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Recent questions tagged 1
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Under isothermal condition, a gas at 300 K expands from 0.1L to 0.25L against a constant external pressure of 2 bar. The work done by the gas is :- [Given that 1L bar = 100 J]
neet
chemistry
past papers
2019
1
asked
Jul 8, 2019
by
pady_1
1
answer
An iron block of sides $50\; cm \times 8 \; cm \times 15\; cm $ has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is :
jeemain
physics
past papers
1998
1
asked
Dec 19, 2018
by
pady_1
0
answers
Two particles of mass 1 kg and 3 kg have position vectors $2 \hat{i} + 3\hat{j} + 4 \hat{k}$ and $-2 \hat{i} + 3 \hat{j} - 4 \hat{k}$ respectively.
jeemain
physics
past papers
1999
1
asked
Dec 19, 2018
by
pady_1
0
answers
Two long parallel copper wires carrying currents in the opposite directions of 5 A each. If the wires are separated by a distance of $0.5\;m$, then the force per unit length between the two wires is :
jeemain
physics
past papers
2000
1
asked
Dec 19, 2018
by
pady_1
0
answers
A nichrome wire $50\; cm$ long and $1 \; mm^2$ cross-section carries a current of $4\;A$. When connected to $2$ volt battery. The resistivity of nichrome with in $\Omega^{-m}$ is :
jeemain
physics
past papers
2001
1
asked
Dec 11, 2018
by
pady_1
0
answers
The inductance between A and D is : <br>
jeemain
physics
past papers
2002
1
asked
Dec 11, 2018
by
pady_1
0
answers
A particle of mass $M$ and charge $Q$ moving with velocity $\overrightarrow{v}$ describes a circular path of radius $R$ when subjected to a uniform transverse magnetic field of induction $B$. The work done by the field when the particle completes one full circle is :
jeemain
physics
past papers
2003
1
asked
Dec 11, 2018
by
pady_1
0
answers
It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is $p_d$, while for its similar collision with carbon nucleus at rest, fractional loss of energy is $p_c$. The values of $p_d$ and $p_c$ are respectively :
jeemain
physics
past papers
2018
1
asked
Dec 11, 2018
by
pady_1
0
answers
If S is the set of distinct values of 'b' for which of the following system of linear equations <br> $x + y + z = 1$ <br> $x + ay + z = 1$ <br> $ax + by + z = 0$ <br> has no solution, then S is :
jeemain
math
past papers
2017
1
asked
Dec 11, 2018
by
pady_1
1
answer
A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s, 91 s, 95 s and 92 s. If the minimum division in the measuring clock is 1 s, then the reported mean time should be :
jeemain
physics
past papers
2016
1
asked
Dec 11, 2018
by
pady_1
0
answers
$x$ and $y$ displacements of a particle are given as $x(t) = a \sin \omega t$ and $y(t) = a \sin 2 \omega t$. Its trajectory will look like :
jeemain
physics
past papers
2015
1
asked
Dec 11, 2018
by
pady_1
0
answers
The pressure that has to be applied to the ends of a steel wire of length 10 cm to keep its length constant when its temperature is raised by $100^{\circ}C$ is : <br> (For steel Young’s modulus is $2 \times 10^{11} N m^{–2}$ and coefficient of thermal expansion is $1.1 \times 10^{–5} K^{–1}$ )
jeemain
physics
past papers
2014
1
asked
Dec 11, 2018
by
pady_1
0
answers
An unknown alcohol is treated with the "Lucas reagent" to determine the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism :
jeemain
chemistry
past papers
2013
1
asked
Dec 11, 2018
by
pady_1
0
answers
The equation $e^{\sin x }- e^{- \sin x} - 4 = 0 $ has
jeemain
math
past papers
2012
1
asked
Dec 11, 2018
by
pady_1
1
answer
The transverse displacement $y(x,t)$ of a wave on a string is given by $y (x,t) = e^{-(ax^2 + bx^2 + 2 \sqrt{ab}\; xt)}$. This represents a
jeemain
physics
past papers
2011
1
asked
Dec 11, 2018
by
pady_1
0
answers
The standard enthalpy of formation of $NH_3$ is $–46.0\; kJ mol^{–1}.$ If the enthalpy of formation of $H_2$ from its atoms is $–436\; kJ mol^{–1}$ and that of $N_2$ is $–712\; kJ mol^{–1},$ the average bond enthalpy of $N–H$ bond in $NH_3$ is
jeemain
chemistry
past papers
2010
1
asked
Dec 11, 2018
by
pady_1
0
answers
This question contains Statement - 1 and Statement - 2. Of the four choices given after the statements, choose the one that best describes the two statements. <br> Statement - 1 : For a charged particle moving from point P to point Q, the net work done by an electrostatic field on the particle is independent of the path connecting point P to point Q. <br> Statement -2 : The net work done by a conservative force on an object moving along a closed loop is zero.
