# gravitation class 11 questions

(b) Acceleration due to gravity increases with increasing depth (assume the earth to be a sphere of uniform density). When comet is near the sun, its speed is higher. Change in kinetic energy = 1.25 x 107 – 0 = 1.25 x 107 m J Mass of the satellite = 200 kg; mass of the earth = 6.0 x  1024 kg; radius of the earth = 6.4 x  106 m; G = 6.67 x  10-11 N m2 kg-2. If that happens, for our earth. Questions : 1. 1. Question 8. 11. Question 8. Question Bank for NEET Physics Gravitation Self Evaluation Test - Gravitation. 18. NCERT Solutions Class 11 Physics Physics Sample Papers. Since the inward force due to gravity on a body at the equator of the star is about 2.2 million times more than the outward centrifugal force, the body will remain stuck to the surface of the star. You also get idea about the type of questions and method to answer in your Class 11th examination. Let's explore more about Gravitation and find answers to these question. For a rigid body, we know that if various forces act at various points in it, the resultant motion is as if a net force acts on the c.m. Question 8. (a) Inertial mass is a measure of difficulty of accelerating a body by an external force whereas the gravitational mass is relevant in determining the gravitational force on it by an external mass. For the motion of another planet like mercury as observed from earth, this would. (b) Angular speed also varies slightly. A satellite is in an elliptic orbit around the earth with aphelion of 6R and perihelion of 2 R where R= 6400 km is the radius of the earth. Question 8. NCERT Exemplar Class 11 Physics is very important resource for students preparing for XI Board Examination. Io, one of the satellites of Jupiter, has an orbital period of 1.769 days and the radius of the orbit is 4.22 x 108 m. Show that the mass of Jupiter is about one-thousandth that of the Sun. (a) planets will not have elliptic orbits. Initial potential between two stars, r =  109 km =  1012 m. What would be its orbital size as compared to that of the Earth? Physics Important Questions Class 11 are given below. Graphical Questions… Answer: (a) The linear speed of the comet is variable in accordance with Kepler7s second law. If the space station orbiting around the Earth has a large size, can he hope to detect gravity? A day should be taken from noon to noon. In our solar system, the inter-planetary region has chunks of matter (much smaller in size compared to planets) called asteroids. A: 6.67 * 10-6 cgs unit. Question 8.7. Explain with reason, which ones amongst them can be possible trajectories traced by a projectile (neglect air friction). Answer: (c) 1/800 rad /s A body is projected out with thrice this speed. What should be done if this satellite has to be transferred to a circular orbit of radius 6R . 14. NCERT Exemplar Class 11 Physics Chapter 7 Gravitation Multiple Choice Questions Single Correct Answer Type Q1. A rocket is fired vertically with a speed of 5 km s-1 from the earth’s surface. 16. (c) mass of the body What is the direction of areal velocity of the earth around the sun? Practice Now. What is the gain in its potential energy? Here we have covered Important Questions on Gravitation for Class 11 Physics subject.. Physics Important Questions Class 11 are given below.. 13. Class 9 Physics Notes - Chapter 5 - Gravitation - Numerical Problems. If the mass of sun were ten times smaller and gravitational constant G were ten times larger in magnitudes-. A rocket is fired from the earth towards the sun. Will an object placed on its equator remain stuck to its surface due to gravity? (a) will be directed towards the centre but not the same everywhere. Answer:  Initial kinetic energy of rocket = 1/2 mv2 = 1/2 x m x (5000)2 = 1.25 x 107 mJ (b) Yes. (i) a, (ii) b, (iii) c, (iv) 0. The notes contain solution of all the numerical given in the chapter. M be the mass of the Sun and M’ be the mass of Mars. MCQ Questions for Class 9 Science: Ch 10 Gravitation. The mass of an object is the measure of its (a) pressure. Mass of the Earth = 6.0 x 1024 kg, radius = 6400 km. To get fastest exam alerts and government job alerts in India, join our Telegram channel. The escape speed of a projectile on the Earth’s surface is 11.2 km s-1. If the interior contained matter […] Contents. (b) will move in an irregular way because of their small masses and will drift away into outer space. (c) The escape speed does not depend on the direction of projection of a body. (a) all three of Kepler’s laws would still be valid. Download CBSE Class 11 Physics Gravitation MCQs in pdf, Physics chapter wise Multiple Choice Questions free, Question: In planetary motiona) the total angular momentum