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GOLDCREST HIGH, LATUR 2nd TERM END EXAMINATION (2018-19) GRADE: 9 SUBJECT: SCIENCE PAPER-1 (PHYSICS) Time: 2 Hours Max. Marks: 80 Answer to this question must be written on the paper provided separately. You will not be allowed to write answers for the first 15 minutes. This time is to be spent on reading the question paper. The time given at the head of this paper is the time allotted for the writing the answer. The paper is divided into two sections. Attempt all questions from Section A and any four questions from Section B. The intended marks for questions or parts of questions are given in brackets [ ] SECTION-I (40 Marks) (Attempt all questions from this Section) Question-1 (a) (i) Define the least count of an instrument. (ii) What is the least count of a standard laboratory micrometer screw gauge? [2] (b) A spring balance is used to find the weight of a body X on the surface of the moon. The mass of the body X is 2 kg and its weight is recorded as 3.4 N. The weight of another body Y recorded by the same balance is found to be 7.65 N. Calculate the mass of the body Y. [2] (c) State two differences between mass and weight. [2] (d) Two pendulums P and Q have equal lengths but their bobs weigh 10 gf and 20 gf respectively. (i) Compare their time periods. (ii) Give a reason for your answer. (e) Why do we need to run a certain distance before getting into a moving bus? [2] [2] Question-2 (a) Copy the diagram below and clearly mark the directions of the forces that act on it and name the forces. [2] (b) If I travel from Mumbai to Pune (150 Km) in 2 hrs via the Express Highway and return to Mumbai via the old High way (180 km) in 3 hrs, calculate the average velocity during the entire journey. [2] (c) Define retardation and give an example of a body having this motion. TEE-2/PHY/2018-19/KSH This question paper consists of 5 printed pages and 1 blank page [2] Page 1 (d) What do you mean by anomalous expansion of water? At what temperature the density of water is maximum? State its value. [2] (e) Explain: (i) Dust particles are removed from a carpet by beating it. (ii) It is advantageous to run before taking a long jump. [2] Question-3 (a) Name two factors on which the time period of a simple pendulum depends. Write the relation for the time period in terms of the above named factors. [2] (b) A train moving with uniform speed covers a distance of 120 m in 2 s. Calculate: (i) the speed of the train (ii) the time it will take to cover 240 m. [2] (c) Give two examples to show that greater the mass, greater is the inertia of the body. [2] (d) Explain: (i) In winter ocean starts freezing from the surface and not from the bottom. [2] (ii) A glass bottle completely filled with water and tightly closed at room temperature, is likely to burst when kept in the freezer of a refrigerator. [2] Question-4 (a) A given mass of water is cooled from 10 C to 0 C. State the volume changes observed .Represent these changes on a temperature-volume graph. [2] (b) How are g and G related? A body falls freely under gravity from rest and reaches the ground in time t . Write an expression for the height fallen by the body. [2] (c) A force of 10 N acts on a body of mass 2 kg for 3 s, initially at rest. Calculate: (i) the velocity acquired by the body, and (ii) change in momentum of the body. [2] (d) State one factor on which the magnitude of a non-contact force depends. How does it depend on the factor stated by you? [2] (e) More the mass, more difficult it is to remove the body from rest . Explain by giving an example. [2] TEE-2/PHY/2018-19/KSH This question paper consists of 5 printed pages and 1 blank page Page 2 SECTION-II (40 MARKS) (Attempt any four questions from this section) Question-5 (a) A train is moving at a velocity of 25 ms-1. It is brought to rest by applying the brakes which produces a uniform retardation of 0.5 ms-2. Calculate (i) the velocity of the train after 10 s (ii) If the mass of the train is 20000 kg then calculate the force required to stop the train. [3] (b) (i) State the universal law of gravitation. (ii) Express it in a mathematical form. (Explain the symbols used.) (iii) State the value of universal gravitation constant in S.I. unit. [3] (c) Using the following velocity time graph of a body answer the following questions. [4] (i) During which time intervals is the body moving with variable velocity? (ii) What is the acceleration of the body during the interval 3 s to 5 s? (iii) What is the displacement of the body in the last four seconds of its motion? Question-6 (a) The diagram below shows a frozen pond in a cold region. (i) State the expected temperatures at A and B. (ii) Name the phenomenon responsible for these temperatures mentioned in part (i) [3] (b) A force acts for 10 s on a stationary body of mass 100 kg after which the force ceases to act. The body moves through a distance of 100 m in the next 5 s. Calculate (i) the velocity acquired by the body, (ii) the acceleration produced by the force, and (iii) the magnitude of the force. [4] (c) How is the acceleration due to gravity on the surface of the earth related to its mass and radius? Explain the meaning of the following statement 1 kgf = 9.8 N . TEE-2/PHY/2018-19/KSH This question paper consists of 5 printed pages and 1 blank page [3] Page 3 Question-7 (a) Define the terms: (i) Oscillation as related to a simple pendulum (ii) Amplitude (iii) Frequency (iv) Time period [4] (b)The following figure shows the velocity- time graph for the two cars A and B moving in the same direction. Which car has the greater acceleration? Give reasons to your answer. [3] (c) Two balls A and B of masses m and 2m are in motion with velocities 2v and v respectively. Compare: (i) their inertia (ii) their momentum and (iii) the force needed to stop them in the same time. [3] Question-8 (a) Explain: A hollow glass sphere which floats with its entire volume submerged in water at 4 C, sinks when water is heated above 4 C. [3] (b) The following shows the displacement time graph for four bodies A, B, C and D. In each case state what information do you get about the acceleration (zero, positive or negative) [4] (c) A body of mass 10 kg is taken from the earth to the moon. If the value of g on earth is 9.8 ms-2 and on moon is 1.6 ms-2 , find : (i) the weight of the body on earth (ii) the mass and weight of the body on moon. [3] TEE-2/PHY/2018-19/KSH This question paper consists of 5 printed pages and 1 blank page Page 4 Question-9 (a) A car acquires acquires a velocity of 72 km h-1 in 10 s starting from rest. Calculate : (i) the acceleration (ii) the average velocity, and (iii) the distance travelled in this time [4] (b) State how does the time period of a simple pendulum depend on (i) length of pendulum, (ii) mass of bob (iii) amplitude of oscillation. [3] (c) A train takes 3 h to travel from Agra to Delhi with a uniform speed of 65 km h-1 .Find the distance between the two cities. [3] Question-10 (a) Explain the following: (i) Water pipes in colder countries often burst in winter. (ii) The value of g remains same at all places on the earth surface Is this statement true? Give reason [4] (b) A train takes 2 h to reach station B from station A, and then 3 h to return from station B to station A. The distance between the two stations is 200 km. Find: (i) the average speed, (ii) the average velocity of the train. [3] (c) State the function of the following parts of a Screw gauge: (i) Ratchet (ii) Thimble (iii) Sleeve TEE-2/PHY/2018-19/KSH This question paper consists of 5 printed pages and 1 blank page [3] Page 5
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