IX SAI S T055 SCIENCE TEST

TIME: 1 Hr                 TEST – IX  (Set -2)                                                   M.M :30

                                  SECTION -A (1 MARK QUESTIONS)

                             Q. 1     What do you infer from the graph where velocity-time graph is parallel to the time axis?

                             Q. 2     Name the physical quantity which is measured by the rate of change of momentum?

                             Q. 3     Name the property of bodies that resists a change in their velocity.

                             Q. 4     Give S.I unit of Latent Heat?

                             Q. 5     Mention 2 factors that need to be varied to liquefy atmospheric gases?

SECTION-B (2 MARKS QUESTIONS)

                             Q. 6     A satellite is moving in a circular orbit around the earth with a constant speed. Is it being accelerated? Give reason for your answer?

                      Q. 7     A force of 5N gives a mass “m₁” an acceleration of 10  and mass  on acceleration of       20 . What acceleration would it give if both masses are tied together?

                             Q. 8     Two balls of the same size but of different material, rubber and iron, are kept on the floor of a moving train. Suddenly brake are applied to stop the truck.

(a) Will the ball start rolling? Why?                  (b) If yes in which direction?

(c) Will the speed of both be same?

                             Q. 9     What produces more severe burns, boiling water at 100°C or steam at 100°C?

                           Q. 10   The difference between the boiling temperatures of two substance is 25^oC. How much will it be in Kelvin?

SECTION-C (3 MARKS QUESTIONS)

                           Q. 11   Derive second equation of motion by graphical method?

                           Q. 12   A policeman wearing a bullet-proof jacket stands still on roller skates. The total mass is 90 kg. A bullet of mass 20 gm is fired at 450 m/s is stopped by the vest. What will be the velocity of policeman after that?

                           Q. 13   Two persons manage to push a car of mass 1500 kg at a constant speed along a level road. Another person then join them. Now the car gains an acceleration of 0.3 m/s². With what force does each person pushes the car? (Assume that each one pushes the car with equal force)

                           Q. 14   Define Evaporation? Write 4 factors affecting evaporation. Give 2 differences between evaporation & boiling?

                           Q. 15   A boy of mass 45 kg jumps with a horizontal velocity of 5 m/s on to a stationary cart of mass 5 kg having friction less wheels. What is his velocity as the cart start moving?