2023 NDA -1 Math-832

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2023 NDA -1 Math (Test Code: 832)

  1. a

  2. b

  3. c

  4. d

What is the number of 6-digit numbers that can be  fonned  only  by  using  0, 1, 2, 3, 4 and 5 (each once); and divisible by 6 ?

  1. 96

  2. 120

  3. 192

  4. 312

What is the binary number equivalent to decimal number 1011 ?

  1. 1011

  2. 111011

  3. 11111001

  4. 111110011

Let A be a  matrix  of  order  3x3  and IAI = 4. If |2 adj(3A)| = 2a3β, then what is the value of (a + β) ?

  1. 12

  2. 13

  3. 17

  4. 24

  1. a

  2. b

  3. c

  4. d

Let A and  B  be  symmetric  matrices of same  order,  then  which  one  of the following is correct regarding (AB-BA)?
1. . Its diagonal  entries  are equal but nonzero
2. The sum of its non-diagonal entries is zero
Select the correct answer using the code given below :

  1. 1 only

  2. 2 only

  3. Both 1 and 2

  4. Neither 1 nor 2

Consider the following statements in respect of square matrices A,B, C each of same order n :

1. AB= AC⇒B = C if A ts non­singular
2. If BX= CX for every column matrix X having n rows then B=C
Which of the statements given above is/are correct ?

  1. 1 only

  2. 2 only

  3. Both 1 and 2

  4. Neither I nor 2

  1. a

  2. b

  3. c

  4. d

Let AX= B be a system of 3 linear equations with 3-unknowns. Let X1 and X2 be its two distinct solutions. If thecombination aX1 + bX2 is a solution of AX= B; where a, b are real numbers, then which  one  of the following is correct ?

  1. a= b

  2. a+ b = 1

  3. a+ b = 0

  4. a -  b  = 1

What is the sum of the roots of the 
equation | 0        x-a     x-b |
               | 0          o      x-c |  =  0
               |  x+b       x+c   1 |  

  1. a + b + c

  2. a - b + c

  3. a + b - c

  4. a - b - c

If 2 - i √3  where i = √-1  is  a  root of the equation x2 + ax+ b = 0, then what is the value of(a+ b)?

  1. -11

  2. -3

  3. 0

  4. 3

  1. a

  2. b

  3. c

  4. d

  1. a

  2. b

  3. c

  4. d

  1. a

  2. b

  3. c

  4. d

  1. a

  2. b

  3. c

  4. d

  1. 5

  2. 6

  3. 7

  4. n cannot be determined

For how many integral values of k, the equation x2- 4x + k = 0, where k is an integer has real roots and both of them lie in the interval (0, 5) ?

  1. 3

  2. 4

  3. 5

  4. 6

  1. a

  2. b

  3. c

  4. d

  1. a

  2. b

  3. c

  4. d

  1. a

  2. b

  3. c

  4. d

  1. a

  2. b

  3. c

  4. d

A mapping f': A → B defined as
f'(x) =  2x+3/3x+5, x € A
If f' to be onto, then what are A and B equal to ?

  1. A = R\{-j} and B = R\{-f}

  2. A= Rand B = R\{-j}

  3. A=R\{-f} and B == R\{0}

  4. A=R\{-5/3} and B = R\{2/3}

a  and  β are  distinct  real  roots  of  the quadratic equation x2+ ax+ b = 0.
Which of the following statements is/are sufficient to find a?

1. a+β= 0, a22 = 2
2. aβ2 = -1, a = 0
Select the correct answer using the code given below :

  1. I only

  2. 2 only

  3. Both I and 2

  4. Neither I nor 2

  1. 6

  2. 8

  3. 9

  4. 10

How many terms are there in the expansion of (3x- y )4(x + 3y )4  ?

  1. 9

  2. 12

  3. 15

  4. 17

p,  q,  r and  s  are  in  AP  such   that p + s = 8 and qr= 15. What is the difference between largest and smallest numbers?

  1. 6

  2. 5

  3. 4

  4. 3

Consider the following statements for a fixed natural number n :

1. C (n,r) is greatest if n = 2r

2. C (n,r) is greatest if n = 2r - 1 and n = 2r + 1.

Which of the statements given above is/are correct?

