29/03/2020 Gravitational Fields(Senior Class Physics Study by Topics) 29/03/2020 0Comments by Gate Academy Welcome to your Gravitational Fields(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. No force due to Earth's gravity is acting on the astronauts inside the orbiting space shuttle. This statement is Always true while in orbit. Always false. Sometimes true while in orbit. 2. According to Keler, the path of a planet's orbit is in the shape of _____________ A circle, with the sun at the center An ellipse, with the earth at one of the foci A circle, with the earth at the center An ellipse, with the sun at one of the foci 3. The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. These twice-as-high apples, for the same mass, have Practically the same weight 1/4 the weight. 1/2 the weight. 4. 4 1 3 2 5. When the distance between two stars decreases by half, the force between them Increases to four times as much. Decreases by one-quarter. Increases to twice as much. Decreases by one-half. 6. For lunar tides to occur in the human body Most of the body would have to be in the liquid state. But there are lunar tides in the body, as evidenced by women's monthly menstrual cycles. parts of the body would have to be appreciably closer to the moon than other parts. The Earth's gravitation would have to be incredibly small. 7. According to Kepler, a planet will travel fastest in its orbit when _____________. It is coldest It is aligned with the other planets It is farthest from the sun It is closest to the sun 8. The amount of potential gravitational energy possessed by an object is not proportional to Speed Mass Gravity Height 9. According to Newton's Law of Universal Gravitation, which of the following do you NOT need to know in order to calculate the force of gravitational attraction between 2 objects? Radius of the larger object Mass of the smaller object Distance between the two objects Mass of the larger object 10. The main reason ocean tides exist is that the pull of the moon And sun are in conjunction at high tides and in opposition at low tides. And the sun on the oceans are in opposite directions Is greater on the Earth because the moon is closer to Earth. Is greater on oceans closer to the moon and less on oceans farther from the moon. 11. The amount of gravitational force that acts on the space shuttle while in orbit is The same as the shuttle's weight on the Earth's surface. Nearly zero. Almost as much as the shuttle's weight on the Earth's surface. 12. Gravity makes the Earth rotate around the sun. False True 13. Inside a freely falling runaway elevator, your Acceleration is zero. Apparent weight is zero. Gravitational interaction with the Earth is zero. All of these 14. What is the relationship between equipotential lines and lines of force. They are equidistant The are perpendicular to each other They are parallel to each other 15. Unit of G is ? N kg2/m2 N m/kg N m2 kg2 N m2 / kg2 16. The Earth's gravitational field extends Both inside and outside the Earth and throughout the entire universe. Neither of these Only above and beyond the Earth's surface and cancels inside the Earth 17. What is the acceleration of an object whose net force is 150N and has a mass of 25kg 10m/s/s 6m/s/s 6N 5N 18. What happens to the gravitational force between you and your neighbour if the distance between you doubles? Force becomes smaller by a factor of 4 Force becomes 2x as great Nothing Force becomes smaller by a factor of 2 19. Define Gravitational Potential Energy at point P. Work done in moving a test mass from infinity to a point P Work done in moving 1Kg from infinity to a point P Work done in moving a test mass from the floor to a point P Work done in moving 1Kg from the floor to a point P 20. Which of the following is a scalar quantity Velocity Acceleration Speed Displacement 21. What is the weight of an objectÂ on earths surface which weighs 60 N on moon's surface ? 2 kg 60 kg 360 N 10 N 22. A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above the Earth's surface. How much would she weigh there? 200 N 0 400 N 100 N 23. The force of gravity acting on an objects mass is Acceleration Work Weight Mass 24. What is the relationship between equipotential lines and lines of force. The are perpendicular to each other They are equidistant They are parallel to each other 25. Which one of the following is true ? Gravitational force is indirectly proportional to masses of two object None Gravitational force is directly proportional to masses of two bodies Gravitational force is directly proportional to square of distance between two bodies 1 out of 25 Time is Up! Time's up