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926

Solve  

Solve  

IIT 1996
927

Let y′(x) + y(x) g′(x) = g(x) g′(x), y(0) = 0, x ∈ ℝ where f′(x) denotes ddxf(x)

and g(x) is a given non constant differentiable function on ℝ with g(0) = g(2) = 0. Then the value of y(2) is

a) 1

b) 0

c) 2

d) 4

Let y′(x) + y(x) g′(x) = g(x) g′(x), y(0) = 0, x ∈ ℝ where f′(x) denotes ddxf(x)

and g(x) is a given non constant differentiable function on ℝ with g(0) = g(2) = 0. Then the value of y(2) is

a) 1

b) 0

c) 2

d) 4

IIT 2011
928

One or more than one correct option

A solution curve of the differential equation (x2+xy+4x+2y+4)dydxy2=0,x>0

passes through the point (1, 3), then the solution curve

a) Intersects y = x + 2 exactly at one point

b) Intersects y = x + 2 exactly at two points

c) Intersects y = (x + 2)2

d) Does not intersect y = (x + 3)2

One or more than one correct option

A solution curve of the differential equation (x2+xy+4x+2y+4)dydxy2=0,x>0

passes through the point (1, 3), then the solution curve

a) Intersects y = x + 2 exactly at one point

b) Intersects y = x + 2 exactly at two points

c) Intersects y = (x + 2)2

d) Does not intersect y = (x + 3)2

IIT 2016
929

The value of

a) –1

b) 0

c) 1

d) i

e) None of these

The value of

a) –1

b) 0

c) 1

d) i

e) None of these

IIT 1987
930

Let U1 = 1, U2 = 1, Un + 2 = Un + 1 + Un, n > 1. Use mathematical induction to show that
 
for all integers n > 1

Let U1 = 1, U2 = 1, Un + 2 = Un + 1 + Un, n > 1. Use mathematical induction to show that
 
for all integers n > 1

IIT 1981
931

Let f(x) = (1 – x)2 sin2x + x2Consider the statementsStatement 1: There exists some x ∈ ℝ such that f(x) + 2x = 2(1 + x2)Statement 2: There exists some x ∈ ℝ such that 2f(x) + 1 = 2x(x + 1)

a) Both 1 and 2 are true

b) 1 is true and 2 is false

c) 1 is false and 2 is true

d) Both 1 and 2 are false

Let f(x) = (1 – x)2 sin2x + x2Consider the statementsStatement 1: There exists some x ∈ ℝ such that f(x) + 2x = 2(1 + x2)Statement 2: There exists some x ∈ ℝ such that 2f(x) + 1 = 2x(x + 1)

a) Both 1 and 2 are true

b) 1 is true and 2 is false

c) 1 is false and 2 is true

d) Both 1 and 2 are false

IIT 2013
932

Let z and ω be two complex numbers such that |z| ≤ 1, |ω| ≤ 1 and   then z equals

a) 1 or i

b) i or –i

c) 1 or –1

d) i or –1

Let z and ω be two complex numbers such that |z| ≤ 1, |ω| ≤ 1 and   then z equals

a) 1 or i

b) i or –i

c) 1 or –1

d) i or –1

IIT 1995
933

Given
 
 
Prove that
 

Given
 
 
Prove that
 

IIT 1984
934

The coordinates of the in centre of the triangle that has the co ordinates of the mid points of its sides as (0, 1), (1, 1) and (1, 0) is

a) 2+2

b) 22

c) 1+2

d) 12

The coordinates of the in centre of the triangle that has the co ordinates of the mid points of its sides as (0, 1), (1, 1) and (1, 0) is

a) 2+2

b) 22

c) 1+2

d) 12

IIT 2013
935

Using mathematical induction, prove that

 for n > 1

Using mathematical induction, prove that

 for n > 1

IIT 1986
936

If f(x) =  then on the interval [0, π]

a) tan  and  are both continuous

b) tan  and  are both discontinuous

c) tan  and  are both continuous

d) tan  is continuous but  is not

If f(x) =  then on the interval [0, π]

a) tan  and  are both continuous

b) tan  and  are both discontinuous

c) tan  and  are both continuous

d) tan  is continuous but  is not

IIT 1989
937

One or more than one correct option

A ray of light along x+3y=3

gets reflected upon reaching X- axis, the equation of the reflected ray is

a) y=x+3

b) 3y=x3

c) y=3x3

d) 3y=x1

One or more than one correct option

A ray of light along x+3y=3

gets reflected upon reaching X- axis, the equation of the reflected ray is

a) y=x+3

b) 3y=x3

c) y=3x3

d) 3y=x1

IIT 2013
938

If  and  where 0 < x ≤1, then in this interval

a) Both f (x) and g (x) are increasing functions

b) Both f (x) and g (x) are decreasing functions

c) f (x) is an increasing function

d) g (x) is an increasing function

If  and  where 0 < x ≤1, then in this interval

a) Both f (x) and g (x) are increasing functions

b) Both f (x) and g (x) are decreasing functions

c) f (x) is an increasing function

d) g (x) is an increasing function

IIT 1997
939

The number of common tangents to the circles x2 + y2 – 4x − 6y – 12 = 0 and x2 + y2 + 6x + 18y + 26 = 0 is

a) 1

b) 2

c) 3

d) 4

The number of common tangents to the circles x2 + y2 – 4x − 6y – 12 = 0 and x2 + y2 + 6x + 18y + 26 = 0 is

a) 1

b) 2

c) 3

d) 4

IIT 2015
940

Let p ≥ 3 be an integer and α, β be the roots of x2 – (p + 1) x + 1 = 0. Using mathematical induction show that αn + βn
i) is an integer
ii) and is not divisible by p.

