JECA - MATHEMATICS
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Question 1 |
If A be an n × n matrix and C any scalar, then | CA |
A | nC | A | |
B | Cn | A | |
C | nC | A | |
D | C | A | |
Question 2 |
The number of sides of two regular polygons are in the ratio 5 : 4. The difference between their angles is 90. Which one of the following is correct?
A | One of them is a pentagon and the other is a rectangle. |
B | One of them must be a hexagon. |
C | One of them is an octagon. |
D | One of the has 20 sides and the other has 16 sides. |
Question 3 |
The coefficient of the middle term in the expansion of (2 + 3x)4 is
A | 6 |
B | 5! |
C | 8! |
D | 216 |
Question 5 |
The differential of the system of circles touching the y-axis at the origin, is given by
A | x2 + y2 - 2xy dy/dx = 0 |
B | x2 + y2 + 2xy dy/dx = 0 |
C | x2 - y2 + 2xy dy/dx = 0 |
D | x2 - y2 - 2xy dy/dx = 0 |
Question 7 |
A | 1/ x 2 |
B | 1/ x 3 |
C | 1/ x 4 |
D | x 4 |
Question 8 |
The rate at which bacteria multiply is proportional to the instantaneous number present. If the original number doubles in 2 hours, then they will triple in
A | 4 log 2/log 3 hours |
B | 5 log 2/log 3 hours |
C | 2 log 2/log 3 hours |
D | log 2/log 3 hours |
Question 10 |
The number of words that can be formed from the letters of the word INDRAPRASTHA when the vowels are never separated is
A | 727560 |
B | 725760 |
C | 752760 |
D | 757260 |
Question 11 |
The modulus and principle amplitude of (1 + i√3)2 , respectively are
A | 2, - π/2 |
B | 4, 2π/3 |
C | 5/8, tan<>sup>-1(-4/3) |
D | 4, - 3π/4 |
Question 12 |
If 1, ω, ω2 are the cube roots of unity, then value of (x + y)2 to (xω + yω2)2 + (xω2 + yω)2 is equal to
A | xy |
B | 3xy |
C | 6xy |
D | 9xy |
Question 13 |
The number of ways in which 6 people can be seated at a round table is
A | 6 |
B | 60 |
C | 120 |
D | 720 |
Question 14 |
If A ≠ O and both the conditions (i) A.B = A.C (ii) A×B = AxC hold simultaneously, then
A | B=C=0 |
B | B=C |
C | B ≠ C |
D | B ≠ 0 , C ≠ 0 |
Question 16 |
If log8m + log81/6 = 2/3 ,then m is equal to
A | 24 |
B | 18 |
C | 12 |
D | 4 |
Question 17 |
If ax = by = cz ,and logba = logcb ,then which one of the following will hold true?
A | y2 = xz |
B | x2 = yz |
C | z2 = xy |
D | y = xz |
Question 18 |
The area bounded by the coordinate axes and the curve √x + √y = 1 is equal to ?
A | 1 |
B | 1/2 |
C | 1/3 |
D | 1/6 |
Question 19 |
If(x - 2)(x +6 ) ≥ 0, then the solution set is
A | (x:x ≥ 2) |
B | (x:x ≤ 6 ) |
C | (x:x ≤ -6 ) |
D | (x:x ≥ 2 or x ≤ -6 ) |
Question 20 |
The the mth and the nth terms of an H.P. are n and m respectively, then the mnth term is
A | 0 |
B | 1 |
C | 2 |
D | 1/2 |
Question 22 |
The value of tan 31o .tan 32o .tan 32o .tan 33o ...tan 59o is equal to
A | -1 |
B | 0 |
C | 1 |
D | 2 |
Question 23 |
A | A2 + AB + BA + B2 |
B | A2 + 2AB + B2 |
C | A2 + AB + BA + B2I |
D | A2I + AB + BA + B2 |
Question 24 |
The value of 3 - 1 + 1/3 - 1/9 =..... is equal to
A | 20/9 |
B | 9/20 |
C | 9/4 |
D | 4/9 |
Question 25 |
If in the binomial expansion of (1 + x)n when n is a natural number, the coefficients of the 5th, 6th and 7th terms are in A.P., then n is equal to
A | 7 or 13 |
B | 7 or 14 |
C | 7 or 15 |
D | 7 or 17 |
Question 26 |
A | sin-1 y - sin-1 x + c |
B | sin-1 y = 1/2 √1 - x2 + 1/2sin-1 x + c |
C | sin-1 y = 1/2x √1 - x2 + 1/2sin-1 x + c |
D | sin-1 y = 1/2x √1 - x2 + 1/4cos-1 x + c |
Question 28 |
The binary number 10110100001 in decimal system is
A | 441 |
B | 1441 |
C | 1241 |
D | 241 |
Question 29 |
The binary number 1101101 + 1011011 is written in decimal system as
A | 198 |
B | 199 |
C | 200 |
D | 201 |
Question 30 |
The solution of equations 3x + y + 2z = 3; 2x - 3y - z = -3 and x + 2y + z = 4 is
A | x= 3 , y= 2 , z= -2 |
B | x= 2 , y= 1 , z= 3 |
C | x= 1 , y= 2 , z= -1 |
D | x= 1 , y= 2 , z= 1 |
Question 31 |
In a Euclidean plane, which one of the following is not an equivalence relation?