  1. 1 only

  2. 2 only

  3. Both 1 and 2

  4. Neither 1 nor 2

m parallel lines cut n parallel lines giving rise to 60 parallelograms. What is the value of (m + n)?

  1. 6

  2. 7

  3. 8

  4. 9

Let x be the number of permutations of the word ' PERMUTATIONS' andy be the number of permutations of the word ' COMBINATIONS.' Which one of the following is correct ?

  1. x  = y

  2. y  = 2x

  3. x  = 4y

  4. y  = 4x

5-digit numbers are formed using the digits 0, 1, 2, 4, 5 without repetition. What is the percentage of numbers which are greater than 50,000?

  1. 20%

  2. 25%

  3. 75%

  4. 100%

What is cos2β equal to?

  1. (cosa - sina)2

  2. (cosa + sina)2

  3. (cosa - sina)3

  4. (cosa - + sina)3

Waht is value of sec2y?

  1. \frac{3-sin2a}{5+2sin2a}

  2. \frac{5+sin2a}{3-sin2a}

  3. \frac{3-2sin2a}{4+2sin2a}

  4. \frac{3-sin2a}{4+3sin2a}

Consider the following for the next two (02 items) that follow:

A flagstaff 20m  long standing on a pillar 10m high subtends an angles tan-1(0.5) at a pointg P on the ground. Let θ be the angle by the pillar at this point P.

Question:

If x is the distance of P from bottom of the pillar, then consider the following statem nts :

1. x can take two values which are in the ratio 1 : 3
2. x can be equal to height of the flagstaff
Which of the statements given above is/are correct ?

  1. 1 only

  2. 2 only

  3. Both 1 and 2

  4. Neither 1 nor 2

Consider the following for the next two (02 items) that follow:

A flagstaff 20m  long standing on a pillar 10m high subtends an angles tan-1(0.5) at a pointg P on the ground. Let θ be the angle by the pillar at this point P.

Question:

What is a possible value of tan θ ?

  1. \frac{3}{4}

  2. \frac{2}{3}

  3. \frac{1}{3}

  4. \frac{1}{4}

Consider the following for the next two (02) items that follow:

The perimeter of a triangle  ABC is 6 times the AM of sine of angles the triangle.

Further BC = √3 and CA = 1.

Question:

What is the perimeter of the triangle ?

  1. √3 + l

  2. √3 +2

  3. √3 + 3

  4. 2√ 3 + 1

Consider the following for the next two (02) items that follow:

The perimeter of a triangle  ABC is 6 times the AM of sine of angles the triangle.

Further BC = √3 and CA = 1.

Question:

Consider the following statements  :
1. ABC  is  right angled triangle
2. The angles of the triangle are in AP
Which of the statements given above is/are correct?

  1. 1 only

  2. 2 only

  3. Both 1 and 2

  4. Neither I nor 2

Consider the following for the nextg two (02) items that follow:

Let x = sin2A+sinA+1 where 0 < A ≤ π/2
            sin A

Question:

What is the minimum value of x ?

  1. 1

  2. 2

  3. 3

  4. 4

Consider the following for the nextg two (02) items that follow:

Let x = sin2A+sinA+1 where 0 < A ≤ π/2
            sin A

Question:

At what value of A does x attain the minimum value ?

  1. π/6

  2. π/4

  3. π/3

  4. π/2

Consider the following for the next two (02) items that follow :
In the triangle ABC,
a2+b2+c2 = ac+ √3 bc

Question:

What is the nature of the triangle ?

  1. Equilateral

  2. Isosceles

  3. Right angled triangle

  4. Scalene but not right angled

Consider the following for the next two (02) items that follow :
In the triangle ABC,
a2+b2+c2 = ac+ √3 bc

Question:

If  c = 8, what is the area of the triangle?

  1. 4√3

  2. 6√3

  3. 8√3

  4. 12√3

Question:

At what value of x does the function attain minimum value ?

  1. 2

  2. 3

  3. 4

  4. 0

Question:

What is the minimum value of the function?

