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Physics
List of top Physics Questions
5.6 L of helium gas at STP is adiabatically compressed to 0.7 L. Taking the initial temperature to be
$T_1$
, the work done in the process is
JEE Advanced - 2011
JEE Advanced
Physics
Thermodynamics
A microscope is focussed on an ink mark on the top of a table. lf we place a glass slab of 3 cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass is 1.5
JKCET - 2011
JKCET
Physics
Ray optics and optical instruments
A
$100$
turn closely wound circular coil of radius
$ 10\,cm $
carries a current of
$ 3.2\,A $
. The magnetic moment of the coil is, approximately
JKCET - 2011
JKCET
Physics
Moving charges and magnetism
The wavelength of spectral line coming from a distant star shifts from
$600\, nm$
to
$600.1\, nm$
. The velocity of the star relative to earth is
AMUEEE - 2011
AMUEEE
Physics
Wave optics
Resultant of two vectors
$\vec{A}$
and
$\vec{B}$
is of magnitude
$P$
. If
$\vec{B}$
is reversed, then resultant is of magnitude
$Q$
. What is the value of
$P^2 + Q^2$
?
AMUEEE - 2011
AMUEEE
Physics
Motion in a plane
What is the refractive index of material of a plano convex lens, if the radius of curvature of the convex surface is
$10 \,cm$
and focal length of the lens is
$30 \,cm$
?
AMUEEE - 2011
AMUEEE
Physics
Ray optics and optical instruments
For base station to mobile communication, the required frequency band is
AMUEEE - 2011
AMUEEE
Physics
communication systems
An electron having momentum
$2.4 \times 10^{-23} \,kg \,ms ^{-1}$
enters a region of uniform magnetic field of
$0.15 \,T$
. The field vector makes an angle of
$30^{\circ}$
with the initial velocity vector of the electron. The radius of the helical path of the electron in the field shall be
AMUEEE - 2011
AMUEEE
Physics
Moving charges and magnetism
When you make ice cubes, the entropy of water
JIPMER - 2011
JIPMER
Physics
Thermodynamics
When a ceiling fan is switched on, it makes 10 revolutions in the first 3 seconds. Assuming a uniform angular acceleration, how many rotations it will make in the next 3 seconds?
JIPMER - 2011
JIPMER
Physics
System of Particles & Rotational Motion
If the wavelength of 1st line of Balmer series of hydrogen is 6561 ?, the wavelength of the 2 line of series will be
JIPMER - 2011
JIPMER
Physics
Atoms
An atom bomb is based on the principle of
JIPMER - 2011
JIPMER
Physics
Nuclei
Which of the following circular rods, (given radius
$r$
and length
$l$
) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?
JIPMER - 2011
JIPMER
Physics
thermal properties of matter
A stone of mass 0.3 kg attached to a 1.5 m long string is whirled around in a horizontal circle at a speed of 6 ms. The tension in the string is
JIPMER - 2011
JIPMER
Physics
laws of motion
A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of
JIPMER - 2011
JIPMER
Physics
Electromagnetic waves
A projectile is thrown in the upward direction making an angle of 60
$^{\circ}$
with the horizontal direction with a velocity of 147
$ms^{ - 1}$
Then the time after which its inclination with the horizontal is 45
$^{\circ}$
, is
JIPMER - 2011
JIPMER
Physics
Motion in a plane
A ray is incident on a plane surface. If
$\hat{i} + \hat{j} - \hat{k}$
represents a vector along the direction of incident ray.
$\hat{i} + \hat{j} $
is a vector along normal on incident point in the plane of incident and reflected ray, then vector along the direction of reflected ray is
JIPMER - 2011
JIPMER
Physics
Ray optics and optical instruments
A circuit is made up of a resistance
$1\, \Omega$
and inductance
$0.01\, H$
. An alternating emf of
$200\, V$
at
$50\,Hz$
is connected, then the phase difference between the current and the emf in the circuit is
JIPMER - 2011
JIPMER
Physics
Alternating current
A motor cycle is going on an overbridge of radius
$R$
. The driver maintains a constant speed. As the motor cycle is ascending on the overbridge, the normal force on it
JIPMER - 2011
JIPMER
Physics
laws of motion
A galvanometer having a resistance of 8
$\Omega$
is shunted by a wire of resistance 2
$\Omega$
. If the total current is 1 A, the part of it passing through the shunt will be
JIPMER - 2011
JIPMER
Physics
Moving charges and magnetism
A coil of inductance 300 mH and resistance 2
$\Omega$
is connected to a source of voltage 2 V. The current reaches half of its steady state value in
JIPMER - 2011
JIPMER
Physics
Alternating current
Hard X-rays for the study of fractures in bones should have a minimum wavelength of
$10^{-11}$
m. The accelerating voltage for electrons in X-ray machine should be
JIPMER - 2011
JIPMER
Physics
Atoms
A leaf which contains only green pigments, is illuminated by a laser light of wavelength 0.6328 mm. It would appear to be
JIPMER - 2011
JIPMER
Physics
Wave optics
Interference was observed in a chamber when air was present. Now, the chamber is evacuated and if the same light is used, a careful observation will show
JIPMER - 2011
JIPMER
Physics
Wave optics
The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be
JIPMER - 2011
JIPMER
Physics
Electromagnetic induction
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