Gravitation (गुरुत्वाकर्षण) Ch(9) Practice Quiz in Hindi Part – 1 || Class 9 Science Practice Quizzes in English Posted on February 28, 2025February 28, 2025 by Anshul Gupta0% 0 votes, 0 avg 2 Gravitation (गुरुत्वाकर्षण) Ch(9)Practice Quiz in Hindi Part – 1 || Class 9 Science Practice Quizzes in English 1 / 201. What is the unit of pressure? A. Joule (J) B. Watt (W) C. Newton (N) D. Pascal (Pa) Explanation: The SI unit of pressure is the Pascal (Pa), named after scientist Blaise Pascal.2 / 202. What happens to the force of gravity between two objects if the mass of one object is doubled? A. The force is doubled B. The force is quadrupled C. The force remains the same D. The force is halved Explanation: The force of gravity is directly proportional to the product of the masses of the objects.3 / 203. What determines whether an object will float or sink in a fluid? A. Its mass B. Its volume C. Its weight D. Its density Explanation: Objects with a density less than the fluid will float, while objects with a density greater than the fluid will sink.4 / 204. What is the force acting on an object perpendicular to the surface called? A. Thrust B. Pressure C. Weight D. Buoyant force Explanation: Thrust is the force acting perpendicular to the surface.5 / 205. What is the value of the universal gravitational constant (G)? A. 6.673 x 10^-11 N m^2 kg^-2 B. 9.8 m/s^2 C. 1.62 m/s^2 D. 9.8 N m^2 kg^-2 Explanation: The accepted value of G is 6.673 x 10^-11 N m^2 kg^-2.6 / 206. What is the name of the force that keeps the Moon in orbit around the Earth? A. Frictional force B. Magnetic force C. Centripetal force D. Gravitational force Explanation: The centripetal force is the force that acts towards the center of a circular path, keeping an object moving in that path. In the case of the Moon, the Earth’s gravitational pull provides the centripetal force.7 / 207. What happens to the force of gravity between two objects if the distance between them is doubled? A. The force is doubled B. The force is halved C. The force is reduced to one-fourth D. The force remains the same Explanation: The force of gravity is inversely proportional to the square of the distance between the objects.8 / 208. What is the relationship between the acceleration due to gravity (g) and the radius (R) of the Earth? A. g is inversely proportional to R^2 B. g is directly proportional to R^2 C. g is inversely proportional to R D. g is directly proportional to R Explanation: The acceleration due to gravity is inversely proportional to the square of the distance from the center of the Earth.9 / 209. What is the relationship between the force of gravity (F) and the distance (d) between two objects? A. F is directly proportional to d^2 B. F is directly proportional to d C. F is inversely proportional to d D. F is inversely proportional to d^2 Explanation: The force of gravity is inversely proportional to the square of the distance between the objects.10 / 2010. What is the direction of the gravitational force between two objects? A. Perpendicular to the line joining their centers B. Opposite to the line joining their centers C. Along the line joining their centers D. Parallel to the line joining their centers Explanation: The gravitational force acts along the line connecting the centers of the two objects.11 / 2011. What is the principle that explains why a ship made of steel can float on water? A. Archimedes' principle B. Boyle's law C. Newton's law of gravitation D. Pascal's law Explanation: Archimedes’ principle states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. 12 / 2012. What is the weight of an object with a mass of 10 kg on Earth? A. 10 kg B. 98 N C. 98 kg D. 10 N Explanation: Weight is calculated by multiplying mass by acceleration due to gravity (W = m x g). Therefore, the weight of a 10 kg object on Earth is 10 kg x 9.8 m/s^2 = 98 N.13 / 2013. What is the SI unit of weight? A. Pascal (Pa) B. Joule (J) C. Kilogram (kg) D. Newton (N) Explanation: Weight is a force, and the SI unit of force is the Newton (N).14 / 2014. What is the upward force exerted by a fluid on an immersed object called? A. Frictional force B. Centripetal force C. Buoyant force D. Gravitational force Explanation: The upward force exerted by a fluid on an immersed object is known as the buoyant force or upthrust.15 / 2015. What is the buoyant force equal to according to Archimedes’ principle? A. Density of the fluid B. Weight of the fluid displaced by the object C. Weight of the object D. Pressure exerted by the fluid Explanation: Archimedes’ principle states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. 16 / 2016. What is the pressure exerted by an object on a surface? A. Weight of the object B. Force per unit area C. Thrust acting on the object D. Mass per unit volume Explanation: Pressure is defined as the force applied perpendicular to a surface divided by the area over which the force is distributed.17 / 2017. What is the force that causes objects to fall towards the Earth? A. Electric force B. Gravitational force C. Centripetal force D. Magnetic force Explanation: The Earth attracts objects towards it due to the force of gravity.18 / 2018. What is the weight of an object on the Moon compared to its weight on Earth? A. Twice as much B. The same C. One-sixth as much D. Half as much Explanation: The weight of an object on the Moon is one-sixth its weight on Earth due to the Moon’s lower gravity.19 / 2019. What is the acceleration due to gravity (g) on the surface of the Earth? A. 1.62 m/s^2 B. 9.8 m/s^2 C. 6.673 x 10^-11 N m^2 kg^-2 D. Varies depending on the object's mass Explanation: The acceleration due to gravity on the surface of the Earth is approximately 9.8 m/s^2.20 / 2020. What is the weight of a 10 kg object on the Moon? A. 60 N B. 10 N C. 98 N D. 16.33 N Explanation: The weight of an object on the Moon is one-sixth its weight on Earth. Therefore, a 10 kg object on the Moon would weigh 98 N / 6 = 16.33 N.Please insert your information to see your ranking अपनी Ranking जानने के लिए कृपया अपनी जानकारी भरे NamePhone Number Your score isThe average score is 50% 0% Restart quiz Category: Class 9 Science Quizzes in English
