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Recent questions tagged 20
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The structure of intermediate A in the following reaction is :-
neet
chemistry
past papers
2019
20
asked
Jul 10, 2019
by
pady_1
1
answer
A glass flask of volume $200 \; cm^3$ is completely filled with mercury at $20^{\circ}C$. The amount of mercury that spilt over when the flask is heated to $80^{\circ}C$ is (coefficient of volume expansion for glass $27 \times 10^{-8} /^{\circ}C$, mercury $0.18 \times 10^{-8}/^{\circ}C$) :
jeemain
physics
past papers
1998
20
asked
Dec 19, 2018
by
pady_1
0
answers
Two simple pendulums of lengths $16 l$ and $l$ are in phase at the mean position at a certain time. If $T$ is the time period of shorter pendulum, the minimum time after which they will be again in phase :
jeemain
physics
past papers
1999
20
asked
Dec 19, 2018
by
pady_1
1
answer
Consider the following statements A and B and identify the correct choice of the given answers : <br> (A) The width of the depletion layer in a $p-n$ junction diode increases in forward bias. <br> (B) In a intrinsic semiconductor the fermi energy level in exactly in the middle of the forbidden energy gap.
jeemain
physics
past papers
2000
20
asked
Dec 19, 2018
by
pady_1
0
answers
A closed hollow insulated cylinder is filled with gas at $0^{\circ}C$ and also contain an insulated piston of negligible weight and negligible thickness at the middle point. The gas in one side of the piston is heated to $100^{\circ}C$. If the piston moves $5\; cm$. The length of the hollow cylinder is :
jeemain
physics
past papers
2001
20
asked
Dec 11, 2018
by
pady_1
0
answers
Wavelength of light used in optical instrument are $\lambda_1 = 4000 \mathring{A}$ and $\lambda_2 = 5000 \mathring{A}$, then ratio of their respective resolving powers (corresponding to $\lambda_1$ and $\lambda_2$) is :
jeemain
physics
past papers
2002
20
asked
Dec 11, 2018
by
pady_1
0
answers
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the :
jeemain
physics
past papers
2003
20
asked
Dec 11, 2018
by
pady_1
0
answers
The angular width of the central maximum in a single slit diffraction pattern is $60^{\circ}$. The width of the slit is $ 1\; \mu m$. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young's fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance? <br> (i.e. distance between the centres of each slit.)
jeemain
physics
past papers
2018
20
asked
Dec 11, 2018
by
pady_1
0
answers
$\displaystyle\lim_{x \to \frac{\pi}{2}} \frac{\cot x - \cos x}{(\pi - 2 x)^3}$ equals
jeemain
math
past papers
2017
20
asked
Dec 11, 2018
by
pady_1
1
answer
The box of a pin hole camera, of length L, has a hole of radius $a$. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength $\lambda$ the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say $b_{min}$) when :
jeemain
physics
past papers
2016
20
asked
Dec 11, 2018
by
pady_1
0
answers
A $25 \;cm$ long solenoid has radius $2\; cm$ and $500$ total number of turns. It carries a current of $15\; A$. If it is equivalent to a magnet of the same size and magnetization $\overrightarrow{M}$ (magnetic moment/volume), then $|\overrightarrow{M}|$ is :
jeemain
physics
past papers
2015
20
asked
Dec 11, 2018
by
pady_1
0
answers
Three rods of Copper, Brass and Steel are welded together to from a Y –shaped structure. Area of cross – section of each rod = $4\; cm^2$ . End of copper rod is maintained at $100^{\circ}C$ where as ends of brass and steel are kept at $0^{\circ}C$. Lengths of the copper, brass and steel rods are 46, 13 and 12 cms respectively. The rods are thermally insulated from surroundings except at ends. Thermal conductivities of copper, brass and steel are 0.92, 0.26 and 0.12 CGS units respectively. Rate of heat flow through copper rod is :
