List of top Physics Questions asked in KEAM

When a diode is reverse biased
A particle of 100 g mass is projected vertically up with a kinetic energy of 20 J. The maximum height reached by the particle is (\( g = 10 \) m/s\( ^2 \)) (neglecting air resistance).
Young’s double-slit experiment is carried out by using green, red and blue lights, one at a time. The fringe widths recorded are \( \beta_G \), \( \beta_R \) and \( \beta_B \) respectively. Then
In a nuclear fusion process, the masses of the fusing nuclei are \( M_A \) and \( M_B \). Then the mass of the product nucleus \( M_C \) is related to \( M_A \) and \( M_B \) as
If \( E \) is the electric field intensity between the plates of a charged parallel plate capacitor, energy stored per unit volume in it is (permittivity of free space = \( \epsilon_0 \))
A person travels in a car from p to q with uniform speed u and returns to p with uniform speed v. The average speed for his round trip is
The electron concentration \( n_e \) and hole concentration \( n_h \) in semiconductor are related to the number of intrinsic charge concentration \( n_i \) as
The elastic energy stored per unit volume in a stretched wire is: \[ \left( Y = \text{Young's modulus of the material of the wire}; \quad S = \text{stress acting on the wire} \right) \]
The number of de Broglie waves associated with Bohr electron when it completes one revolution in its third orbit is

Choose the INCORRECT dimensions:

An intrinsic semiconductor at \( T = 0 \, {K} \) behaves like
The electric power delivered by a transmission cable of resistance \( R_c \) at a voltage \( V \) is \( P \). The power dissipated is
The coefficient of friction between the road and the tyres of a cyclist is 0.1. The maximum speed with which he can take a circular turn of radius 2 m without skidding is ( \( g = 10 \) m/s\( ^2 \) )
The ratio of the maximum kinetic energy to the maximum potential energy of a bob of a simple pendulum executing small oscillations is
A block of mass 3 kg executes simple harmonic motion under the restoring force of a spring. The amplitude and the time period of the motion are 0.1 m and 3.14 s respectively. The maximum force exerted by the spring on the block is
A constant force of 6 N acting on a stationary body displaces it by 3 m in 2 s. The average power delivered is
An alternative form of Biot-Savart's law is
A particle executes a linear SHM with an amplitude \(a\) and angular velocity \(\omega\). The ratio between its acceleration amplitude and displacement amplitude is
Speed of a transverse wave on a stretched string under tension \(T\) and linear density \(\mu\) is
Mobility \( \mu \) of an electron is related to average collision time \( \tau \) as: \[ \mu = \frac{e \tau}{m} \] (where \( e \) is the electronic charge, and \( m \) is the mass of the electron)
Whenever light travels from rarer medium into denser medium its
Two like charges kept in air medium experience a force \( F \), when they are separated by a certain distance \( r \). When the same charges are kept in a dielectric medium at the same distance of the separation, the force between them is 0.5F. The dielectric constant of the medium is
If the radii of two soap bubbles are respectively 2 cm and 3 cm, then the ratio of the excess pressures inside the soap bubbles is
The ratio of radii of the circular paths of a proton and a deuteron when projected perpendicular to the direction of a uniform magnetic field with the same speed is

The energy stored in the capacitor after closing the key K is