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Recent questions in Physics
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JEEMAIN and NEET
>>
Physics
Physics
Class11
Class12
Thirteen resistors each of resistance R are connected in the circuit as shown. What sis the effective resistance between A and B?
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
difficult
asked
Feb 4, 2014
by
thanvigandhi_1
1
answer
The equivalent resistance between the points A and B is
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
difficult
asked
Feb 4, 2014
by
thanvigandhi_1
1
answer
A uniform electric field of 100 V/m is directed at
30
0
with the +ve x - axis as shown in figure . Find the potential difference
V
B
A
if OA=2 m and OB= 4 m
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 4, 2014
by
yamini.v
1
answer
Two identical balls having a mass m and small radii and having equal charge q are suspendended from common point by two insulating strings of equal length l . In equilibrium each string makes an angle
θ
with the vertical . If
θ
=
45
0
f
i
n
d
l
2
in terms of q and m
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Feb 4, 2014
by
yamini.v
1
answer
In the given circuit, the current through the battery is independent of
R
6
. Then which of these relation holds
jeemain
physics
current-electricity
cbse
class12
ch4
kirchoffs-law-wheatstone-bridge
easy
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
The equivalent resistance between the terminals A and D of the following circuit is:
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
medium
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
A metallic wire of resistance 12
Ω
is bent to form a square. The effective resistance between two diagonal points would be
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
easy
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
In the circuit shown, the steady state potential drop across the capacitor must be
jeemain
physics
current-electricity
cbse
class12
ch4
kirchoffs-law-wheatstone-bridge
medium
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
In the circuit shown, the current passing through the:
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
medium
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
As the temperature of the conductor increases, the ratio of resistivity to conductivity
jeemain
physics
current-electricity
cbse
class12
ch4
electric-current-concepts
easy
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
Which of the following quantity associated with the resistor, does not change with temperature
jeemain
physics
current-electricity
cbse
class12
ch4
electric-current-concepts
easy
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
The net resistance of a voltmeter should be large to ensure that
jeemain
physics
current-electricity
cbse
class12
ch4
concepts
electric-current-concepts
easy
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
The net resistance of an ammeter should be small to ensure that
jeemain
physics
current-electricity
cbse
class12
ch4
electric-current-concepts
easy
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
Consider the charging of a capacitor. Let
Q
1
be the charge given to it in first t seconds and
Q
2
be the charge given to it in the next t seconds. Also, let
t
1
be the time required to deposit a charge Q (less than half the maximum charge) and
t
2
be the time required to deposit an additional charge of Q, then:
jeemain
physics
electrostatic-potential-and-capacitance
cbse
class12
ch2
medium
q5
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
In an electric circuit containing a battery, the charge (positive by convention) inside the battery
jeemain
physics
current-electricity
cbse
class12
ch3
electric-current-concepts
medium
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
The work done in placing a charge of
8
×
10
−
18
coulomb on a condenser of capacity 100 micro-farad is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
parallel-plate-capacitor
easy
asked
Feb 3, 2014
by
yamini.v
1
answer
Four dipols each of magnitudes of charges
±
q
are placed inside a sphere . The total flux of
→
E
coming out of the sphere is
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
easy
asked
Feb 3, 2014
by
yamini.v
1
answer
Two isolated charged conducting spheres of radii a and b produce the same electric field near their surfaces . The ratio of electric potential on their surfaces is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
easy
asked
Feb 3, 2014
by
yamini.v
1
answer
Three concentric conducting spherical shells carry charges +4Q on the inner shell , -2Q on the middle shell and +6Q on the outer shell . The charge on the inner surface of outer shell is
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
easy
asked
Feb 3, 2014
by
yamini.v
1
answer
The electric field in a region is given by
→
E
=
α
ˆ
i
+
β
ˆ
j
.
Here
α
a
n
d
β
are constants . The net flux through a square are of side l parallel to y - z plane
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
easy
asked
Feb 3, 2014
by
yamini.v
1
answer
ABC is an equilateral triangle of each side 5 cm . Two charges of
±
50
3
×
10
−
3
μ
C
are placed at B and A respectively . Find the magnitude of resultant field at C .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
easy
asked
Feb 3, 2014
by
yamini.v
1
answer
Two point charges of 5C and 20C are separated by a distance of 6m . Find the point on the line joining them at which electric field intessity is zero .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
easy
asked
Feb 3, 2014
by
yamini.v
1
answer
If the electric flux entering and leaving an enclosed surface is
ϕ
1
a
n
d
ϕ
2
.
The charge inside the surface will be
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
easy
asked
Feb 3, 2014
by
yamini.v
1
answer
Gas-A is kept in the left partition of the container with a temperature of T at pressure 2P. Gas-B is kept in the right part of the container with a temperature of 4T at pressure P. When what is the value of the Pressure P' when the partition is removed?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
medium
asked
Jan 31, 2014
by
balaji
1
answer
Gas-A is kept in the left partition of the container with a volume 2V at pressure P. Gas-B is kept in the right part of the container with a volume of 3V at pressure P. Both the portions are the same temperature T. When what is the value of the Pressure P' when the partition is removed?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 31, 2014
by
balaji
1
answer
Gas-A is kept in the left partition of the container with a volume V/n at pressure P. Gas-B is kept in the right part of the container with a volume of V/(n+1) at pressure P. Both the portions are the same temperature T. When what is the value of the Pressure P' when the partition is removed?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 31, 2014
by
balaji
1
answer
Consider the following case. What is the value of P' ?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
medium
asked
Jan 31, 2014
by
balaji
1
answer
Hot air balloon is an application of what law?
jeemain
physics
kinetic-theory-of-gases
easy
class11
ch13
behaviour-of-gases
ideal-gas-law
charles-law
asked
Jan 31, 2014
by
balaji
3
answers
Bursting of a soda bottle in summer is an example of ?
jeemain
physics
kinetic-theory-of-gases
easy
class11
ch13
behaviour-of-gases
ideal-gas-law
guy-lussacs-law
asked
Jan 31, 2014
by
balaji
1
answer
Which of the following graphs will be linear with zero slope in case of an ideal gas?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
ideal-gas-law
easy
behaviour-of-gases
asked
Jan 31, 2014
by
balaji
1
answer
Two diatomic gases have denisities d1 and d2 under similar conditions. The ratio of the root mean square velocities is?
jeemain
physics
kinetic-theory-of-gases
speed-of-molecules
easy
class11
ch13
kinetic-theory-of-an-ideal-gas
asked
Jan 31, 2014
by
balaji
1
answer
A container contains an ideal gas. The wall is hit by "n" molecules / second, each of mass "m" and moving the same velocity "u". The force exerted by the molecules on the wall is?
jeemain
physics
kinetic-theory-of-gases
speed-of-molecules
medium
class11
ch13
kinetic-theory-of-an-ideal-gas
asked
Jan 31, 2014
by
balaji
1
answer
An ideal gas kept in vessel has rms spped of 200 m/s. If 10% of the gas leaks out of the vessel, then the rms speed of the remaining molecules is?
jeemain
physics
kinetic-theory-of-gases
speed-of-molecules
medium
class11
ch13
kinetic-theory-of-an-ideal-gas
asked
Jan 31, 2014
by
balaji
1
answer
A liquid is boiled and its temperature (T) versus Heat supplied (Q) graph is plotted. Which of the following is the correct graph?
jeemain
physics
kinetic-theory-of-gases
cbse
medium
class11
ch13
xtra
asked
Jan 31, 2014
by
balaji
1
answer
If for an ideal gas,
R
C
v
=
0.29
, it's shape is?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
easy
specific-heat-capacity
molar-specific-heat
asked
Jan 31, 2014
by
balaji
1
answer
In the circuit given below the value of current is :
jeemain
physics
class12
ch14
q100
easy
mock
junction-diodes
semiconductor-electronics
asked
Jan 31, 2014
by
meena.p
1
answer
A transistor is connected in common emitter mode. In the collector circuit the voltage drop across the resistor of
800
Ω
is
0.5
V
. If current gain
α
is
0.96
What is base current
jeemain
physics
class12
unit19
ch14
q99
medium
transistors
semiconductor-electronics
asked
Jan 31, 2014
by
meena.p
1
answer
When forward bias is applied to a p-n junction.
jeemain
physics
class12
unit19
ch14
q98
easy
semiconductor-electronics
concepts
pn-junction
asked
Jan 31, 2014
by
meena.p
1
answer
Functions of rectifier is
jeemain
physics
class12
unit19
ch14
q88
easy
asked
Jan 31, 2014
by
meena.p
1
answer
The graph given below represents the I-V characteristics of a zener diode. Which part of the curve is relevant for operation as voltage regulator?
jeemain
physics
class12
unit19
ch14
q96
easy
junction-diodes
semiconductor-electronics
asked
Jan 31, 2014
by
meena.p
1
answer
In extrinsic semiconductors
jeemain
physics
class12
unit19
ch14
q95
easy
asked
Jan 31, 2014
by
meena.p
1
answer
To obtain a p-type semiconductor germanium is doped with
jeemain
physics
class12
unit19
ch14
q94
easy
asked
Jan 31, 2014
by
meena.p
1
answer
To obtains p-type germanium semiconductor it must be doped with
jeemain
physics
class12
unit19
ch14
q93
easy
asked
Jan 31, 2014
by
meena.p
1
answer
Zener diode :
jeemain
physics
class12
unit19
ch14
q92
easy
asked
Jan 31, 2014
by
meena.p
1
answer
A Diode Laser
jeemain
physics
class12
unit19
ch14
q91
easy
semiconductor-electronics
concepts
diode
asked
Jan 31, 2014
by
meena.p
1
answer
To make a full wave rectifier using these four diodes, the ac input should be applied across what?
jeemain
physics
class12
unit19
ch14
q90
junction-diodes
semiconductor-electronics
easy
asked
Jan 31, 2014
by
meena.p
1
answer
When a solid with a band gap has a donor level just below its empty energy band, its solid is
jeemain
physics
class12
unit19
ch14
q89
easy
semiconductor-electronics
concepts
asked
Jan 31, 2014
by
meena.p
1
answer
Which of the following logic gate is an universal gate
jeemain
physics
class12
unit19
ch14
q88
easy
logic-gates
semiconductor-electronics
concepts
asked
Jan 31, 2014
by
meena.p
1
answer
In Boolean Algebra what is value of
A
.
B
+
A
.
C
.
B
jeemain
physics
class12
unit19
ch14
q87
easy
logic-gates
semiconductor-electronics
asked
Jan 31, 2014
by
meena.p
1
answer
Using law of Boolean Algebra the value of
A
+
(
ˉ
A
B
)
jeemain
physics
class12
unit19
ch14
q86
easy
logic-gates
semiconductor-electronics
concepts
asked
Jan 31, 2014
by
meena.p
1
answer
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