WBJEE Previous Year - 2011


240 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests | WBJEE Previous Year - 2011


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Attempt WBJEE Previous Year - 2011 | 240 questions in 300 minutes | Mock test for JEE preparation | Free important questions MCQ to study WBJEE Sample Papers, Section Wise & Full Mock Tests for JEE Exam | Download free PDF with solutions
QUESTION: 1

The eccentricity of the hyperbola  4x2 – 9y2 = 36 is

Solution:

QUESTION: 2

The length of the latus rectum of the ellipse 16x2 + 25y2 = 400 is

Solution:

QUESTION: 3

The vertex of  the parabola  y2 + 6x – 2y + 13 = 0 is

( y −1)2= −6x − 12

( y −1)2= −6(x +12) = 4(-6/4)(x+2)

Vertex →(−2, 1)

Solution:
QUESTION: 4

The coordinates of a moving point p are (2t2 + 4, 4t + 6). Then  its locus will be a

Solution:

QUESTION: 5

The equation  8x2 + 12y2 – 4x + 4y – 1 = 0  represents

Solution:

ax2 + by2+ 2hxy + 2gx + 2fy + c = 0

represents ellipse if h2 −ab< 0

3x2 + 12y2− 4x + 4y − 1 = 0

h =0, a= 3, b = 12

h2 −ab< 0

QUESTION: 6

If the straight line  y = mx lies outside of the circle x2 + y2 – 20y + 90 = 0, then the value of  m will satisfy

Solution:

x2 +m2 x2− 20mx + 90

x2 (1 + m2)− 20mx + 90 = 0

D <0

400m2 − 4× 90 (1 + m2) < 0

40m2 < 360

m2 < 9  ; |m |< 3

QUESTION: 7

The locus of the centre of a circle which passes through two variable points (a, 0), (–a, 0) is

Solution:

Centre lies on y-axis  locus  x = 0

QUESTION: 8

The  coordinates of the two points lying on  x + y = 4 and at a unit distance from the straight line 4x + 3y = 10 are

Solution:

Let  p (h, 4 − h)

|h + 2|= 5

h =3,−7 ;  p =1, 1

(3,1),(−7,11)

QUESTION: 9

The intercept on the line y = x by the circle x2 + y2 – 2x = 0 is  AB.  Equation of the circle with AB as diameter is

Solution:

x2 + y2 = 0

( 0, 0 ) , (1,1) as diametric ends (x − 0)(x−1) + (y + 0)(y −1) = 0

x2 +y2− x − y = 0

QUESTION: 10

If the coordinates of one end of a diameter of the circle  x2+y2+4x–8y+5=0, is (2,1), the coordinates of the other end is

Solution:

x2 + y2+ 9x − 8y + 5 = 0

Centre circle (–2, 4)

QUESTION: 11

If the three points A(1,6), B(3, –4) and C(x, y) are collinear then the equation satisfying by  x and y is

Solution:

⇒ 1(3y+ 4x) − (y − 6x) +1(−4 −18) = 0

⇒ 3y+ 4x − y + 6x −12 = 0

⇒ 2y+ 10x − 22 = 0

y +5x= 11

QUESTION: 12

and θ lies in the second quadrant, then cosθ is equal to

Solution:

θ in 2nd quad Cosθ < 0

QUESTION: 13

The solutions set of  inequation  cos–1x < sin–1x is

Solution:

cos–1x < sin–1

QUESTION: 14

The number of solutions of  2sinx + cos x = 3 is

Solution:

√5 <3      No solution

QUESTION: 15

Solution:

 

QUESTION: 16

If  θ+ φ = π/4 then (1 + tanθ)(1 + tanφ)  is equal to

Solution:

QUESTION: 17

If sinθ and cosθ are the roots of the equation  ax2 – bx + c = 0, then a, b and c satisfy the relation

Solution:

 sinθ + cosθ = b/a

 sinθ . cosθ = c/a

QUESTION: 18

If  A and B are two matrices such that A+B and AB are both defined, then

Solution:

 Addition is defined if order of A is  equal to order of B

AB is defined if  m  = n

nxm nxm 

⇒ A, B are square matrices of same order

QUESTION: 19

  is a symmetric matrix, then the value of  x is

Solution:

