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Physics
List of top Physics Questions
The molar specific heats of an ideal gas at constant pressure and volume are denoted by $C_p$ and $C_V$ respectively. If $ γ = \frac{C_P}{C_v}$ and R is the universal gas constant, then $C_V$ is equal to
NEET (UG) - 2013
NEET (UG)
Physics
Ideal Gases
The upper half of an inclined plane of inclination θ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given by
NEET (UG) - 2013
NEET (UG)
Physics
Friction
In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths, $λ_1$ =12000 Å and $λ_2$= 10000 Å. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference patter coincide with a bright fringe from the other?
NEET (UG) - 2013
NEET (UG)
Physics
Youngs double slit experiment
A parallel beam of fast moving electrons is incident normally on a narrow shit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct?
NEET (UG) - 2013
NEET (UG)
Physics
Youngs double slit experiment
A plano-convex lens fits exactly into a plano- concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices, $μ_1$ and $μ_2$ and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is
NEET (UG) - 2013
NEET (UG)
Physics
Images Formed By Lenses
Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is 7. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become
NEET (UG) - 2013
NEET (UG)
Physics
Gravitational potential energy
A current loop in a magnetic field
NEET (UG) - 2013
NEET (UG)
Physics
Magnetic Field
A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced
NEET (UG) - 2013
NEET (UG)
Physics
Magnetic Field
A, B and C are three points in a uniform electric field. The electric potential is
NEET (UG) - 2013
NEET (UG)
Physics
Electric Field
When a proton is released from rest in a room, it starts with an initial acceleration $a_0$ towards west. When it is projected towards north with a speed $v_0$ it moves with an initial acceleration 3$a_0$ toward west. The electric and magnetic fields in the room
NEET (UG) - 2013
NEET (UG)
Physics
Electric Field
The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is
NEET (UG) - 2013
NEET (UG)
Physics
Cells, Emf, Internal Resistance
The wettability of a surface by a liquid depends primarily on
NEET (UG) - 2013
NEET (UG)
Physics
Liquid state
A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when
NEET (UG) - 2013
NEET (UG)
Physics
Inductance
The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?
NEET (UG) - 2013
NEET (UG)
Physics
tension
A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is
NEET (UG) - 2013
NEET (UG)
Physics
Wavelength and Frequency
The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from $T_1K$ to $T_2K$ is
NEET (UG) - 2013
NEET (UG)
Physics
Temperature and heat
For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the comes is 20 D. Using this information, the distance between the retina and the comea-eye lens can be estimated to be
NEET (UG) - 2013
NEET (UG)
Physics
Ray optics and optical instruments
A wire of resistance 4Ω is stretched to twice its original length. The resistance of stretched wire would be
NEET (UG) - 2013
NEET (UG)
Physics
Resistance
In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be
NEET (UG) - 2013
NEET (UG)
Physics
Amplifiers
A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is
NEET (UG) - 2013
NEET (UG)
Physics
Rotation with Constant Angular ACceleration
Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is
NEET (UG) - 2013
NEET (UG)
Physics
Electromagnetic Spectrum
In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows: P= $\frac{a^3 b^2}{cd}$ % error in P is
NEET (UG) - 2013
NEET (UG)
Physics
Accuracy, precision of instruments and errors in measurement
The wavelength $λ_e$ of an electron and $λ_p$ of a photon of same energy E are related by
NEET (UG) - 2013
NEET (UG)
Physics
The Photon, the Quantum of Light
A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (given 1 u=931 MeV)
NEET (UG) - 2013
NEET (UG)
Physics
Fusion and Fission
The half life of a radioactive isotope 'X' is 20 years. It decays to another element 'Y' which is stable. The two elements 'X' and 'Y' were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be
NEET (UG) - 2013
NEET (UG)
Physics
Radioactivity
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