A | Parallelism of lines (a line being deemed parallel to itself) |
B | Congruence of triangles |
C | Similarity of triangles |
D | Orthogonality of lines |
Question 32 |
There are 600 students in a school, If 400 of them can speak Telugu, 300 can speak Hindi, then the number of students who can speak both Telugu and Hindi are
A | 100 |
B | 200 |
C | 300 |
D | 400 |
Question 33 |
A | both AB and BA exist |
B | neither AB nor BA exists |
C | AB exists but BA does not exists |
D | AB does not exist but BA exist |
Question 34 |
If b→ is a unit vector in the xy-plane making an angle of π/4 with the x-axis, then b→ is equal to
A | iˆ + jˆ |
B | iˆ - jˆ |
C | (iˆ + jˆ) / √2 |
D | (iˆ - jˆ) / √2 |
Question 36 |
A | x - 3 |
B | x - y |
C | y - 3 |
D | (x - 3)(y - 3) |
Question 37 |
A | α = 1/√2 , β = 1/√2 |
B | α = -1/√2 , β = 1/√2 |
C | α = β = ±1/√2 |
D | α = -β = ±1/√2 |
Question 38 |
A | a circle with the centre (0, 0) and radius 1 |
B | the x-axis |
C | the y-axis |
D | the line y = x + 1 |
Question 40 |
y – A cos ωt + B sin ωt is a solution of the differential equation
A | d2y / dt2 - ω2y = 0 |
B | d2y / dt2 - ωy = 0 |
C | d2y / dt2 + ωy = 0 |
D | d2y / dt2 + ω2y = 0 |
Question 41 |
The number of 2-digit even numbers that can be formed from the digits 1, 2, 3, 4 and 5, repetition being not allowed, is
A | 25 |
B | 5! |
C | 16 |
D | 8 |
Question 42 |
If the equations x2 −px +q = 0 and x2 +qx -p = 0 have a common root, then which one of the following will hold true?
A | p = q |
B | p + q = 2 |
C | p + q = 1 |
D | p – q = 1 |
Question 43 |
The general solution of dy/dx + y = sin x is
A | y = ce-2x + 1/4 sin x - 1/2 cos x |
B | y = ce-x + 1/2 sin x - 1/2 cos x |
C | y = ce-3x + sin x |
D | y = ce-x |
Question 44 |
If (x + 1/x) = 3 , then (x6 + 1/x6) is equal to
A | 927 |
B | 414 |
C | 364 |
D | 322 |
Question 46 |
Distance between two points whose position vectors are 3iˆ + jˆ - 2kˆ and iˆ - 3jˆ + 5kˆ
A | 69 units |
B | √69 units |
C | 13 units |
D | 29 units |
Question 47 |
The binary equivalent to the decimal number 0.3125
A | 0101 |
B | .1010 |
C | .0101 |
D | .1101 |
Question 48 |
α, β, ξ, η are non-empty sets then
A | (α x β) ∪ (ξ x η) = (α x β) ∩ (ξ x η) |
B | (α x β) ∩ (ξ x η) = (α x ξ) ∩ (β x η) |
C | (α x β) x (ξ x η) = (α x ξ) ∪ (β x η) |
D | (α x β) x (ξ x η) = (α x η) ∪ (β x ξ ) |
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