A = AT

QUESTION: 20

Solution:

= -(-21-64)-((1-2i)(7(1+2i)+5i(5-3i)))+5i(1+2i)(5+3i)-15i)

= Real

QUESTION: 21

The equation of the locus of the point of intersection of the straight lines x sin θ + (1 – cos θ) y = a sin θ  and x sin θ – (1 + cos θ) y + a sin θ = 0 is

Solution:

y =  a sin θ

x = a cos θ.

x2 + y2= a2

QUESTION: 22

If sinθ + cosθ = 0 and 0 < θ < π, then θ

Solution:
QUESTION: 23

The value of cos 15o – sin 15o is

Solution:

QUESTION: 24

he period of the function f(x) = cos 4x + tan 3x is

Solution:

QUESTION: 25

If y = 2x3 – 2x2 + 3x – 5, then for x = 2 and Δ x = 0.1 value of  Δ y is

Solution:

QUESTION: 26

The approximate value of 5√33 correct to 4 decimal places is

Solution:

QUESTION: 27

The value of  2-2  xcos + xsinx + 1

Solution:

QUESTION: 28

For the function f(x) = ecos x , Rolle’s theorem is

Solution:

QUESTION: 29

The general solution of the differential equation 

Solution:

QUESTION: 30

Solution:

QUESTION: 31

Solution:

QUESTION: 32

Solution:

QUESTION: 33

 The degree and order of the differential equation     are repectively

Solution:

QUESTION: 34

Solution:

QUESTION: 35

The function f(x) = ax + b is strictly increasing for all real x if

Solution:

 f′ (x) = a f′(x) > 0   ⇒ a > 0

QUESTION: 36

Solution:

QUESTION: 37

Solution:

QUESTION: 38

The general solution of the differential equation 

Solution:

QUESTION: 39

Solution:

QUESTION: 40

Solution:

C2 → C2 – C3

C3 → C3 + C2

C3 → C3 + ωC1

C2 → C2 – C1

QUESTION: 41

4 boys and 2 girls occupy seats in a row at random. Then the probability that the two girls occupy seats side by side is

Solution:

QUESTION: 42

A coin is tossed again and again. If tail appears on first three tosses, then the chance that head appears on fourth toss is

Solution:

p = 1.1.1.1/2 = 1/2

QUESTION: 43

The coefficient of xn in the expansion of 

Solution:

QUESTION: 44

The sum of the series 

Solution:

QUESTION: 45

The number (101)100– 1 is divisible by

Solution:

QUESTION: 46

If A and B are coefficients of xn in the expansions of (1+ x)2n and (1+x)2n – 1 respectively, then A/B is equal to

Solution:

A = 2nCn  

B = 2n – 1Cn

QUESTION: 47

If n > 1 is an integer and x ≠0, then (1 + x)n – nx – 1is divisible by

Solution:

(1 + x)n = nC0 + nC1x + nC2x² + nC3x3 + .......              

= 1 + nx + x² (nC2 + nC3 x + .........)  (1 + x)n – nx – 1

= x² (nC2+ nC3x + ........)

QUESTION: 48

If  nC4, nC5 and nC6  are in A.P., then n is

Solution:

nC4, nC5 and nC6

QUESTION: 49

The number of diagonals in a polygon is 20. The number of sides of the polygon is

Solution:

nC2 –n = 20  

n = 8

QUESTION: 50

Solution:

QUESTION: 51

Let a , b, c be three real numbers such that a + 2b + 4c = 0. Then the equation ax2 + bx + c = 0

Solution:

QUESTION: 52

If the ratio of the roots of the equation px2 + qx + r = 0 is a : b, then ab/(a + b)is

Solution:

QUESTION: 53

If α and β are the roots of the equation x2 + x + 1 = 0, then the equation whose roots are α19 and β7 is

Solution:

 α  and β are the roots of x2 + x + 1 = 0

α = ω

β=ω2 

α19 = ω

β7 = ω2

x2 – (α19 + β7)x + α19 β7 = 0

Thou, x2 – (ω + ω 2) x + ω . ω 2 = 0

x2 + x + 1 = 0

QUESTION: 54

For the real parameter t, the locus of the complex number z = (1 – t²) + i√(1 + t2) in the complex plane is