  1. 2

  2. 3

  3. 4

  4. 0

Question:

If the sum S is divided  by  8,  what is the remainder ?

  1. 0

  2. 1

  3. 2

  4. Cannot be determined

Question:

If the sum S is divided by 60, what is the remainder ?

  1. 1

  2. 3

  3. 17

  4. 34

Question:

What is the value of n ?

  1. 4

  2. 6

  3. 8

  4. 10

Question:

What is the length of the smallest side?

  1. 12

  2. 14

  3. 16

  4. 18

Consider the following for the (02) items that follow :
Given that next two
 
sin x+cos x+tan x+  cot x+sec x+cosec x  = 7

Question:

  1. a

  2. b

  3. c

  4. d

Consider the following for the (02) items that follow :
Given that next two
 
sin x+cos x+tan x+  cot x+sec x+cosec x  = 7

Question:

  1. 0

  2. 14

  3. 21

  4. 28

Question:

What is the HM of the roots of the equation?

  1. 2

  2. 4

  3. 2√2

  4. 2√3

Question:

  1. a

  2. b

  3. c

  4. d

Consider the following for the next two (02) items that follow:

Let ? (a,b,c,a) = | a         b         aα+b)
                          |  b         c         bα+c)
                          |aα+b  ba+c          0  )                                        

Question:

If ? (a, b, c, a)= 0 for every a > 0, then which one of the following is correct?

  1. a, b, c are in AP

  2. a, b, c are in GP

  3. a, 2b, c are in AP

  4. a, 2b, c are in GP

Consider the following for the next two (02) items that follow:

Let ? (a,b,c,a) = | a         b         aα+b)
                          |  b         c         bα+c)
                          |aα+b  ba+c          0  )                                        

Question:

  1. a

  2. b

  3. c

  4. d

Question:

What is the least value of m(θ) ?

  1. n

  2. 2n

  3. 3n

  4. 4n

Question:

Under what condition does m attain the least value ?

  1. n = tan2θ

  2. n = cot2θ

  3. n = sin 2θ

  4. n = cos2θ

Consider the following for the next two (02) items that follow :
A quadrilateral is formed by the lines
x=0,y=O, x+y= 1 and 6x+y=3.

Question:

What is the equation of diagonal through origin ?

  1. 3x + y = 0

  2. 2x  + 3y  = 0

  3. 3x - 2y = 0

  4. 3x + 2y = 0

Consider the following for the next two (02) items that follow :
A quadrilateral is formed by the lines
x=0,y=O, x+y= 1 and 6x+y=3.

Question:

hat is the equation of other diago­ nal?

  1. x  + 2y -  1 = 0

  2. x  -    2y - 1  = 0

  3. 2x + y + 1 = 0

  4. 2x + y - 1 = 0

Question:

What is PE+ PF equal to?

  1. 1

  2. 2

  3. 3

  4. 4

Question:

  1. a

  2. b

  3. c

  4. d

Consider the following for the next two (02) items that follow :
The line y = x partitions the circle
( x- a)2 + y2 = a2 in two segments.

Question:

  1. a

  2. b

  3. c

  4. d

Consider the following for the next two (02) items that follow :
The line y = x partitions the circle
( x- a)2 + y2 = a2 in two segments.

Question:

  1. a

  2. b

  3. c

  4. d

Question:

What is u + v + w equal to ?

  1. -2

  2. -1

  3. 1

  4. 2

Question:

If P(x, y, z) is any point on the sphere, then what is PA2+ PB2 equal to ?

  1. 15

  2. 14

  3. 13

  4. 6.5

Question:

What is the value of k ?

  1. 4

  2. 2

  3. 1

  4. -1

Question:

What are the direction ratios of a line which is perpendicular to both the lines?

  1. (1, 2, 10)

  2. (-1, -2, 10)

  3. (11, 12, -10)

  4. (11, 2, - 10)

Question:

  1. a

  2. b

  3. c

  4. d

Question:

                                              → →     →

What is the angle between  (a+b) and c

  1. π/2

  2. π/3

  3. π/4

  4. π/6

Consider the following for the next two (02 items) that follow:

Let a vector a = 4î - 8 j + k make angles a, β, y with the positive directons of x,y,z axes respectively.

