List of top Questions asked in AP EAMCET- 2024

A current-carrying coil experiences a torque due to a magnetic field. The value of the torque is 80% of the maximum possible torque. The angle between the magnetic field and the normal to the plane of the coil is

A wire shaped in a regular hexagon of side 2 cm carries a current of 4 A. The magnetic field at the centre of the hexagon is.
 

A charge ‘q’ is spread uniformly over an isolated ring of radius ‘R’. The ring is rotated about its natural axis with angular speed \( \omega \). The magnetic dipole moment of the ring is:
The relation between \(\mu\) and \(H\) for a specimen of iron is \(\mu = \left[ \frac{0.4}{H} + 12 \times 10^{-4} \right] \text{Hm}^{-1}\). The value of \(H\) which produces flux density of 1 T will be (\(\mu\) = magnetic permeability, \(H\) = magnetic intensity)
Two charges \(5\) nC and \(-2\) nC are placed at points \( (5,0,0) \) and \( (23,0,0) \) in a region of space where there is no other external field. The electrostatic potential energy of this charge system is:
Two point charges +6 \(\mu\)C and +10 \(\mu\)C kept at a certain distance repel each other with a force of 30 N. If each charge is given an additional charge of -8 \(\mu\)C, the two charges
125 identical charged small spheres coalesce to form a big charged sphere. If the electric potential on each small sphere is 60 mV, then the electric potential on the bigger sphere formed is:
Two particles of charges 4 nC and \( Q \) are kept in air with a separation of 10 cm between them. If the electrostatic potential energy of the system is 1.8 μJ, then \( Q \) is:
In a region, the electric field is \( (30\hat{i} + 40\hat{j}) \) NC\(^{-1}\). If the electric potential at the origin is zero, the electric potential at the point (1 m, 2 m) is
A particle of mass 0.5 g and charge 10 \(\mu\)C is subjected to a uniform electric field of 8 NC\(^{-1}\). If the particle is initially at rest, the velocity of the particle after a time of 5 seconds is
The magnitude of an electric field which can just suspend a deuteron of mass \( 3.2 \times 10^{-27} \) kg freely in air is:

Two particles of equal mass \( m \) and equal charge \( q \) are separated by a distance of 16 cm. They do not experience any force. The value of \( \frac{q}{m} \) is                (if \( G \) is the universal gravitational constant and \( g \) is the acceleration due to gravity).

Four condensers each of capacitance 8 muF are joined as shown in the figure. The equivalent capacitance between the points A and B will be
 

When 40 J of heat is absorbed by a monatomic gas, the increase in the internal energy of the gas is
Two soap bubbles of radii \(R_1\) and \(R_2\) are kept in vacuum at constant temperature, the ratio of masses of air inside them are:
The efficiency of a Carnot heat engine is 25% and the temperature of its source is 127°C. Without changing the temperature of the source, if the absolute temperature of the sink is decreased by 10%, the efficiency of the engine is:

Helium gas goes through a cycle ABCDA (consisting of two isochoric and isobaric lines) as shown in figure. Assuming the gas to be an ideal gas. Efficiency of this cycle is nearly:


 

The ratio of kinetic energy of a molecule of neon to that of the oxygen gas at 27°C is
Two samples of same gas (\(\gamma = \frac{3}{2}\)) have equal volume. If their volumes are doubled by adiabatic and isothermal processes respectively for sample 1 and 2. Their final pressures are now equal. The ratio of initial pressures is:
Two ideal gases at absolute temperature \(T_1\) and \(T_2\) are mixed. In this process there is no loss of energy. If the molecular masses are \(m_1\) and \(m_2\), and mole number of the gases are \(n_1\) and \(n_2\), then the final temperature of the mixture is:
One kilogram of a diatomic gas is at a pressure of \(2 \times 10^4 { N/m}^{-2}\) and the density of the gas is \(4 { kg/m}^{-3}\). The internal energy of this gas:

The oxygen gas of 5 moles is heated at constant pressure from 300 K to 320 K. The amount of energy spent during this expansion is 
(For oxygen \( C_p = 7 \, {Cal/mol} \cdot \degree C \), \( C_v = 5 \, {Cal/mol} \cdot \degree C \)) 
 

One mole of a gas having \( \gamma = \frac{7}{5} \) is mixed with one mole of a gas having \( \gamma = \frac{4}{3} \). The value of \( \gamma \) for the mixture is ( \( \gamma \) is the ratio of the specific heats of the gas)

A Carnot heat engine has an efficiency of 10%. If the same engine is worked backward to obtain a refrigerator, then the coefficient of performance of the refrigerator is

Two ideal gases A and B of the same number of moles expand at constant temperatures \( T_1 \) and \( T_2 \) respectively such that the pressure of gas A decreases by \( 50% \) and the pressure of gas B decreases by \( 75% \). If the work done by both the gases is the same, then the ratio \( T_1:T_2 \) is: