Angel International School - Manipay 1 st Term Examination November, 2015

Transcription

1 Grade 09 Angel International School - Manipay 1 st Term Examination November, 2015 Physics Duration: 3.00 Hours Index No:- Part 1 1) What is the SI unit of mass? a) kg b) mg c) g d) t 2) Which list contains only scalar quantities? a) Acceleration, Displacement, Mass b) Acceleration, Distance, Speed c) Displacement, Mass, Velocity d) Distance, Mass, Speed 3) How many µs are there in 1s? a) 1000 b) 1000,000 c) 10,000 d) 100,000 4) What is speed? a) Displacement / Time b) Distance / Time c) Distance X Time d) Distance 5) Describe the motion of the below displacement-time graph? a) Constant speed b) Accelerates c) Decelerates d) Stopped 6) The gradient of displacement-time graph is numerically equal to a) Acceleration b) Velocity c) Deceleration d) Distance 7) A solid ball is taken from the earth to the moon. On the moon will the ball have a very different a) Volume b) Density c) Mass d) Weight 8) Which quantity x is calculated using this equation? x= Mass X Acceleration a) Force b) Velocity c) Density d) Area 9) Which is the unit of gravitational field strength? a) N b) Kg c) N/kg d) S 2 10) A car is brought to rest in 5s from a speed of 10m/s. What is the average deceleration? a) 0.5 m/s 2 b) 2 m/s 2 c) 10 m/s 2 d) 5 m/s 2 11) Which statement about scalars and vectors is correct? a) A scalar has direction but no size b) A scalar has size but no direction c) A vector has direction but no size d) A vector has size but no direction 12) What is the weight of this lock? a) 0N b) 2N c) 3N d) 5N 1

2 13) A mass of 8kg accelerates at 5m/s 2. What force is acting on it? a) 80N b) 40N c) 8N d) 4N 14) What is this experiment? a) Ticker-tape b) Measuring the mass c) Measuring the volume d) Measuring the radius 15) Find the resultant of these two forces? 16) What is impulse? a) Force b) Time 8N 15 a) 15N b) 7N c) 23N d) 8N c) Force / Time d) Force X Time 17) What is the Newton s 3 rd law? a) Acceleration is directly proportional to force b) If there is no force,body will be at resistor moving with constant velocity c) Acceleration is inversely proportional to mass d) Action and reaction are equal and opposite 18) The graph illustrates the motion of an object. Which feature of the graph represents the distance travelled by the object whilst moving at a constant speed? a) area S c) area T b) area S + area T d) The gradient at point X 19) The diagram shows one method of measuring the diameter of a beaker. a) 4.5 cm b) 5 cm c) 5.5 cm d) 8 cm 2

3 20) What is the weight of a 2kg mass on Earth? a) 0.2N b) 2000N c) 0.02N d) 20N 21) A particle P is moving in a horizontal circle about O. P. moves at constant speed v. Which statement is true? a) A force of constant magnitude is acting in the same direction as v b) A force of constant magnitude is acting towards O. c) The force on P varies in size as it moves around the circle. d) There is no resultant force acting on P 22) What is momentum? a) mass b) velocity c) mass X velocity d) mass / velocity 23) A bullet of mass 10g fired by a gun moves at a velocity of 400m/s. Find its momentum? a) 4kgm/s c) 10 kg m/s b) 4000 kg m/s d) 0.04 kg m/s 24) How many mm are there in 1m? a) 100mm b) 10mm c) 1000mm d) 1mm 25) What is the unit of volume of liquids? a) mg b) m c) s d) litre 26) Calculate the volumes of a box 2m X 3m x4m? a) 6m 3 b) 12m 3 c) 8m 3 d) 24m 3 Answer the following questions 27 and 28 using below information. On the Earth, the gravitational field strength is 10N/kg. On the Moon gravitational field strength is 1.6N/kg. If an object has a weight of 50N on Earth. 27) What is the mass of the object? a) 50kg b) 0.5kg c) 5kg d) 500kg 28) What is the weight on the moon? a) 1.6N b) 5N c) 80N d) 8N 29) A car takes 1 hour to travel 100km along a main road and then ½ hour to travel 20km along side road. What is the average speed of the car for the whole journey? a) 60km/h b) 70km/h c) 80km/h d) 100km/h 3