Question:

What is cosa equal to ?

  1. \frac{1}{3}

  2. \frac{4}{9}

  3. \frac{5}{9}

  4. \frac{2}{3}

Consider the following for the next two (02 items) that follow:

Let a vector a = 4î - 8 j + k make angles a, β, y with the positive directons of x,y,z axes respectively.

Question:

What is cos2β + cos2y equal to ? 

  1. -\frac{32}{81}

  2. -\frac{16}{81}

  3. \frac{16}{81}

  4. \frac{32}{81}

Consider the following for the next two (02) items that follow:

The position vectors of two points A and B are î -î and î + k respectively.

Question:

Consider the following points :

1. (-1, -3, 1)

2. (- 1, 3, 2)

3. (- 2, 5, 3)

Which of the above points lie on the line joining A and B ?

  1. 1 and 2 only

  2. 2  and  3 only

  3. 1 and 3 only

  4. 1, 2 and 3

Consider the following for the next two (02) items that follow:

The position vectors of two points A and B are î -î and î + k respectively.

Question:

What  is the magnitude of →AB  ?

  1. 2

  2. 3

  3. √6

  4. √3

Consider the following for the next three (03) items that follow :

Let f (x) = Pex+ Qe2x + Re3x, where P, Q, R  are   real numbers. Further /(0)=6, f'(ln 3) 282 and f  (x)dx =11

Question:

What is the value of Q ?

  1. 1

  2. 2

  3. 3

  4. 4

Consider the following for the next three (03) items that follow :

Let f (x) = Pex+ Qe2x + Re3x, where P, Q, R  are   real numbers. Further /(0)=6, f'(ln 3) 282 and f  (x)dx =11

Question:

What is the value of R ?

  1. 1

  2. 2

  3. 3

  4. 4

Consider the following for the next three (03) items that follow :

Let f (x) = Pex+ Qe2x + Re3x, where P, Q, R  are   real numbers. Further /(0)=6, f'(ln 3) 282 and f  (x)dx =11

Question:

What is f'(0) equal to ?

  1. 18

  2. 16

  3. 15

  4. 14

Consider the following for the next two (02) items that follow :
Suppose E is the differential equation representing family of curves y2 = 2cx +2c√c where c is a positive parameter.

Question:

What is the order of the differential equation?

  1. 1

  2. 2

  3. 3

  4. 4

Consider the following for the next two (02) items that follow :
Suppose E is the differential equation representing family of curves y2 = 2cx +2c√c where c is a positive parameter.

Question:

What is the degree of the differential equation?

  1. 2

  2. 3

  3. 4

  4. Degree does not exist

Consider  the  following  for  the  next  three (03) items that follow :
Let f' (x) =      | cos x    x     1     |
                      | 2sin x   x2   2x    | 
                      | tax x      x    1     |

Question:

What is f'(0) equal to ?

  1. -1

  2. 0

  3. 1

  4. 2

Consider  the  following  for  the  next  three (03) items that follow :
Let f' (x) =      | cos x    x     1     |
                      | 2sin x   x2   2x    | 
                      | tax x      x    1     |

Question:

What is lim    f'(x) equal to ?

             x→     x

  1. -1

  2. 0

  3. 1

  4. 2

Consider  the  following  for  the  next  three (03) items that follow :
Let f' (x) =      | cos x    x     1     |
                      | 2sin x   x2   2x    | 
                      | tax x      x    1     |

Question:

What is lim      f'(x)  equal to ?

          x→0       x2

  1. -1

  2. 0

  3. 1

  4. 2

Consider the following for the next two (02) items that follow :

Let f(x) = sin[n2]x+cos[-π2]x + cos[-π2] where  [.] is a greatest integer function.

Question:

  1. -1

  2. 0

  3. 1

  4. 2

Consider the following for the next two (02) items that follow :

Let f(x) = sin[n2]x+cos[-π2]x + cos[-π2] where  [.] is a greatest integer function.

Question:

What is f {π/4} equal to ? 

