Mrs. JAYA.S PGT (MATHS)
Date of submission: 07-01-2011 by CLASS-XII-B.
CLASS-XII-B - MATHS( 1mark QUESTIONS)
2 If 
, .Find (-1.2) * (3, -4).
6.If A is a 3 x 3 matrix , =12, Find
7.If A is a 3 x3 matrix =-4 .Find
8.Find , =3 and A is a 4 x4 matrix.
9.Find the derivative of sinx w.r. to logx.
16.Find the direction ratios of line, 6x-2 = 2y =z-3.
17.Find the direction cosines if ratios are , 2, 1, 3.
18.Find the order and degree of,
19. .Find the integrating factor of ,
20.Find the value of p, line is parallel to the plane, px +3y-z+5=0
21.Abag contains 5 red, 6 blue, 4 black balls. Three balls are drawn .Find the probability that none of them is red.
.22.Find the rate of change of area of circle with respect to its radius r , when r= 6.
23.If sum of two unit vectors is also a unit vector, find the angle between them
24.If A and B are independent events, such that, P( AU B)= 0.8, P(A)=0.5,.find P(B).
25.At what points on the curve , does the ordinate decrease as same rate as abscissa increases
26.For what values of k, A= is not invertible.
27.A coin is tossed 5 times , and getting a head is considered as success. Find the probability of getting no success.
29.If A is an invertible matrix of order 2. Find .
30. Find the identity element for the operation a*b=ab/4, in QxQ, Q is set of rational numbers.
37.If A is any matrix such that I AI = 12. find A. adj A.
38.Find whether f(x) = 1/x is strictly increasing or decreasing function.
39.For any vector a , ,find (a .i) i + (a. j) .j +a .k) .k .
40.Find sine of angle between the vectors a and b, a x b = 3i -6j-5k and I a I = and Ib I= .
