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If K.E. of an electron, \( \alpha- \) particle and a
proton are represented by \( \boldsymbol{E}_{1}, \boldsymbol{E}_{2} \) and \( \boldsymbol{E}_{3} \) respectively (provided all these have same de Broglie wavelength) then
A \( . E_{1}=E_{2}=E_{3} \)
в. \( E_{1}>E_{2}>E_{3} \)
c. \( E_{1}>E_{3}>E_{2} \)
D. \( E_{2}>E_{3}>E_{1} \) | 1 | Chemistry |
In the rhombus \( A B C D, A C \) and \( B D \) are the diagonals. If the diagonals are \( 16 \mathrm{cm} \) and \( 12 \mathrm{cm} . \) Find the length of each of its sides.
\( A \cdot 10 \mathrm{cm} \)
B. 12 \( \mathrm{cm} \)
\( c \cdot 9 \mathrm{cm} \)
D. \( 8 \mathrm{cm} \) | 2 | Maths |
The value of ' \( m_{s} \) ' for an electron
spinning in clock-wise direction is and for anti-clockwise
direction is | 1 | Chemistry |
Wand X are \( _{\text {- - }} \), respectively.
\( A \cdot O_{3} \) and \( P_{4} O_{6} \)
B. \( O_{2} \) and \( P_{4} O_{6} \)
\( \mathrm{c} \cdot \mathrm{O}_{2} \) and \( P_{4} \mathrm{O}_{1} \)
D. \( O_{3} \) and \( P_{4} O_{1} \) | 1 | Chemistry |
An inclined plane makes an angle \( 30^{\circ} \)
with horizontal. A groove OA=5cm cut on the plane makes an angle \( 30^{0} \) with \( 0 x \)
A short smooth cylinder is free ti slide down the groove under the influence of gravity. the time taken by the cylinder to
reach from \( A \) to 0 is \( \left(g=10 m / s^{2}\right) \)
\( \mathbf{A} \cdot 4 s \)
в. \( 10 s \)
c. \( 2 s \)
D. \( 5 s \) | 3 | Physics |
Let \( y=e^{\sqrt{x}} \) then find \( \frac{d y}{d x} \) | 2 | Maths |
Which polymer among the following polymers does NOT soften on heating?
A. Bakelite
B. Polythene
c. Polystyrene
D. PVC | 1 | Chemistry |
If a concave lens of very large focal
length \( 100 \mathrm{cm} \) is placed in contact with the convex lens, find the shifting of the image | 3 | Physics |
Which of the following reaction(s) can be used for the preparation of alkyl halides?
(I) \( C H_{3} C H_{2} O H+H C l \quad \) anh. \( Z n C l_{2} \)
(II) \( C H_{3} C H_{2} O H+H C l \rightarrow \)
\( (\| I)\left(C H_{3}\right)_{3} C O H+H C l \rightarrow \)
\( (\mathrm{IV})\left(\boldsymbol{C H}_{3}\right)_{2} \boldsymbol{C H O H}+\boldsymbol{H C l} \stackrel{\boldsymbol{a n h . Z n C l}_{2}}{\longrightarrow} \)
\( \mathbf{A} \cdot(I V) \) only
B. (III) and (IV) onlyyy y
c. \( (I),(I I I) \) and \( (I V) \) only
D. \( (I) \) and \( (I I) \) only | 1 | Chemistry |
What are the different ways in which
glucose is oxidised to provide energy in various organism? | 1 | Chemistry |
Which of the following pair is incorrectly matched?
