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\( \ln C u S O_{4} .5 H_{2} O \) how many molecules
of water are indirectly connected to Cu?
\( \mathbf{A} \cdot \mathbf{5} \)
B. 4
\( c \cdot 2 \)
D.
| 1 |
Chemistry
|
A neutron star has a density equal to that of the nuclear matter. Assuming the star to be spherical, find the radius of a neutron star whose mass is \( 4.0 \times \)
\( 10^{30} k g( \) twice the mass of the sun)
| 3 |
Physics
|
Illuminating the surface of a certain metal alternately with light of
wavelength \( \lambda_{2}=0.54 \mu m \) and \( \lambda_{2}= \)
\( 0.54 \mu m, \) it was found that the
corresponding maximum velocities of photo electrons have a ratio \( \eta=2, \) Find the work function of that metal.
A \( .6 .99 e V \)
B. \( 1.9 e V \)
c. \( 7.53 e V \)
D. \( 1.88 e V \)
| 3 |
Physics
|
Are senses reliable for accurate
measurement?
A . True
B. False
| 3 |
Physics
|
If \( I=\int(\sqrt{\frac{a+x}{a-x}}+\sqrt{\frac{a-x}{a+x}}) d x, \) then
equals
\( \mathbf{A} \cdot 2 \sin ^{-1}\left(\frac{x}{a}\right)+C \)
B. \( 2 a \sin ^{-1}\left(\frac{x}{a}\right)+C \)
\( c \cdot 2 \cos ^{-1}\left(\frac{x}{a}\right)+C \)
D \( \cdot 2 a \cos ^{-1}\left(\frac{x}{a}\right)+C \)
| 2 |
Maths
|
In Rutherford experiment, number of
particles scattered at \( 90^{0} \) angle are \( x \)
per second.number of particles
scattered oper second at angle \( 0^{0} \) is
\( A \)
B. \( 4 x \)
\( c \cdot 8 x \)
D. \( 16 x \)
| 3 |
Physics
|
solve
\( \mathbf{3} \boldsymbol{x}=\mathbf{3} \mathbf{3} \mathbf{6}+\mathbf{2} \mathbf{4} \mathbf{3} \)
| 2 |
Maths
|
What are outside raw materials used by
an organism?
A. Food by heterotrophic organisms
B. Carbon dioxide, minerals and water by autotrophic organisms
C. Oxygen by all aerobic organisms
D. All of the above
| 0 |
Biology
|
What happens to the rate of evaporation when there is more exposed surface area of liquid?
A. It decreases gradually
B. It increases
c. Remains same
D. It decreases rapidly
| 3 |
Physics
|
Give a mathematical relation between
Heat Capacity and Specific Heat Capacity.
| 3 |
Physics
|
Acceleration due to gravity as a
function of \( r \) is given by
A \( \cdot \frac{4}{3} \pi G r(A-B R) \)
B . \( 4 \pi G r(A-B R) \)
c. \( \frac{4}{3} \pi G r\left(A-\frac{3}{4} B R\right) \)
D \( \cdot \frac{4}{3} \pi G r\left(A-\frac{4}{3} B R\right) \)
| 3 |
Physics
|
The points with the co-ordinates
\( (2 a, 3 a),(3 b, 2 b) \&(c, c) \) are collinear.
| 2 |
Maths
|
The stress-strain curve shows a
straight line along the third quadrant
What does it depict
A. Elongation in the negative \( x \) - direction
B. compression
c. Negative Youngs modulus
D. Decreasing stress
| 3 |
Physics
|
Decomposition of \( \boldsymbol{H}_{2} \boldsymbol{O}_{2} \) can be
prevented by addition of
A . Acetanilide
B. Benzene
c. Alkali metal oxide
D. \( M n O_{2} \)
| 1 |
Chemistry
|
Which of the following has tendency to \( \operatorname{act} \) as an oxidising agent?
\( A \cdot C e^{4} \)
B. \( \mathrm{Sm}^{2+} \)
\( c \cdot L u^{3} \)
D. \( \operatorname{Gd}^{3} \)
| 1 |
Chemistry
|
50 g limestone is heated. The quantity of quicklime produced is:
A. \( 56 g \)
в. 28 \( g \)
\( c \cdot 14 g \)
D. 108
| 1 |
Chemistry
|
A material 'B' has twice the specific resistance of 'A'. A circular wire made of
B' has twice the diameter of wire made
of 'A' then for the two wires to have the same resistance, the ratio, \( \frac{\boldsymbol{I}_{B}}{\boldsymbol{I}_{A}} \) of their
respective length must be
\( A \)
B. 1/2
\( c \cdot 1 / 4 \)
D. 2
| 3 |
Physics
|
Aqueous humour is a
and vitreous humour is
\( a \)
A. transparent jelly, viscousfluid
B. transparent jelly, watery fluid
c. viscous fluid, viscous fluid
D. viscous fluid, transparent jelly
| 3 |
Physics
|
Write two differences between ideal
solutions and non-ideal solutions.
| 1 |
Chemistry
|
If the square of \( (a+i b) \) is real, then
\( \boldsymbol{a} \boldsymbol{b}= \)
\( \mathbf{A} \cdot \mathbf{0} \)
B.
c. -1
D. 2
| 2 |
Maths
|
Cortical portions projecting between the medullary pyramids in the human kidney
| 0 |
Biology
|
Which of the following is an example of simple fuel cell?
A. Lead storage battery
B. Leclanche cell
c. \( H_{2} O_{2} \)
D. All of the above
| 1 |
Chemistry
|
The only liquid which is a good conductor of heat is-
A. water
B. turpentine
c. alcohol
D. mercury
| 3 |
Physics
|
Which of the following phenomena will occur when two atoms of the elements
having same spin of electron approach for bonding?
A. Orbital overlap will not occur
B. Bonding will not occur
c. Both \( A \) and \( B \) are correct
D. None of the above
| 1 |
Chemistry
|
The branched sclereids present in hydrophytes are
A. Osteosclereids
B. Trichosclereids
c. Macrosclereids
D. Astrosclereids
| 0 |
Biology
|
State whether given statement is True or False
Light waves require no medium for their propagation.
A. True
B. False
| 3 |
Physics
|
If five \( G . M .^{\prime} s \) are inserted between 486
and \( \frac{2}{3} \) then fourth \( G . M \) will be
\( A \cdot 4 \)
B. 6
c. 12
D. - 6
| 2 |
Maths
|
A elevator car whose floor to distance is
\( 2.7 \mathrm{m} \) starts ascending with a constant
acceleration of \( 1.2 m / s^{2}, 2 s \) after a bolt is begin to fall from the ceiling of the car. The free fall time of the bolt is \( (g= \)
\( \left.9.8 m / s^{e}\right) ? \)
A \( \cdot \sqrt{\frac{2.7}{9.8}} s \)
в. \( \sqrt{\frac{5.4}{9.8}} s \)
c. \( \sqrt{\frac{5.4}{8.6}} s \)
D. \( \sqrt{\frac{5.4}{11}} \)
| 3 |
Physics
|
Give the next decimal numbers the
sequence:
\( (a) 1.32,1.42,1.52, \dots \dots . . \)
(b) \( 1.14,1.25,1.36, \dots \dots . . . \)
| 2 |
Maths
|
A maths exam is marked out of 120
Passing mark percentage is \( 40 \% \).What are marks required for passing?
\( \mathbf{A} \cdot 48 \)
в. 110
c. 54
D. 72
| 2 |
Maths
|
The most important features of
superconductor is that
A. once current is set up in a superconductor ring, it will continue indefinitely even if the battery is off
B. it has high efficiency compared to other conductors
C. it can pass maximum no of electrons when current is passed through it.
D. none of the above
| 3 |
Physics
|
The minimum possible angular momenturn of an election present in an orbital is \( \ldots \ldots . . . . . . \) if the magnetic quanthem number associated with this
orbinal are -1,0,+1
A \( \cdot \frac{5 h}{2 \pi} \)
в. \( \frac{3 h}{2 \pi} \)
\( c \cdot \frac{h}{2 \pi} \)
D. \( \frac{h}{\pi} \)
| 1 |
Chemistry
|
The distance between a north pole of
strength \( 6 \times 10^{-3} A m \) and south pole of
strength \( 8 \times 10^{-3} \mathrm{Am} \) is \( 10 \mathrm{cm} . \) The poles
are separated in air. The force between
them:
A \( \cdot 4.8 \times 10^{-11} N \)
В. \( 24 \times 10^{-11} N \)
\( \mathbf{c} \cdot 48 \times 10^{-11} N \)
D. \( 24 \times 10^{-12} N \)
| 3 |
Physics
|
Medicines are more effective in their
colloidal form.
| 1 |
Chemistry
|
I ne IIgure snows lour palrs ol unılormıy
charged spheres. The red spheres are positively charged while the blue spheres are negatively charged. Each sphere has the same amount of charge. Assume each pair is isolated. For which pair there is a point between
them on the dotted line where the
magnitude of electric field is zero as well as the electric potential is also
zero?
A.
B. 2
\( c \cdot 3 \)
D. 4
E. None of the pairs has points that meet these conditions
| 3 |
Physics
|
In this circuit, when certain current
flows, the heat produced in \( 5 \Omega \) is \( 4.05 J \)
in a time \( t . \) The heat produced in \( 2 \Omega \) coil
in the same time interval is
A . 5.76
в. 1.44
\( c .2 .88 \)
D. 2.02
| 3 |
Physics
|
Prove that \( : \cos ^{-1}\left(\frac{3}{5}\right)+\cos ^{-1}\left(\frac{4}{5}\right)= \)
\( \frac{\pi}{2} \)
| 2 |
Maths
|
In which of the following reaction, the
value of \( \boldsymbol{K}_{\boldsymbol{P}} \) will be equal to \( \boldsymbol{K}_{\boldsymbol{C}}- \)
A \( \cdot N_{2}(g)+O_{2}(g) \rightleftharpoons 2 N O(g) \)
в. \( P C l_{5}(g) \rightleftharpoons P C l_{3}(g)+C l_{2}(g) \)
C. \( 2 N H_{3}(g) \rightleftharpoons N_{2}(g)+3 H_{2}(g) \)
\( \mathbf{D} \cdot 2 S O_{2}(g)+O_{2} \rightleftharpoons 2 S O_{3}(g) \)
| 1 |
Chemistry
|
Find the gases which is the densest at standard temperature and pressure.
A. Helium
B. Argon
c. carbon dioxide
D. xenon
E. Nitrogen
| 1 |
Chemistry
|
Consider a square of side length 1 unit.
What is its area?
| 2 |
Maths
|
Natural rubber is a
\( A \). trans isomer
B. cis isomer
C. racemic mixture
D. equal amount of cis and trans
| 1 |
Chemistry
|
Which of the following are used as nuclear fuel?
\( \mathbf{A} \cdot_{82} P b^{208} \)
В \( \cdot 92 U^{235} \)
\( \mathbf{c} \cdot_{92} U^{238} \)
D. Both (B) and (C)
| 3 |
Physics
|
Choose the correct answer from the
alternatives given :
Given \( 1+2+34++10=55 \) then the \( \operatorname{sum} 6+12+18+24++60 \) is equal to
A . 300
B. 655
\( c .330 \)
D. 455
| 2 |
Maths
|
Construct \( \triangle M N O \) such that \( N O= \)
\( \mathbf{6 . 2} \mathrm{cm}, \angle \boldsymbol{N}=\mathbf{5 0}^{\circ} \) and \( \boldsymbol{M} \boldsymbol{O}-\boldsymbol{M} \boldsymbol{N}= \)
\( 2.4 \mathrm{cm} \)
| 2 |
Maths
|
How many grams of ammonium chloride should be dissolved in \( 500 \mathrm{mL} \)
of water to have a solution of pH \( 4.5 ? \)
\( \left[K_{b} \text { for ammonium hydroxide is } 1.8 \times\right. \)
\( \left.10^{-5}\right] \)
A . 25.22
B. 48.15
c. 53.5
D. 90
| 1 |
Chemistry
|
\( f(x)=\lim _{n \rightarrow \infty} \frac{\tan ^{2 n} x \cdot \sin x}{x} \) then
\( \lim _{x \rightarrow 0} f(x)=1 \)
If true enter 1 , else enter 0 .