Solution:

 Let z = x + iy  

x = 1 – t2 

y2 = 1 + t2

Thus, x + y2 = 2          

y2 = 2 – x        

y2 = – (x – 2)    

Thus  parabola

QUESTION: 55

if x + 1/x = 2cosθ, then for any integer n , xn + 1/xn

Solution:

x + 1/x = 2cosθ

Let x = cos θ + 1 sin θ

1/x = cosθ − 1sinθ

thus, xn + 1/xn = 2 cos nθ

QUESTION: 56

If ω ≠ 1 is a cube root of unity, then the sum of the series S = 1 + 2ω + 3ω ² + .......... + 3nω 3n – 1 is

Solution:

S = 1 + 2ω + 3ω ² + .......... + 3nω 3n – 1

Sω = ω + ω ² + .......... + (3n-1)ω 3n – 1 + 3nωn

s(1 – ω) = 1 + ω + ω² + ...........+ ω3n–1 – 3nω3h

 = 0 – 3n

QUESTION: 57

If log3x + log3y = 2 + log32 and log3(x + y) = 2, then

Solution:

log3x + log3y = 2 + log32

⇒ x.y = 18  log (x + y) = 2  

⇒  x + y = 9

we will get x = 3 and y = 6

QUESTION: 58

If log 7 2 = λ, then the value of log49 (28) is

Solution:

  log4928 = log724 × 7

QUESTION: 59

The sequence log a, log a2/b, loga3/b2,  ....... is

Solution:

log a . (2log a – log b)(3log a – 2 log b)

 = T2 – T1 = log a – log b

= T3– T2 = log a – log b

QUESTION: 60

If in a triangle ABC, sin A, sin B, sin C are in A.P., then

Solution:

QUESTION: 61

Solution:

 c1 → c1 + c2 + c3

QUESTION: 62

The area enclosed between y2 = x and y = x is

Solution:

QUESTION: 63

Let f(x) = x3e–3x, x  > 0. Then the maximum value of f(x) is

Solution:

f(x) = x3e–3x

= f′(x) = 3x2e–3x + x3 e–3x (–3)

= x23e–3x[1 – x] = 0, x = 1

Maximum at x = 1

f(1) = e–3

QUESTION: 64

The area bounded by y2 = 4x and x2 = 4y is

Solution:

QUESTION: 65

The acceleration of a particle starting from rest moving in a straight line with uniform acceleration is 8m/sec2. The time taken by the particle to move the second metre is

Solution:

QUESTION: 66

The solution of

Solution:

QUESTION: 67

Integrating Factor (I.F.) of the defferential equation

Solution:

QUESTION: 68

The differential equation of y = aebx (a & b are parameters) is

Solution:

y = a.ebx ............ (i)

y1 = abebx

y1 = by............(ii)

y2 = by1 ...........(iii)

QUESTION: 69

The value of

Solution:

QUESTION: 70

Solution:

QUESTION: 71

∫ 2x (f ′(x) + f (x) log 2)dx is

Solution:

I = ∫ 2x f ′(x)dx+∫ 2x f (x) log 2dx

= 2xf(x)

QUESTION: 72

Let f(x) = tan–1x. Then f′(x) + f′′(x) is = 0, when x is equal to

Solution:

f(x) = tan–1x

QUESTION: 73

Solution:

QUESTION: 74

Solution:

QUESTION: 75

Solution:

QUESTION: 76

If the function

Solution:

QUESTION: 77

if f(x) is continuous at x = 2, the value of λ will be

Solution:

QUESTION: 78

The even function of the following is

Solution:

QUESTION: 79

If f(x + 2y, x – 2y) = xy, then f(x, y) is equal to

Solution:

QUESTION: 80

The locus of the middle points of all chords of the parabola y2 = 4ax passing through the vertex is

Solution:

2h = x,  2k = y

y2 = 4ax

k2 = 2ah

y2 = 2ax

QUESTION: 81

The charge on the capacitor of capacitance  C  shown in the figure below will be

 

Solution:

