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Recent questions and answers in Physics
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Physics
Physics
Class11
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Class12
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The motion of a sphere moving on a rough horizontal surface change from pure sliding (without rolling) to pure rolling (with out slipping) . In this process, the force of friction. 1) initially acts opposite to the direction of motion and later in the direction of motion. 2) causes linear retardation 3) causes angular acceleration 4) stops acting when pure rolling begins. Which of the following is correct?
jeemain
physics
class11
unit5
rotational-motion
medium
answered
1 day
ago
by
blsaketh33
1
answer
A solid sphere of mass m is lying at rest on a rough horizontal surface. The coefficient of friction between the ground and sphere is $\mu$. The maximum value of F, so that the sphere will not slip is equal to
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
answered
Apr 19
by
jainnanu010
2
answers
A body covers a certain distance x in equal thirds - the first third of distance with speed v$_1$, the second third with a speed of v$_2$ and the last third with a speed of v$_3$. What is the average speed of the body over time?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
speed-and-velocity
average-speed
easy
answered
Apr 16
by
ushapattima
2
answers
A spherical body of radius R rolls on a horizontal surface with linear velocity $V$. Let $L_1$ and $L_2$ be the magnitude of angular momentum of the body about the centre of mass and point of contact P respectively. a) $L_2=L_1$ if radius of gyration $k=R$ b) $L_2=2L_1$ for all cases. c) $L_2 > 2L_1$ if radius of gyration $K < R$ d) $L_1> L_2$ if radius of gyration $ K > R$ Which of the following is correct?
jeemain
physics
class11
unit5
rotational-motion
medium
answered
Apr 9
by
kingsumit011
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
answered
Mar 30
by
mahawarravi036
2
answers
Which of the following does not represent Boyle's law?
boyles-law
easy
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
answered
Mar 28
by
mahawarravi036
3
answers
Three capacitors, each of capacitance C are connected to a battery of voltage V. When key K is closed, the charge which will flow through the battery is (see figure).
physics
combination-of-capacitors
asked
Mar 22
by
guptakanishq1
0
answers
A ball is dropped from a height of h from ground. If the coefficient of restitution is e, the height to which the ball goes up after it rebounds for the nth time is
jeemain
physics
class11
ch6
work-power-energy
q12
easy
collisions
coefficient-of-restitution
answered
Mar 5
by
yashuvats.42
2
answers
A man spinning in free space changes of his body e.g by spreading his arms and curling up. By doing this, he can change his 1) moment of inertia 2) angular momentum 3) angular velocity 4) rotational kinetic energy in this Which of the following is correct?
jeemain
physics
class11
unit5
rotational-motion
easy
answered
Feb 28
by
priyanka.c
2
answers
The velocity of electromagnetic radiation in a medium of permittivity $ \in_0$ and permeability $ \mu_0$ is given by :
aipmt
modelpaper
physics
2008
q21
answered
Jan 16
by
jk6765001
2
answers
A person looks in to a spherical mirror . The size of image of his face is twice the actual size of his face. If the face is at distance 20 cm then find the radius of curvature of mirror.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
easy
answered
Dec 1, 2017
by
br.singh21914
2
answers
A horizontal disc rotates freely about a vertical axis through its centre. A ring, having the same mass and radius as the disc , is now gently placed on the disc. After some time, the two rotate with a common angular velocity. 1) some friction exits between the disc and the ring 2) the angular mometum of disc plus ring is conserved. 3) the final common angular velocity is $\large\frac{2}{3}$ rd of the initial angular velocity of disc. 4) $\large\frac{2}{3}$ rd of the initial kinetic energy is converted to heat. Which of the following is correct?
