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Recent questions tagged 2011
Questions
Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would
neet
physics
past papers
2011
40
asked
Aug 16, 2018
by
pady_1
2
answers
In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is :
neet
physics
past papers
2011
39
asked
Aug 16, 2018
by
pady_1
1
answer
A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describe best the image formed of an object of height 2 cm placed 30 cm from the lens ?
neet
physics
past papers
2011
38
asked
Aug 16, 2018
by
pady_1
1
answer
Which of the following is not due to total internal reflection ?
neet
physics
past papers
2011
37
asked
Aug 16, 2018
by
pady_1
1
answer
The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is :
neet
physics
past papers
2011
36
asked
Aug 16, 2018
by
pady_1
1
answer
The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is :
neet
physics
past papers
2011
35
asked
Aug 16, 2018
by
pady_1
1
answer
Sound waves travel at $350 m/s$ through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from wave air :
neet
physics
past papers
2011
34
asked
Aug 16, 2018
by
pady_1
1
answer
Out of the following functions representing motion of a particle which represents SHM : <br> (A) $y = \sin \omega t - \cos \omega t $ <br> (B) $ y = \sin^3 \omega t $ <br> (C) $ y = 5 \cos (\frac{3 \pi}{4} - 3 \omega t)$ <br> (D) $ y = 1 + \omega t + \omega^2 t^2$
neet
physics
past papers
2011
33
asked
Aug 16, 2018
by
pady_1
1
answer
Two waves are represented by the equations $y_1 = a \sin (wt + kx + 0.57) m$ and $ y_2 = a \cos (wt + kx) m, where \;$x$\; is\; in\; meter\; and\; $t in sec. The phase difference between them is :
neet
physics
past papers
2011
32
asked
Aug 16, 2018
by
pady_1
1
answer
A particle of mass m is released from rest and follows a parabolic path as shown. Assuming that the displacement of the mass from the origin is small which graph correctly depicts the position of the particles as a function of time ? <br>
neet
physics
past papers
2011
31
asked
Aug 16, 2018
by
pady_1
1
answer
During an isothermal expansion, a confined ideal gas does - 150 J of work against its surroundings. This implies that :
neet
physics
past papers
2011
30
asked
Aug 16, 2018
by
pady_1
1
answer
When 1 kg of ice at $0^oC$ melts to water at $0^oC$, the resulting change in its entropy, taking latent heat of ice to be $80 \; Cal/gm$ is :
neet
physics
past papers
2011
29
asked
Aug 16, 2018
by
pady_1
1
answer
An ac voltage is applied to a resistance R and the inductive reactance are both equal to $3 \Omega$, the phase difference between the applied voltage and the current in the circuit is :
neet
physics
past papers
2011
28
asked
Aug 16, 2018
by
pady_1
1
answer
In an ac circuit an alternating voltage $e = 200 \sqrt{2} \sin 100 \; t\; volts$ is connected to a capacitor of capacity $1 \mu F$. The r.m.s. value of the current in the circuit is :
neet
physics
past papers
2011
27
asked
Aug 16, 2018
by
pady_1
1
answer
The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be : <br>
neet
physics
past papers
2011
26
asked
Aug 16, 2018
by
pady_1
1
answer
A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron :
neet
physics
past papers
2011
25
asked
Aug 16, 2018
by
pady_1
1
answer
The electric and the magnetic field, assiociated with an e.m wave, propagating along the +z - axis, can be represented by :
neet
physics
past papers
2011
24
asked
Aug 16, 2018
by
pady_1
1
answer
There are four light-weight -rood samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted : <br> (a) A is feebly repelled <br> (b) B is feebly attracted <br> (c) C is strongly attracted <br> (d) D remains unaffected <br> Which one of the following is true ?
neet
physics
past papers
2011
23
asked
Aug 16, 2018
by
pady_1
1
answer
The power obtained in a reactor using $U^{235}$ disintegration is 1000 kW. The mass decay of $U^{235}$ per hour is :
neet
physics
past papers
2011
22
asked
Aug 16, 2018
by
pady_1
1
answer
A current carrying closed loop in the form of a right angle isoceles triangle ABC is placed in a uniform magnetic field acting along AB. If the magnetic force on the arm BC is $\overrightarrow{F}$ , the force on the arm AC is : <br>
neet
physics
past papers
2011
21
asked
Aug 16, 2018
by
pady_1
2
answers
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
A current of 2 A flows through a $2 \Omega$ resistor when connected across a battery. The same battery supplies a current of 0.5 A when connect across a $ 9 \Omega$ resistor. The internal resistance of the battery is :
neet
physics
past papers
2011
19
asked
Aug 16, 2018
by
pady_1
1
answer
If power dissipated in the $9 \Omega$ resistor in the circuit shown is 36 Watt, the potential difference across the $2 \Omega$ resistor is :
neet
physics
past papers
2011
18
asked
Aug 16, 2018
by
pady_1
1
answer
A parallel plate condenser have a uniform electric field $E(V/m)$ in the space between the plates. If the distance between the plates is $d(m)$ and area of each plate is $A(m^2)$ the energy (joules) stored in the condenser is :
neet
physics
past papers
2011
17
asked
Aug 16, 2018
by
pady_1
1
answer
Four electric charge +q, +1, - q and -q are placed at the corners of a square of side 2L. (see figure). The electric potential at point A, midway between the two charge +q and +q, is : <br>