∴ Potential difference  across R2 ,

∴ Charge on the capacitor 

QUESTION: 82

The resistance across  A  and B  in the figure below will be

Solution:

Resistance are in parallel  = R/3

QUESTION: 83

Five equal resistance, each of resistance  R, are connected as shown in figure below. A battery of V volt is connected between A and B. The current flowing in FC will be

Solution:

QUESTION: 84

Two cells with the same e.m.f.  E and different internal resistances  r1 and r2  are connected in series to an external resistance R. The value of R so that the potential difference across the first cell be zero is

Solution:

QUESTION: 85

Current through ABC and A'B'C'  is  I. What is the magnetic field at P? BP = PB' = r (Here C'B' PBC  are collinear)

Solution:

QUESTION: 86

The magnetic field at the point of intersection of diagonals of a square wire loop of side  L carrying a current  I  is

Solution:

QUESTION: 87

In an inelastic collision an electron excites as hydrogen atom from its ground state to a M-shell state. A second electron collides instantaneously with the excited hydrogen atom in the M-State and ionizes it. At least how much energy the second electron transfers to the atom in the M-state?

Solution:

Minimum energy required by electron should be  +1.51 eV

QUESTION: 88

A radioactive nucleus of mass number  A, initially at rest, emits an α-particle with a speed ν . The recoil speed of the daughter nucleus will be

Solution:

 From conservation of  momentum   

QUESTION: 89

In the nuclear reaction

Solution:
QUESTION: 90

Which type of Gate the following truth table represents?

Solution:

QUESTION: 91

Given A =2iˆ+ 3ˆj and B = ˆi+ˆj. The component of vector A along vector B is

Solution:

QUESTION: 92

A cubical vessel of height 1 m is full of water. What is the amount of work done in pumping water out of the vessel? (Take  g = 10 m s–2)

Solution:

V = l3=1m3

m = 1 x 1000 = 1000kg

w = mgh = 1000 x 10 x 1/2= 5000J

QUESTION: 93

A stone of relative density  K is released from rest on the surface of a lake. If viscous effects are ignored, the stone sinks in water with an acceleration of

Solution:

QUESTION: 94

If a person can throw a stone to maximum height of  h  metre vertically, then the maximum distance through which it can be thrown horizontally by the same person is

Solution:

QUESTION: 95

A body of mass 6 kg is acted upon by a force which causes a displacement in it given x = t2/4 metre where   t  is the time in second. The work done by the force in 2 seconds is

Solution:

QUESTION: 96

A box is moved along a straight line by a machine delivering constant power. The distance moved by the body in time  t  is proportional to

Solution:

QUESTION: 97

A particle is moving with a constant speed  ν in a circle. What is the magnitude of average velocity after half rotation?

Solution:

QUESTION: 98

A cricket ball of mass 0.25 kg with speed 10 m/s collides with a bat and returns with same  speed within 0.01 S. The force acted on bat is

Solution:

QUESTION: 99

If the Earth were to suddenly contract to 1/n th of its present radius without any change in its mass, the duration of the new day will be nearly

Solution:

I1ω1=I 2 ω 2

QUESTION: 100

If  g  is the acceleration due to gravity on the surface of the earth, the gain in potential energy of an object of mass  m  raised from the earth’s surface to a height equal to the radius  R  of the earth is

Solution:

QUESTION: 101

A material has Poisson’s ratio 0.50. If a uniform rod of it suffers a longitudinal strain of 2 × 10–3, then the percentage change in volume is

Solution:
QUESTION: 102

Two identical springs are connected to mass m as shown (k = spring constant). If the period of the configuration in (a) is 2S, the period of the configuration (b) is

Solution:

T =  1S

QUESTION: 103

An object weighs m1 in a liquid of density d1 and that in liquid of density d2 is m2. The density d of the object is

Solution:

V(d – d1)g = m1g

V(d – d2)g = m2g

QUESTION: 104

A body floats in water with 40% of its volume outside water. When the same body floats in an oil, 60% of its volume remains outside oil. The relative density of oil is

Solution:

Vσg = 0.6 Vσ1g ...... (1)

Vσg = 0.4 Vσ2g  .................. (2)

Dividing (1) and (2) 

