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Recent questions tagged 47
Questions
Increase in temperature of a gas filled in a container would lead to :
neet
physics
past papers
2019
47
asked
Jul 8, 2019
by
pady_1
1
answer
Among electron, proton, neutron and $\alpha$-particle the maximum penetraion capacity is for :
jeemain
physics
past papers
1998
47
asked
Dec 19, 2018
by
pady_1
0
answers
In a nuclear reactor, material used for control rods is :
jeemain
physics
past papers
1999
47
asked
Dec 19, 2018
by
pady_1
0
answers
The frequency of a stretched uniform wire under tension is in resonance with the fundamental frequency of a closed tube. If the tension in the wire is increased by 8 N, it is in resonance with the first over-tone of the closed tube. The initial tension in the wire is :
jeemain
physics
past papers
2000
47
asked
Dec 19, 2018
by
pady_1
0
answers
A mercury drop of radius 1 cm is sprayed into $10^6$ drop of equal size. The energy expanded in joules is : <br> (Surface tension of mercury is $460 \times 10^{-3} N/m$)
jeemain
physics
past papers
2001
47
asked
Dec 11, 2018
by
pady_1
0
answers
Initial angular velocity of a circular disc of mass $M$ is $\omega_1$. Then two small spheres of mass $m$ are attached gently to two diametrically opposite point on the edge of the disc. What is the final angular velocity of the disc ?
jeemain
physics
past papers
2002
47
asked
Dec 11, 2018
by
pady_1
0
answers
Which of the following cannot be emitted by radioactive substances during their decay ?
jeemain
physics
past papers
2003
47
asked
Dec 11, 2018
by
pady_1
0
answers
A straight line through a fixed point $(2, 3)$ intersects the coordinate axes at distinct points P and Q. If O is the origin and the rectangle OPRQ is completed, then the locus of R is
jeemain
math
past papers
2018
47
asked
Dec 11, 2018
by
pady_1
1
answer
<br> In the above circuit the current in each resistance is :
jeemain
physics
past papers
2017
47
asked
Dec 11, 2018
by
pady_1
0
answers
Which of the following compounds is metallic and ferromagnetic ?
jeemain
chemistry
past papers
2016
47
asked
Dec 11, 2018
by
pady_1
0
answers
An aqueous solution of a salt $X$ turns blood red on treatment with $SCN^-$ and blue on treatment with $K_4 [Fe(CN)_6 ]$. $X$ also gives a positive chromyl chloride test. The salt $X$ is :
jeemain
chemistry
past papers
2015
47
asked
Dec 11, 2018
by
pady_1
1
answer
If f and g are differentiable functions in $[0, 1]$ satisfying $f(0) = 2 = g(1), g(0) = 0 $ and $f(1) = 6$, then for some $c \in ]0, 1[$
jeemain
math
past papers
2014
47
asked
Dec 11, 2018
by
pady_1
1
answer
Let $T_n$ be the number of all possible triangles formed by joining vertices of an n-sided regular polygon. If $T_{n+1} - T_n = 10$, then the value of $n$ is
jeemain
math
past papers
2013
47
asked
Dec 11, 2018
by
pady_1
1
answer
A thin liquid film formed between a U-shaped wire and a light slider supports a weight of $1.5 \times 10^{-2}N$ (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is <br>
jeemain
physics
past papers
2012
47
asked
Dec 11, 2018
by
pady_1
0
answers
Let $I$ be the purchase value of an equipment and $V(t)$ be the value after it has been used for $t$ years. The value $V(t)$ depreciates at a rate given by diferential equation $\frac{dV(t)}{dt} = -k(T-t)$, where $k>0$ is a constant and $T$ is the total life in years of the equipment. Then the scrap value $V(T)$ of the equipment is
jeemain
math
past papers
2011
47
asked
Dec 11, 2018
by
pady_1
0
answers
The respective number of significant figures for the numbers $23.023, 0.0003$ and $2.1 \times 10^{–3}$ are
jeemain
physics
past papers
2010
47
asked
Dec 11, 2018
by
pady_1
0
answers
Solid $Ba(NO_3)_2$ is gradually dissolved in a $1.0 \times 10^{-4} M\; Na_2CO_3$ solution. At what concentration of $Ba^{2+}$ will a precipitate begin to form ? ($K_{sp}$ for $BaCO_3 = 5.1 \times 10^{-9} $ ).
