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Physics
List of top Physics Questions
The frequency of vibrating air column in closed organ pipe is n. If its length be doubled and radius halved, its frequency will be nearly
VMMC Medical - 2007
VMMC Medical
Physics
Oscillations
The escape velocity of a body from the earth is $v_{e}$ . If the radius of earth contracts to $ \frac{1}{4}th $ of its value, keeping the mass of the earth constant, the escape velocity will be
JKCET - 2007
JKCET
Physics
Gravitation
Two free parallel wires carrying currents in the opposite directions
JKCET - 2007
JKCET
Physics
Magnetic Force
Work done in converting one gram of ice at
$ -10^{\circ}C $
into steam at
$100^{\circ}C $
is
JKCET - 2007
JKCET
Physics
thermal properties of matter
A body of mass
$10\, kg$
is acted upon by two forces each of magnitude
$10\, N$
making an angle of
$60^{\circ}$
with each other. Find the net acceleration of the body.
JKCET - 2007
JKCET
Physics
laws of motion
The least angle of deviation for a glass prism is equal to its refracting angle. The refractive index of glass is
$ 1.5 $
. Then the angle of prism is
JKCET - 2007
JKCET
Physics
Refraction of Light
The time period of a freely suspended bar magnet in a field is $2\, \sec$. It is cut into two equal parts along its axis, (hen the time period is
JKCET - 2007
JKCET
Physics
Magnetism and matter
A body is moving with uniform acceleration. covers
$200\, m$
in the first
$2\, s$
and
$220\, m$
in the next
$4\, s$
. Find the velocity in
$m / s$
after
$7\, s$
.
JKCET - 2007
JKCET
Physics
Motion in a straight line
Nuclear fission can be explained based on
JKCET - 2007
JKCET
Physics
Nuclei
Two wires
$A$
and
$B$
are of lengths
$ 40\,cm $
and
$ 30\,cm $
.
$A$
is bent into a circle of radius
$r$
and
$B$
into an arc of radius
$r$
. A current
$i_{1}$
is passed through
$A$
and
$I_2$
through
$B$
. To have the same magnetic inductions at the centre, the ratio of
$I_{1}:I_{2}$
is
JKCET - 2007
JKCET
Physics
Moving charges and magnetism
The angle between magnetic meridian and geographical meridian is known as
JKCET - 2007
JKCET
Physics
the earth's magnetic field
The resistance of a wire at room temperature
$ 30{}^\circ C $
is found to be
$ 10\,\Omega $
. Now to increase the resistance by 10%, the temperature of the wire must be [The temperature coefficient of resistance of the material of the wire is
$ 0.002/{}^\circ C $
]
KEAM - 2007
KEAM
Physics
Resistance
A mass of
$2.0\, kg$
is put on a flat pan attached to a vertical spring fixed on the ground as shown in the figure. The mass of the spring and the pan is negligible. When pressed slightly and released the mass executes a simple harmonic motion . The spring constant is
$200\, N/m$
. What should be the minimum amplitude of the motion so that the mass gets detached from the pan (take
$g = 10 \,m /s^2 $
).
NEET (UG) - 2007
NEET (UG)
Physics
Oscillations
A hollow cylinder has a charge
$q$
coulomb within it. If
$\phi$
is the electric flux in units of voltmeter associated with the curved surface
$B$
, the flux linked with the plane surface
$A$
in units of voltmeter will be-
NEET (UG) - 2007
NEET (UG)
Physics
electrostatic potential and capacitance
A body is released from a great height falls freely towards the earth. Another body is released from the same height exactly a second latter. Then the separation between two bodies,
$2\,s$
after the release of the second body is, nearly
JKCET - 2007
JKCET
Physics
Motion in a straight line
Force per unit length between long parallel wires in the circuit is
$3.6 \times 10^{-3} \, N \, m^{-1}$
. Resistance of the circuit is
COMEDK UGET - 2007
COMEDK UGET
Physics
Moving charges and magnetism
A charge
$Q$
is to be divided into two parts,
$q$
and
$(Q- q)$
, such that force between them is maximum. Then
COMEDK UGET - 2007
COMEDK UGET
Physics
Electric charges and fields
If the diameter of a capillary tube is doubled, the rate of flow ofliquid increases
COMEDK UGET - 2007
COMEDK UGET
Physics
mechanical properties of fluid
In an interference experiment, when a glass plate of refractive index 1.5 is introduced in the path of one of the beams; fringes are displaced by
$x$
. When the glass plate is replaced by another transparent plate of same thickness, shift in the fringe is
$ \frac{3}{2} x .$
Refractive index of
$2^{nd}$
transparent plate is
COMEDK UGET - 2007
COMEDK UGET
Physics
Wave optics
The normal atmospheric pressure can support water column of height L which is, (given density of mercury =
$13600\, kg\, m^{-3}$
)
COMEDK UGET - 2007
COMEDK UGET
Physics
mechanical properties of fluid
A bulb is kept at a depth h inside water of refractive index
$' n' $
. Area of the bright patch on the water surface is
COMEDK UGET - 2007
COMEDK UGET
Physics
Ray optics and optical instruments
The ratio of forces between two point charges in the two cases when their separation is halved and when it is doubled, is
COMEDK UGET - 2007
COMEDK UGET
Physics
Electric charges and fields
To increase the angular width of interference fringes
COMEDK UGET - 2007
COMEDK UGET
Physics
Wave optics
An object radiates at temperature
$127^{\circ} C$
. Temperature. at which radiates 16 times more is
COMEDK UGET - 2007
COMEDK UGET
Physics
thermal properties of matter
The speed of electromagnetic radiation in vacuum
COMEDK UGET - 2007
COMEDK UGET
Physics
radiation
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