jeemain
physics
past papers
2014
20
asked
Dec 11, 2018
by
pady_1
0
answers
A gaseous hydrocarbon given upon combustion 0.72 g of water and 3.08 g of $CO_2$. The empirical formula of the hydrocarbon is :
jeemain
chemistry
past papers
2013
20
asked
Dec 11, 2018
by
pady_1
0
answers
If the lines $\frac{x-1}{2} = \frac{y+1}{3} = \frac{z-1}{4}$ and $ \frac{x-3}{1} = \frac{y-k}{2} = \frac{z}{1}$ intersect, then $k$ is equal to
jeemain
math
past papers
2012
20
asked
Dec 11, 2018
by
pady_1
1
answer
A resistor 'R' and $2 \mu F$ capacitor in series is connected through a switch to 200 V direct supply. Across the capacitor is a neon bulb that lights up at 120 V. Calculate the value of R to make the bulb light up 5 s after the switch has been closed. ($\log_{10} 2.5 = 0.4$)
jeemain
physics
past papers
2011
20
asked
Dec 11, 2018
by
pady_1
0
answers
The correct order of increasing basicity of the given conjugate bases $(R = CH_3)$ is
jeemain
chemistry
past papers
2010
20
asked
Dec 11, 2018
by
pady_1
0
answers
A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on Q is zero, tthen the Q/q equals
jeemain
physics
past papers
2009
20
asked
Nov 29, 2018
by
pady_1
0
answers
Let p be the statement “x is an irrational number”, q be the statement “y is a transcendental number”, and r be the statement “x is a rational number iff y is a transcendental number”.<br> Statement –1: r is equivalent to either q or p <br> Statement –2: r is equivalent to $\sim (p\leftrightarrow \sim q)$.
jeemain
math
past papers
2008
20
asked
Nov 29, 2018
by
pady_1
0
answers
If a line makes an angle of $\frac{\pi}{4}$ with the positive directions of each of $x-axis$ and $y-axis$, then the angle that the line makes with the positive direction of the $z-axis$ is :
jeemain
math
past papers
2007
20
asked
Nov 29, 2018
by
pady_1
0
answers
A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple i kept hot and the other is kept cold, then, an electrix current will :
jeemain
physics
past papers
2006
20
asked
Nov 13, 2018
by
pady_1
0
answers
If $a^2+b^2+c^2 = -2$ and $f(x) = \begin{vmatrix} 1+a^2x & (1+b^2)x & (1+c^2) x \\ (1+a^2)x & 1+b^2x & (1+c^2)x \\ (1+a^2)x & (1+b^2)x & 1+c^2x \end{vmatrix}$, then $f(x)$ is a polynomial of degree :
jeemain
math
past papers
2005
20
asked
Nov 5, 2018
by
pady_1
0
answers
Average density of the earth :
jeemain
physics
past papers
2005
20
asked
Nov 5, 2018
by
pady_1
0
answers
The sum of series $\frac{1}{2!} + \frac{1}{4!} + \frac{1}{6!}+... $ is
jeemain
math
past papers
2004
20
asked
Nov 5, 2018
by
pady_1
0
answers
In Young's double slit experiment the separation d between the slit is 2mm, the wavelength $\lambda$ of the light used is $5896 \; A^o$ and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is $0.20^o$. To increase the fringe angular width to $0.21^o$ ( with same $\lambda$ and D ) the separation between the slits needs to be changed to
neet
physics
past papers
2018
20
asked
Aug 21, 2018
by
pady_1
1
answer
A 20 litre container at 400 K contains $CO_2(g)$ at pressure $0.4\; atm$ and an excess of $SrO$ (neglect the volume of solid $SrO$). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of $CO_2$ attains its maximum value, will be : <br> (Given that : $SrCO_3 (s) \stackrel{K}\rightleftharpoons SrO (s) + CO_2 (g), Kp = 1.6 \; atm$ )
neet
chemistry
past papers
2017
20
asked
Aug 21, 2018
by
pady_1
1
answer
Which one of the following statements is correct when $SO_2$ is passed through acidified $K_2Cr_2O_7$ solution ?