remains constantb) the linear speed remains constantc) neither the angular momentum nor angular speed remains constantd) the angular speed remains constantAnswer: the total angular momentum remains constant 8.2). Question 1. Question 8. Question 8. Get important questions of Gravitation Class 11 with their answers. Give one example each of central force and non-central force. Gravitation Class 11 MCQs Questions with Answers. Why? (b) A geostationary satellite goes around the earth in east-west direction. An object of mass m is raised from the surface of the earth to a height equal to the radius of the earth, that is, taken from a distance R to 2R from the centre of the earth. Final potential energy of two stars = -GMm/2R Ignore the presence of the Sun and other planets. From equation (i), the acceleration due to the gravity of the star Two stars each of one solar mass (=2 x  1030 kg) are approaching each other for a head on collision.When they are at a distance  109 km, their speeds are negligible. Total K.E. Here we have given NCERT Exemplar Class 11 Physics Chapter 7 Gravitation. The centre of mass of an extended body on the surface of the earth and its centre of gravity. The variation in g can also be detected. Soln: g at the surface of earth = 9.8m/sec 2 (i) h = $\frac{{\rm{R}}}{2}$ g' = ? Gravitation Class 9 Extra Questions Very Short Answer Type. (b) weight. Answer:  Let gh be the acceleration due to gravity at a height equal to half the radius of the Earth (h = R/2) and g its value on Earth’s surface. Will an object placed at the mid point of the line joining their centres be in stable equilibrium or unstable equilibrium? Select the correct option to test your skills Gravitation. Answer: Here G = 6.67 x 10-11 Nm2 kg-2; M = 100 kg; R = 0.1 m, distance between the two spheres, d = 1.0 m Answer: Question 8.4. In order that a body of 5 kg weighs zero at the equator, the angular speed of the earth is (a) 1/80 rad /s (b) 1/400 rad /s (c) 1/800 rad /s (d) 1/1600 rad /s. Draw areal velocity versus time graph for mars. Q.2> What is the value of Universal Gravitational Constant (G) in C.G.S unit? 24. For that all that one needs to do is understand the premises of the universal law of gravitation and how it can be applied. Certain stellar objects called pulsars belong to this category). The following section consists of Physics Multiple Choice questions on Gravitation For competitions and exams. Question 8.3. (c) Due to more blood supply to face, the astronaut may get headache. (c) Comet has constant angular momentum. (a) Acceleration due to gravity increases/decreases with increasing altitude. (a) Calculate height of such a satellite. Multiple Choice Questions (MCQ I) Answer:  Let R be the radius of orbit of Mars and R’ be the radius of the Mars. A star like the sun has several bodies moving around it at different distances. (b) Find out the minimum number of satellites that are needed to cover entire earth so that at least one satellites is visible from any point on the equator. The earth is an approximate sphere. (a) Pascal Question 10. 20. Define the following terms. (b) none of the three laws of Kepler will be valid. Six point masses of mass m each are at the vertices of a regular hexagon of side l. Calculate the force on any of the masses. We also have the frames of reference in space. Gravitation is important from the perspective of scoring high in IIT JEE, AIEEE and other engineering examination as the questions based on them are direct and do not have much twist and turns. Gravitational forces are independent of medium. Gravitation is one of the fundamental forces of attraction that exists between the objects. Answer: Here, r = 50000 ly = 50000 x 9.46 x 1015 m = 4.73 x 1020 m We know that. Assertion and Reason. (f) Total energy throughout the orbit remains constant. How much energy must be expended on the spaceship to rocket it out of the solar system? 3. causing rotation around an axis through the c.m. Get in touch with Leverage Edu experts and they will assist you in establishing a career abroad after class 12th as scores of opportunities awaits you there. (a) will not move around the sun since they have very small masses compared to sun. How much energy must be expended to rocket the satellite out of the earth’s gravitational influence? (d) Kinetic energy does not remain constant. At distance r from centre of earth, kinetic energy becomes zero QUESTIONS FROM TEXTBOOK. Before starting with Gravitation Class 11, it is crucial to understand that gravity and gravitation are not similar. A star 2.5 times the mass of the sun and collapsed to a size of 12 km rotates with a speed of 1.2 rev. 1. View 11th Physics important questions for exam