| 2 |
Maths
|
An inductance of \( 2 H \) carries a current
of \( 2 A . \) To prevent sparking when the circuit is broken a capacitor of \( 4 \mu F \) is connected across the inductance. The
voltage rating of the capacitor is of the order of :
B. \( 10 V \)
\( \mathbf{c} \cdot 10^{5} V \)
D. \( 10^{6} V \)
| 3 |
Physics
|
Factorize by the grouping method:
\( 16(a+b)^{2}-4 a-4 b \)
A \( .4(a-3 b)(4 a+4 b-1) \)
B . \( 4(2 a+b)(a+4 b-3) \)
c. \( 4(a-b)(4 a-4 b-1) \)
D. \( 4(a+b)(4 a+4 b-1) \)
| 2 |
Maths
|
Evaluate: \( \int_{0}^{1} e^{x} d x+\int_{1}^{e} \ln x d x \)
| 2 |
Maths
|
Which of the statements are false?
A. The units of physical quantity represented by volume is \( c m^{3} \)
B. The unit of physical quantity represented by mass is \( \operatorname{ton} \)
C the work done is represented by \( \frac{k g}{m} \)
D. The unit of physical quantity represented by weight is Newton
| 3 |
Physics
|
If \( f(x)=x+3, \) then find the value of
the function \( \boldsymbol{f}(\boldsymbol{x})+\boldsymbol{f}(-\boldsymbol{x}) \)
| 2 |
Maths
|
In the figure if \( D E \| B C \) and \( A D= \)
\( \mathbf{3} \boldsymbol{x}-\mathbf{2}, \boldsymbol{A} \boldsymbol{E}=\mathbf{5} \boldsymbol{x}-\mathbf{4}, \boldsymbol{B} \boldsymbol{D}=\mathbf{7} \boldsymbol{X}-\mathbf{4} \)
\( B D-7 x-5 \) AND \( C E=5 x-3 . \) Find
\( \mathbf{x} \)
| 2 |
Maths
|
If one of the diagonals of a square is along the line \( x=2 y \) and one of its
verices is \( (3,0), \) then its side through this vertex nearer to the origin is given by the equation.
A. \( y-3 x+9=0 \)
В. \( 3 y+x-3=0 \)
c. \( x-3 y-3=0 \)
D. \( 3 x+y-9=0 \)
| 2 |
Maths
|
Name two \( \alpha \) -amino acids, which form a dipeptide, which is 100 times more
sweet than cane sugar?
This question has multiple correct options
A. Aspartic acid
B. Alanine
c. serine
D. Phenylalanine
E. Tryptophan
| 1 |
Chemistry
|
Which of the following is incorrect regarding ZW-ZZ type of sex determination?
A. It occurs in birds and some reptiles.
B. Females are homogametic and males are heterogametic.
c. sex ratio is produced in the offsprings.
D. All of the above
| 0 |
Biology
|
A bullet moving at \( 250 \mathrm{m} / \mathrm{s} \) penetrates \( 5 \mathrm{cm} \) into a tree limb before coming to
rest. Assuming that the force exerted by the tree limb is uniform, find its magnitude. Mass of the bullet is \( 10 g \).
A . \( 625 N \)
В. \( 6250 N \)
\( c \cdot 62.50 N \)
D. \( 6.250 N \)
| 3 |
Physics
|
Which of the following compounds exhibits stereoisomerism?