  1. 0

  2. -1

  3. 1

  4. 1/√2

     

Consider the following for the next three (030 items that follow :

Question:

What is value of I1+I2/I1-I2

  1. 1

  2.  π

  3.  π2

  4.  π3

Consider the following for the next three (030 items that follow :

Question:

What is the value of 8I21 ?

  1. π

  2. π2

  3. π3

  4. π4

Consider the following for the next three (030 items that follow :

Question:

What is value of I2?

  1. \frac{\pi }{\sqrt{2}}

  2. \frac{\pi }{\sqrt{3}}

  3. \frac{\pi }{\sqrt{4}}

  4. \frac{\pi }{\sqrt{5}}

Consider the fdollowing for next tgwo (02) itemks that follow:

Question:

  1. a

  2. b

  3. c

  4. d

Consider the fdollowing for next tgwo (02) itemks that follow:

Question:

What is I equal to when a < b < 0 ?

  1. a + b

  2. a - b

  3. b - a

  4. a + - b

Considering the following for the next three (03) items that follow:

Let f'(x) = |Inx|,x ≠1

Question:

What is the derivative of f'(x) at x=0.5?

  1. -2

  2. -1

  3. 1

  4. 2

Considering the following for the next three (03) items that follow:

Let f'(x) = |Inx|,x ≠1

Question:

What is the derivative of f'(x) atx = 2?

  1. -\frac{1}{2}

  2. -1

  3. \frac{1}{2}

  4. 2

Considering the following for the next three (03) items that follow:

Let f'(x) = |Inx|,x ≠1

Question:

What is the derivative of f°f(x), where 1

  1. \frac{1}{Inx}

  2. \frac{1}{xInx}

  3. \frac{1}{-Inx}

  4. -\frac{1}{xInx}

Consider the following for next (2) two items that follow :

                  |  x + 6, x ≤ 1 
 Let f'(x) =  |  px + q, 1 < x < 2
                  |  5x, x ≥ 2  

and f'(x) is continuous

       

Question:

What is the value of p ?

  1. 2

  2. 3

  3. 4

  4. 5

Consider the following for next (2) two items that follow :

                  |  x + 6, x ≤ 1 
 Let f'(x) =  |  px + q, 1 < x < 2
                  |  5x, x ≥ 2  

and f'(x) is continuous

       

Question:

What is the value of q ?

  1. 2

  2. 3

  3. 4

  4. 5

  1. 1 only

  2. 2 only

  3. Both l and 2

  4. Neither I nor 2

What is the derivative of sin2x with respect to cos2x ?

  1. -1

  2. 1

  3. sin2x

  4. cos2x

For what value of m with m < 0, is the area bounded by the lines y = x, y = mx and x = 2 equal to 3 ?

  1. -\frac{1}{2}

  2. -1

  3. -\frac{3}{2}

  4. -2

  1. a

  2. b

  3. c

  4. d

A solution of the differential equation

(dy/dx)2  - x dy/dx=0 is

  1. y = 2x

  2. y = 2x+4

  3. y = 2x-1

  4. y = x2-2)/2

If f'(x) = x2 + 2 and g(x) = 2x - 3, then what is (fg)(1) equal to ?

  1. 3

  2. 1

  3. -2

  4. -3

What is the range of the function f(x)=x +lxl if the domain is the set of real numbers ?

  1. (0, oo)
     

  2. [0, oo)

  3. (- co, co)

  4. (1, co)

If f'(x) =x(4x2 - 3 ), then what is /(sinθ) equal to ?

  1. - sin3θ
  2. - cos3θ

  3. sin3θ

  4. - sin4θ

What is lim \frac{5-x}{x \to 5(x-5)}

equal to 

  1. -1

  2. 0

  3. 1

  4. Limit does not exist

What is lim \frac{x9-1}{x \to1x3-1} equal to

  1. -1

  2. -3

  3. 3

  4. Limit does not exist

The mean and variance of five obser­ vations are 14 and 13.2 respectively. Three of the five observations are 11, 16 and 20. What are the other two observations ?

