List of top Physics Questions asked in AP ECET Ceramic Tech

Which of the following is a Semiconductor?

The charge carriers in P-type semiconductor is

In a photoelectric experiment, the stopping potential for incident light of wavelength \(4000\ \text{\AA}\) is \(2\ \text{V}\). If the wavelength is changed to \(3000\ \text{\AA}\), the new stopping potential will be approximately \[ (\text{Use }h=4.14\times 10^{-15}\ \text{eV s},\ c=3\times 10^8\ \text{m/s}) \]

In a superconducting ring, a persistent current has been flowing without decay for years. This is possible because

In Optical Fiber communication, the signal is transmitted in the form of

A bubble of an ideal gas rises from the bottom of a lake to the surface. At the bottom, the pressure is \(3\ \text{atm}\) and the temperature is \(7^\circ\text{C}\). At the surface, the pressure is \(1\ \text{atm}\) and the temperature is \(27^\circ\text{C}\). If the initial volume of the bubble was \(V_0\), what is its volume \(V\) at the surface?

The R.M.S. speed of oxygen molecules at \(27^\circ\text{C}\) is \(v\). At \(927^\circ\text{C}\), its R.M.S. speed will be

In an isothermal process

At constant temperature, the product \(PV\) is plotted against pressure \(P\) for an ideal gas. The graph obtained is

If the pressure of an ideal gas is doubled and its absolute temperature is halved, the volume will become

In a closed hall of volume \(5000\ \text{m}^3\), the total absorption of the interior surfaces is \(200\) metric sabin. The reverberation time is

In acoustics, “Noise” is generally characterized by

Two identical piano wires, when tuned to a fundamental frequency of \(400\ \text{Hz}\), produce no beats. One wire is then slightly tightened, and the beat frequency heard is \(2\ \text{Hz}\). What is the new fundamental frequency of the tightened wire?

Power supplied to a particle of mass \(2\ \text{kg}\) varies with time as \[ P=\frac{3t^2}{2}\ \text{watt}, \] where \(t\) is in seconds. If velocity at \(t=0\) is zero, the velocity at \(t=2\ \text{s}\) is

A source of sound of frequency \(500\ \text{Hz}\) is moving towards an observer with velocity \(30\ \text{m/s}\). The speed of sound is \(330\ \text{m/s}\). The frequency heard by the observer will be

A pump is used to deliver water at a certain rate from a given pipe. To obtain twice the volume of water from the same pipe in the same time, by what factor must the power of the motor pump be increased? Assume ideal conditions.

If the volume of a room is doubled and the total absorption is halved, the reverberation time will

A body falling from height \(H\) takes time \(T\) seconds to reach the ground. The time taken to cover the second half of height is

The potential energy of a particle is given by \(U(x)=20+(x-2)^2\), where \(U\) is in joules and \(x\) is in meters. The minimum potential energy and the position where it occurs are

With what speed should a body be thrown upwards so that the distances covered in the \(5^{th}\) second and \(6^{th}\) second are equal?

A body of mass \(1\ \text{kg}\) starts moving from rest under the action of a force which varies with displacement as \(F=2x+5\) in newtons. The work done by this force to displace the body from \(x=0\) to \(x=2\ \text{m}\) is

The magnitudes of three vectors \(\vec A,\vec B,\vec C\) are \(12,5\), and \(13\) units respectively and \(\vec A+\vec B=\vec C\). The angle between \(\vec A\) and \(\vec B\) is

If \(|\vec A+\vec B|=|\vec A-\vec B|\), then the angle between the two vectors \(\vec A\) and \(\vec B\) is

An aeroplane is moving in a circular path with a speed of \(450\ \text{kmph}\). What is the change in velocity in half revolution?

The ratio between maximum and minimum values of two vectors \(\vec A\) and \(\vec B\), where \(A>B\), is \(4:1\). Then the ratio between the magnitudes of two vectors is