List of top Physics Questions asked in AP EAPCET

The transition of an electron in hydrogen atom that emits a photon whose wavelength lies in the ultraviolet region of the electromagnetic spectrum is

The relation between the mean life time \( \tau \) and the half life time \( T_{1/2} \) of a radioactive substance is:

A carrier wave of peak voltage 15 V is used to transmit a message signal. If the modulation index is 60%, then the peak voltage of the modulating signal is

A p-n junction diode is reverse biased with a voltage of 8 V. If the resistance of the diode is \( 4 \times 10^7 \, \Omega \), then the reverse saturation current is

A solenoid has a core of a material with relative permeability 400. The windings of the solenoid are insulated from the core and carry a current of 4 A. If the number of turns is 500 per metre, then the magnetizing field is:

The frequency of ac at which 16 \(\mu F\) capacitor and \( \frac{10}{\pi} \) mH inductor will have same reactance is:

In an ac generator, if a coil of \( N \) turns and area \( A \) is rotated at \( \nu \) revolutions per second in a uniform magnetic field \( B \), then the motional emf produced is equal to \[ (t = 0 s, the coil is perpendicular to the field) \]

The average power output of a point source of an electromagnetic radiation is 1080 W. The maximum value of the rms value of the electric field at a distance of 3 m from the source is

A magnetic field intensity at the centre of a circular wire of radius 0.1 m carrying a current 0.2 A is:

The velocity of a particle A is 3 times the velocity of proton. If the ratio of the de Broglie wavelengths of the particle A and the proton is 3:2, the mass of the particle A is:

When a resistance \( R_1 \) is connected across a cell, the current is \( I_1 \) and if the resistance \( R_1 \) is replaced by \( R_2 \), the current is \( I_2 \). Then the internal resistance of the cell is:

Two square shaped metal plates of side 1 m, kept 0.01 m apart in air form a parallel plate capacitor. It is connected to a battery of 500 V. The plates of the capacitor are then immersed in an insulating oil by lowering the plates vertically with a speed of 0.001 ms\(^{-1}\). If the dielectric constant of the oil is 11, then current drawn from the battery during this process is

The property of light which cannot be explained by Huygen's construction of wavefront is:

The electric field \( \mathbf{E} \) in a region is given by \( \mathbf{E} = 3\hat{i} + 5\hat{j} \). The net electric flux through a square area of side 2 m parallel to y - z plane is

The specific heat capacity of a copper block of mass \( M \) is \( s \). If the mass of the copper block is doubled, the specific heat capacity will be:

Blue colour of the sky is due to

2 moles of a monatomic gas requires heat energy \( Q \) to be heated from 30°C to 40°C at constant volume. The heat energy required to raise the temperature of 4 moles of a diatomic gas from 28°C to 33°C at constant volume is:

A block of steel of mass 2 kg slides down a rough inclined plane of inclination of \( \sin^{-1} \left( \frac{3}{5} \right) \) at a constant speed. The temperature of the block as it slides through 80 cm, assuming that the mechanical energy lost is used to increase the temperature of the block is nearly:

Isothermal bulk modulus of a gas at a pressure \( P \) is:

Small amplitude progressive wave in a stretched string has a speed of \( 100 \, \text{cm/s} \) and frequency \( 100 \, \text{Hz} \). The phase difference between two points 2.75 cm apart on the string, in radians, is:

A vessel of volume 10 liters is filled with \( H_2 \) gas. The total average translational kinetic energy of its molecules is \( 4.5 \times 10^5 \, \text{J} \). The pressure of hydrogen in the vessel is:

The maximum possible height of a mountain on Earth is approximately.

The range of a projectile of weight \( W \) is \( R \). The average torque on the projectile between the initial and final positions \( P \) and \( Q \) about the point of projection is:

A force of \( (2\hat{i} + 3\hat{j} + 4\hat{k}) \, \text{N} \) acts on a particle whose position vector with respect to the origin of the coordinate system is \( (6\hat{i} + b\hat{j} + 12\hat{k}) \, \text{m} \). If the angular momentum of the body is constant, the value of \( b \) is: