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Physics
List of top Physics Questions asked in AFMC
The magnifying power of telescope is high if
AFMC - 2009
AFMC
Physics
Optical Instruments
A ray of light is incident on a plane mirror at an angle of
$60^\circ$
. The angle of deviation produced by the mirror is
AFMC - 2009
AFMC
Physics
Ray optics and optical instruments
A body executes simple harmonic motion under the action of force
$F_{1}$
with a time period
$\frac{4}{5} s$
. If the force is changed to
$F_{2}$
it executes simple harmonic motion with time period
$\frac{3}{5} s$
. If both forces
$F_{1}$
and
$F_{2}$
act simultaneously in the same direction on the body, its time period will be
AFMC - 2009
AFMC
Physics
Oscillations
What is the current through an ideal pn - junction diode shown in figure below?
AFMC - 2009
AFMC
Physics
Semiconductor electronics: materials, devices and simple circuits
Two equal and opposite charge
$(+ q$
and
$- q)$
are situated at
$x$
distance from each other, the value of potential at very far point will depend upon
AFMC - 2009
AFMC
Physics
Electrostatic potential
Suitable impurities are added to a semiconductor depending on its use. This is done to
AFMC - 2009
AFMC
Physics
P-N Junction
A lens behaves as a converging lens in air and diverging lens in water. The refractive index of the material of the lens is
AFMC - 2009
AFMC
Physics
Ray optics and optical instruments
An eye specialist prescribes spectacles having a combination of a convex lens of focal length
$40 \,cm$
in contact with a concave lens of focal length
$25\, cm$
. The power of this lens combination will be
AFMC - 2009
AFMC
Physics
Ray optics and optical instruments
A band playing music at a frequency f is moving towards a wall at a speed
$v_b$
. A motorist is following the band with a speed
$v_m$
. If v be the speed of the sound, the expression for beat frequency heard by motorist is
AFMC - 2009
AFMC
Physics
beats
A diatomic gas is heated at constant pressure. What fraction of the heat energy is used to increase the internal energy?
AFMC - 2009
AFMC
Physics
kinetic theory
In interference pattern, the energy is
AFMC - 2009
AFMC
Physics
Wave optics
A galvanometer coil has a resistance of
$15\, \Omega$
and gives full scale deflection for a current of
$4\, mA$
. To convert it to an ammeter of range
$0$
to
$6\, A$
AFMC - 2008
AFMC
Physics
Current electricity
The effect due to uniform magnetic fie Id on a freely suspended magnetic needle is as follows
AFMC - 2008
AFMC
Physics
Magnetism and matter
For a system to follow the law of conservation of linear momentum during a collision, the condition is (1) total external force acting on the system is zero. (2) total external force acting on the system is finite and time of collision is negligible. (3) total internal force acting on the system is zero.
AFMC - 2008
AFMC
Physics
work, energy and power
Activity of a radioactive sample decreases to
$ (1/3)^{rd} $
of its original value in 3 days. Then, 1 in 9 days its activity will become
AFMC - 2008
AFMC
Physics
Nuclei
A motor is used to deliver water at a certain rate through a given horizontal pipe. To deliver
$n$
-times the water through the same pipe in the same time the power of the motor must be increased as follows
AFMC - 2008
AFMC
Physics
work, energy and power
A machine is delivering constant power to drive a body along a straight line. What is the relation between the distance travelled by the body against time
AFMC - 2008
AFMC
Physics
work, energy and power
A battery of emf
$10\, V$
and internal resistance
$3\, \Omega$
is connected to a resistor. The current in the circuit is
$0.5\, A$
. The terminal voltage of the battery when the circuit is closed is
AFMC - 2008
AFMC
Physics
cells
The physical quantity having the dimensions
$\left[ M ^{-1} L ^{-3} T ^{3} A ^{2}\right]$
is
AFMC - 2008
AFMC
Physics
Dimensional Analysis
When a low flying aircraft passes over head, we sometimes notice a slight shaking of the picture on our
$TV$
screen. This is due to
AFMC - 2008
AFMC
Physics
Waves
A straight wire of mass
$200\, g$
and length
$1.5\, m$
carries a current of
$2\, A$
. It is suspended in mid-air by a uniform horizontal magnetic field
$B$
. The magnitude of
$B$
(in tesla) is (assume
$g=9.8\, ms ^{-2}$
)
AFMC - 2008
AFMC
Physics
Magnetic Field Due To A Current Element, Biot-Savart Law
According to classical theory of Rutherford's model, the path of electron will be
AFMC - 2008
AFMC
Physics
Atoms
An unpolarised beam of intensity
$I_{0}$
is incident on a pair of nicols making an angle of
$60^{\circ}$
with each other. The intensity of light emerging from the pair is
AFMC - 2008
AFMC
Physics
Wave optics
In semiconductor the concentrations of electrons and holes are
$ 8\times 10^{18}m^{3} $
and
$ 5\times 10^{18}/m^{3} $
respectively. If the mobilities of electrons and holes are
$2.3 \,m^2 /Vs$
it and
$0.01 \,m^2 /Vs$
respectively, then semiconductor is
AFMC - 2007
AFMC
Physics
Semiconductor electronics: materials, devices and simple circuits
The length of the wire is doubled, Its conductance will
AFMC - 2007
AFMC
Physics
Electromagnetic induction
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