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SECOND PRELIMINARY EXAMINATION Grade: X Subject: Mathematics Date: 27 January, 2021 Time: 2hours 30 minutes Max. Marks: 80 _______________________________________________________________________________ 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 Section A and any four questions from Section B. All working, including rough work, must be clearly shown and must be done on the same sheet as the rest of the answer. Omission of essential working will result in loss of marks. The intended marks for questions or parts of questions are given in brackets ( ). ________________________________________________________________________________ SECTION A (40 Marks) Attempt all questions from this Section Question 1 sec60 cos90 cos90 cot45 2 (i) (a) If A = and B = , find A + BA. -3tan45 sin90 -4sin30 3sin90 (3) (b) Find the sum of all odd numbers between 100 and 150. (3) (c) If a, b, c, d are in continued proportion, prove that : (4) a 2 +b2 +c 2 b2 +c 2 + d2 = ab +bc +cd 2 Page 1 of 5
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