point of view. M = 2.5 x 1011 solar mass = 2.5 x 1011 x (2 x 1030) kg = 5.0 x 1041kg The gravitational force between a hollow spherical shell (of radius R and uniform density) and a point mass is F. Show the nature of F vs r graph where r is the distance of the point from the centre of the hollow spherical shell of uniform density. (a) Acceleration due to gravity decreases with increasing altitude. What is the angle between the equatorial plane and the orbital plane of. NCERT Exemplar Class 11 Physics Chapter 7 Gravitation are part of NCERT Exemplar Class 11 Physics. (Use the known value of G). Consider that all of them are moving in circular orbits. How long will a star at a distance of 50,000 ly from the galactic centre take to complete one revolution? November 21, 2019 Physics Gurukul Leave a Comment on Class 11th Physics Ch-8 Gravitation Questions with Solutions Class 11th Physics Ch-8 Gravitation Questions with Solutions Question 1: The mass of two bodies are doubled and the distance is … Question 9. (a) the acceleration due to gravity on earth will be different for different objects. (b) the acceleration due to gravity on earth will not change. (c) projectile motion of a stone thrown by hand on the surface of the earth will be approximately parabolic. (b) The escape speed does not depend on the location from where a body is projected. 2. 21. mass of the Earth = 6 x 10^24 Kg G = 6.67 x 10^(-11) N-m^2/kg^2 and distance between the Sun and the Earth=1.49 x 10^11 m) (d) The formula – GMm (1/r2-1/r1) is more/less accurate than the formula mg (r2 – r1) for the difference of potential energy between two points r2 and r1 distance away from the centre of the Earth. (b) we will become hotter after billions of years. In other words, distant stars would rise 4 minutes early every successive day. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Choose the correct alternative: Since the distance of moon from the ocean water is very small as compared to the distance of sun from the ocean water on earth. NCERT Solutions for Class 11 Physics Chapter 8 Gravitation are part of Class 11 Physics NCERT Solutions. 6. (d) there will be no gravitational force inside a spherical shell of uniform density. (b) An astronaut inside a small spaceship orbiting around the Earth cannot detect gravity. Question 8. 19. Is it possibe for a body to have inertia but no weight? How far is the Saturn from the Sun if the Earth is 1.50 x 108 km away from the Sun? 11. Question 8. (mass of the sun = 2 x 1030 kg). (d) is close to each other for objects, say of sizes less than 100 m. (e) both can change if the object is taken deep inside the earth. The value of G is independent of the nature and size of the bodies well as the nature of the medium between them. (c) A geostationary satellite goes around the earth in west-east direction. A body cannot be shielded from the gravitational influence of nearby matter. = 6400 + 36000 = 42400 km = 4.24 x 107 m. Question 8. Answer: Mass of Sun, M = 2 x 1030 kg; Mass of Earth, m = 6 x 1024 kg Distance between Sim and Earth, r = 1.5 x 1011 m Question 8. The gravitational potential difference between the surface of a planet and 10 m above is 5 J/kg. A typical gravitation class 11 syllabus will include certain mathematical problems related to the force of gravity and there are some basic concepts that one needs to be aware. These are (i) the gravitational force (ii) the electromagnetic force Question 8. Does this explain variation of length of the day during the year? NCERT solutions Class 11 Physics Chapter 8 Gravitation is a vital resource you must refer to score good marks in the Class 11 examination. (c) of viscous forces causing the speed of satellite and hence height to gradually decrease. (d) the torque causes the earth to move around the sun. (d) for n negative, an object lighter than water will sink in water. (b) will not be strictly elliptical because the total gravitational force on it is not central. If the gravitational field is supposed to be uniform, the work done in moving a 2 kg mass from the surface of the planet to a height of 8 m is So, the astronaut will not get swollen feet. If the mass is removed further away such that OP becomes 2h, by what factor the force of gravitation will decrease, if h = r ? An astronaut inside a small spaceship orbiting around the earth cannot detect gravity. Answer: Question 8. How far from the earth does the rocket go before returning to the earth? Does the escape speed of a body from the Earth depend on (a) the mass of the body, (b) the location from where it is projected, (c) the direction of projection, (d) the height of the location from where the body is launched? Topics and Subtopics in NCERT Solutions for Class 11 Physics Chapter 8 Gravitation: NCERT Solutions Class 11 PhysicsPhysics Sample Papers. (d) will move in orbits like planets and obey Kepler’s laws. If the law of gravitation, instead of being inverse-square law, becomes an inverse-cube law-. Assume the stars to remain undistorted until they collide. Answer: At all points inside a hollow spherical shell, potential is same. How will you ‘weigh the sun’, that is, estimate its mass? where v is the speed of stars with which they collide. 