jeemain
physics
past papers
2009
1
asked
Nov 29, 2018
by
pady_1
0
answers
AB is a vertical pole with B at the ground level and A at the top. A man finds that the angle of elevation of the point A from a certain point C on the ground is $60^\circ$. He moves away from the pole along the line BC to a point D such that CD = 7 m. From D the angle of elevation of the point A is $45^\circ$. Then the height of the pole is
jeemain
math
past papers
2008
1
asked
Nov 29, 2018
by
pady_1
0
answers
In a geometric progression consisting of positive terms, each term equals the sum of the next two terms. Then the common ratio of this progression equals :
jeemain
math
past papers
2007
1
asked
Nov 29, 2018
by
pady_1
0
answers
The Kirchhoff's first law $(\sum i =0)$ and second law $(\sum i R = \sum E)$, <br> where the symbols have their usual meanings, are respectively based on :
jeemain
physics
past papers
2006
1
asked
Nov 13, 2018
by
pady_1
0
answers
If $C$ is the mid point of AB and P is any point outside AB, then :
jeemain
math
past papers
2005
1
asked
Nov 5, 2018
by
pady_1
0
answers
A projectile can have the same range R for two angles of projection. If $t_1$ and $t_2$ be the times of flights in the two cases, then the product of the two times of flights is proportional to :
jeemain
physics
past papers
2005
1
asked
Nov 5, 2018
by
pady_1
0
answers
Let $R = \{ (1,3), (4,2), (2,4), (2,3), (3,1) \}$ be a relation on the set $A = \{1, 2, 3, 4\}$. The relation R is
jeemain
math
past papers
2004
1
asked
Nov 5, 2018
by
pady_1
0
answers
The effciency of an ideal heat engine workong between the freezing point and boiling point of water, is
neet
physics
past papers
2018
1
asked
Aug 21, 2018
by
pady_1
1
answer
The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is :
neet
chemistry
past papers
2017
1
asked
Aug 21, 2018
by
pady_1
1
answer
The addition of a catalyst during a chemical reaction alters which of the following quantities ?
neet
chemistry
past papers
2016
1
asked
Aug 21, 2018
by
pady_1
2
answers
2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?
neet
chemistry
past papers
2015
1
asked
Aug 21, 2018
by
pady_1
1
answer
If force (F), velocity(V) and time (T) are taken as fundamental units, the dimensions of mass are
neet
physics
past papers
2014
1
asked
Aug 20, 2018
by
pady_1
1
answer
In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows : $P = \frac{a^3b^2}{cd} . \%$ error in P is :
neet
physics
past papers
2013
1
asked
Aug 20, 2018
by
pady_1
1
answer
The damping force on a oscillator is directly proportional to the velocity. The Unit of the constant of proportionality are
neet
physics
past papers
2012
1
asked
Aug 20, 2018
by
pady_1
1
answer
The dimension of $(\mu_o \epsilon_o)^{-1/2}$ are :
neet
physics
past papers
2011
1
asked
Aug 16, 2018
by
pady_1
1
answer
A block of mass m is in contact with the cart C as shown in figure :– The coefficient of static friction between the block and the cart is $\mu$. The acceleration $\alpha$ of the cart that will prevent the block from falling satisfies –
neet
physics
past papers
2010
1
asked
Jul 26, 2018
by
pady_1
1
answer
If the dimensions of a physical quantity are given by $[M^aL^bT^c]$, then the physical quantity will be:
neet
physics
past papers
2009
1
asked
Jul 26, 2018
by
pady_1
1
answer
A particle of mass m is projected with velocity v making an angle of $45^o$ with the horizontal from level ground. When the particle lands on the level ground the magnitude of the change in its momentum will be -
neet
physics
past papers
2008
1
asked
Jul 26, 2018
by
pady_1
1
answer
Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I, would be:-
neet
physics
past papers
2007
1
asked
Jul 26, 2018
by
pady_1
1
answer
In producing chlorine through electrolysis 100 watt power at 125V is being consumed. How much chlorine per minute is liberated ? E.C.E. of chlorine is $0.367\times 10^{–6}$ kg/coulomb:-
neet
physics
past papers
2006
1
asked
Jul 25, 2018
by
pady_1
1
answer
The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5eV. According to Einstein's equation, the metals which will emit photo electrons for a radiation of wavelength $4100 A^{\circ}$ is/are-
neet
physics
past papers
2005
1
asked
Jul 24, 2018
by
pady_1
1
answer
When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be :-
neet
physics
past papers
2004
1
asked
Jul 24, 2018
by
pady_1
1
answer
If a ball is thrown vertically upwards with speed u, the distance covered during the last ‘t’ seconds of its ascent is :
neet
physics
past papers
2003
1
asked
Jul 24, 2018
by
pady_1
1
answer
A mass is suspended separately by two different springs in successive order then time period is $t_1$ and $t_2$ respectively. If it is connected by both spring as shown in figure then time period is $t_0$, the correct relation is :
neet
physics
past papers
2002
1
asked
Jul 23, 2018
by
pady_1
1
answer
The dimension of Planck constant equals to that of :
neet
physics
past papers
2001
1
asked
Jul 20, 2018
by
pady_1
1
answer
Two masses as shown are suspended from a massless pulley. Calculate the acceleration of the system when masses are left free :
neet
physics
past papers
2000
1
asked
Jul 20, 2018
by
pady_1
1
answer
Boron has two isotopes $_5B^{10}$ and $_5B^{11}$. If atomic weight of Boron is 10.81 then ratio of $_5B^{10}$ to $_5B^{11}$ in nature will be :
neet
physics
past papers
1998
1
asked
Jun 15, 2018
by
pady_1
2
answers
How many lines of symmetry does a rectangle have?
class5
math
olympiad
data handling
1
asked
Dec 31, 2015
by
pady_1
1
answer
Find the area of a rectangle of length 17 cm and breadth 9 cm.
class5
math
olympiad
measurements
1
asked
Dec 31, 2015
by
pady_1
0
answers
Shweta's aunt lives 190 kilometers away from her house. When she wants to visit her aunt, she travels $\large\frac{7}{19}$ of this distance by train and the rest by bus. How many kilometers does she travels by bus?
class5
math
olympiad
fractions
decimals
1
asked
Dec 31, 2015
by
pady_1
0
answers
If 19 Kgs. of rice is required to make food for 437 people, then how many kilograms will be needed to make food for 1196 people?
class5
math
olympiad
computation
1
asked
Dec 31, 2015
by
pady_1
0
answers
Identify the quantifier and write the negation of the statement "There exists a number which is equal to its square."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q2
1
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
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