A. 2-Methylbutene
B. 3-Methylbutane
c. 3-Methylbutanoic acid
D. 2-Methylbutanoic acid
| 1 |
Chemistry
|
Find the values of the following
determinants
\( \left|\begin{array}{cc}\mathbf{2} \boldsymbol{i} & -\mathbf{3} i \\ \boldsymbol{i}^{3} & -\mathbf{2} \boldsymbol{i}^{5}\end{array}\right| \) where \( \boldsymbol{i}=\sqrt{-\mathbf{1}} \)
| 2 |
Maths
|
If the focal length of a convex mirror is
\( 16 \mathrm{cm}, \) what is its radius of curvature?
\( A \cdot 8 \mathrm{cm} \)
B. \( 16 \mathrm{cm} \)
c. \( 32 \mathrm{cm} \)
D. \( 10 \mathrm{cm} \)
| 3 |
Physics
|
A rectangular \( A 4 \) size paper is kept on cartesian plane coinciding the points \( (3,0),(-1,0),(0,-2) . \) Find the area of the paper in sq. units.
A . 12
B. 8
c. 16
D. 10
| 2 |
Maths
|
A gold leaf electroscope is given a positive charge so that its leaves diverge. How is the divergence of leaves affected, when a negatively charged rod is brought near its disc?
A. divergence increases
B. divergence decreases
c. divergence remains same
D. can't say
| 3 |
Physics
|
How many moles of electrons are
needed in the balanced equation for the oxidation of ethanol (1 mol) to acetic
\( \operatorname{acid} ?\left(C_{2} H_{5} O H \rightarrow C H_{3} C O O H\right) \)
\( \mathbf{A} \cdot \mathbf{1} \)
B . 2
\( c .3 \)
D. 4
| 1 |
Chemistry
|
An electric heater operating at \( 220 V \) boils \( 5 l \) of water in 5 min. If it is used
on \( 110 V, \) it will boil the same amount of water in:
A . 10 min
B. 20 min
\( c .15 \) min
D. 25 min
| 3 |
Physics
|
Prove that no matter what the real
number \( a \) and \( b \) are, the sequence with
the \( n t h \) term \( (a+n b) \) is always an \( A P \)
Also find the sum of first 20 terms.
| 2 |
Maths
|
What value does chipko movement
invoke?
| 0 |
Biology
|
For the following reaction at \( 250^{\circ} \mathrm{C} \), the
value of \( K_{c} \) is \( 26, \) then the value of \( K_{p} \) at the same temperature will be:
\( \boldsymbol{P C l}_{3}(\boldsymbol{g})+\boldsymbol{C l}_{2}(\boldsymbol{g}) \rightleftharpoons \boldsymbol{P} \boldsymbol{C l}_{5}(\boldsymbol{g}) \)
A . 0.57
B. 0.61
c. 0.83
D. 0.91
| 1 |
Chemistry
|
When is a transistor said to be in active
state? Draw a circuit diagram of a p-np transistor and explain how it works as
a transistor amplifier. Write clearly, why in the case of a transistor
(i) the base is
thin and lightly doped and (ii) the emitter is heavily doped.
| 3 |
Physics
|
Bioluminescence was first recorded in
A. Gonyaulax
B. Peridinium
C. Noctiluca
D. Pyrodinium
| 0 |
Biology
|
Aerobic respiratory pathway is appropriately termed
A. Catabolic.
B. Parabolic.
c. Amphibolic.
D. Anabolic.
| 0 |
Biology
|
In three test tubes \( A, B \) and \( C, \) three
different liquids namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. An equal amount of soap solution is added
to each test tube and the contents are
shaken. In which test tube will the
ength of the foam (lather) be longest?
