alok vidyashram wi ter vacatio holiday homework-2011-12

ALOK VIDYASHRAM
WITER VACATIO HOLIDAY HOMEWORK-2011-12
17. Subtract 4a +3b – 3c from 9a – 5b + 6c Answer: 2a – b + 3c
Divide 12x 2 – 32xy – 35y 2 by 2x – 7y Answer: 6x + 5y
19. If a +b = 7, ab = 12, find the value of (a-b)2 Answer: 1
20. Find the square of x – 4y. Answer: x 2 – 8xy + 16y 2
21. Find the square of 999 without actual multiplication. Answer:
998001
22. Find the continued product of (1 + x)(1 – x)(1 + x 2 ) Answer: 1 – x 4
23. Simplify:
3.98x3.98
− 2.42x2.42
3.98 + 2.42
Answer: 1.56
24. Find the cube of 2a +5b. Answer: 8a 3 + 60a 2 b + 150ab 2 + 125b 3
25. Factorise:
a. 3a + 6b b. 15x 2 – 20xy c. X 2 – 3x – ax – 3a d. 4x 2 –
25 e. x 4 – y 4 f. x 2 + 5x + 6 g. 3a 2 + 21a + 36 h. x 2 + 10x –
24
26. Find the HCF of 5x + 10y and 3x + 6y Answer: HCF =
27. Find the LCM of p 2 – q 2 and p 2 + pq Answer: LCM = p(p + q)(p – q)
28. In a class of 60 students, 35 are boys. Find the ratio of
a. number of boys to the number of girls. b. number of girls to the total number
of students.
29. Determine whether 8:10 and 12:18 are in proportion.
30. Find the ratio of Rs1.5 and 350 paisa.
31. If 3, 5, 9 and x are in proportion, find the value of x.
32. Divide Rs 600 between Aman and Baman in the ratio of 3:5.
33. Draw a line segment of 8.5 cm and bisect it perpendicularly.
34. Construct an angle of
a. 105 0 b. 75 0 c. 45 0
SCIENCE Make a model of Human respiratory system
make a list of enzyme that is used in digestion process
make a list of 4 unisexual and 4 bisexual flowers
Difference between concave and convex lens
NEPALI cf]sl;6df lbOPsf] k"/f u/]/ Nofpm .