A. Van Arkel method - Zirconium
B. Krolls process - Titanium
c. Froth Floatation - Cerussite
D. Distillation - zinç | 1 | Chemistry |
Convert the following ratio into
percentage:
\( \frac{\mathbf{5 4 6}}{\mathbf{6 0 0}} \) | 2 | Maths |
The predominant antibody in saliva is
A . \( \lg G \)
B. \( \lg A \)
c. \( \lg \) m
D. IgD | 0 | Biology |
The oxidation states of \( S \) atoms in
\( S_{4} O_{6}^{2-} \) from left to right respectively
are:
\( \boldsymbol{O}-\underbrace{\boldsymbol{O}}{\boldsymbol{S}}-\boldsymbol{S}-\boldsymbol{S}-\underset{\boldsymbol{V}}{\|}^{\boldsymbol{O}}-\boldsymbol{O}^{-} \)
\( A \cdot+6,0,0,+6 \)
B. +3,1,+1,+3
\( c \cdot+5,0,0,+5 \)
D. None of above | 1 | Chemistry |
The \( \Delta H \) for the reaction at \( 0^{\circ} \mathrm{C} \)
\( Z n+2 A g C l \rightarrow Z n C l_{2}+2 A g \)
is -52.05 kcal. If the e.m.f. of the cell is
1.015 volt, the temperature coefficient of
the cell at \( 0^{\circ} \mathrm{C} \) in \( V /^{o} C \) is:
A . \( -4.311 \times 10^{-4} \)
В . \( 2.388 \times 10^{-4} \)
c. \( 4.311 \times 10^{-4} \)
D. \( 4.311 \times 10^{-5} \) | 1 | Chemistry |
In Searle's experiment to find Young's
modulus, the diameter of wire is
measured as \( D=0.05 \mathrm{cm}, \) the length of
wire is \( L=125 c m, \) and when a weight,
\( \boldsymbol{m}=20 k g \) is the put, extension in wire
was found to be \( 0.100 \mathrm{cm} \). Find the
maximum permissible error in Young's modulus \( (Y) \) | 3 | Physics |
A force \( F \) is related to the position of \( a \)
particle by the relation \( \boldsymbol{F}=\left(\mathbf{1 0} \boldsymbol{x}^{2}\right) \boldsymbol{N} \)
The work done by the force when the particle moves from \( x=2 m \) to \( x=4 \) m is
A \( \cdot \frac{56}{3} J \)
в. \( 560 J \)
c. \( \frac{560}{3} J \)
D. \( \frac{3}{560} J \) | 3 | Physics |
The indicator used in the titration of a
strong acid and a strong base is/are :
This question has multiple correct options
A. phenolphthalein
B. methyl orange
c. alizarin yellow
D. red litmus | 1 | Chemistry |
What is the main difference between
electromagnetic wave theory and
Planck's quantum theory?
A. According to electromagnetic wave theory, the energy is emitted or absorbed continuously whereas according to Planck's quantum theory, energy is emitted or absorbed discontinuously,i.e. in certain definite packets called 'Quanta'
B. According to electromagnetic wave theory, energy is emitted or absorbed discontinuously, i.e., in certain definite packets called 'Quanta' whereas according to Planck's quantum theory, the energy is emitted or absorbed continuously
C. According to electromagnetic wave theory, the energy is emitted or absorbed continuously whereas according to Planck's quantum theory, energy is emitted or absorbed continuously,i.e. in certain definite packets called 'Quanta'
D. According to electromagnetic wave theory, the energy is emitted or absorbed discretely whereas according to Planck's quantum theory, energy is emitted or absorbed discontinuously, i.e., in certain definite packets called'Quanta' | 1 | Chemistry |
A force acting on a particle varies with
the displacement \( x \) as \( F=a x-b x^{2} \)
Where \( a=1 N / m \) and \( b=1 N / m^{2} \)
The work done by this force for the first
one meter \( (F \text { is in newtons, } x \) is in
meters is:
A \( \cdot \frac{1}{6} J \)
в. \( \frac{2}{6} J \)
c. \( \frac{3}{6} J \)
D. None of these | 3 | Physics |
\( C_{6} H_{5} C \equiv N \) and \( C_{6} H_{5} N \equiv C \) are
which type of isomers?
A. Position
B. Functional
c. Tautomerism
D. Linkage | 1 | Chemistry |
Define a scalar matrix. | 2 | Maths |
Solutions of copper sulphate, iron
sulphate and zinc sulphate are prepared and marked I, II and III respectively. Few pieces of aluminium are added to each solution. After some
time a change will be observed in:
A. I and II
B. Il and III
c. III and
D. all the three | 1 | Chemistry |
Which of the following statement are
correct?
This question has multiple correct options
A. Orthophosphoric acid is used as a stabilizer for \( H_{2} O_{2} \)
B. Orthophosphoric acid is used for making phosphorus and phosphates.
C. Orthophosphoric acid is used preparation of \( H B r \) in the laboratory.
D. Orthophosphoric acid is a tribasic acid. | 1 | Chemistry |
Explain what is galvanization. What purpose is served by it? | 1 | Chemistry |
\( \int e^{x}\left(\frac{2+\sin 2 x}{1+\cos 2 x}\right) d x= \)
A \( \cdot e^{x} \cot x+c \)
B \( \cdot 2 e^{x} \sec ^{2} x+c \)
\( \mathbf{c} \cdot e^{x} \cos 2 x+c \)
D. \( e^{x} \tan x+c \) | 2 | Maths |
The equation of a transverse wave
travelling on a rope is given by \( \boldsymbol{y}= \)
\( 10 \sin \pi(0.01 x-2 \pi t) \) where \( y \) and \( x \) are
in \( c m \) and \( t \) in seconds. The maximum
transverse speed of a particle in the rope is about.
A. \( 63 \mathrm{cm} / \mathrm{s} \)
B. \( 75 \mathrm{cm} / \mathrm{s} \)
c. \( 100 \mathrm{cm} / \mathrm{s} \)
D. \( 121 \mathrm{cm} / \mathrm{s} \) | 3 | Physics |
In which one of the following compounds, the oxidation number of sulphur is the least
\( A \cdot S O_{2} \)
в. \( S O_{3} \)
\( \mathbf{c} \cdot N a_{2} S O_{4} \)
D. \( H_{2} S O_{4} \) | 1 | Chemistry |
\( \begin{array}{ll}\text { Appearance } & \begin{array}{l}\text { Reaction } \\ \text { with } \\ \text { dilute }\end{array} \\ & \boldsymbol{H C l}\end{array} \)
Unknown
metal #1 Dissolved
with
bubbles
of clear
gas Dull gray
solid with
white oxide
coating of
\( D \)
Unknow \( _{1 \# 2}^{\text {าown }} \) metal Solid;
lustrous,
smooth
silver-gray
surface No
reaction bub
of
gas
Identify the orange gas produced on the
addition of dilute \( H N O_{3} \) to unknown
metal #2.
\( \mathbf{A} \cdot C l_{2} \)
B. \( H_{2} \)
\( c \cdot O_{2} \)
D. \( C O_{2} \)
E \( . N O_{2} \) | 1 | Chemistry |
In above figure, a candle is placed in
front of the plane mirror. Points \( A, B, C, D \) and E are marked as shown in the
figure. Find out the possible point where image is formed.
\( A \cdot A \)
B. В
\( c \cdot c \)
\( D \cdot D \)
E. | 3 | Physics |
A solid conducting sphere of radius \( 2 R \)
carrying charge \( Q \) is surrounded by two
point charges \( Q \) and \( 2 Q \) as shown in the
figure. The electric field at point \( \boldsymbol{P} \) due
to the induced charge on conducting
sphere is
A \( \cdot \frac{7}{16} \frac{K Q}{R^{2}} \) towards right
B \( \cdot \frac{1}{8} \frac{K Q}{R^{2}} \) towards right
\( \mathrm{C} \cdot \frac{\mathrm{KQ}}{\mathrm{R}^{2}} \) towards right
D. Zero | 3 | Physics |
The line \( \mathbf{L} \) given by \( \frac{\mathbf{x}}{\mathbf{5}}+\frac{\mathbf{y}}{\mathbf{b}}=\mathbf{1} \) passes
through the point \( (13,32) . \) If the line \( \mathbf{K} \) is parallel to L and has the equation \( \frac{\mathbf{x}}{\mathbf{c}}+\frac{\mathbf{y}}{\mathbf{3}}=\mathbf{1}, \) then the distance between
\( \mathbf{L} \) and \( \mathbf{K} \) is
A. \( \sqrt{17} \)
в. \( \frac{17}{\sqrt{15}} \)
c. \( \frac{23}{\sqrt{17}} \)
D. \( \frac{23}{\sqrt{15}} \) | 2 | Maths |
Which of the following state of an ecosystem helps it to avoid changes?