Justify your answer.
| 1 |
Chemistry
|
Find the smallest number which should
be multiplied to 10584 to get a perfect
cube.
| 2 |
Maths
|
Fire can be extinguished by spraying:
A. carbon dioxide
B. carbon tetrachloride
c. water
D. all of the above
| 1 |
Chemistry
|
To construct a triangle similar to given \( \Delta A B C \) with its sides \( \frac{4}{5} \) of that of
\( \Delta A B C, \) locate points \( X_{1}, X_{2}, X_{3}, \dots . . \)
on ray \( B X \) at equal distances such that
\( \angle A B X \) is acute. The points to be joined
in the next step are:
A. \( X_{4}, C \)
в. \( X_{5}, C \)
c. \( x_{4}, A \)
D. \( X_{5}, A \)
| 2 |
Maths
|
Diarrhoea:: Constipation :: Enteritis::
A . Diarrhoea
B. Typhoid
c. Tetanus
D. Malaria
| 0 |
Biology
|
Give examples androgens and
estrogens.
| 0 |
Biology
|
Peptization is a characteristic property
of sols.
A . True
B. False
| 1 |
Chemistry
|
What will be the volume of the air that
will be expelled from a vessel of
\( 300 \mathrm{cm}^{3} \) when it is heated from \( 27^{\circ} \mathrm{C} \) to
\( 37^{\circ} \mathrm{C} \) at the constant pressure will be :
A \( \cdot 310 \mathrm{cm}^{3} \)
В. \( 290 \mathrm{cm}^{3} \)
\( \mathrm{c} \cdot 10 \mathrm{cm}^{3} \)
D. \( 37 \mathrm{cm}^{3} \)
| 1 |
Chemistry
|
The amplitudes of two interfering waves are \( 4 \mathrm{cm} \) and \( 3 \mathrm{cm} \) respectively. If the
resultant amplitude is \( 1 \mathrm{cm} \) then the
interference becomes
A. constructive
B. Destructive
c. Both constructive and destructive
D. given data is insufficient
| 3 |
Physics
|
Write hybridization and geometry of
\( a) \dot{C} l O_{3} \)
b) \( \dot{C} F_{3} \)
| 1 |
Chemistry
|
A small uniform tube is hent into a
circle of radius r whose plane is vertical. Equal volumes of two fluids whose
densities are \( p \) and \( \sigma(\rho>\sigma) \) fill
half the circle. Find the angle that the
radius passing through the interface
makes with the vertical
| 3 |
Physics
|
The initial concept about the origin of universe was given by
A. Bondi
B. Hawllacks
c. Narlikar
D. Hubble
| 3 |
Physics
|
The heat energy obtainable from hot
rocks present inside the earth crust is
termed as
A. Nuclear energy
B. Tidal energy
c. Geothermal energy
D. None of these
| 3 |
Physics
|
(a) Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled?
(b) Why is diamagnetism, in contrast, almost independent of temperature?
(c) If a toroid uses bismuth for its core,
will the field in the core be (slightly) greater or (slightly) less than when the core is empty?
(d) Is the permeability of a ferromagnetic material independent
of the magnetic field? If not, is it more for lower or higher fields?
(e) Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.) Why?
(f) Would the maximum possible magnetisation of a paramagnetic sample be of the same order of magnitude as the magnetisation of a ferromagnet?
| 3 |
Physics
|
\( H_{2} O_{2} \) has the higher boiling point than water due to stronger hydrogen bonding
A. True
B. False
| 1 |
Chemistry
|
Point out the correct statement
amongst the following.
\( \mathbf{A} \)
\( \left[C u\left(C N_{4}\right)\right]^{3-} \) has tetrahedral geometry and \( d s p^{2} \)
hybridization
B. \( \left[N i\left(C N_{6}\right)\right]^{4-} \) is octahedral and \( \mathrm{Ni} \) had \( d^{2} s p^{3} \)
hybridization
\( ^{\mathbf{C}} \cdot\left[Z n B r_{4}\right]^{2-} \) is tetrahedral and diamagnetic
D. \( \left[C r\left(N H_{3}\right)_{6}\right]^{3+} \) has octahedral geometry and \( s p^{3} d^{2} \)
hybridization
| 1 |
Chemistry
|
A primary suffix are:
A . -ane
B. -ene
\( c . \) -yne
D. all of these
| 1 |
Chemistry
|
Show that \( \sin ^{-1}(2 x \sqrt{1-x^{2}})=2 \sin ^{-1} x \)
| 2 |
Maths
|
Polythene is which type of waste?
