Email
Chat with tutors
Login
Ask Questions, Get Answers
Menu
X
home
ask
tuition
questions
practice
papers
mobile
tutors
pricing
X
Recent questions tagged physics
Questions
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
A parallel plate capacitor is made by stacking $n$ equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is C then the resultant capacitance is
jeemain
physics
electrostatics
electrostatic-potential-and-capacitance
cbse
class12
ch4
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are $R_1\: and \: R_2 (R_2 > R_1)$. If the potential difference across the source having internal resistance $R_2$ is zero then,
jeemain
physics
current-electricity
cbse
class12
ch5
cells-emf-internal-resistance
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
In the circuit the galvanometer $G$ shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor $R$ will be
jeemain
physics
current-electricity
cbse
class12
ch5
ohms-law
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
Two voltameters one of copper and other of silver, are joined in parallel. When a total charge $q$ flows through a voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are $z_1\: and \: z_2$ respectively the charge which flows through the silver voltameter is
jeemain
physics
current-electricity
cbse
class12
ch5
chemiocal-effect-of-current
difficult
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
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 volt, the resistance in ohms needed to be connected in series with the coil will be
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-potentiometer-and-instrumentation
difficult
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
Let $ \varepsilon_0$ denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length and T = time and A = electric current then,
jeemain
physics
electrostatics
electric-charges-and-fields
cbse
class12
ch3
q113
difficult
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
In an LCR circuit as shown below both switches are open initially . Now switch $S_1$ is closed $S_2$ kept open. ( q is charge on the capacitor and $\tau = RC$ is capacitive time constant ) which of the following statement is correct ?
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
inductance
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
What is the dimensional formula for inductance?
jeemain
physics
electromagnetic-induction
cbse
class12
ch3
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
What is the dimensional formula for capacitance?
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
What is the dimensional formula for resistivity?
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
A 5V battery with internal resistance $2\Omega$ and a 2V battery with internal resistance $1\Omega$ are connected to a $ 10 \Omega $ resistor as shown in the figure. The current in the $ 10\Omega $ resistor is
jeemain
physics
current-electricity
cbse
class12
ch5
ohms-law
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
Page:
« prev
1
...
377
378
379
380
381
382
383
...
400
next »
Home
Ask
Tuition
Questions
Practice
Your payment for
is successful.
Continue
...