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Tsenkharla Middle Secondary School Midterm Examination: 2012 Trashiyangtse Index No: Supervising Examiner’s/Invigilator’s initial: Writing Time: 11/2hours. Total Marks: 80 Marks Paper 1 (IX Physics) READ THE FOLLOWING DIRECTIONS CAREFULLY: 1. Do not write for the first fifteen minutes. This time is to be spent reading the questions. After having read the questions, you will be given one and a half hours to answer all questions. 2. In this paper, there are two sections: A and B. Section A is compulsory. You are expected to attempt any four questions from Section B. 3. Read the directions to each question carefully and write all your answers in the space provided in the Question booklet itself. 4. Do not leave the examination hall before you have made sure that you have answered all the questions. This booklet contains 16 Pages ……………………………………………………………………………………………… For Chief Marker’s and Markers' Use Only Question Numbers Section A Q1.a Q1.b Q1.c Section B Q1.d Q1.e Q.2 Award Marker’s Initial MT/PHY IX/2012 Page 1 of 16 Q3 Q4 Q5 Q6 Q7 SECTION A (40 Marks) Compulsory: To be attempted by all candidates. Question 1. (a). Direction: Each question in this part is followed by four possible choices of answers. Choose the correct answer and write it in the space provided in the question booklet. (15) (i). An example for fundamental unit is: A. B. C. D. Newton Second Dyne Kgms-1 Answer: ……………………………………………… (ii). Number of vibrations made by vibrating object in one second is A. B. C. D. Amplitude Period Oscillation Frequency of oscillation Answer: ………………………………………………… (iii). The density of water is maximum at A. B. C. D. 40C 00C 1000C 100C Answer: …………………………………………………… (iv). The density of body is 5.7gcm-3. Its value in SI system will be A. B. C. D. 570Kgm-3 0.0057Kgm-3 5700Kgm-3 5.7gcm-3 Answer: …………………………………... MT/PHY IX/2012 Page 2 of 16 (v). A particle moves 50cm from A to B and return from B to C by 14cm as shown in figure below. The displacement of particle is A. B. C. D. A 50 cm 64cm 14cm 36cm B C Answer: ……………………………………… (vi). CGS unit for torque is A. B. C. D. Dyne cm Newton meter Kgms-2 gcms-2 Answer: ……………………………………… (vii). Inertia of a body depends on: A. B. C. D. Weight of the body Mass of the body Momentum of the body Impulse of the body Answer: ………………………………………… (viii). Force acting on a body is equal to A. B. C. D. Momentum Change of momentum Rate of change of momentum Rate of change of velocity Answer: …………………………………………… (ix). When an object undergoes acceleration A. Its speed always increases B. A Force always acts on it MT/PHY IX/2012 Page 3 of 16 C. Its velocity always increases D. It always falls towards earth Answer: …………………………………………… (x). A force of 20N is applied on a block, but the block does not move. The frictional force of a body would be: A. B. C. D. 20N More than 20N Less than 20N 10N Answer: …………………………………………… (xi). One day has: A. B. C. D. 60 Seconds 24 seconds 365 days 86400 Seconds Answer: …………………………………………… (xii). which of the following friction has a maximum magnitude? A. B. C. D. Limiting friction Kinetic friction Rolling friction Static friction Answer: ………………………………………… (xiii). The velocity of a body decreases from 80ms-1 to 20ms-1 in 10s. The retardation will be A. B. C. D. 20ms-2 6ms-2 60ms-2 10ms-2 Answer: ……………………………………. MT/PHY IX/2012 Page 4 of 16 (xiv). The relationship between linear momentum, mass and velocity is A. B. C. D. m = pv p = mv v= m/p pmv = 1 Answer: …………………………………………… (xv). Which of the following is scalar quantity? A. B. C. D. Displacement Velocity Force Speed Answer: ………………………………………………… (b). Direction: Fill in the blanks with a appropriate terms (5) (i). A simple pendulum which has time period of two second is called ……………………………………………… (ii). CGS unit of density is ………………………….. (iii). If the body is projected upward at highest point, its final velocity is ……………………………………………….. (iv). The force which opposes the relative motion between two surfaces in contact is ………………………………………….. (v). Detaching of an apple from tree when laden with sticks is due to …………………………………………………….. MT/PHY IX/2012 Page 5 of 16 (C). Match each item under column A with the most appropriate in Column B. You must rewrite the correct matching pairs in the space provided. (5) Column A (i). Principle of moments Column B (a). Screw Gauge (iii) Newton’s third (c). Tension force (ii). Contact force (b). Newton (iv). Force (d) . Spring balance (v). Pitch (e). Motion of rocket (f). Beam balance (g). Vernier Callipers Column A Column B ……………………………………………… ……………………………………………. ……………………………………………. …………………………………………… ……………………………………………… …………………………………………… ……………………………………………… ……………………………………………. …………………………………………….. …………………………………………… ……………………………………………… …………………………………………. (c). Direction: State whether the following statements is true or false. Correct the wrong statement (5) (i). The density of water at 40C is 1000gcm-3 …………………………………………………………………………………………………………………… (ii). A light year is a bigger unit of length …………………………………………………………………………………………………………………… MT/PHY IX/2012 Page 6 of 16 (iii). The rate of change of momentum is inversely proportional to force acting on a body. …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (iv). A torque is positive, if it tends to rotate the body in clockwise …………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… (v). The displacement of body is zero when it completes one round in a circular path …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (e). Direction: Answer the following questions: (i). What do you