jeemain
physics
class11
unit5
rotational-motion
medium
answered
Oct 8, 2017
by
vlalithambica
1
answer
From the top of a building 40 m tall, a ball a thrown vertically upwards with a velocity of $10\; ms^{-1}$ After how long will the ball hit the ground?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
medium
answered
Aug 13, 2017
by
sl0224422
2
answers
A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls
jeemain
physics
class11
ch5
laws-of-motion
newtons-first-law
easy
answered
Jul 13, 2017
by
akashrao0005
2
answers
Minimum size of plane mirror, required to see full image of an observer is :
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
medium
answered
Jun 20, 2017
by
parthgite94
2
answers
Find the dimension of physical quantity $X$ in the equation $Force=\large\frac{X}{Density}$
jeemain
physics
class11
ch2
units-and-measurement
q44
easy
dimensional-formulae-and-analysis
answered
May 14, 2017
by
muskaans095
2
answers
In the circuit as shown in the figure what is the potential difference between P and Q.
jeemain
physics
question-paper-1
answered
May 13, 2017
by
nikunjjain285
1
answer
The trajectory of a projectile in a vertical plane is $y=ax-bx^2$ where $a$ and $b$ are constants. The maximum height attained by the particle and the angle of projection from horizontal are
jeemain
physics
class11
unit2
kinematics
motion-in-a-plane
projectile-motion
difficult
answered
Apr 24, 2017
by
vipul.saini442
2
answers
Two identical particles , each having a charge of $\;2\times10^{-4}\;C\;$ and mass 10g are kept at a separation of 10 cm and released . What would be the speeds of the particles when the separation becomes large ?
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
medium
answered
Apr 19, 2017
by
mahajanmridul1997
2
answers
electric charge Q,Q and -2Q resp. are placed at the three corners of an equilateral triangle of side a . magnitude of the elctrical dipole moment of the system is
answered
Mar 23, 2017
by
abdulsalamottathil
2
answers
a body is projected vertically upward from the earths surface such that it reaches a height equal to the radius of the earth above its surface.find the velocity of projection
answered
Feb 3, 2017
by
prekshu.02
1
answer
A 150m long train is moving with uniform velocity of 45km / h. The time taken by train to cross the bridge of length 850m is ?
answered
Jan 29, 2017
by
suchala2002
3
answers
Dhoni throws his bat vertically upwards with an initial velocity of $26.2\;m/s$ Determine the height to which the bat will rise above its initial height.
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
motion-under-gravity
medium
answered
Aug 14, 2016
by
donkadasnd
2
answers
Two identical charged spheres are suspended by strings of equal length . The strings make an angle of $\;60^{0}\;$ with each other . When suspended in a liquid of density $\;0.5 g/cc,\;$ the angle remains the same . The dielectric constant of the liquid is [density of material of sphere is $\;1.5 g/cc\;$]
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
answered
Jun 24, 2016
by
dongrearchit
2
answers
Two identical ladders are arranged as shown in the figure, resting on a horizontal surface. Mass of each ladder is M and length L. A block of mass m hangs from the apex point P. If the system is in equilibrium, find direction and magnitude of friction force acting at A or B.
jeemain
physics
rotational-motion
difficult
answered
Apr 1, 2016
by
vijayalakshmi.r
1
answer
A particle of mass m is travelling with a constant velocity $\overrightarrow {V} =V_0 \hat i$ along the line $y=b,z=0$. Let $dA$ be the area swept out by the position vector from the origin to the particle in time at end L be the magnitude of angular momentum of particle about orgin at any time t. Then 1) L= constant 2) $\large\frac{dA}{dt}=\frac{L}{m}$ 3) $\large\frac{dA}{dt}= \frac{2L}{m}$ 4) $\large\frac{dA}{dt}=\frac{L}{2m}$ Which of the following is correct?
jeemain
physics
class11
unit5
rotational-motion
medium
answered
Apr 1, 2016
by
vijayalakshmi.r
1
answer
If the error in the measurement of radius of a sphere is 2%, then the error in the determination of volume of the sphere will be :
aipmt
modelpaper
physics
2008
q2
answered
Feb 12, 2016
by
_1
1
answer
Six equal resistance are connected between point P,Q,R as shown in the fig. Then the net resistance will be maximum between
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A solenoid carrying a current supplied by a DC source with constant emf contains iron rod inside it. when the rod is pulled out of the solenoid , then the current in the solenoid will
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
In an AC circuit V and I are given by $V=100 \sin (100 t) volt \; I =100 \sin (100 t +\large\frac{\pi}{3})amp$ the power dissipated in the circuit is
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
An aeroplane is moving north horizontally , with a speed of $200 ms^{-1}$ ,at a place where the vertical component of the earth's magnetic field is $ 0.5 \times 10^{-4}\;T$ .What is the induced e.m.f set up between the tips of the wings, if they are 10 m apart ?
