9th Physics Chapter 5 05/29/2024 – by freshmcqs 0 Welcome to your 9th Physics Chapter 5 Name Email WhatsApp Number 1. Earth's gravitational force of attraction vanishes at 6400 km infinity 42300 km 1000 km None 2. Value of g increases with the increase in mass of the body increase in altitude decrease in altitude non of the above None 3. The value of g at a height on Earth's radius above the surface of the Earth is: 2 g 1/2 g 1/3 g 1/4 g None 4. The value of g on moon's surface is 1.6 ms⁻². What will be the weight of a 100 kg body on the surface of the moon? 100 N 160 N 1000 N 1600 N None 5. The altitude of geostationary orbits in which communication satellites are launched above the surface of the Earth is: 850 km 1000 km 6400 km 42,300 km None 6. The orbital speed of a low orbit satellite is: zero 8 ms⁻¹ 800 ms⁻¹ 8000 ms⁻¹ None 7. .........predicted about artificial satellites about 300 years ago. Galileo Newton Faraday Einstein None 8. Distance of moon from Earth is? 38, 000 km 3, 80, 000 km 3, 000, 000 km 30, 000 km None 9. If the distance between two masses is half then the force of gravitation becomes: One fourth Four times Doubled Half None 10. What will be the value of G if mass of the earth becomes four times: No change Four times One fourth Doubled None 11. As we go up the value of G becomes: Unchanged Increases Decreases Doubled None 12. Unit of gravitational field strength is: N N Kg⁻¹ J N m None 13. In System International, the value of G is: 6.4 x 10⁶ Nm²kg⁻² 6.4 x 10⁻¹¹ Nm²kg⁻² 6.67 x 10¹¹ Nm²kg⁻² 6.67 x 10⁻¹¹ Nm²kg⁻² None 14. Radius of earth is: 6.4 x 10⁶ km 6.4 x 10⁶ m 6 x 10⁶ m 6 x 10⁶ km None 15. The SI unit of gravitation force is: Nm²Kg⁻² Newton ms⁻² both a and b None 16. The mass of Earth is approximately: 6.9 x 10²⁴ kg 6.0 x 10⁻²⁴ kg 6.0 x 10²⁴ kg 5500 x 10²⁴ kg None 17. When an object is at a height equal to radius of earth above the surface of the earth. What is the value of gₕ? 4g 2g g/2 g/4 None 18. Relative velocity of Geostationary satellite with respect to earth is: 7.9 kms⁻¹ 11.2 kms⁻¹ 9.8 ms⁻¹ Zero None 19. If a rocket is fired vertically with a speed of ..........., it will start revolving around the earth: 8 ms⁻¹ 8 kms⁻¹ 9.8 ms⁻¹ 11.2 kms⁻¹ None 20. Height of the Geostationary satellite above the surface of earth is: 1000 km 3600 km 36000 km 42300 km None 21. Gravitational force on the surface of earth is equal to: G g W All of the above None 22. Weight of the body of mass 10 kg on the surface of moon: 160 N 16 N 1.62 N None of the above None 23. The force which pulls the object towards the center of circle is known as _____force: Frictional Coulomb Centripetal Gravitational None 24. What is not true about g? g is different at different places g is greater at poles g is less at poles g decrease as go higher None 25. If the weight of an object on the surface of earth is W. Its weight on the surface of moon will be: 6W W/6 W/4 W/8 None 26. On mountains our weight will be _____as compared to weight on the surface of earth. Equal Greater Less None of the above None 27. If mass of both the bodies is 1Kg and distance between their centers is 1m then the gravitational force will be equal to: G g V None of the above None 28. An artificial satellite keeps on revolving around the earth in different orbits with uniform speed due to the? Gravitational force Frictional force Coulomb Force Electromagnetic force None Please fill in the comment box below.