A. Homeostasis
B. Shortage of components
c. Deficiency of light
D. Imbalance | 0 | Biology |
How meiosis differs from mitosis? | 0 | Biology |
Which of the following is safest way to protect yourself from lightning?
A. Run to an open field
B. Open an umbrella for cover
c. Take shelter under trees
D. Squat low on ground | 3 | Physics |
Write short note on catenation. | 1 | Chemistry |
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is-
\( A \cdot \frac{1}{2} \)
B. \( \frac{1}{4} \)
\( c \cdot \frac{1}{3} \)
D. 2 | 3 | Physics |
Two particles of mass \( 1 k g \) and \( 0.5 k g \) are moving in the same direction with
speed of \( 2 m / \) sec and \( 6 m / \)sec
respectively on a smooth horizontal surface. Find the speed of centre of mass of the system | 3 | Physics |
Anastral mitosis can be traced in
A. Invertebrates
B. Vertebrates
c. Both A and B
D. Plant cells | 0 | Biology |
Match column I and column II and
select the correct answer using the
codes given below: | 1 | Chemistry |
Find the distance between the pairs of points whose cartesian coordinates are (2,3,-1),(2,6,2)
A. \( 3 \sqrt{2} \)
B. \( 2 \sqrt{3} \)
\( c \cdot 5 \sqrt{2} \)
D. \( 2 \sqrt{5} \) | 2 | Maths |
Q Type your question
IOr \( 1.00 \times 10 \). \( \kappa g \) or oxygen gas at two
different temperatures.
(a) What does the dotted plot signify?
(b) Which is true \( : T_{1}>T_{2} \) or \( T_{1}<T_{2} ? \)
(c) What is the value of PV / T where the
curves meet on the y-axis?
(d) If we obtained similar plots for
\( 1.00 \times 10^{-3} k g \) of hydrogen, would we
get the same value of PV/T at the point
where the curves meet on the y-axis? If
not, what mass of hydrogen yields the
same value of PV/T (for low pressure
high temperature region of the plot)?
(Molecular mass of \( \boldsymbol{H}_{2}=\mathbf{2 . 0 2} \boldsymbol{u}, \) of
\( O_{2}=32.0 u, R=8.31 J m o l^{-1} K^{-1} . \) | 1 | Chemistry |
A converging lens of focal length \( 15 \mathrm{cm} \) and a converging mirror of focal length
\( 20 c m \) are placed with their principal
axis coinciding. A point source \( S \) is
placed on the principal axis at a
distance of \( 12 \mathrm{cm} \) from the lens as
shown in the figure. It is found that the final beam comes out parallel to the principal axis. Find the separation between the mirror and the lens. | 3 | Physics |
When the following bodies of same radius starts rolling down on same inclined plane, identify the decreasing order of their time of descent:
I) Solid cylinder
II) Hollow cylinder
III) Hollow sphere
IV) Solid sphere
A. \( I V, I, I I I, I I \)
в. \( I I, I I I, I, I V \)
c. \( I, I V, I I I, I I \)
D. II, III, IV, | 3 | Physics |
Which one of the following is a compound?