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
If vectors $\overrightarrow{A} = \cos wt \hat i +\sin w + \hat j$ and $\overrightarrow{B} = \cos wt/2 \hat i +\sin wt/2 + \hat j$ are functions of time , then the value of t at which are orthogonal to each other is
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A child is standing with his two arms outstretched at the center of a turntable that is rotating about its central axis with an angular speed $w_0$ Now the child folds his hands back so that the moment of inertia becomes 3 times the intial values.The new angular speed is
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
Three planets of same density and with radii $R_1,R_2$ and $R_3$ Such that $R_1=2R_2=3R_3$, have gravitational fields on the surfaces $E_1,E_2,E_3$ and escape velocities $v_1,v_2,v_3$ respectively ,then
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A block of wood floats in water with $\large\frac{4}{5}$ th of its volume submerged , but it just floats in a liquid . What is the density of the liquid ?
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A clock with an iron pendulum beeps correct time at $15 ^{\circ}c$ what will be the error in time per day , if the room temperature is $20^{\circ}$?
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A charge q is placed at the centroid of an equilateral triangle. Three charges equal to Q are placed at the vertices of the triangle . The system of the four charges will be in equilibrium . if q is equal to
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
Two H atoms in the ground state collide elastically. The maximum amount by which their combined kinetic energy reduced is
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
The total energy in the ground state of hydrogen atom is $ -13.6\;eV$ . The kinetic energy of this electron in first excited state is :
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
Ina common emitter configuration, a transistor have $\beta= 50$ and input resistance $1k \omega$ . If the peak value of a.c input is $0.01\;V$ then the peak value of collector current is
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A ratio station has two channels . one is AM at $1020 kHz$ and the other FM at $89.5$ MHz. For good results you will use
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A ball is dropped to the ground from a height of 8 m. The coefficient of restitution is 0.5 . To what height will the ball rebound?
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
An astronaut is looking down on Earth's surface from a space shuttle at an attitude of 400 km. Assuming that the assonants pupil diameter is 5 mm and wave length of visible light is 500 nm, the assonant will be able to resolve linear objects of the size of about
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
The second overtone of an openpipe has the same frequency as the first overtone of a closed pipe 2m long . Calculate the length of the open pipe .
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A horizontal platform with an object placed on it is executing is $3.92 \times 10^{-3}$ what must least period of these oscillation , So that the object is not detached from the platform?
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A parallel plate capacitor c with plates of unit area and separation d is filled with a liquid of dielectric constant $k=2$ The level of the liquid is$\large\frac{d}{3}$ initially . Suppose the liquid level decreases at constant speed V, the time constant as a function of time t is
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
The work done in turning a magnet of magnetic moment by an angle of $90^{\circ}$ from the meridian is n times the corresponding work done to turn it through an angle of $60^{\circ}$ . The value of n is given by
jeemain
physics
physics-and-measurement
answered
Feb 8, 2016
by
meena.p
1
answer
A conductivity loop in the form of a circle is placed in a uniform magnetic field with its plane perpendicular to the direction of the field. An e.m.f will be included in the loop if
jeemain
physics
physics-and-measurement
asked
Feb 8, 2016
by
meena.p
1
answer
An objects is located 4 m from the first of two thin covering lenses of focal length 2 m and respectively . The lenses are separated by 3 m. The final image formed by the second less is located from the source ata distance if :
jeemain
physics
physics-and-measurement
asked
Feb 8, 2016
by
meena.p
1
answer
A Tv transmitting antenna is $128$ m tall. If the reactivating antenna is at the ground level, the maximum distance between them for satisfactory communication is LOS mode is (R of earth $=6.4 \times 10^6 m)$
jeemain
physics
physics-and-measurement
asked
Feb 8, 2016
by
meena.p
1
answer
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