neet
physics
past papers
2011
16
asked
Aug 16, 2018
by
pady_1
1
answer
A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will :
neet
physics
past papers
2011
15
asked
Aug 16, 2018
by
pady_1
1
answer
Force F on a particle moving in a straight line varies with distance d as shown in the figure. The work done on the particle during its displacement of 12 m is : <br>
neet
physics
past papers
2011
14
asked
Aug 16, 2018
by
pady_1
1
answer
A missile is fired for maximu range with an initial velocity of 20 m/s. If $g = 10\; m/s^2$ , the range of the missile is :
neet
physics
past papers
2011
13
asked
Aug 16, 2018
by
pady_1
1
answer
A body is moving with velocity 30 m/s towards east. After 10 seconds its velocity becomes 40 m/s towards north. The average acceleration of the body is :
neet
physics
past papers
2011
12
asked
Aug 16, 2018
by
pady_1
1
answer
The potential energy of a system increases if work is done :
neet
physics
past papers
2011
11
asked
Aug 16, 2018
by
pady_1
1
answer
A radioactive nucleus of mass M emits a photon of frequency $\nu$ and the nucleus recoils. The recoil energy will be -
neet
physics
past papers
2011
10
asked
Aug 16, 2018
by
pady_1
1
answer
A planet moving along an elliptical orbit is closest to the sun at a distance $r_1$ and farthest away at a distance of $r_2$. If $v_1$ and $v_2$ are the linear velocities at these points respectively, then the ratio $\frac{v_1}{v_2}$ is :
neet
physics
past papers
2011
9
asked
Aug 16, 2018
by
pady_1
1
answer
A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The impulse experienced by the body is -
neet
physics
past papers
2011
8
asked
Aug 16, 2018
by
pady_1
1
answer
A particle moves in a circle of radius 5 cm with constant speed and time period $0.2 \pi s$. The acceleration of the particle is :
neet
physics
past papers
2011
7
asked
Aug 16, 2018
by
pady_1
1
answer
The instantaneous angular position of a point on a rotating wheel is given by the equation $\theta (t) = 2t^3 - 6 t^2$ <br> The torque on the wheel becomes zero at :
neet
physics
past papers
2011
6
asked
Aug 16, 2018
by
pady_1
1
answer
A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest :
neet
physics
past papers
2011
5
asked
Aug 16, 2018
by
pady_1
1
answer
A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration $1.0 m/s^2$. If $g = 10 ms^{-2}$, the tension in the supporting cable is :
neet
physics
past papers
2011
4
asked
Aug 16, 2018
by
pady_1
1
answer
A boy standing at the top of a tower of 20 m height drops a stone. Assuming $g = 10 ms^{-2}$, the velocity with which it hits the ground is :
neet
physics
past papers
2011
3
asked
Aug 16, 2018
by
pady_1
1
answer
The moment of inertia of a thin uniform rod of mass M and length L about an axis passing through its midpoint and perpendicular to its length is $I_0$. Its moment of inertia about an axis passing through one of its ends and perpendicular to its length is :
neet
physics
past papers
2011
2
asked
Aug 16, 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 teacher was explaining about a plant whose venation pattern is basically similar to Eryngium, fruit is berry and stem shows signs of perennation. He was trying to arrive at one of the following :
jeemain
eamcet
biology
2011
q3
asked
Nov 10, 2013
by
thanvigandhi_1
0
answers
Which one of the following is the ratio of the lowering of vapour pressure of 0.1 m aqueous solutions of $ BaCI_2, NACI\: and \: AI_2(SO_4)_3$ respectively ?
jeemain
eamcet
chemistry
2011
q160
asked
Nov 9, 2013
by
thanvigandhi_1
0
answers
Under which one of the following conditions do real gases approach the ideal gas behaviour ?
jeemain
eamcet
chemistry
2011
q159
asked
Nov 9, 2013
by
thanvigandhi_1
1
answer
19 gms of a mixture containing $NaHCO_3\: and \: Na_2CO_3$ on complete heating liberated 1.12 lit of $CO_2$ at STP. The weight of the remaining solid was 15.9 gms. What is the weight ( in g ) of $Na_2CO_3$ in the mixture before heating ?
jeemain
eamcet
chemistry
2011
q158
asked
Nov 9, 2013
by
thanvigandhi_1
0
answers
In which of the following pairs, the central atoms have the same number of lone pairs of electrons ?
jeemain
eamcet
chemistry
2011
q157
asked
Nov 9, 2013
by
thanvigandhi_1
1
answer
The formal changes of $ N_{(1)}, N_{(2)}$ and $O$ atoms in : $ \ddot{N_{(1)}} =\ddot{N_{(2)}} = \ddot {O} : $ are respectively :
jeemain
eamcet
chemistry
2011
q156
asked
Nov 9, 2013
by
thanvigandhi_1
0
answers
Which one of the following is correct order of second ionization potential of Na, Ne, Mg and AI?
jeemain
eamcet
chemistry
2011
q155
asked
Nov 9, 2013
by
thanvigandhi_1
0
answers
According to Bohr's theory, which one of the following values of angular momentum of hydrogen atom is not permitted ?
jeemain
eamcet
chemistry
2011
q154
asked
Nov 9, 2013
by
thanvigandhi_1
0
answers
Which one of the following frequencies of radiation ( in Hz) has a wavelength of 600 nm?
jeemain
eamcet
chemistry
2011
q153
asked
Nov 9, 2013
by
thanvigandhi_1
0
answers
Assertion (A) : Cyclohexane is the most stable Cycloalkane. Reasons (R) : Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.
jeemain
eamcet
chemistry
2011
q152
asked
Nov 9, 2013
by
thanvigandhi_1
0
answers
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