PHYSICS TEST -GRADE XII

PHYSICS TEST 1- GRADE -XII The distance travelled by light in free space in one year is Watt Pascal Farad Light year Pick one of the following do not have the dimensions of force,. Potential gradient Energy gradient Weight Rate of change of momentum One of the following can be expressed in Kilogram per square second. Viscosity Spring constant Relative density None of the above The dimensional formula for force per unit linear density of wire is same as that of Velocity Acceleration Latent heat Specific heat _____is the SI unit of both work and energy. Ampere Joule Kelvin Hertz The fundamental unit of quantity of matter is Kg Gm mol Tonne 7. Ampere hour is the unit of ___ Electrical energy Electric potential Strength of current Quantity of electricity The physical quantity which has the dimensional formula same as that of is Force Power Acceleration momentum Of the following pairs, the one that has both the quantities as vectors is__ Energy and force Force and work Energy and displacement Force and displacement The numerical ration of average velocity to average speed Always less than 1 Always greater than 1 Equal to or less than 1 The slope of the displacement –time curve at any point gives Velocity Acceleration Initial velocity None of the above A person sitting in a train is facing the direction of motion. He tosses a ball and the ball falls behind him. Then the train is moving Forward with uniform speed Backward with uniform speed Forward with acceleration Backward with acceleration The law that gives the definition of force is Newton’s first law of motion Newton’s second law of motion Newton’s third law of motion Newton’s law of gravitation A gun recoils on firing bullet. This is in accordance with Newton’s first law of motion Newton’s second law of motion Newton’s third law of motion Newton’s law of gravitation Newton’s third law of motion can be obtained form Newton’s first law Newton’s second law Law of conservation of momentum Law of conservation of energy A person standing in a stationary boat throws a heavy bag northwards. Then the Boat moves southward Boat moves eastward Boat moves westward Boat remains stationary A rocket works on the principle of . Conservation of mass Conservation of energy Conservation of angular momentum Conservation of linear momentum The fast moving vehicles are streamlined to reduce Dry friction Limiting friction Static friction Wet friction It is difficult to move a cycle with brakes on because Rolling friction is more than sliding friction Sliding friction is more than rolling friction Rolling friction opposes motion Sliding friction opposes motion The maximum height attained by a projectile does not depend on. Acceleration of the projectile Mass of the projectile Angle of projection Initial velocity When a body moves in a circular path, the force necessary to keep the body along the circular path is __. Centripetal force Centrifugal force Centrifugal reaction All the above A particle moving in a circular path has ___. Constant velocity Constant acceleration Constant displacement Constant kinetic energy Work done by the centripetal force is ___ Positive Negative Zero Equal to one The angular momentum of a particle is Perpendicular to its linear momentum Inclined to its linear momentum Parallel to its linear momentum A scalar quantity The value of acceleration due to gravity on a planet depends on ___. Mass of the planet Radius of the planet Temperature of the planet Both mass and radius of the planet SOLUTIONS 1. Light year 2. Rate of change of momentum 3. Spring constant 4. Latent heat 5. Joule 6. mol 7. Quantity of electricity 8. Acceleration 9. Force and displacement 10. Equal to less than 1 11. Velocity 12. forward with acceleration 13. Newton’s first law of motion 14. Newton’s third law of motion 15. Law of conservation of momentum 16. Boat moves southward 17. Conservation of linear momentum 18. Wet friction 19. Sliding friction is more than the rolling friction 20. Mass of the projectile 21. Centripetal force 22. Constant kinetic energy 23. Zero 24. Perpendicular to its linear momentum 25. Both mass and radius of the planet