A. The black residue left when sugar is charred
B. Nitrogen gas
c. Air
D. carbon dioxide | 1 | Chemistry |
Anhydrous \( A l C l_{3} \) is covalent. from the
data given below Lattice Energy \( =5137 \mathrm{KJ} \) mol\( ^{-1} \)
\( \triangle \boldsymbol{H} \) hydration \( \boldsymbol{A l}^{3+}= \)
\( -4665 K J / m o l^{-1} \)
\( \triangle \boldsymbol{H} \) hydration \( \boldsymbol{C l}^{-}= \)
\( -381 K J / m o l^{-1} \)
Identify the correct statement-
A. It will remain covalent in aqueous solution
B. The solution will consists of \( A I^{3+} \) and \( C I^{-} \)
c. The solution will consists of hydrate \( A I^{3+} \) and \( C I^{-} \)
D. None of these | 1 | Chemistry |
The electricity produced by creating photo electrons is called:
A. Photoelectricity
B. Static electricity
c. Thermal electricity
D. Piezoelectricity | 3 | Physics |
What tube is used by both the digestive and respiratory systems?
A. Esophagus
B. Larynx
c. Pharynx
D. None of these. | 0 | Biology |
Find the position of center of mass of
the uniform planner section shown in
figure with respect to the origin (0) | 3 | Physics |
Given that carbon \( 14\left(C_{14}\right) \) decays at a
constant rate in such a way that it
reduces to \( 50 \% \) in 5568 years. Find the age of an old wooden piece in the carbon
is only \( 12 \frac{1}{2} \% \) of the original. | 2 | Maths |
Which of the following is not a unit of time?
A. Mean solar day
B. Lunar Month
C. Calendar year
D. Light year | 3 | Physics |
The sum of mole fractions of solute and
solvent of a solution is equal to:
A. number of moles of solute
B. number of moles of solvent
c. number of mole of solution
D. unity | 1 | Chemistry |
\( f\left(a-b=3 \text { and } a b=10, \text { find } a^{3}-b^{3}=\right. \) | 2 | Maths |
How many numbers can be formed by using all the digits 1,2,3,4,3,2,1 so that the odd digits always occupy the odd places?
A . 16
B. 17
c. 18
D. 20 | 2 | Maths |
In the figure,two 4 -digit numbers are to be formed by filling the places with digits. The number of different ways in which the places can be filled by digits so that the sum of the numbers formed
is also a 4 -digit number and in no place the addition is with carrying, is
\( \mathbf{A} \cdot 55^{4} \)
B. 220
\( c \cdot 45^{4} \)
D. none of these | 2 | Maths |
\( 4_{1} H^{1} \rightarrow_{2} H e^{4}+2_{+1} e^{0}+ \)energy
Energy released in this process is [lt is
\( \operatorname{given} 4_{1} H^{1}=4.031300 \mathrm{amu},_{2} H e^{4}= \)
\( \left.4.0026603 \text { amu, } 2_{1} e^{0}=0.01098 \text { amu }\right] \)
A . 14 Mev
B. 16.45 Mev
c. 37.2 Mev
D. \( 32.7 \mathrm{Mev} \) | 3 | Physics |
Hydrogen bomb is based on
A. controlled chain reaction
B. uncontrolled chain reaction
c. nuclear fusion
D. nuclear fission | 3 | Physics |
Which of the following is not in uniform
motion?
A. A bullet travelling with a constant speed in a straight line
B. A swinging pendulum
c. The earth rotating about its axis
D. Both B \& C | 3 | Physics |
\( \operatorname{Let} z=\frac{(1+i)^{2}}{a-i},(a>0) \) and \( |z|=\sqrt{\frac{2}{5}} \)
then \( \bar{z} \) is equal to
A. \( -\frac{1}{5}-\frac{3 i}{5} \)
в. \( \frac{1}{5}+\frac{3 i}{5} \)
\( c \cdot \frac{3}{5}-\frac{1 i}{5} \)
D. \( -\frac{3}{5}+\frac{1 i}{5} \) | 2 | Maths |
Explain the working of a diode as a half wave rectifier. | 3 | Physics |
Vexillum is found in
A . Rosaceae
B. Papilionaceae
c. Cruciferae
D. Solanaceae | 0 | Biology |
Assertion
It is possible to accelerate even if you are travelling at constant speed.