= 3/2

QUESTION: 105

Two soap bubbles of radii x and y coalesee to constitute a bubble of radius z. Then z is requal to

Solution:

n = n1 + n2

pv = p1v1 + p2v2

 

QUESTION: 106

A particle of mass m is located in a one dimensional potential field where potential energy is given by : V(x) = A(1 – cos px), where A and p are constants. The period of small oscillations of the particle is

Solution:

v x =A(1− cos px )

QUESTION: 107

The period of oscillation of a simple pendulum of length l suspended from the roof  of a vehicle, which moves without friction down an inclined plane of inclination α, is given by

Solution:

QUESTION: 108

In Young’s double slit experiment the two slits are d distance apart. Interference pattern is observed on a screen at a distance D from the slits. A dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of light is

Solution:

QUESTION: 109

A plane progressive wave is given by y = 2 cos 6.284 (330 t – x). What is period of the wave ?

Solution:

y = 2 cos 2π (330 t – x)

ω = 2π × 330

T = 1/330 S

QUESTION: 110

The displacement of a particle in S.H.M. varies according to the relation x = 4(cos πt + sin πt). The amplitude of the particle is

Solution:

R sin δ = 4

R cos δ = 4

R = 4√2

QUESTION: 111

Two temperature scales A and B are related by   At which temperature two scales have the same reading ?

Solution:

, A = B
2A – 84 = A – 72
A = 12

QUESTION: 112

An ideal gas is compressed isothermally until its pressure is doubled and then allowed to expand adiabatically to regain its original volume (γ = 1.4 and 2-14= 0.38). The ratio of the final to initial pressure is

Solution:

QUESTION: 113

Air inside a closed container is saturated with water vapour. The air pressure is p and the saturated vapour pressure of water is p- . If the mixture is compressed to one half of its volume by maintaining temperature constant, the pressure becomes

Solution:
QUESTION: 114

1.56 × 105 J of heat is conducted through a 2 m2 wall of 12 cm thick in one hour. Temperature difference between the two sides of the wall is 200C. The thermal conductivity of the material of the wall is (in W m–1 K–1)

Solution:

QUESTION: 115

A diver at a depth of 12 m in water ( μ = 4/3) sees the sky in a cone of semivertical angle :

Solution:

sin-1(4/3)

QUESTION: 116

Two thin lenses of focal lengths 20 cm and 25 cm are placed in cotact. The effective power of the combination is

Solution:

P = P1 + P2

QUESTION: 117

A convex lens of focal length 30 cm produces 5 times magnified real image of an object. What is the object distance ?

Solution:

QUESTION: 118

If the focal length of the eye piece of a telescope is doubled, its magnifying power (m) will be

Solution:

m = -f0/fe

m' = m/2

QUESTION: 119

A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens ?

Solution:

QUESTION: 120

Four charges equal to –Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium, the value of q is

Solution:

QUESTION: 121

Two aromatic compounds having formula C7H8O which are easily identifiable by FeCl3 solution test (violet colouration) are

Solution:

O – cresol contains phenolic group, thus it gives violet coloration with FeCl3  where as benzylalchol donot contains phenolic group, hence no coloration with FeCl3. Hence Identifiable

QUESTION: 122

The ease of dehydrohalogenation of alkyl halide with alcoholic KOH is

Solution:

Such dehydrohalogenation follows E2 mechanism. The driving force of such reactions is the stability of alkene produced. Since tetriary alkyl halide can give more substituted alkene, it reacts fastest followed by secondary and primary i.e. 3o > 2o > 1o.

QUESTION: 123

The ease of Nitration of the following three hydrocarbons follows the order

Solution:
QUESTION: 124

The correct order of decreasing acidity of nitrophenols will be

Solution:

Due to – I and – R influence,  NO2 in ortho-postion should have raised the acidity to the maximum extent. But it is due to intramolecular H – bonding, ortho-nitrophenol is less acidic than para – nitrophenol.

QUESTION: 125

Among the alkenes which one produces tertiary bytyl alcohol on acid hydration

Solution:

QUESTION: 126

Which of the following compounds has maximum volatility?

A. 

B. 

C. 

D. 

Solution:

Due to intramolecular H – bonding

QUESTION: 127

Which one of the following will show optical isomerism?