understand by the term density. State its SI unit. (2) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (ii). Out of two bodies of masses 3Kg and 9Kg, which one has more inertia? (1) …………………………………………………………………………………………………………………… (iii). Give one example where the body possesses translational motion as well as rotational motion (1) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (iv). State two methods of reducing friction (2) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………….. MT/PHY IX/2012 Page 7 of 16 (v). A pendulum completes 8 oscillation in 10s. What is it’s time period? (2) (vi). A boy moves 8m towards east and 6m towards south Calculate: (a). Distance covered by the boy (1) (1) (b). Displacement of the boy SECTION B (40 Marks) Attempt ANY FOUR questions Question: 02 (i). Define estimation (1) ……………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………… (ii). Differentiate between Fundamental units and Derived units (2) ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………. MT/PHY IX/2012 Page 8 of 16 (iii). Explain the following (a). When a moving train or bus suddenly stops, the passenger falls forward (1) …………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………… (b). A man standing on a boat, suddenly jumps towards the shore. The boats get a jerk in opposite direction (1) ………………………………………………………………………………………………………….………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (c). The bodies of aeroplanes, missiles and rockets are streamline. (1) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (d). The handle of a door is fixed at a larger distance from the hinge (1) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (iv). A Screw Gauge has 100 divisions in the thimble as shown in the following figure (1) Calculate: (a). Pitch of the Screw Gauge MT/PHY IX/2012 Page 9 of 16 (b). Least count of the Screw Gauge (1) (c). Diameter of the wire (1) Question 03 (i). Define acceleration. State SI unit of acceleration (2) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (ii). Differentiate between Translational motion and Rotational motion (2) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (iii). Give THREE disadvantages of friction (3) ……………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… MT/PHY IX/2012 Page 10 of 16 (iv). A motor car running at a velocity of 10ms-1 picks up a velocity of 50ms-1 in 5s. Calculate: (a). Acceleration of a motor car (b). Distance covered during acceleration by a motor car (v). State Newton’s Third Law of Motion. (1) (1) (1) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… Question 04 (2) (i). State Newton’s First Law of Motion …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (ii). State action and reaction forces in the following cases (a). Firing of bullet (1) ……………………………………………………………………………………………………………… …… …………………………………………………………………………………………………………………… (1) (b). Hammering of nail …………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… MT/PHY IX/2012 Page 11 of 16 (1) (c). A person walking on the ground …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (iii). Compare contact forces and non contact forces with one example each (3) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (iv). The mass of a piece of iron is 20Kg and its volume 20m3. Calculate density in (a). Kgm-3 (1) (1) (b). gcm-3 Question 05 (i). Define momentum. State its unit in CGS. (2) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… MT/PHY IX/2012 Page 12 of 16 (2) (ii). State Principal of moments …………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… (1/2 + 1/2 + 1/2 +1/2) (iv). Complete the followings (a). 1Litre = …………………………………. cm3 (b). 1 quintal = ……………………………… Kg (c). 1 newton = ……………………………… Dyne (d). 1 century = …………………………….. days (iv). A force of 50N acts on a body and the acceleration produced was 5ms-2. Calculate the mass of the body (2) (iii). Two equal and unlike parallel forces of magnitude 50N act on a rigid body, such that the moment of couple is 25Nm. Calculate the arm of couple (2) MT/PHY IX/2012 Page 13 of 16 Question 06 (1) (i). Define least count of an instrument …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (ii). Give two applications of couple action in daily life (2) ……………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………… (iii). Distinguish between distance and displacement of a body (2) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (iv). The least count of a vernier calliper is 0.01cm and has an error of +0.05cm. While measuring the radius of a sphere, the main scale reading is 2.80cm and 6th Vernier scale division coincides with main scale. Calculate the radius of the sphere (3) MT/PHY IX/2012 Page 14 of 16 (v). Friction is necessary evil. Give TWO reasons to support the statement (2) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… Question 07 (i). Define acceleration due to gravity. State its average value on the surface of the earth in SI unit (2) …………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………… (ii). What do you understand by the term inertia? State TWO kinds of inertia (3) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… (iii). State relationship between absolute units of force and gravitational units of force (2) …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………. MT/PHY IX/2012 Page 15 of 16 (iv). A body initially at rest starts moving with a constant acceleration of 2ms-2 and travel a distance of 50m Calculate (i). The final velocity of a body (ii). Time taken to covered the distance ………….BEST OF LUCK………… MT/PHY IX/2012 Page 16 of 16 (11/2) (11/2)