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CBSE Class 10 Pre Board 2020 : Mathematics Standard - Prelim 2 (Delhi Public School (DPS), Jammu)

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DELHI PUBLIC SCHOOL, JAMMU PRE BOARD-II Assignment (Standard) Class:X Sub:-Mathematics Section A (Objective Type) MCQ (1 to 10) 1. Given the HCF (253,550) = 11 and LCM(253,550) = 253x R . The value of R is (a) 400 (b) 40 (c) 440 (d) 50 2. Which of the following is irrational? (a) 16 + 9 (b) 25 + 4 (c) 4 + 9 (d) 3 + 5 3. If the zeroes of the quadratic polynomial x2 +a x + b are 2 and -3, then (a) a = 0, b = -6 (b) a = 2, b = -6 (c) a = 5, b = -1 (d) a=1, b= -1.5 4. If and are the zeroes of p(x) = x2- 5x + 6, then the value of + - is (a) -23 (b) -1 (c) 13 (d) 23 1 5. If sin = 3, then the value of 2 cot2 + 2 is equal to: (a) 6 (b) 9 (c) 4 (d) 18 6. In a right triangle ABC , right angled at B, BC=15cm, AB=8cm. A circle is inscribed in triangle ABC .The radius of the circle is (a) 1cm (b) 2cm (c) 3cm (d) 4cm. 7. If D,E,F are mid points of sides BC, CA, AB respectively of triangle ABC, then the ratios of the area of triangle DEF and ABC is (a) 1:4 (b) 1:2 (c) 2:3 (d) 4:5 8. If ABC and DEF are similar such that 2AB = DE and BC= 10cm, then EF= (a) 16cm (b) 12cm (c) 20cm (d) 4cm 9. If (x,2), (-3,-4) and (7,-5) are collinear, then x= (a) 60 (b) 63 (c) -63 (d) -60 10. The ratio in which (4,5) divides the join of (2,3) and (7,8) is (a) 4:3 (b) 5:2 (c) 3:2 (d) 2:3 Fill in the blanks (11-15) 11. Probability of definate event is _______________________________________ 12. Probability of an even prime number in a die is ___________________________ 13. Total number of outcomes when three dice are thrown simultaneously __________ 14. If a and b are the roots of x2+ 2ax + 3b=0 , a+b = __________________________ 15. For AP 10,15,20,25,--- . 200th term is _____________________________________ Very short type (16-20) 16. In deck of playing cards, find probability of red face card. 17. Find discriminant for 3x2 + 8x 5=0. ~1~

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