Solution:

The central carbon is attached to four different substituents, hence it is chiral carbon, therefore optically active.

QUESTION: 128

The pH of an aqueous solution of CH3COONa of concentrated C(M) is given by

Solution:

In case of Hydrolysis of salt of weak acid and strong base, the pH is given by

QUESTION: 129

The standard reduction potential Eo for half reations are

Zn = Zn+2 + Ze Eo = +0.76 V

Fe = Fe+2 + Ze Eo = + 0.41 V

The EMF of hte cell reaction

Fe+2 + Zn =  Zn+2  + Fe

Solution:
QUESTION: 130

If the equilibrium constants of the following equilibria

are given by K1 and K2 respectively, which of the following relations is correct

Solution:

QUESTION: 131

The energy of an electron in first Bohr orbit of H – atom is – 13.6 eV. The possible energy value of electron in the excited state of Li2+ is

Solution:

For the excited state, n = 2 and for Li++ ion, z = 3

QUESTION: 132

The amount of the heat released when 20 ml 0.5 M NaOH is mixed with 100 ml 0.1 M HCl is x kJ. The heat of neutralization is

Solution:

During formation of 10 millimole of H2O the heat released is x KJ. Therefore heat of neutralisation is – 100 x KJ/mol (heat released hence negative)

QUESTION: 133

Which one of the following has the lowest ionization energy?

Solution:

It’s an alkalimetal; hence least I.P

QUESTION: 134

The ozone layer forms naturally by

Solution:

QUESTION: 135

2 gm of metal carbonate is neutralized completely by 100 ml of 0.1 (N) HCl. The equivalent weight of metal carbonate is

Solution:

 Number of gram equivalents of HCl = 100 x 0.1/1000 = 0.01

Number of gram equivalents of metal carbonate required for neutralisation must also be 0.01. Thus, mass of 1 gram eqivalent of carbonate salt 2/0.01= 200g

QUESTION: 136

Which one of the following is not true at room temperature and pressure

Solution:

SO3 is a colourless gas, crystalline transparent solid at room temperature.

QUESTION: 137

An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point 6.0) glutamic acid (3.2) and arginine (10.7) buffered at pH 6. What is the fate of the three acids?

Solution:

At pH = 6, glutamic acid exists as a dianionic species & migrates to anode while arginine exists as cationic species & moves to cathode. Alanine does not migrate to any electrode at its isoelectric point .

QUESTION: 138

The representation of the ground state electronic configuration of He by box – diagram as ↑↑ is wrong because it violates

Solution:

According to Pauli Exclusion Principle, In any orbital, maximum two electrons can exist, having opposite spin.

QUESTION: 139

The electronic transitions from n = 2 to n = 1 will produce shortest wavelength in (where n = principal quantum state)

Solution:

Hence, for shortest λ, z must be maximum, which is for Li+2.

QUESTION: 140

 In the following electron – dot structure, calculate the formal charge from left to right nitrogen atom;

Solution:

Formal chargl = Number of electrons in

Valence shell –(1/2) x numbers of electrons as bond pair + numbers of electrons as lone pair)

QUESTION: 141

If the molecular wt. of Na2S2O3 and I2 are M1 and M2 respectively, then what will be the equivalent wt. of Na2S2Oand I2 in the following reaction?

Solution:

QUESTION: 142

A radioactive atom yxM emits two α particles and one β particle successively. The number of neutrons in the nucleus of the product will be

Solution:

Number of neutrons  

= Mass no. – Atomic no.

= X – 8 – Y + 3
= X – Y – 5

QUESTION: 143

An element belongs to Group 15 and third period of the periodic table. Its electonic configuration will be

Solution:

General valence shell electronic configuration of 15 group elements is ns2np3. where n = period number.

QUESTION: 144

Which one of the following is paramagnetic?

Solution:

QUESTION: 145

Platinum, Palladium and Iridium are called noble metals because

Solution:
QUESTION: 146

Which one is not a constituent of nucleic acid?

Solution:

 Guanine is the constituent of nucleic acid and not guanidine.

