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Recent questions in Physics
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JEEMAIN and NEET
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Physics
Physics
Class11
Class12
The magnitude of electric filed as a function of the distance r inside the sphere is given by
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
Two plane mirrors A and B are aligned parallel to each other as shown. A light ray is incident at an angle of $30^{\circ}$ at a point just inside one end of A. The plane of incidence coincides with place of figure. The maximum number of time the ray undergoes reflections (including the first one ) before it emerges out is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
easy
asked
Feb 18, 2014
by
meena.p
1
answer
There are two concentric spherical shells of radii r and 2r . Initially a charge Q is given to the inner shell . Now , switch $\;S_{1}\;$ is closed and opened then $\;S_{2}\;$ is closed and opened and the process is repeated n times for both the keys alternatively . Find the final potential difference between the shells
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
In the ideal YDSE , when a glass plate $(refractive index\;1.5)$ of thickness t is introduced in path of one of interfering beams (wave - length $\lambda$) the intensity at position where central maximum occurred preciously remains unchanged . The minimum thickness of glass plate is :
jeemain
physics
class12
unit16
wave-optics
optics
youngs-double-slit-experiment
medium
asked
Feb 18, 2014
by
meena.p
1
answer
A simple pendulum with a bob of mass m=1 kg , charge $5\;mu C \;$ and string length l=1m is given a horizontal velocity u in a uniform electric field $\;E=2\times10^{6} V/m\;$ at its bottom most point as shown in figure . It is given that the speed u is such that the particle leaves the circle at point C . Find approx the speed u in m/s (Take g=10 m/s^2)
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
A mass m is to be placed on the rod of length L and pivoted at its centre at a distance x from the left end of the rod so that the system shown in figure remains in equilibrium . Find x (Ignore the force between Q (beaneth q ) and 2q and the force between Q (beneath 2q) and q .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
force-between-multiple-charges
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
The electric potential varries in space according to the relation V= 4x+3y . A particle of mass 1 kg starts from rest from point $\;(8 , 3.9 m )\;$ under the influence of this field . Find the velocity of the particle when it crosses the y - axis . The charge on the particle ic $\;+1 \mu C$ .
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
A particle of mass m and charge -Q is constrained to move along the axis of a ring of radius R .The ring carries a uniform charge density $\;+ \lambda\;$ along its length . Initially the particle is in the centre of the ring . Now it is displaced slightly along the axis of ring it's time period of oscillation is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
Two conducting concentric , hollow sphere A and B have radii a and b respectively with A inside B . Their common potentials is V . A is now given some charge such that its potential becomes zero . The potential of B will now be
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
In a uniform electric field , the potential is $10\;V$ at the origin of coordinates and $8V$ at each of the points $(1 ,0 ,0) ,(0 , 1 ,0)\;and\;(0 ,0,1)\;.$ The potential at the point $\;(1 ,1 ,1)\;$ will be
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
A moving charge produces
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-of-charged-particles
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A charged particle is moving along a magnetic field line. The magnetic force on the particle is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A charged particle is moving in a region of uniform magnetic field and a parallel uniform electric field. At some time the velocity of the particle is perpendicular to the magnetic field. The trajectory of the particle will be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A charged particle is moving in a constant magnetic field and at some point it has its velocity vector making an acute angle with the magnetic field. The path of the particle will be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A positively charged particle projected towards north is deflected towards west by a magnetic field. The field may be
jeemain
aipmt
physics
cbse
class12
ch4
ch5
magnetic-effects-of-current-and-magnetism
q5
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A charged particle is whirled on a horizontal flat table by attaching it to a string fixed at one point. If a magnetic field is switched on in the vertical direction, the tension in the string
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
Which of the following particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a constant magnetic field?
jeemain
aipmt
physics
cbse
class12
ch4
moving-charges-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
Which of the following particles will describe the smallest circle when projected with the same velocity perpendicular to a constant magnetic field?
jeemain
aipmt
physics
cbse
class12
ch4
moving-charges-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
Which of the following particles will experience maximum magnetic force when projected with the same velocity perpendicular to a constant magnetic field?
jeemain
aipmt
physics
cbse
class12
ch4
ch5
moving-charge-and-magnetism
magnetic-force
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A small ball of mass m and charge +q tied with a string of length l , rotating in a vertical circle under gravity and a uniform horizontal electric field E as shown . The tension in the string will be minimum for
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 17, 2014
by
yamini.v
1
answer
Consider the following statements \[\] Statement 1: The electric bulb glows immediately when switch is turned on \[\] Statement 2: The drift velocity of electrons is very high in metallic conductors
jeemain
physics
current-electricity
cbse
class12
ch3
q149
easy
electric-current-concepts
concepts
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
Consider the following statements \[\] Statement 1: Voltmeter is much better than a potentiometer for measuring the emf of the cell \[\] Statement 2: A potentiometer draws no current while measuring the emf of the cell
jeemain
physics
current-electricity
cbse
class12
ch3
q148
easy
concepts
meter-bridge-and-potentiometer-instrumentation
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
Which of the following statements is false? \[\] The potential difference across the terminals of a non-ideal battery is
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
Two bulbs consume same power when operated at $200V\: and\: 300V$ respectively. When these bulbs are connected in series across a $DC$ supply of $500V$, then consider the following statements
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
medium
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
Three wires of the same material are connected in parallel to a source of emf. Their lengths are in the ratio 1 : 2 : 3 and cross-sectional areas are in the ratio 2 : 4 : 1. Then, the ratio of power dissipated across them will be
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
Voltmeter reads the potential difference across the terminals of an old battery as $1.4V$ while a potentiometer reads it as $1.55V$. The voltmeter resistance is $280\; \text{ohms}$. Consider the following statements:
jeemain
physics
current-electricity
cbse
class12
ch3
q144
medium
meter-bridge-and-potentiometer-instrumentation
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
A battery of $emf\: E$ and internal resistance $ r$ is connected across a resistance $ R.\: R$ can be adjusted to any value greater than or equal to zero. A graph is plotted between the current through the resistance and the potential difference across it. Select the incorrect alternative
jeemain
physics
current-electricity
cbse
class12
ch3
q
q143
medium
cells-emf-internal-resistance
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
Which of the following is incorrect: \[\] When a potential difference is applied across, the current passing through
jeemain
physics
current-electricity
cbse
class12
ch3
electric-current-concepts
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
The electrochemical equivalent of a metal is $ 3.3 \times 10^{−7}$ at the cathode when a $3\: A$ current is passed for 2 seconds will be kg per coulomb. The mass of the metal liberated
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
chemical-effect-of-current
difficult
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
Time taken by a $836\: W$ heater to heat one liter of water from $10^{\circ}C\: to\: 40^{\circ}C$ is
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
medium
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
In a meter bridge experiment null point is obtained at 20 cm from one end of the wire when resistance $X$ is balanced against another resistance Y. If $ X < Y$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4$X$ against $Y$?
jeemain
physics
current-electricity
sec-a
cbse
class12
ch5
meter-bridge-potentiometer-instrumentation
medium
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the length and radii of the wires are in the ratio of $ \large\frac{4}{3} \: and \:\large\frac{2}{3}$, then the ratio of the currents passing through the wires will be
jeemain
physics
current-electricity
cbse
class12
ch5
ohms-law
medium
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
The resistance of the series combination of two resistances is $S$. When they are joined in parallel through total resistance is $P$. If $S = nP$, then the minimum possible value of $n$ is
jeemain
physics
current-electricity
cbse
class12
ch5
combination-of-resistance
equivalent-resistance
difficult
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
The total current supplied by the battery is
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
Alternating current cannot be measured by $DC$ ammeter because
jeemain
physics
current-electricity
cbse
class12
ch4
electric-current-concepts
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
A parallel plate condenser with a dielectric of dielectric constant $K$ between the plates has a capacity $C$ and is charged to a potential of $V$ volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is
jeemain
physics
electrostatics
electrostatic-potential-and-capacitance
cbse
class12
ch4
medium
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
The resistance of a wire is $5\: ohm \: at\: 50^{\circ}C$ and $6\: ohm \: at\: 100^{\circ}C$. The resistance of the wire at $0^{\circ}C$ will be
jeemain
physics
current-electricity
cbse
class12
ch5
temperature-dependence-of-resistance
medium
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
An ideal coil of $10H$ is connected in series with a resistance of $5 \Omega$ and a battery of $ 5V$. 2 second after the connection is made the current flowing in amperes in the circuit is
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
inductance
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
An inductor $(L = 100\: mH)$, a resistor $(R = 100\Omega)$ and a battery $(E = 100 \: V)$ are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit $1\: ms$ after the circuit is
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
inductance
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
An electric bulb is rated $220V$- $100W$. The power consumed by it when it operates on $110V$ is
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
The resistance of a bulb filament is $ 100\Omega$ at a temperature of $100^{\circ}C$. If its temperature coefficient of resistance be $0.005 \: per^{\circ}C$ its resistance will become $200\Omega$ at a temperature of
jeemain
physics
current-electricity
cbse
class12
ch5
temperature-dependence-of-resistance
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
In a Wheatstone's bridge their resistances P, Q and R connected in the three arms and the fourth arm is formed by the two resistances $S_1\: and \: S_2$ connected in parallel. The condition for bridge to be balanced will be
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-potentiometer-instrumentation
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
Which of the following units denote the dimensions of $\large\frac{ML^2}{Q^2}$ , where $Q$ denotes electric charge
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
inductance
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
The Kirchhoff’s first law $ (\sum i = 0)$ and second law $(\sum iR = \sum E)$ where symbols have their usual meanings, are respectively based on conservation of
jeemain
physics
current-electricity
cbse
class12
ch5
kirchhoffs-law
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
A material B has twice the specific resistance of A. A circular wire made of B has twice the diameter of a wire made of A. Then for the two wires to have the same resistance, the ratio $ \large\frac{l_A}{l_b}$ of their respective lengths must be
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100W and 200V lamp when not in use?
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of $ 2 \Omega$ the balancing length becomes 120 cm. The internal resistance of the cell is
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-potentiometer-instrumentation
difficult
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
An energy source will supply a constant current into the loads of its internal resistance is
jeemain
physics
current-electricity
cbse
class12
ch5
cells-emf-internal-resistance
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
A coil of inductance 300 mH and resistance $2\Omega$ is connected to a source of voltage 2V. The current reaches half of its steady state value in
jeemain
physics
alternating-current
cbse
class12
ch7
ac-voltage-applied-to-inductor
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
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