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Physics
List of top Physics Questions
A dielectric of dielectric constant
$K$
is introduced such that half of its area of a capacitor of capacity
$C$
is occupied by it. The new capacity is
JKCET - 2007
JKCET
Physics
electrostatic potential and capacitance
If distance between earth and sun become four times then time period becomes
DUET - 2007
DUET
Physics
Gravitation
If the coefficient of mutual induction of the primary and secondary coils of an induction coil is $5\, H$ and a current of $10 A$ is cut-off in $5 \times 10^{-4} s$, the emf inducted (in volt) in the secondary coil is :
VITEEE - 2007
VITEEE
Physics
Transformers
Four independent waves are represented by equations : (1) $X_{1}=a_{1} \sin \omega t$ (2) $X_{2}=a_{1} \sin 2 \omega t$ (3) $X_{3}=a_{1} \sin \omega_{1} t$ (4) $X_{4}=a_{1} \sin (\omega t+\delta)$ Interference is possible between waves represented by equations :
VITEEE - 2007
VITEEE
Physics
wave interference
$A B C D$
is a rectangle. At corners
$B, C$
and
$D$
of the rectangle are placed charges
$+10 \times 10^{-10} C , \quad-20 \times 10^{-12} C \quad$
and
$10 \times 10^{-12} C$
, respectively. Calculate the potential at the fourth corner. (The side
$A B=4 cm$
and
$B C=3 cm )$
VITEEE - 2007
VITEEE
Physics
potential energy
A galvanometer acting as a voltmeter will have
VITEEE - 2007
VITEEE
Physics
Electrical Instruments
A shell of mass
$20\,kg$
at rest explodes into two fragments whose masses are in the ratio
$2 : 3$
. The smaller fragment moves with a velocity of
$6 \,m/s$
. The kinetic energy of the larger fragment is
KCET - 2007
KCET
Physics
work, energy and power
The potential of the electric field produced by a point charge at any point
$(x, y, z)$
is given by
$V= 3x^{2} + 5$
, where
$x, y, z$
are in metres and
$V$
is in volts. The intensity of the electric field at
$(-2,1,0)$
is
KCET - 2007
KCET
Physics
electrostatic potential and capacitance
In Young?? double slit experiment with sodium vapour lamp of wavelength 589 nm and the slits 0.589 mm apart, the half angular width of the central maximum is
KCET - 2007
KCET
Physics
Wave optics
A proton with energy of 2 MeV enters a uniform magnetic field of2.5 T normally. The magnetic force on the proton is (Take mass of proton to be
$1.6 \times 10^{-27} kg )$
VITEEE - 2007
VITEEE
Physics
Magnetic Field
A parallel plate capacitor of capacitance
$100\, pF$
is to be constructed by using paper sheets of
$1\, mm$
thickness as dielectric. If the dielectric constant of paper is
$4$
, the number of circular metal foils of diameter
$2\, cm$
each required for the purpose is
VITEEE - 2007
VITEEE
Physics
Capacitors and Capacitance
Radio carbon dating is done by estimating in specimen
VITEEE - 2007
VITEEE
Physics
Nuclei
The antenna current of an $AM$ transmitter is $8\,A$ when only the carrier is sent, but it increases to $8.93\,A$ when the carrier is modulated by a single sine wave. Find the percentage modulation.
VITEEE - 2007
VITEEE
Physics
work, energy and power
Radar waves are sent towards a moving airplane and the reflected waves are received. When the airplane is moving towards the radar, the wavelength of the wave
VITEEE - 2007
VITEEE
Physics
Waves
The electric field intensity
$\vec{E}$
, due to an electric dipole of moment
$\vec{p}$
, at a point on the equatorial line is
VITEEE - 2007
VITEEE
Physics
Electric Dipole
The output stage of a television transmitter is most likely to be a
VITEEE - 2007
VITEEE
Physics
communication systems
Ionization power and penetration range of radioactive radiation increases in the order
VITEEE - 2007
VITEEE
Physics
Nuclei
Indicate which one of the following statements is not correct?
(a) Intensities of reflections from different crystallographic planes are equal
(b) According to Bragg's law higher order of reflections have high $\theta$ values for a given wavelength of radiation
(c) For a given wavelength of radiation, there is a smallest distance between the crystallographic planes which can be determined
(d) Bragg's law may predict a reflection from a crystallographic plane to be present but it may be absent due to the crystal symmetry
VITEEE - 2007
VITEEE
Physics
Atomic Spectra
In Raman effect, Stoke's lines are spectral lines having
KCET - 2007
KCET
Physics
Atoms
The equation to two circles which touch the Y-axis at
$(0, 3)$
and make an intercept of
$8$
units on X-axis are
KCET - 2007
KCET
Physics
Combination of capacitors
Two condensers, one of capacity
\(C\)
and the other capacity
\(\frac{C}{2}\)
are connected to a
\(V\)
-volt battery, as shown in the figure.
The work done in charging fully both the condensers is
NEET (UG) - 2007
NEET (UG)
Physics
electrostatic potential and capacitance
Two satellites of earth, $ S_1 $ and $ S_2 $ , are moving in the same orbit. The mass of $ S_1 $ is four times the mass of $ S_2 $ . Which one of the following statements is true ?
NEET (UG) - 2007
NEET (UG)
Physics
Gravitation
The principle of
$LASER$
action involves
KCET - 2007
KCET
Physics
Semiconductor electronics: materials, devices and simple circuits
Light from two coherent sources of the same amplitude
$A$
and wavelength
$\lambda$
illuminates the screen. The intensity of the central maximum is
$I_0$
. If the sources were incoherent, the intensity at the same point will be
KCET - 2007
KCET
Physics
Wave optics
A prism of a certain angle deviates the red and blue rays by
$8^\circ$
and
$12^\circ$
respectively. Another prism of the same angle deviates the red and blue rays by
$10^\circ$
and
$14^\circ$
respectively. The prisms are small angled and made of different materials. The dispersive powers of the materials of the prisms are in the ratio
KCET - 2007
KCET
Physics
Ray optics and optical instruments
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