List of top Physics Questions asked in AP EAMCET

The electric field for an electromagnetic wave is given by \( E = 40 \sin(kz - 6 \times 10^8 t) \), where the magnitude of \( E_0 \) is in V/m.
The magnitude of the wave vector \( k \) is

Eddy currents are produced when

A transmitter of power 10 kW emits radio waves of wavelength 500 m. The number of photons emitted per second by the transmitter is of the order of:

Which of the following produces electromagnetic waves?

A pair of adjacent coils has a mutual inductance of 80 mH. If the current in one coil changes from 10 A to 25 A in a time of 1.5 s, the change of flux linked with the other coil is:

A boat man finds that he can save 8 s in crossing a river by quickest path than by the shortest path. If the velocity of the boat and the river flow are 13 m/s and 12 m/s respectively, then the width of the river is:

The reading of a pressure-meter attached to a closed pipe (with water) is \(3.5 \times 10^5 \, {Nm}^{-2}\). On opening the valve of the pipe, the reading is reduced to \(3.0 \times 10^5 \, {Nm}^{-2}\). The speed of the water flowing out the pipe is:

The period of oscillation of a particle in simple harmonic motion is 4 s, and its amplitude is 4 cm. Then the distance of the particle in \( \frac{1}{3} \) seconds after passing the mean position is:

A car is moving on a horizontal curved road of radius 50 m. If the friction coefficient between tyres and road is 0.34, the approximate maximum speed of the car will be nearly:

The resultant capacitance of parallel combination of two capacitors \( C_1 \) and \( C_2 \) is 20 µF. When these capacitors are individually connected to a voltage source of 1V, then the energy stored in \( C_2 \) is 9 times that of \( C_1 \). If these two capacitors are connected in series, the resultant capacitance value is:

200 g of water is heated from 40°C to 60°C. The change in its internal energy [No expansion is taken place] specific heat of water is 4200 J kg⁻¹ K⁻¹

Which one of the following is not classified as pulse modulation?

Two resistors of resistances \( (20 \pm 0.2) \, \Omega \) and \( (10 \pm 0.1) \, \Omega \) are connected in series. The equivalent resistance of the combination is:

The ratio of the wavelengths of the first and second Balmer lines of the hydrogen spectrum is:

An inductor of inductive reactance 80 \(\Omega\) and a resistor of resistance 60 \(\Omega\) are connected in series to an ac source. The impedance and the power factor of the circuit are respectively:

Relative permeability (\(\mu_r\)) of a sample is given by \(1<\mu_r<1 + \epsilon\), where \(\epsilon\) is a small positive number. Then the nature of the sample is:

In Young's double slit experiment, the intensity on the screen where the path difference between the two interfering waves is \( \frac{\lambda}{4} \) is \( K \). What will be the intensity at the point where the path difference is \( \frac{\lambda}{4} \)?

In the given circuit the currents are \( I_1 = 5A \), \( I_4 = 10A \), and \( I_5 = 15A \). Analyzing the circuit using Kirchhoff’s laws, then \( I_2 \), \( I_3 \), and \( I_6 \) values are:

A carrier wave of peak voltage 16 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?

The speed of a projectile at its maximum height is \( \frac{\sqrt{3}}{2} \) times its initial speed. If the range of the projectile is \( n \) times the maximum height attained by it, then \( n \) is equal to:

A metallic wire of resistance 30 \( \Omega \) is bent in the form of an equilateral triangle. The resistance between any two vertices of the triangle is:

In the given figures of logic gates, if the inputs are A=1, B=0, and C=1, find the values of \( y_1 \), \( y_2 \), and \( y_3 \) respectively.

The time gap between 44% decay and 93% decay of a radioactive substance is 81 minutes. The half-life of the radioactive substance in minutes is:

In amplitude modulation, the amplitude of the carrier signal is 28 V and the modulation index is 0.4. The amplitude of the side bands is:

A unit positive charge is moved from point A to point B by a distance of 20 cm, on an equipotential surface as shown in the figure. The work done to move this charge is: