List of top Physics Questions

The light emitting diode (LED) is
If the heights of transmitting and the receiving antennas are each equal to $h$, the maximum line-of-sight distance between them is (R is the radius of earth)
In a simple pendulum experiment, the maximum percentage error in the measurement of length is 2% and that in the observation of the time-period is 3%. Then the maximum percentage error in determination of the acceleration due to gravity \( g \) is
A point-to-point communication mode is seen in
The ionospheric layer acts as a reflector for the frequency range
The significant result deduced from the Rutherford’s scattering experiment is that
The collector resistance and the input resistance of a CE amplifier are respectively 10 k\(\Omega\) and 2 k\(\Omega\). If \(\beta\) of the transistor is 49, the voltage gain of the amplifier is
The inputs A, B and C to be given in order to get an output Y = 1 from the following circuit are
On an average, the number of neutrons and the energy of a neutron released per fission of a uranium atom are respectively
If the frequency of incident light falling on a photosensitive metal is doubled, the kinetic energy of the emitted photoelectron is
The half-life of a radioactive substance is 20 minutes. The time taken between 50% decay and 87.5% decay of the substance will be
The ratio of the surface area of the nuclei \(_{52}\text{Te}^{125}\) to that of \(_{13}\text{Al}^{27}\) is
The apparent flattening of the sun at sunset and sunrise is due to
The polarising angle for a medium is found to be \( 60^\circ \). The critical angle of the medium is
Light of wavelength 5000 \r{A is incident normally on a slit of width $2.5 \times 10^{-4}$ cm. The angular position of second minimum from the central maximum is}
In Young's double slit experiment, to increase the fringe width
An electron of mass \(m_e\) and a proton of mass \(m_p\) are accelerated through the same potential. Then the ratio of their de Broglie wavelengths is
Identify the mismatch in the following
In a plane electromagnetic wave, the electric field of amplitude \( 1 \text{ V m}^{-1} \) varies with time in free space. The average energy density of magnetic field is (in \( \text{Jm}^{-3} \))
Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space?
A conducting ring of radius 1 m kept in a uniform magnetic field B of 0.01 T, rotates uniformly with an angular velocity 100 rad s\(^{-1}\) with its axis of rotation perpendicular to B. The maximum induced emf in it is
A step down transformer increases the input current 4 A to 24 A at the secondary. If the number of turns in the primary coil is 330, the number of turns in the secondary coil is
Identify the correctly matched pair
The polarity of induced emf is given by
If the radius of the dees of cyclotron is \(r\), then the kinetic energy of a proton of mass \(m\) accelerated by the cyclotron at an oscillating frequency \(\nu\) is