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# ICSE Class X Prelims 2023 : Physics (Kapol Vidyanidhi International School (KVIS), Mumbai)

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 Raj Pandya Thakur Public School (TPS), Mumbai
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KAPOL VIDYANIDHI INTERNATIONAL SCHOOL(ICSE) TEMPLE OF KNOWLEDGE Date:05/12/22 STD X MARKS:80 PRELIM 1 EXAMINATION PHYSICS DUR: 2h Answers to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. Attempt all questions from each section A. Any 4 questions from section B. SECTION A (All questions are compulsory) Q.1 (a) (b) (c) (15) The frequency of a sound produced from a source in the air is 20Hz. If the sound is produced when the source is in water, the frequency ______________. a. Decreases b. Increases c. Remains the same d. Cannot predict The unit of electric current is __________. a. ampere b. coulomb/second c. volt/ohm d. all the above A conducting wire carries current in the downward direction. Then the direction of the magnetic field created around is _________. a. clockwise b. parallel to the conductor c. anticlockwise d. along the direction of current flowing in the conductor (d) When a radioactive substance is heated, its radioactivity _______________. a. increases b. decreases c. increases and then decreases d. remains the same (e) One dioptre is _____________ a. focal length of the lens in metre c. reciprocal of focal length in metre b. reciprocal of focal length d. reciprocal of focal length in cm (f) A van was moving with a velocity of 20m/s and slows down to 10m/s to take a turn. If the van has a mass of 600kg, the work done by it to take to this turn is _____________. a. 9 104 J b. 9 10-4 J c. 9 103 J d. 9 10-3 J (g) An object is Vibrating at 4000 Hz. The time period of sound produced is ______. a. 0.0025 sec b. 0.025sec c. 0.00025sec d. 0.0005 sec (h) Two identical weights are attached to opposite ends of a beam. Both are 1m from the pivot. If the weight on the right hand side is moved closer to the pivot, __________________. a. the beam rotates clockwise b. the beam will not rotate c. the beam rotates anticlockwise d. the beam will be in equilibrium

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