jeemain
chemistry
past papers
2009
47
asked
Nov 29, 2018
by
pady_1
0
answers
Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below: <br> $\large\frac{1}{2}$$ Cl_2(g) \underrightarrow{\qquad \frac{1}{2} \Delta {diss} H^{-} \qquad } Cl(g) \underrightarrow{\qquad \Delta {eg} H^{-}\qquad} Cl^{-}(g) \underrightarrow{\qquad \Delta _{hyd} H^{-}\qquad } Cl^{-}(aq)$ <br> The energy involved in the conversion of $\frac{1}{2}Cl_2(g) to Cl^{-}(g)$ <br> (using the data ,<br> $\Delta_{diss}H^{\Theta}_{Cl_2}=240 KJmol^{-1}$ ,$\Delta_{eg}H^{\Theta}_{Cl}=-349 KJmol^{-1}$ , $\Delta_{hyd}H^{\Theta}_{Cl}=-381 KJmol^{-1}$)
jeemain
chemistry
past papers
2008
47
asked
Nov 29, 2018
by
pady_1
0
answers
A current $I$ flows along the length of an infinitely long, straight, thin walled pipe. Then :
jeemain
physics
past papers
2007
47
asked
Nov 29, 2018
by
pady_1
0
answers
A thin circulr ring of mass m and radius R is rotating about its axis with a constant angular velocity $\omega$. Two objects each of mass M are attached gently to the opposite ends of a diameter of the ring. The ring now rotates with an angular velocity $\omega'$.
jeemain
physics
past papers
2006
47
asked
Nov 13, 2018
by
pady_1
0
answers
If non-zero numbers $a, b, c$ are in HP, then the straight line $\frac{x}{a} +\frac{y}{b} + \frac{1}{c} = 0$ always passes through a fixed point. That point is :
jeemain
math
past papers
2005
47
asked
Nov 5, 2018
by
pady_1
0
answers
A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 V, the resistance in Ohm's needed to be connected in series with the coil will be :
jeemain
physics
past papers
2005
47
asked
Nov 5, 2018
by
pady_1
0
answers
If the sum of the slopes of the lines given by $x^2 - 2cxy -7y^2 =0$ is four times their product, then $c$ has the value
jeemain
math
past papers
2004
47
asked
Nov 5, 2018
by
pady_1
0
answers
The diffrence between amylose and amylopectin is
neet
chemistry
past papers
2018
47
asked
Aug 21, 2018
by
pady_1
1
answer
The vascular cambium normally gives rise to :
neet
botany
past papers
2017
47
asked
Aug 21, 2018
by
pady_1
1
answer
The coconut water from tender coconut represents :
neet
botany
past papers
2016
47
asked
Aug 21, 2018
by
pady_1
1
answer
Which one is a wrong statement ?