neet
chemistry
past papers
2016
20
asked
Aug 21, 2018
by
pady_1
1
answer
If Avogadro number NA, is changed from $6.022 \times 10^{23} mol^{–1}$ to $6.022 \times 10^{20} \;mol^{–1}$, this would change :
neet
chemistry
past papers
2015
20
asked
Aug 21, 2018
by
pady_1
1
answer
If $n_1$, $n_2$ and $n_3$ are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by:
neet
physics
past papers
2014
20
asked
Aug 20, 2018
by
pady_1
1
answer
A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelength $2 \pi m$ and frequency of $\frac{1}{\pi}$ Hz is represented by :
neet
physics
past papers
2013
20
asked
Aug 20, 2018
by
pady_1
1
answer
If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q ?
neet
physics
past papers
2012
20
asked
Aug 20, 2018
by
pady_1
1
answer
The rate of increase of thermo - e.m.f. with temperature at the neutral temperature of a thermocouple :
neet
physics
past papers
2011
20
asked
Aug 16, 2018
by
pady_1
1
answer
The activity of a radioactive sample is measured as N0 counts per minute at t = 0 and N0/e counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is –
neet
physics
past papers
2010
20
asked
Jul 26, 2018
by
pady_1
2
answers
A simple pendulum performs simple harmonic motion about x = 0 with an amplitude a and time period T. The speed of the pendulum at $x=a/2$will be :
neet
physics
past papers
2009
20
asked
Jul 26, 2018
by
pady_1
1
answer
In the circuit shown, the current through the 4$\Omega$ resistor is 1 amp when the points P and M are connected to a D.C. voltage source. The potential difference between the points M and N is <br>
neet
physics
past papers
2008
20
asked
Jul 26, 2018
by
pady_1
1
answer
A particle executes simple harmonic oscillation with an amplitude a. The period of oscillation is T. The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is:
neet
physics
past papers
2007
20
asked
Jul 26, 2018
by
pady_1
1
answer
A transistor is operated in common emitter configuration at constant collector voltage $V_c = 1.5 V$ such that a change in the base current from 100 µA to 150 µA produces a change in the collector current from 5 mA to 10 mA. The current gain $\beta$ is:-
neet
physics
past papers
2006
20
asked
Jul 25, 2018
by
pady_1
1
answer
A photosensitive metallic surface has work function, $hv_0$. If photons of energy $2hv_o$ fall on this surface, the electrons come out with a maximum velocity of $4\times10^6$ m/s. When the photon energy is increased to $5hv_0$, then maximum velocity of photo electrons will be
neet
physics
past papers
2005
20
asked
Jul 24, 2018
by
pady_1
1
answer
A nucleus represented by the symbol $_{Z}^{A}X$ has :-
neet
physics
past papers
2004
20
asked
Jul 24, 2018
by
pady_1
1
answer
We consider the radiation emitted by the human body. Which of the following statements is true :
neet
physics
past papers
2003
20
asked
Jul 24, 2018
by
pady_1
1
answer
The efficiency of carnot engine is 50% and temperature of sink is 500K. If temperature of source is kept constant and its efficiency raised to 60%, then the required temperature of the sink will be : -
neet
physics
past papers
2002
20
asked
Jul 23, 2018
by
pady_1
1
answer
The width of river is 1 km. The velocity of boat is 5 km/hr. The boat covered the width of river with shortest will possible path in 15 min. Then the velocity of river stream is :
neet
physics
past papers
2000
20
asked
Jul 20, 2018
by
pady_1
1
answer
$10^{5}$ coloumb charge liberated 1 gm silver (Ag). If now charge is doubled then the amount of liberated Ag will be :
neet
physics
past papers
1998
20
asked
Jun 15, 2018
by
pady_1
1
answer
A survey was done in all schools of Hyderabad, where each student was asked for their favorite sport. Result of survey is shown in the circle chart. , Which is the least liked sport among students in Hyderabad ?
class5
math
olympiad
data handling
20
asked
Dec 31, 2015
by
pady_1
0
answers
Find the length of a field of area 150 sq. m and breadth 12 m.
class5
math
olympiad
measurements
20
asked
Dec 31, 2015
by
pady_1
0
answers
What is the multiplicative inverse of 0
class5
math
olympiad
fractions
decimals
20
asked
Dec 31, 2015
by
pady_1
0
answers
A boy scored 35 \% marks of 900. He fails by 20 marks. What is the pass marks?
class5
math
olympiad
computation
20
asked
Dec 31, 2015
by
pady_1
0
answers
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