Let p ≥ 3 be an integer and α, β be the roots of x2 – (p + 1) x + 1 = 0. Using mathematical induction show that αn + βn
i) is an integer
ii) and is not divisible by p.

IIT 1992
941

The function  is not differentiable at

a) – 1

b) 0

c) 1

d) 2

The function  is not differentiable at

a) – 1

b) 0

c) 1

d) 2

IIT 1999
942

One or more than one correct option

Let RS be a diameter of the circle x2 + y2 = 1 where S is the point (1, 0). Let P be a variable point (other than R and S) on the circle and the tangents to the circle at S and P meet at the point Q. The normal to the circle at P intersect a line drawn through Q parallel to RS at a point E. Then the locus of E passes through the point(s)

a) (13,13)

b) (14,12)

c) (13,13)

d) (14,12)

One or more than one correct option

Let RS be a diameter of the circle x2 + y2 = 1 where S is the point (1, 0). Let P be a variable point (other than R and S) on the circle and the tangents to the circle at S and P meet at the point Q. The normal to the circle at P intersect a line drawn through Q parallel to RS at a point E. Then the locus of E passes through the point(s)

a) (13,13)

b) (14,12)

c) (13,13)

d) (14,12)

IIT 2016
943

If x is not an integral multiple of 2π use mathematical induction to prove that
 

If x is not an integral multiple of 2π use mathematical induction to prove that
 

IIT 1994
944

A circle passing through (1, −2) and touching the axis of X at (3, 0) also passes through the point

a) (−5, 2)

b) (2, −5)

c) (5, −2)

d) (−2, 5)

A circle passing through (1, −2) and touching the axis of X at (3, 0) also passes through the point

a) (−5, 2)

b) (2, −5)

c) (5, −2)

d) (−2, 5)

IIT 2013
945

The circles  and  intersect each other in distinct points if

a) r < 2

b) r > 8

c) 2 < r < 8

d) 2 ≤ r ≤ 8

The circles  and  intersect each other in distinct points if

a) r < 2

b) r > 8

c) 2 < r < 8

d) 2 ≤ r ≤ 8

IIT 1994
946

Prove by induction that
Pn = Aαn + Bβn for all n ≥ 1
Where α and β are roots of the quadratic equation
x2 – (1 – P) x – P (1 – P) = 0,
P1 = 1, P2 = 1 – P2, .  .  .,
Pn = (1 – P) Pn – 1 + P (1 – P) Pn – 2  n ≥ 3,
and ,

Prove by induction that
Pn = Aαn + Bβn for all n ≥ 1
Where α and β are roots of the quadratic equation
x2 – (1 – P) x – P (1 – P) = 0,
P1 = 1, P2 = 1 – P2, .  .  .,
Pn = (1 – P) Pn – 1 + P (1 – P) Pn – 2  n ≥ 3,
and ,

IIT 2000
947

Let P be a point on the parabola y2 = 8x which is at a minimum distance from the centre C of the circle x2 + (y + 6)2 = 1. Then the equation of the circle passing through C and having its centre at P is

a) x2 + y2 – 4x + 8y + 12 = 0

b) x2 + y2 –x + 4y − 12 = 0

c) x2 + y2 –x + 2y − 24 = 0

d) x2 + y2 – 4x + 9y + 18 = 0

Let P be a point on the parabola y2 = 8x which is at a minimum distance from the centre C of the circle x2 + (y + 6)2 = 1. Then the equation of the circle passing through C and having its centre at P is

a) x2 + y2 – 4x + 8y + 12 = 0

b) x2 + y2 –x + 4y − 12 = 0

c) x2 + y2 –x + 2y − 24 = 0

d) x2 + y2 – 4x + 9y + 18 = 0

IIT 2016
948

Let  then points where f (x) is not differentiable is (are)

a) 0

b) 1

c) ± 1

d) 0, ± 1

Let  then points where f (x) is not differentiable is (are)

a) 0

b) 1

c) ± 1

d) 0, ± 1

IIT 2005
949

The slope of the line touching both parabolas y2 = 4x and x2 = −32y is

a) 12

b) 32

c) 18

d) 23

The slope of the line touching both parabolas y2 = 4x and x2 = −32y is

a) 12

b) 32

c) 18

d) 23

IIT 2014
950

Let PQ and RS be tangents at the extremities of the diameter PR of a circle of radius r. If PS and QR intersect at a point x on the circumference of the circle, then 2r equals

a)

b)

c)

d)

Let PQ and RS be tangents at the extremities of the diameter PR of a circle of radius r. If PS and QR intersect at a point x on the circumference of the circle, then 2r equals

a)

b)

c)

d)

IIT 2001

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