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Physics
List of top Physics Questions
A siren emitting sound of frequency 500 Hz is going away from a stationary listener with a speed of
$ 50\,\,m/s $
, the frequency of sound to be heard directly from the siren is:
Punjab PMET - 2003
Punjab PMET
Physics
sound
The peak value of alternating current is
$ 5\sqrt{2} $
ampere. The mean square value of current will be:
Punjab PMET - 2003
Punjab PMET
Physics
AC Voltage
In junction diode, the holes are because of:
Punjab PMET - 2003
Punjab PMET
Physics
applications of diode
The length of a simple pendulum executing simple harmonic motion is increased by
$21\%$
. The percentage increase in the time period of the pendulum of increased length is
AIEEE - 2003
AIEEE
Physics
simple harmonic motion
The image formed by an objective of a compound microscope is
AIEEE - 2003
AIEEE
Physics
Optical Instruments
The electrostatic capacitance depends on:
AFMC - 2003
AFMC
Physics
Capacitors and Capacitance
The electric potential between a proton and an electron is r given by
$V = V_0 in\frac{r}{r_0}, where r_0$
is a constant. Assuming Bohr's model to be applicable, write variation of rn with n, n being the principal quantum number.
IIT JEE - 2003
IIT JEE
Physics
Electrostatic potential
The displacement of a particle varies according to the relation
$x = 4(cos\, pt + sin \,pt).$
the amplitude of the particle is
AIEEE - 2003
AIEEE
Physics
simple harmonic motion
Reverse bias applied to a junction diode
AIPMT - 2003
AIPMT
Physics
P-N Junction
The slope of plate characteristic and mutual characteristic curves of a triode valve is
$0.02\, mA / V$
and
$1 \,mA / V$
. The amplification factor of triode valve is:
JIPMER - 2003
JIPMER
Physics
P-N Junction
In the following common emitter configuration an
$n p n$
transistor with current gain
$\beta=100$
is used. The output voltage of the amplificr will be
AIIMS - 2003
AIIMS
Physics
Semiconductor electronics: materials, devices and simple circuits
In fission of
$U-235$
, the percentage of mass convened into energy is about:
AFMC - 2003
AFMC
Physics
Nuclei
The focal length of objective and eye piece of a telescope are
$ {{f}_{0}} $
and
$ {{f}_{e}} $
respectively. Then its magnification will be:
Rajasthan PMT - 2003
Rajasthan PMT
Physics
single slit diffraction
If the critical angle for total internal reflection from a medium to vacuum is
$ 30{}^\circ $
, then the speed of light in the medium is
Rajasthan PMT - 2003
Rajasthan PMT
Physics
Ray optics and optical instruments
A prism has a refracting angle of
$ 60{}^\circ $
. If it produces a minimum deviation of
$ 30{}^\circ $
in an incident ray, the angle of incidence is
Rajasthan PMT - 2003
Rajasthan PMT
Physics
Ray optics and optical instruments
A liquid has only
Rajasthan PMT - 2003
Rajasthan PMT
Physics
mechanical properties of fluid
The ratio of radii of two spheres of same material is
$1 : 4$
, then the ratio of their heat capacities is
Rajasthan PMT - 2003
Rajasthan PMT
Physics
specific heat capacity
A solid sphere is rolling without slipping on a horizontal surface. The ratio of its rotational kinetic energy and translational kinetic energy is:
Rajasthan PMT - 2003
Rajasthan PMT
Physics
System of Particles & Rotational Motion
Bernoulli's equation is a consequence of conservation of
AIIMS - 2003
AIIMS
Physics
mechanical properties of fluid
The stars twinkle while the planets do not. The stars are much bigger in size than the planets.
AIIMS - 2003
AIIMS
Physics
Ray optics and optical instruments
Microwave communication is preferred over optical communication. Microwaves provide large number of channels and bandwidth compared to optical signals.
AIIMS - 2003
AIIMS
Physics
Electromagnetic waves
A Carnots engine operates between
$400\, K$
and
$800\, K$
, its efficiency is :
Haryana PMT - 2003
Haryana PMT
Physics
carnot cycle
A circular ring of mass
$ m $
and radius
$ r $
is rolling on a smooth horizontal surface with speed
$ u $
. Its kinetic energy is :
Haryana PMT - 2003
Haryana PMT
Physics
Kinetic Energy
A satellite is revolving around the earth in a circular orbit of radius
$4$
times that of the parking orbit. The time period of the satellite is :
Haryana PMT - 2003
Haryana PMT
Physics
Keplers Laws
As shown in figure,
$a$
planet revolves in elliptical orbit around the sun, where
$K.E.$
of the planet is maximum :
Haryana PMT - 2003
Haryana PMT
Physics
Keplers Laws
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