A. Domestic
B. Industrial
c. Chemical
D. None of these
| 1 |
Chemistry
|
Total order of reaction \( \boldsymbol{X}+\boldsymbol{Y} \rightarrow \boldsymbol{X} \boldsymbol{Y} \) is
3
The order of reaction with respect to \( X \) is
2.
State the differential rate equation for
the reaction.
\( ^{\mathbf{A}} \cdot-\frac{d[X]}{d t}=k[X]^{0}[Y]^{3} \)
в. \( -\frac{d[X]}{d t}=k[X]^{3}[Y]^{0} \)
\( ^{\mathrm{c}} \cdot \frac{d[X]}{d t}=k[X]^{2}[Y] \)
D. \( -\frac{d[X]}{d t}=k[X][Y]^{2} \)
| 1 |
Chemistry
|
2,4 -dichlorophenoxyacetic acid is used
as:
A. fungicide
B. insecticide
C. herbicide
D. moth repellant
| 1 |
Chemistry
|
When \( \mathrm{NH}_{4} \mathrm{NO}_{3} \) is heated the gas formed
is :
\( A \cdot N_{2} O \)
в. NO
\( c \cdot N O_{2} \)
D. NH
| 1 |
Chemistry
|
For an elementary reaction, \( \boldsymbol{X}(\boldsymbol{g}) \rightarrow \) \( \boldsymbol{Y}(\boldsymbol{g})+\boldsymbol{Z}(\boldsymbol{g}) \)
the half life period is 10 min. In what period of time would concentration of \( \boldsymbol{X} \)
be reduced to \( 10 \% \) of original concentration?
A . 20 min
B. 33 Min
c. 15 min
D. 25 Min
| 1 |
Chemistry
|
An ideal choke takes a current of \( 8 A \)
when connected to an a.c source of 100
volt and 50 Hz. A pure resistance under
the same conditions takes a current of
10A. If two are connected in series to an
a.c. Supply of \( 150 \mathrm{V} \) and \( 40 \mathrm{Hz} \), then the current in the series combination of
above resistor and conductor is:
| 3 |
Physics
|
Fill in the blanks
| 2 |
Maths
|
Action of soap is due to emulsification and micelle formation. Comment.
| 1 |
Chemistry
|
The value of \( \int_{0}^{\pi / 4} \log (1+\tan x) d x \) is
equal to
A \( \cdot \frac{\pi}{8} \log _{e} 2 \)
в. \( \frac{\pi}{4} \log _{e} 2 \)
c.
D. none of these
| 2 |
Maths
|
The formation of the oxide ion \( O^{2-}(g) \)
requires first an exothermic and then an endothermic step as shown below.
\( \boldsymbol{O}(\boldsymbol{g})+\boldsymbol{e}^{-} \rightarrow \boldsymbol{O}^{-}(\boldsymbol{g}) ; \boldsymbol{\Delta} \boldsymbol{H}^{0}= \)
\( -142 k J m o l^{-1} \)
\( \boldsymbol{O}^{-}(\boldsymbol{g})+\boldsymbol{e}^{-} \rightarrow \boldsymbol{O}^{2-}(\boldsymbol{g}) ; \boldsymbol{\Delta} \boldsymbol{H}^{0}= \)
\( 844 k J m o l^{-1} \)
The correct statement is?
A. Oxygen is more electronegative
B. \( O^{-} \) ion has comparatively larger size than oxygen atom
\( \mathrm{c} \cdot O^{-} \) ion will tend to resist the addition of another
electron
D. Oxygen has high electron affinity
| 1 |
Chemistry
|
How many lone pairs are associated with xenon in xenon difluoride?
\( A \)
B. 2
\( c \cdot 3 \)
D. 4
| 1 |
Chemistry
|
Write the differences between:
Open and closed systems of circulation
| 0 |
Biology
|
Base of the rectangular prism is in the
form of a
A. Square
B. Rectangle
c. circle
D. Triangle
| 2 |
Maths
|
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