25. (d) not be true because mercury is influenced by forces other than gravitational forces. 6.67x 1011. c. … (c) not be true because the major gravitational force on mercury is due to sun. Does the comet have a constant (a) linear speed (b) angular speed (c) angular momentum (d) kinetic energy (e) potential energy (f) total energy throughout its orbit? G = 6.67 x 10^(-11) N-m^2/kg^2. (centre of mass) causing translation and a net torque at the c.m. Here M is the mass and R is the radius of the star. Sidereal day is the time interval between two successive transit of a distant star through the zenith point (meridian). For a satellite of Jupiter, orbital period, T1 = 1.769 days = 1.769 x 24 x 60 x 60 s Radius of the orbit of satellite, r1 = 4.22 x 108 m, Question 8.5. 2 ] What is the gravitational force between the Sun and the Earth? Question 8. 8.3). Since gain in K.E. What is the gravitational field and potential at the mid point of the line joining the centres of the spheres ? What is the centripetal force that makes moon revolve around earth? The radius of the earth is 6400 km and g = 10 m/s². 1 CBSE Class 11 Physics – Important Objective and Practice MCQs. A rocket is fired ‘vertically’ from the surface of Mars with a speed of 2 km s-1. 2. (Take the potential energy at infinity to be zero). Here we have given NCERT Solutions for Class 11 Physics Chapter 8 Gravitation. Let at the point P, the gravitational force on the rocket due to Earth. Answer:  (a) If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic energy. Answer: (a) No. (b) will have the same value everywhere but not directed towards the centre. 10. In the following two exercises, choose the correct answer from among the given ones: The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig.) Suppose there existed a planet that went around the Sun twice as fast as the Earth. (a) walking on ground would became more difficult. It follows from here that if we remove the upper hemispherical shell, the net gravitational force acting on a particle at P will be downwards. (d) A polar satellite goes around the earth in east-west direction. They. Extra Questions for Class 9 Science Chapter 10 Gravitation with Answers Solutions. b. Particles of masses 2M, m and M are respectively at points A, B and C with AB = (½) (BC). (b) not be true because the force between earth and mercury is not inverse square law. 12. This means that the length of the solar day is not constant through the year. If the sun and the planets carried huge amounts of opposite charges. A comet orbits the Sun in a highly elliptical orbit. All topics preceding Ch 8 physics class 11 are based on the concepts you’re going to learn from this chapter. 17. Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way down to the centre of the earth if it weighed 250 N on the surface? Take the diameter of the Milky way to be 105 ly. By drawing appropriate diagram showing earth’s spin and orbital motion, show that mean solar day is four minutes longer than the sidereal day. MCQ Questions for Class 9 Science: Ch 10 Gravitation. Time period, T = 365.25 x 24 x 60 x 60 s A ball is projected vertically upwards with an initial velocity of u goes to a maximum height h before … (c) the rigid body result is not applicable since the earth is not even approximately a rigid body. Question 8. There have been suggestions that the value of the gravitational constant G becomes smaller when considered over very large time period (in billions of years) in the future. Question 8. a. Mass of Mars = 6.4 x 1023 kg; radius of Mars = 3395 km; G = 6.67 x 10-11 N m2 kg-2 (c) That the acceleration due to gravity on earth is the same for all bodies is due to the equality of gravitational mass and inertial mass. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means? Out of aphelion and perihelion, where is the speed of the earth more and why ? However, the tidal effect of the Moon’s pull is greater than the tidal effect of Sun. Mass of the sun = 2 x 1030 kg, mass of the earth = 6 x 1024 kg. (b) circular orbits of planets is not possible. But it is the apple that falls towards the earth and not vice-versa. 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