Kerala Plus Two Maths Previous Year Question Paper March 2017 with Answers

Time: 2½ Hours
Cool off time : 15 Minutes

General Instructions to Candidates

• There is a ‘cool off time’ of 15 minutes in addition to the writing time of 2½ hrs.
• During the ‘cool off’ period, you cannot type your answers or discuss anything with anyone.
• Use the ‘cool off time’ to familiarize yourself with the questions and to prepare your answers.
• Read questions carefully before you answer.
• Only internal choice is allowed and all questions are compulsory.
• Selecting a question means answering all the sub-questions from that question.
• The answer sheet itself should include calculations, graphs, and figures.
• Malayalam version of the questions is also provided.
• Provide equations whenever necessary.
• In the Examination Hall, electronic devices other than non-programmable calculators are not permitted.

Question 1.
a. Let R be a relation defined on A = {1,2, 3} by R = {(1,3), (3, 1), (2, 2)}.R is
a. Reflexive
b. Symmetric
c. Transitive
d. Reflexive but not transitive

b. Find fog and gof if f(x) = |x + 1| and g(x) = 2x – 1.

c. Let * be a binary operation defined on N x N by (a, b) * (c, d) = (a + c, b + d). Find the identity element for * if it exists.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.
Slope of the normal to the curve y² = 4x at (1, 2) is
a. 1
b. 12
c. 2
d.-1

b. Find the interval in which 2x³ + 9x² + 12x – 1 is strictly increasing.
OR
a. The rate of change of volume of a sphere with respect to its radius when the radius is 1 unit
a. 4π
b. 2π
c. π
d. π2

b. Find two positive numbers whose sum is 16 and the sum of whose cubes are minimum.

Question 7.

Question 8.

Question 9.

Question 10.

Question 11.

Question 12.
a. The angle between the vectors iˆ + jˆ and jˆ + kˆ is
(i) 60°
(ii) 30°
(iii) 45°
(iv) 90°

Question 13.
a. The line x – 1 = y = z is perpendicular to the line

b. Find the shortest distance between the lines

Question 14.

Question 15.
Consider the linear programming problem :
Maximize Z = 50x + 40y
Subject to the constraints
x + 2y > 10
3x + 4y < 24
x > 0, y > 0
a. Find the feasible region.
b. Find the comer points of the feasible region.
c. Find the maximum value of Z.
Maximize Z = 50x + 40y
Subject to the constraints
x + 2y > 10
3x + 4y < 24
x > 0, y > 0

Question 16.
If A and B are two events such that A ⊂ B and P(A) ≠ then P (A/B) is
a. P(A)P(B)
b. P(B)P(A)
c. 1P(A)
d. 1P(B)

b. There are two identical bags. Bag I contains 3 red and 4 black balls while Bag II contains 5 red and 4 black balls. One ball is drawn at random from one of the bags.
i. Find the probability that the ball is drawn is red.
ii. If the ball drawn is red what is the probability that it was drawn from the bag I?
OR
Consider the following probability distribution of a random variable X.