Board : Central Board Of Secondary Education
Exam : Class XII
Subject : Mathematics
Document Type : Sample Question Paper
Website : cbse.nic.in
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/cbse.nic.in/7034-Math2(2).pdf
Mathematics Sample Question Paper – II :
Class XII :
Time : 3 Hours
Max. Marks : 100
Related : Central Board Of Secondary Education AISSCE Marketing Question Paper : www.pdfquestion.in/6650.html
General Instructions :
1. All questions are compulsory.
2. The question paper consists of 29 questions divided into three sections A, B and C. Section A comprises of 10 questions of one mark each, section B comprises of 12 questions of four marks each and section C comprises of 07 questions of six marks each.
3. All questions in Section A are to be answered in one word, one sentence or as per the exact requirement of the question.
4. There is no overall choice. However, internal choice has been provided in 04 questions of four marks each and 02 questions of six marks each. You have to attempt only one of the alternatives in all such questions.
5. Use of calculators is not permitted. You may ask for logarithmic tables, if required.
SECTION – A :
Q.1. If A is a square matrix of order 3 such that |adj A| = 64, find |A|.
Q.2. If A, B, C are three non zero square matrices of same order, find the condition on A such that AB = AC B = C
Q.3. Give an example of two non zero 2 × 2 matrices A, B such that AB = 0.
Q.4. If f (1) = 4; f ‘ (1) = 2, find the value of the derivative of log f(ex) w.r.t x at the point x = 0.
Q.5. Find a, for which f(x) = a(x + sin x) + a is increasing.
Q.6. Evaluate, (where [x] is greatest integer function)
Q.7. Write the order and degree of the differential equation, find a unit vector in the direction of a + b+ c
Q.9. A four digit number is formed using the digits 1, 2, 3, 5 with no repetitions. Find the probability that the number is divisible by 5.
Q.10. The probability that an event happens in one trial of an experiment is 0.4. Three independent trials of the experiment are performed. Find the probability that the event happens at least once.
SECTION – B :
prove that (aI + bA)n = a n .I + na n-1bA where I is a unit matrix of order 2 and n is a positive integer
Q.14. Find the equations of tangent lines to the curve y = 4×3 -3x + 5 which are perpendicular to the line 9y + x + 3 = 0 .
Q.15. Show that the function f (x) = x + 2 is continuous at every x?R but fails to be differentiable at x = –2.
Find an expression for the area of ABC and hence deduce the condition for the points A, B, C to be collinear.
OR
Q.21. In a bolt factory machines, A, B and C manufacture respectively 25%, 35% and 40% of the total bolts. Of their output 5, 4 and 2 percent are respectively defective bolts. A bolt is drawn at random from the product.
(i) What is the probability that the bolt drawn is defective ?
(ii) If the bolt is found to be defective find the probability that it is a product of machine B.
Q.22. Two dice are thrown simultaneously. Let X denote the number of sixes, find the probability distribution of X. Also find the mean and variance of X, using the probability distribution table.
SECTION – C :
Q.23. Let X be a non-empty set. P(x) be its power set. Let ‘*’ be an operation defined on elements of P(x) by,
Then,
(i) Prove that * is a binary operation in P(X).
(ii) Is * commutative ?
(iii) Is * associative ?
(iv) Find the identity element in P(X) w.r.t. *
(v) Find all the invertible elements of P(X)
(vi) If o is another binary operation defined on P(X) as A o B = , then verify that o distributes itself over *. (35)
OR
Consider f : R+? [–5, 8) given by f(x) = 9×2 + 6x – 5. Show that f is invertible. Find the inverse of f.
Q.24. A window has the shape of a rectangle surmounted by an equilateral triangle. If the perimeter of the window is 12m, find the dimensions of the rectangle that will produce the largest area of the window.
Q.25. Make a rough sketch of the region given below and find it’s area using integration{ (x, y) ; y2 = 4x, 4×2 + 4y2 = 9}
Q.26. Every gram of wheat provides 0.1 gm of proteins and 0.25 gm of carbohydrates. The corresponding values for rice are 0.05 gm and 0.5 gm respectively. Wheat costs Rs. 4 per kg and rice Rs. 6 per kg. The minimum daily requirements of proteins and carbohydrates for an average child are 50 gms and 200 gms respectively. In what quantities should wheat and rice be mixed in the daily diet to provide minimum daily requirements of proteins and carbohydrates at minimum cost. Frame an L.P.P. and solve it graphically.