Physics Test - 4

In a series LCR circuit, resistance R = 10Ω and the impedance Z = 20Ω. The phase difference between the current and the voltage is

The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then

When the current in a coil is changed from 10 A in one direction to 10 A in opposite direction in 0.5 s, an e.m.f. of 1 V is induced in it. Self-inductance of the coil is

A wheel starts from rest and rotates through 1000 radians in 10 s under the action of a constant torque. If the moment of inertia of the wheel is 4 kg m², the torque acting on the wheel is

The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5 Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell

A body of mass 2Kg moving with a velocity of 6 ms^-1 strikes inelastically another body of same mass at rest. The amount of the heat evolved during collision is

A proton and an alpha particle are accelerated through a potential difference of 100 V. The ratio of the wavelength associated with the proton to that associated with an alpha particle is

The reason for the change in shape of a regular body is

For a square wave response (with respect to its maximum response), the rise time of a transistor is defined as the time duration in which its response varies:

An electric dipole is kept in a uniform electric field. It experiences