Reason
In the uniform circular motion, even if the particle has the constant speed, it
has an acceleration.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect | 3 | Physics |
If 7 times the \( 7^{t h} \) term of an \( A . P \geq 11 \)
times its \( 11^{t h} \) term, then find its \( 18^{t h} \)
term. | 2 | Maths |
Marks obtained by four students are \( : 25,35,45,55 . \) The average deviations from the mean is
A . 10
B. 9
c. 7
D. none of these | 2 | Maths |
Potential energy of a current loop placed inside some magnetic field does not depend upon magnetic moment of the
loop.Enter 1 if True and 0 if False. | 3 | Physics |
The position of an object moving along \( x \) -axis is given by \( x=a+b t^{2}, \) where \( a= \)
\( 8.5 \mathrm{m} \) and \( \mathrm{b}=2.5 \mathrm{m} \mathrm{s}^{-2} \) and \( \mathrm{t} \) is
measured in seconds. The
instantaneous velocity of the object at \( t \)
\( =2 \operatorname{sis} \)
A \( \cdot 5 \mathrm{m} s^{-1} \)
B. \( 10 \mathrm{m} s^{-1} \)
c. \( 15 \mathrm{m} \mathrm{s}^{-1} \)
D. 20 \( \mathrm{m} \mathrm{s}^{-1} \) | 3 | Physics |
Find the area of the figure bounded by the following curves
\( y=\sin x_{2}, y=2 x / \pi \) | 2 | Maths |
The imaginary roots of the equation \( \left(x^{2}+2\right)^{2}+8 x^{2}=6 x\left(x^{2}+2\right) \) are
A. \( 1+i \)
в. \( 2 \pm i \)
c. \( -1 \pm i \)
D. noneofthese | 2 | Maths |
If \( [A] \neq 0 \) then which of the following is
not true?
A \( \cdot\left(A^{2}\right)^{-1}=\left(A^{-1}\right)^{2} \)
B. \( \left(A^{\prime}\right)^{-1}=\left(A^{-1}\right)^{\prime} \)
\( \mathbf{c} \cdot A^{-1}=|A|^{-1} \)
D. None of these | 2 | Maths |
The first four terms of an \( A . P . \) whose
first term is 2 and the common
difference is 2 are:
B. 2,4,8,16
\( \mathrm{c} .2,4,6,8 \)
D. 2,5,8,11 | 2 | Maths |
Heat is transmitted from higher to lower
temperature through actual mass motion of the molecules in
A. conduction
B. convection
c. radiation
D. None of these | 3 | Physics |
From a point in the interior of an equilateral triangle, perpendiculars are drawn on the three sides. The lengths of the perpendiculars are \( 14 \mathrm{cm}, 10 \mathrm{cm} \) and \( 6 \mathrm{cm} \)
The area of the triangle is \( 300 \sqrt{m} \mathrm{cm}^{2} \)
where \( m \) is | 2 | Maths |
In the given reaction, (A) is:
is
A. \( C H_{3} C H O \)
в. \( C H_{3} C H_{2} \) ОН
c. \( C H_{2}=C H_{2} \)
D.
\[
\begin{array}{l}
C H_{2}-O H \\
C H_{2}-O H
\end{array}
\] | 1 | Chemistry |
The vector equation of the plane passes through the points \( A \& B \) with position vector \( 2 \hat{i}+\hat{j}-\hat{k} \&-\hat{i}+3 \hat{j}+4 \hat{k} \)
respectively \( \& \) Ler to the plane \( \bar{r} \cdot(\hat{i}-2 \hat{j}+4 \hat{k})=10 \) is
A \( \cdot \bar{r} \cdot(18 \hat{i}+17 \hat{j}-3 \hat{k})=49 \)
B . \( \bar{r} .(18 \hat{i}-17 \hat{j}-3 \hat{k})+22=0 \)
c. \( \bar{r} .(18 \hat{i}+17 \hat{j}+4 \hat{k})=25 \)
D・ \( \bar{r} .(18 \hat{i}+17 \hat{j}+4 \hat{k})=24 \) | 2 | Maths |
The temperature of the slag zone in the
metallurgy of iron using the blast furnace is:
\( 1.800-1000^{\circ} C \)
\( 2.500-700^{\circ} C \)
\( 3.1200-1500^{\circ} \mathrm{C} \)
Select the correct one from the given options. | 1 | Chemistry |
An organic compound was used with sodium metal and extracted with
distilled water. On adding freshly
prepared \( F e S O_{4} \) solution followed by
the addition of \( F e C l_{3} \) and dil. \( H C l \)
produced a greenish blue solution. \( 0.30 \mathrm{g} \) of the organic compound after Kjeldahlisation evolved a gas \( (\boldsymbol{X}) \)
which was passed on \( 100 \mathrm{ml} \) of \( 0.1 \mathrm{M} \)
\( H_{2} S O_{4} . \) The excess of acid required 20
\( \mathrm{ml} \) of \( 0.5 \mathrm{M} \) NaOH for neutralization.
The organic compound which suitably fits into the above data is:
\( A \)
\( C H_{3}-C-N H_{2} \)
в. \( C_{6} H_{5}-\stackrel{\|}{C}-N H_{2} \)
c. \( H_{2} N-C-N H_{2} \)
D. \( H_{2} N-\stackrel{\|}{C}-N H_{2} \) | 1 | Chemistry |
Light is a form of energy that causes sensation of warmth or coldness
A. True
B. False | 3 | Physics |
What are the peculiarities of the series
\( \boldsymbol{C H}_{4}, \boldsymbol{C}_{2} \boldsymbol{H}_{6}, \boldsymbol{C}_{3} \boldsymbol{H}_{8}, \boldsymbol{C}_{4} \boldsymbol{H}_{10}-_{--}-_{-} \) etc?
Write the general formula of these compounds. | 1 | Chemistry |
A negatively charged ion is known as
A. anion
B. cation
c. positron
D. non of these | 1 | Chemistry |
Explain why you can hear two people talking even when they walk around a
corner. | 3 | Physics |
Find \( \mathbf{S}, \) where \( \boldsymbol{S}=\frac{[\boldsymbol{n}(\boldsymbol{n}+\mathbf{1})(\boldsymbol{2} \boldsymbol{n}+\mathbf{1})]}{\mathbf{6}} \)
and \( n=20 \)
A . 2780
в. 2870
c. 1460
D. 1870 | 2 | Maths |
If \( \angle A \) and \( \angle B \) are acute angles such
that \( \cos A=\cos B, \) then show that \( \angle \boldsymbol{A}=\angle \boldsymbol{B} \) | 2 | Maths |
Study the four statements, a-d, given
below and select the two correct ones
out of them.
(a) Definition of biological species was
given by Ernst Mayr.
(b) Photoperiod does not affect reproduction in plants.
(c) Binomial nomenclature system was
given by R.H. Whittaker.
(d) In unicellular organisms
reproduction is synonymous with growth.
\( A \cdot \) a and \( b \)
B. b and c
c. \( c \) and \( d \)
D. a and d | 0 | Biology |
Which of the following is the strongest reducing agent in aqueous medium?
\( \mathbf{A} \cdot M g \)
в. \( N a \)
\( c \cdot L i \)
D. \( C a \) | 1 | Chemistry |
Write the names of two important substances used in the preparation of
soap? | 1 | Chemistry |
Place the elements of the following sets
in the proper location on the given Venn
diagram.
\( \boldsymbol{U}=\{\mathbf{5}, \mathbf{6}, \mathbf{7}, \mathbf{8}, \mathbf{9}, \mathbf{1 0}, \mathbf{1 1}, \mathbf{1 2}, \mathbf{1 3}\} \)
\( M=\{5,8,10,11\}, N=\{5,6,7,9,10\} \) | 2 | Maths |
Assertion: Diborane has two types
of hydrogens.
Reason : By methylation only four hydrogen atoms of diborane are substituted forming \( M e_{4} B_{2} H_{2} \)
A. Both Assertion and Reason are true and Reason is correct explanation of Assertion
B. Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
c. Assertion is true but Reason is false
D. Assertion is false but Reason is true | 1 | Chemistry |
The main waste which passes into the dialysing solution of a dialysis machine is
A. Cellulose
B. Glucose
c. water
D. urea | 0 | Biology |
Equation of plane parallel to z-axis.
\( \mathbf{A} \cdot a x+b y+d=0 \)
B. \( b x+c z+d=0 \)
c. \( b y+c z+d=0 \)
D. None of these | 2 | Maths |
Forests are called the lungs of the earth.
Why? | 0 | Biology |
Telomerase is an enzyme which is a
A. simple protein
B. RNA
c. Ribonucleoprotein
D. Repetitive DNA | 0 | Biology |
A body of mass \( m \) is moving with constant velocity v along a line parallel to x-axis. The angular momentum with respect to origin.
A. Remains constant
B. Is zero
c. Goes on decreasing
D. Goes on increasing | 3 | Physics |
Yellow brittle solid (A) gives a colourless \( \operatorname{gas}(B) \) on heating in air. \( B \) on heating in the
presence of oxygen gives gas \( \mathrm{C} \). \( \mathrm{C} \) is dissolved in D to form E. E on dilution
with water gives
D. B when dissolved in alkali 'F' gives
salt G.
From the above information answer the
following questions.
Write the balanced equations for \( B \) to G.
A. \( S O_{2}+2 N a O H \rightarrow N a_{2} S O_{3}+H_{2} O \)
в. \( 2 S O_{2}+O_{2} \rightarrow 2 S O_{3} \)
\( \mathrm{c} \cdot \mathrm{SO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{H}_{2} \mathrm{S}_{2} \mathrm{O}_{7} \)
D. \( H_{2} S_{2} O_{7}+H_{2} O \rightarrow 2 H_{2} S O_{4} \) | 1 | Chemistry |
In the complex \( \left[\boldsymbol{F e}\left(\boldsymbol{H}_{2} \boldsymbol{O}\right)_{6}\right]^{3+} \)
\( \left[\boldsymbol{F e}(\boldsymbol{S C N})_{6}\right]^{3-},\left[\boldsymbol{F e}\left(\boldsymbol{C}_{2} \boldsymbol{O}_{4}\right)_{3}\right]^{3-} \) and
\( \left[\boldsymbol{F} e C l_{6}\right]^{3-}, \) more stability is shown by :
\( \mathbf{A} \cdot\left[F e\left(H_{2} O\right)_{6}\right]^{3} \)
в. \( \left[F e(S C N)_{6}\right]^{-3} \)
\( \mathbf{c} \cdot\left[F e\left(C_{2} O_{4}\right)_{3}\right]^{3-} \)
D. \( \left[F e C l_{6}\right]^{3-} \) | 1 | Chemistry |
Newland could classify elements only
upto:
A. copper
B. chlorine
c. calcium
D. chromium | 1 | Chemistry |
A ray of white light is incident on a
spherical Water drop whose center is
as shown below when observed from the
opposite side, the emergent light
A. will be white and will emerge without deviating
B. will be internally reflected
C. will split into different colors such that the angles of deviation will be different for different colors
D. will split into different colors such that the angles of deviation will be same for all colors | 3 | Physics |
In the known interhalogen compounds, the maximum number of halogen atom
is: | 1 | Chemistry |
Photorespiration and photosynthesis both require
A. Organic fuel
B. Chlorophyll
c. cytochromes
D. Energy | 0 | Biology |
Find \( \frac{d y}{d x} \)
\( \left(x^{3}-2 y^{3}\right) d x+3 x y^{2} d y=0 \) | 2 | Maths |
Prove that: \( \left|\begin{array}{ccc}\boldsymbol{b}+\boldsymbol{c} & \boldsymbol{a} & \boldsymbol{b} \\ \boldsymbol{c}+\boldsymbol{a} & \boldsymbol{c} & \boldsymbol{a} \\ \boldsymbol{a}+\boldsymbol{b} & \boldsymbol{b} & \boldsymbol{c}\end{array}\right|=(\boldsymbol{a}+\boldsymbol{b}+ \)
\( c)(a-c)^{2} \) | 2 | Maths |
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