QUESTION: 147

The sp3d2 hybridization of central atom of a molecule would lead to

Solution:
QUESTION: 148

In aqueous solution glucose remains as

Solution:

QUESTION: 149

Which of the following is used to prepare Cl2 gas at room temperature from concentrated HCl?

Solution:

2MnO4-+ 16 H+ + 10Cl→ 2Mn2+ + 5Cl2 + 8H2O

QUESTION: 150

NO2 is not obtained on heating

Solution:

QUESTION: 151

The normality of 30 volume H2O2 is

Solution:

Volume strength = 5.6 × normality      

30 = 5.6 × N

N = 30/5.6 = 5.3

 

QUESTION: 152

Reaction of formaldehyde and ammonia gives

Solution:

6HCHO + 4NH3 → (CH2)6 N4 + 6H2O

QUESTION: 153

A plot of In k against  1/T (abscissa) is expected to be a straight line with intercept on ordinate axis equal to

Solution:

ΔG° = – RT  InK

or,   ΔH° – TΔS° = – RT InK

 

QUESTION: 154

Which of the following represents the composition of Carnallite mineral?

Solution:
QUESTION: 155

The solubility of Ca3(PO4)2 in water is y moles / litre. Its solubility product is

Solution:

QUESTION: 156

Paracetamol is

Solution:

QUESTION: 157

Anhydrous ferric chloride is prepared by

Solution:

QUESTION: 158

Which one of the following is s-butyl phynylvinyl methane?

Solution:

QUESTION: 159

Hybridization of C2 and C3 of H3C – CH = C = CH – CH3 are

Solution:

QUESTION: 160

Which of the following compounds is not formed in iodoform reaction of acetone

Solution:

QUESTION: 161

Glucose and amino acids are reabosorbed in the

Solution:

Glucose and amino acids are reabsorbed in the proximal tubule of nephron.

QUESTION: 162

The amount of CSF in the cranial cavity

Solution:

The amount of CSF in the cranial cavity is 140 ml.

QUESTION: 163

Which one is imino acid?

Solution:

Proline and hydroxyproline are imino acids.

QUESTION: 164

The main difference between Gram positive and Gram negative bacteria is

Solution:
QUESTION: 165

ACTH is secreted from

Solution:

ACTH is secreted from anterior pituitary

QUESTION: 166

Which of the following is the correct pathway for propagation of cardiac impulse?

Solution:
QUESTION: 167

Inner surface of the bronchi, bronchioles and fallopian tubes are lined by

Solution:

Ciliated epithelium is found in inner surface of bronchi, bronchioles and fallopian tubes

QUESTION: 168

Electric potential of the brain is recorded by

Solution:

Electrical potential of brain is recorded by EEG

QUESTION: 169

Which of the following is related to humoral immunity?

Solution:

Humoral immunity is due to B-lymphocyte because it secretes antibody in the blood plasma.

QUESTION: 170

Fertilization occur in

Solution:

Fertilization occurs in fallopian tube at the junction of ampulla and isthmus.

QUESTION: 171

The Gastrin is secreted from

Solution:

Gastrin hormone is secreted from “G-cells” of stomach.

QUESTION: 172

The cause of cretinism is

Solution:

Cretinism is caused by hyposecretion of thyroxine in children.

QUESTION: 173

Which of the following is a minerelocorticoid?

Solution:

Aldosterone is secreted from adrenal cortex and controls RAAS. mechanism.

QUESTION: 174

The part of the brain where the centre for hunger and thirst is located is

Solution:

Hypothalamus is the centre for hunger and thirst.

QUESTION: 175

The reflex arc, which is made of two neurones is known as

Solution:

Monosynaptic reflex are has two neurons sensory and motor, which forms one synapse in CNS.

QUESTION: 176

The lactase hydrolyzes lactose into

Solution:

Lactose → Glucose  + Galactose

QUESTION: 177

In 24 hours, total glomerular filtrate formed in human kidney is

Solution:

GFR is 120 ml/min, so, approx. 170 litre ultra fitrate is produced in 24 hrs.

QUESTION: 178

When the oxygen supply to the tissue is inadequate, the condition is

Solution:

  Inadequate supply of oxygen to the tissue is called hypoxia

QUESTION: 179

Which one of the following is not a second messenger in hormone action?