  1. 8 and 15

  2. 9 and 14

  3. 10 and 13

  4. 11  and 12

Let A and B be two independent events such that 

P(A) = 0.7, P(B) = k, P(AUB) = 0.8. 

What is the value of k ?

  1. \frac{5}{7}

  2. \frac{4}{7}

  3. \frac{2}{7}

  4. \frac{1}{7}

A biased coin with the probability of getting head equal to ¼ is tossed five times. What is the probability of getting tail in all the first four tosses followed by head ?

  1. \frac{81}{512}

  2. \frac{81}{1024}

  3. \frac{81}{256}

  4. \frac{27}{1024}

A coin is bised so that heads comes up thrice as likely as tails. In four independent tosses of coin, what is probability of getting exactly three heads?

  1. \frac{81}{256}

  2. \frac{27}{64}

  3. \frac{27}{256}

  4. \frac{9}{256}

If X and Y be two random variables such that X + Y = 100. If X follows Binomial distribution with parameters n = 100 and  p = 4/5, what is the variance of Y?

  1. 1

  2. \frac{1}{2}

  3. 16

  4. \frac{1}{16

If  two   lines    of    regression    are x + 4y + 1 = 0 and 4x + 9y + 7 = 0, then what is the value of x when y=-3?

  1. -13

  2. -5

  3. 5

  4. 7

The central  angles  p,  q,  r  and  s  (in degrees)  of  four  sectors   in   a Pie Chart satisfy the relation 9p = 3q = 2r =6s. What is the value of 4p - q ?

  1. 12

  2. 24

  3. 30

  4. 36

The observations 4, 1, 4, 3, 6,  2, 1, 3, 4, 5, 1, 6 are outputs of 12 dices thrown simultaneously. If m and M are means of lowest 8 observations and highest 4 observations respectively, then what is (2m + M) equal to ?

  1. 10

  2. 12

  3. 17

  4. 21

A bivariate data set contains only two points (-1, 1) and (3, 2). What will be the line of regression of y on x ?

  1. x-4y+5=0

  2. 3x + 2y - I = 0 

  3. x + 4y + 1 = 0 

  4. 5x - 4y + 1 = 0

A die is thrown 10 times and obtained the following outputs :

1, 2, 1, 1, 2, 1, 4, 6, 5, 4

What will be the mode of data so obtained?

  1. 6

  2. 4

  3. 2

  4. 1

Waht is following frequency distribution : 

x

1

2

3

5

f'

4

6

9

7

What is the value of median of the distribution ?

  1. 1

  2. 2

  3. 3

  4. 3.5

For data -1, I, 4, 3, 8, 12, 17, 19, 9,

11; if M is the median of first 5 observations and N is the median of last five observations, then  what  is the value of 4M - N?

  1. 7

  2. 4

  3. 1

  4. 0

Let P, Q, R represent mean median and mode. If for some distribution 5P = 4Q   = R/2, then what is P+Q/2P+0.7R equal to?

  1. \frac{1}{12}

  2. \frac{1}{7}

  3. \frac{2}{9}

  4. \frac{1}{4}

  1. a

  2. b

  3. c

  4. d

  1. a

  2. b

  3. c

  4. d

  1. a

  2. b

  3. c

  4. d

One bag contains 3 white and 2 black balls, another bag contains 2  white and 3 black balls. Two balls  are drawn from the first bag and put  it  into the second bag and then a ball is drawn from the second bag. What is the probability that it is white ?

  1. \frac{6}{7}

  2. \frac{33}{70}

  3. \frac{3}{10}

  4. \frac{1}{70}

Three dice are thrown. What is the probability that each face shows only multiples of 3 ?

  1. \frac{1}{9}

  2. \frac{1}{18}

  3. \frac{1}{27}

  4. \frac{1}{3}

What is the probability that the month of December has 5 Sundays ?

  1. 1

  2. \frac{1}{4}

  3. \frac{3}{7}

  4. \frac{2}{7}

A natural number n is choosen from the first 50 natural numbers. What is the probability that n + 50/n < 50 ?  

  1. \frac{23}{25}

  2. \frac{47}{50}

  3. \frac{24}{25}

  4. \frac{49}{50}

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