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STD.IX MATHEMATICS. DON BOSCO ACADEMY, PATNA FIRST TERM EXAMINATION 2020-21 DATE:15.09.2020 F.M. 50 TIME:1 HR 30 MIN Attempt all questions. 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. Students must write their NAME, ROLL NO and PAGE NO on every answer sheet. Attempt all questions. Question-1. Expand the following : i) (3x 2y )2 (ii) (2a + 1 )3 [4] Question-2. From the adjoining figure, find the value of :i) Sin A (ii) Cos L DBC [4] Question-3. In the adjoining diagram , L ABC = 50o Question-4.(i) ii) , Find the value of LBAD. Rationalize the denominator of 2/ Evaluate : 3 x (8) 3 X (5)o 16 25 [4] 9____ 5 + 2 - [4] Question-5. At what rate percent per annum will Rs.6000 amount to Rs.6615 in 2 years when interest is compounded annually? [4] Question-6. In the adjoining diagram, AP and BQ are equal and parallel to each other. Prove that : i) AOP BOQ ii) AB and PQ bisect each other at O . [4]
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