force with which the moon attracts the earth. As per the motion of object due to 'g' gravitational pull of earth, both the bodies are acted upon by the same force of earth but the stone will fall first and then the feather. () What is the acceleration due to gravity on the moon? 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