Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
Consider the following statements (A) and (B) and identify the correct answer. (A) A zener diode is connected in reverse bias, when used as a voltage regulator. (B) The potential barrier of p-n junction lies between 0.1 V to 0.3 V.
Two conducting circular loops of radii $R_1$ and $R_2$ are placed in the same plane with their centres coinciding. If $R_1 >> R_2$, the mutual inductance $M$ between them will be directly proportional to
A capacitor of capacitance 'C', is connected across an ac source of voltage $V$, given by $V = V_0 \sin \omega t$. The displacement current between the plates of the capacitor, would then be given by
Polar molecules are the molecules
Two charged spherical conductors of radius $R_1$ and $R_2$ are connected by a wire. Then the ratio of surface charge densities of the spheres ($\sigma_1/\sigma_2$) is
Water falls from a height of $60\text{ m}$ at the rate of $15\text{ kg/s}$ to operate a turbine. The losses due to frictional force are $10\%$ of the input energy. How much power is generated by the turbine? ($g = 10\text{ m/s}^2$)
For the given circuit, the input digital signals are applied at the terminals $A$, $B$ and $C$. What would be the output at the terminal $y$?
A dipole is placed in an electric field as shown. In which direction will it move?
The number of photons per second on an average emitted by the source of monochromatic light of wavelength $600\text{ nm}$, when it delivers the power of $3.3 \times 10^{-3}\text{ watt}$ will be ($h = 6.6 \times 10^{-34}\text{ J s}$)
An infinitely long straight conductor carries a current of $5\text{ A}$ as shown. An electron is moving with a speed of $10^5\text{ m/s}$ parallel to the conductor. The perpendicular distance between the electron and the conductor is $20\text{ cm}$ at an instant. Calculate the magnitude of the force experienced by the electron at that instant.
A particle of mass '$m$' is projected with a velocity $v = kv_e$ ($k < 1$) from the surface of the earth. ($v_e$ = escape velocity). The maximum height above the surface reached by the particle is
A series LCR circuit containing $5.0\text{ H}$ inductor, $80\text{ }\mu\text{F}$ capacitor and $40\text{ }\Omega$ resistor is connected to $230\text{ V}$ variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be
A ball of mass $0.15 \text{ kg}$ is dropped from a height $10 \text{ m}$, strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is ($g = 10 \text{ m/s}^2$) nearly
A particular station of All India Radio, New Delhi broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is : [speed of light $c = 3.0 \times 10^8 \text{ ms}^{-1}$]
A uniform conducting wire of length $12a$ and resistance '$R$' is wound up as a current carrying coil in the shape of, (i) an equilateral triangle of side '$a$'. (ii) a square of side '$a$'. The magnetic dipole moments of the coil in each case respectively are
A square loop of side $1\text{ m}$ and resistance $1\text{ }\Omega$ is placed in a magnetic field of $0.5\text{ T}$. If the plane of loop is perpendicular to the direction of magnetic field, the magnetic flux through the loop is
Match List-I with List-II<br><br>Choose the correct answer from the options given below
Plane angle and solid angle have
Two objects of mass $10\text{ kg}$ and $20\text{ kg}$ respectively are connected to the two ends of a rigid rod of length $10\text{ m}$ with negligible mass. The distance of the center of mass of the system from the $10\text{ kg}$ mass is
The energy that will be ideally radiated by a $100\text{ kW}$ transmitter in $1\text{ hour}$ is