SCIENCE (MCQ Important Question) 



General Instructions : (i) All questions are compulsory. (ii) The questions paper consists of thirty questions divided into 4 sections A, B, C, D. Section ‘A’ comprises of ten questions of 1 marks each, Section ‘B’ comprises of five questions of 2 marks each, Section ‘C’ comprises of ten questions of 3 marks each and Section ‘D’ comprises of five questions of 6 marks each. 

SECTION – A (10 Marks) 

Q.1.  Centroid of triangle whose vertices are A(−4,6), B(2, −2) and C(2, 5) is . a) (0, 2) b) (0, 3) c) (1, 3) d) (1, 2) 

Q.2.  The ratio between the volumes of two spheres is 8 : 27. What is the ratio between their surface areas? a) 2 : 3 b) 4 : 5 c) 5 : 6 d) 4 : 9 

Q.3.  If first term of an AP is a and nth term is b, then its common difference is a) (ba)/n+1 b) (ba)/n1 c) (ba)/n d) none of these 

Q.4.  In a lottery there are 7 prizes and 21 blanks. The probability of getting a prize is. a) 1/2 b) 1/3 c) 1/4 d) 1/5 

Q.5.  A funnel is the combination of a) Cone and a cylinder b) Frustum of a cone and cylinder c) Hemisphere and cylinder d) Hemisphere and cone 

Q.6.  Which was the first book on Probability? 

Q.7.  If the product of roots of the equation ax2 + bx + c = 0 is unity, then a) a = c b) c = b c) b = a d) b2 = 4ac 

Q.8.  The length of the tangent drawn from a point 8cm away from the centre of a circle of radius 6cm is: 

Q.9.  A letter is chosen at random from the letters of the word ‘ASSASSINATION’. Find the probability that the letter chosen is a consonant. a) 1/13 b) 7/13 c) 6/13 d) 2/13 

Q.10.  If k , 2k1 and 2k+1 are three consecutive terms of an A.P. , Find the value of k. 

SECTION  B (10 marks) 

Q.11.  Use factorization method to solve: 

Q.12.  Divide a line segment of length 8 cm internally in the ratio 4:5. Also, give justification of the construction. 

Q.13.  Without drawing the graphs , state whether the following pair of linear equations will represent intersecting lines , coincident lines or parallel lines. 6x  3y + 10 =0 2x  y + 9 = 0 Justify your answer. 

Q.14.  Prove that the perpendicular at the point of contact to the tangent to a circle passes through the centre. 

Q.15.  Solve for by using a completing the square. 

SECTION  C (30 Marks) 

Q.16.  Prove that the diagonals of a rectangle with vertices (0, 0), (a, 0), (a, b) and (0,b) bisect each other and are equal. 

Q.17.  What is the probability that a leap year, selected at random will contain 53 Sundays? 

Q.18.  Find the roots of 4x2 + x – 5 = 0 by the method of completing the square. 

Q.19.  The sum of the 4th and 8th terms of an AP is 24 and the sum of the 6th and 10th terms is 44. Find the first three terms of the AP. 

Q.20.  Two concentric circles are of radii 5cm and 3 cm. Find the length of the chord of the larger circle which touches the smaller circle. 

Q.21.  The cost of fencing a circular field at the rate of Rs 24 per meter is Rs 5280. The field is to be ploughed at the rate of Rs 0.50 per m2. Find the cost of ploughing the field. 

Q.22.  Prove that opposite sides of a quadrilateral circumscribing a circle subtend supplementary angles at the centre of the circle. 

Q.23.  A tree 12m high is broken by the wind in such a way that its top touches the ground and makes an angle of 60^{o }with the ground. At what height from bottom the tree is broken by the wind. Give the answer to the second place of decimal. 

Q.24.  For what value of n, the nth term of the following two A.P.’s are equal? 

Q.25.  Construct an isosceles triangle whose base is 8 cm and altitude 4 cm and then another triangle whose side are times the corresponding sides of the isosceles triangle. 

SECTION  D (30 Marks) 

Q.26.  Water is flowing at 7m/sec through a circular pipe of internal diameter 2 cm into a cylindrical tank the radius of whose base is 40cm. Find the increased in water level in 30 minutes. Or A toy is in the form of a cone mounted on a hemisphere of radius 3.5 cm. If the total height of the toy is 15.5 cm, find its total surface area. 

Q.27.  Show that the points (1, 7), (4, 2), (–1, –1) and (– 4, 4) are the vertices of a square. 

Q.28.  Prove that the lengths of tangents drawn from an external point to circle are equal. 

Q.29.  Construct a triangle of sides 4 cm, 5cm and 6cm and then a triangle similar to it whose side’s are 2/3 of the corresponding sides of the first triangle Give the justification of the construction. 

Q.30.  Sarah Purchases every year National Saving Certificates of value exceeding the last year purchases by Rs.25. After 20 years, she find the total value of certificates purchased by her is Rs.7250. Find the value of the certificates purchased.  