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ICSE Class IX Mid-term 2024 : Physics : test

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Dr.Vijayalakshmi Murali
Pearl Drop School, Pune

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PEARL DROP SCHOOL I UNIT TEST JULY- AUGUST 2023-24 SUBJECT: PHYSICS CLASS-IX Total Marks: 50 Date: 31st July 2023 Time: 1 hr. 20 min Time allowed: One hour twenty minutes Answers to this Paper must be written on the paper provided separately You will not be allowed to write in the first ten minutes This time is to be spent in reading the question paper Section A is compulsory. Attempt any three questions from Section B The intended marks for questions or parts of questions are given in brackets [] SECTION A (20 Marks) (Attempt all questions from this Section.) Question 1 Choose the correct answers to the questions from the given options (Do not copy the question, write the correct answers only) (i) 1 (Angstrom unit) is equal to a) 0.1 nm b) 10 cm c) 10-8 m d) 104 (ii) One lunar cycle is nearly equal to a) 28.5 days b) 29.5 days c) 30 days d) 30.5 days [10] (iii) If the length of a simple pendulum of mass 1 kg is increased from l to 4l then, the time period T will a) Remains same b) Becomes twice c) Becomes four times d) Becomes half (iv) Motion of a car in a crowded street is an example of a) Uniform speed b) Uniform velocity c) Variable acceleration d) Uniform acceleration (v) Slope of velocity v/s time graph gives a) Distance b) Displacement c) Acceleration d) None of these (vi) A spring balance works on the principle of: a) Gravitational force b) Magnetic force c) Restoring elastic force d) Frictional force (vii) 36km h-1 is equal to: a) 10 ms-1 b) 5 ms-1 c) 18 ms-1 d) 1.8 ms-1 (viii) On doubling the separation between two bodies, the magnitude of the non-contact force between them becomes: a) One-eighth b) One-half c) One -fourth d) Remains the same (ix) Freefall of a body near earth s surface is an example of a) Uniform acceleration b) Uniform Velocity c) Variable acceleration d) None of the above (x) A body is dropped from rest and falls freely under gravity. Then the distance covered by it in the first two seconds is about a) 9.8 m b) 10.4 m c) 14.6 m d) 19.6 m Question 2 i. ii. iii. Explain the meaning of derived unit with the help of one example. State the difference between the positive and negative zero error of a vernier callipers. How can you find the displacement from a velocity-time graph. [2] [2] [1] Question 3 i. ii. iii. Name two factors on which the time period of a simple pendulum does not depend. [2] Write an expression for the distance S covered in time t by a body which initially is at rest and starts moving with constant acceleration a. [1] What will be the magnitude and direction of the reaction force acting on a coin of 10 g lying on the surface of the floor? Take g = 9.8 m/s2. [2] SECTION B (30 Marks) (Attempt any three questions) Question 4 i. While measuring the length of a rod with a vernier callipers, figure below shows the position of its scales. What is the length of the rod? [3] ii. iii. Differentiate between scalar and vector quantities and give two examples of each. [3] How are the following derived units related to the fundamental units? (a) Newton (b) Watt (c) Joule (d) Pascal. [4] Question 5 i. ii. iii. Differentiate between displacement and distance. A bullet fired vertically upward falls at the same place after sometime. What is the displacement of the bullet? [4] Derive the following equations for a uniformly accelerated motion: v = u + at and S = ut + at2 [3] What is a frictional force? Draw a neat labelled diagram showing a frictional force acting on a body. [3] Question 6 i. ii. iii. Define the terms: (i) oscillation, (ii) amplitude (iii) frequency (iv) time period as related to a simple pendulum. [4] Draw the velocity-time graph for the displacement-time graph shown in the figure. [3] Give an example of the motion of a body moving with a constant speed, but with a variable velocity. Draw a diagram to represent such a motion. [3] Question 7 i. Given diagram shows a screw gauge. In one measurement, the final position of the scale is as shown in the diagram. The circular scale has 50 divisions. [4] a) What is the least count of the screw gauge? ii. iii. b) If 40th division of the circular scale coincides with the main scale line, what is the final reading? c) What do you mean by back-lash error of a screw gauge? A body is projected vertically upwards with a velocity of 98 m/s. Find (i) the maximum height attained by the body and (ii) time taken by body to reach the highest point. Take g = 9.8 m/s. [3] State the effects of a force applied on (a) a non-rigid, and (b) a rigid body. How does the effect of the force differ in the two cases? [3] Question 8 i. How does the velocity-time graph can be used to find acceleration of a body. The graph shows the velocity-time graph for two bodies X and Y moving in the same direction. Name the body which has greater acceleration. Why? [3] ii. iii. Explain the concept of restoring force. How does it act on spring? [3] a) Define light year and astronomical unit. [4] 25 b) The distance of a galaxy from the earth is 6 x 10 m. Assuming the speed of light to be 3 x 108 ms-1 find the time taken by light to travel this distance.

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