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___________________________________________________________________________ PHYSICS SCIENCE Paper 1 (Two hours) 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. ___________________________________________________________________________ Section I is compulsory. Attempt any four questions from Section II. 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) Mention two factors on which the internal resistance of a cell depends. (b) Name two safety devices which are connected to the live wire of a household electrical circuit. Give one important function of each of these two devices. (c) A current is passed through a steel wire, which gets heated, to a dull red. Then half the wire is immersed in cold water. The portion out of the water becomes bright. Why? (d) Why should the core of a transformer be laminated? (e) Which coil of a step-up transformer is made thicker and why? Question 2 (a) A device is used to transform 20 V A.C. to 200 V A.C. (i) What is the name of the transformer? (ii) Name the principles on which it works. (b) Define the term Heat capacity and state its SI unit? (c) What is the principle of method of mixtures? What is the other name given to it? (d) Why do sandy soils, get heated up quickly as compared to wet soils? (e) Which of the two, 1 g of ice at 0o C or 1 g of water at 0o C contains more heat? Give reason for your answer. Question 3 (a) Some ice is heated at a constant rate, and its temperature is recorded after every few seconds, till steam is formed at 100o C. Draw a temperature -time graph to represent the change. Labels the two phase in your graph. (b) Name the rule to determine the direction of (i) Magnetic field produced around a current carrying conductor. (ii) Force experienced by a straight conductor carrying current placed in a magnetic field which is perpendicular to it. 1 ICSE (Grade : X) | PHYSICS (SCIENCE Paper-I) | Pre Board Exam-II [2] [2] [2] [2] [2] [2] [2] [2] [2] [2] [2] [2]
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