neet
botany
past papers
2015
47
asked
Aug 21, 2018
by
pady_1
2
answers
Calculate the energy in corresponding to light of wavelength 45nm : (Planck's constant $h = 6.63 \times 10^{-34} Js$ : speed of light $c = 3 \times 10^8 ms^{-1}$)
neet
chemistry
past papers
2014
47
asked
Aug 20, 2018
by
pady_1
1
answer
What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ? <br> n = 3, l = 1 and m = -1
neet
chemistry
past papers
2013
47
asked
Aug 20, 2018
by
pady_1
2
answers
The figure shown a logic circuit with two inputs A and B and the output C. The voltage wave farms across A, B and C are given. The logic circuit gate is <br>
neet
physics
past papers
2012
47
asked
Aug 20, 2018
by
pady_1
1
answer
A transistor is operated in common emitter configuration at $V_C = 2V$ such that a change in the base current from 100 µA to 300 µA produces a change in the collector current from 10 mA to 20 mA. The current gain is :
neet
physics
past papers
2011
47
asked
Aug 16, 2018
by
pady_1
1
answer
Electromagnets are made of soft iron because soft iron has –
neet
physics
past papers
2010
47
asked
Jul 26, 2018
by
pady_1
1
answer
Sodium has body centred packing. Distance between two nearest atoms is 3.7 Å. The lattice parameter is :
neet
physics
past papers
2009
47
asked
Jul 26, 2018
by
pady_1
1
answer
A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is 20m. The speed of the car at the top of the hill i between -
neet
physics
past papers
2008
47
asked
Jul 26, 2018
by
pady_1
1
answer
In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is :- <img src""/>
neet
physics
past papers
2007
47
asked
Jul 26, 2018
by
pady_1
1
answer
A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ?. The force exerted by the liquid at the other ends is:-
neet
physics
past papers
2006
47
asked
Jul 25, 2018
by
pady_1
2
answers
The displacement x of a particle varies with time$x=ae^{-\alpha t}+be^{\beta t}$, where $a,b,\alpha$ and $\beta$ are positive constants. The velocity of the particle will -
neet
physics
past papers
2005
47
asked
Jul 24, 2018
by
pady_1
2
answers
A battery is charged at a potential of 15V for 8 hours when the current flowing is 10A. The battery on discharge supplies a current of 5A for 15 hours. The mean terminal voltage during discharges is 14 V. The "Watt hour" efficiency of the battery is :-
neet
physics
past papers
2004
47
asked
Jul 24, 2018
by
pady_1
2
answers
The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of $^4_2He$ is (Given : helium nucleus mass ≈ 4.0015 u)
neet
physics
past papers
2003
47
asked
Jul 24, 2018
by
pady_1
1
answer
Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similer poles are same side then its time period of osccilation is $T_1$ . Now the polarity of one of the magnet is reversed then time period of osccilation is $T_2$ , then : -
neet
physics
past papers
2002
47
asked
Jul 23, 2018
by
pady_1
0
answers
A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance become d/2, then number of electrons emited per second will be : -
neet
physics
past papers
2001
47
asked
Jul 20, 2018
by
pady_1
1
answer
The cations and anions are arranged in alternate form in :
neet
physics
past papers
2000
47
asked
Jul 20, 2018
by
pady_1
1
answer
Common emitter circuit is used as amplifier, its current gain is 50. If input resistance is 1 k$\Omega$ and input voltage is 5 volt then output current will be :
neet
physics
past papers
1998
47
asked
Jun 15, 2018
by
pady_1
1
answer
A group of science students went on a field trip. They took 4 vans and 8 buses. There were 4 people in each van and 23 people in each bus. How many people went on the field trip?
class5
math
olympiad
logical
analytical
reasoning
47
asked
Dec 31, 2015
by
pady_1
1
answer
Devon is ordering breakfast in a restaurant. She can have over-easy, hard boiled, or poached eggs. On the side, she can choose to have toast, hash browns, or pancakes. How many different combinations can Devon order for breakfast?
class5
math
olympiad
data handling
47
asked
Dec 31, 2015
by
pady_1
0
answers
The area of a rectangular dining room is 35 square metres. It is 7 metres long. How wide is it?
class5
math
olympiad
measurements
47
asked
Dec 31, 2015
by
pady_1
0
answers
Simplify $(7\large\frac{1}{4} - 6 \large\frac{1}{4})$ of $(\large\frac{2}{5} + \large\frac{3}{15})$
class5
math
olympiad
fractions
decimals
47
asked
Dec 31, 2015
by
pady_1
0
answers
The area of a circle is increased by 22 cm^2 when its radius is increased by 1 cm. What is the original radius of the circle?
class5
math
olympiad
computation
47
asked
Dec 31, 2015
by
pady_1
0
answers
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