4 30) An object of mass 100g is immersed in water as shown in the diagram. What is the volume of the object? a) 40cm 3 b) 50cm 3 c) 90cm 3 d) 60cm 3 1) Use the graph in figure 1 Part 2 Structure a) Find the total time taken for the journey? b) Find the maximum velocity? c) Write the equation of acceleration? d) Find the acceleration during the first part of the journey? 2) The distance between dots gives the distance moved by the trolley in one-fiftieth of seconds. 1/50 s a) What distance did the trolley travel in one-fiftieth of a second? b) What can you say about the speed of the car? c) What distance did it travel in 0.2s? 3) A ball is thrown upwards from the ground with a velocity of 30m/s. Take g as 10m/s 2, and assume air resistance is negligible. a) What is the velocity in the highest point? 4

5 b) How long does it take to reach its highest point I. Write the suitable equation? [1.5] II. Find the time? [2.5] 4) Figure shows a free fall parachutist falling vertically downward and shows how the speed of the parachutist varies with time. Arrows x and y show the two main forces acting on the sky-diver. I. State the name of force x and name of force y? X Y II. State the initial value of the acceleration of the parachutist. Give the unit of your answer? III. Explain why the acceleration decreases from A to B? IV. Explain why the parachutist falls at a constant speed? 5) A woman weights 500N when standing on the Earth s surface. a) What upward gravitational force does she exert on the Earth? b) A 16 kg mass travelling to the right at 5m/s collides with a 4 kg mass travelling to the left at 5m/s. i. What is the momentum of each mass? [3] ii. What is their total momentum? 6) Figure shows a car travelling at a uniform speed of 15m/s. At time t=0,the driver sees a child run out in front of the car. At time t=1s the driver starts to apply the brakes. The car then decelerates uniformly, taking a further 3s to stop. a) On fig, draw a graph to show how the speed of the car varies with t. [3] 5

6 b) Calculate the distance travelled in the first 1s of the motion? 7) Figure represents the motion of a car along a straight road. As the car approaches a small town, it slows down. The car travels at a constant speed from the start of the town to the end of the town. After passing through the town, the car speeds up. a) I. Determine the speed of the car reaches start of town. Speed = II. Determine the time taken by the car reaches start of town Time taken = III. Calculate the distance travelled by car reaches start o the town. Distance = b) The car accelerates after passing through the town. Calculate the acceleration.give the unit of your answer Acceleration = 8) An object 20m above the ground is thrown horizontally with a velocity of 2.5m/s. 6

7 a) How long does the object take to reach the ground? [3] b) What horizontal distance has it then covered? Essay 1) A. a) Sketch a velocity-time graph for a car moving with uniform acceleration from 5m/s to 25m/s in 15s? b) Use the sketch graph to find values for I. The acceleration? II. The total distance travelled during acceleration? B. An electric train moves from rest with a uniform acceleration of 1.5m/s 2 for the first 10s and continues accelerating at 0.5m/s 2 for a further 20s. It continues at constant speed for 90s and finally takes 30s to decelerate uniformly to rest. a) Draw a graph of speed against time for the journey? b) From your graph deduce the total distance travelled? c) What is the average speed of the train for the whole journey? (15 Marks) 2. A. State Newton s laws of motion ( Three Laws)? B. An object of mass 12kg is travelling at a velocity of 4m/s with no forces acting upon it. This velocity increases to 6m/s after a force has acted on the object for 3s. a) What is the momentum of the object before the force acts? b) What is the momentum of the object after the force has acted? c) How much momentum does the object gain? d) What is the size of the force acting? e) Calculate the acceleration of the object? (15 Marks) ***** 7