List of practice Questions

The current in a coil changes from 2A to 5A in 0.3s. The magnitude of emf induced in the coil is 1.0V. The value of self-inductance of the coil is
In series LCR circuit at resonance, the phase difference between voltage and current is
The Curie temperatures of Cobalt and iron are 1400K and 1000K respectively. At T = 1600K , the ratio of magnetic susceptibility of Cobalt to that of iron is
A proton and an alpha-particle moving with the same velocity enter a uniform magnetic field with their velocities perpendicular to the magnetic field. The ratio of radii of their circular paths is
The torque acting on a magnetic dipole placed in uniform magnetic field is zero, when the angle between the dipole axis and the magnetic field is _____.
A wire of resistance R is connected across a cell of emf ε and internal resistance r. The current through the circuit is I. In time t, the work done by the battery to establish the current I is
The resistance of a carbon resistor is 4.7 kΩ ± 5% . The colour of the third band is
A charged particle is subjected to acceleration in a cyclotron as shown. The charged particle undergoes increase in its speed
charged particle is subjected to acceleration in a cyclotron
Electric field at a distance ‘r’ from an infinitely long uniformly charged straight conductor, having linear charge density λ is E1. Another uniformly charged conductor having same linear charge density λ is bent into a semicircle of radius ‘r’. The electric field at its centre is E2 . Then
A block of mass m is conducted to a light spring of force constant k. The system is placed inside a damping medium of damping constant b. The instantaneous values of displacement, acceleration and energy of the block are x, a and E respectively. The initial amplitude of oscillation is A and ω' is the angular frequency of oscillations. The incorrect expression related to the damped oscillations is
Pressure of ideal gas at constant volume is proportional to _______.
A stretched wire of a material whose Young's modulus Y = 2 × 1011 Nm-2 has Poisson's ratio of 0.25. Its lateral strain εl = 10-3. The elastic energy density of the wire is
When a planet revolves around the Sun, in general, for the planet
A positively charged glass rod is brought near uncharged metal sphere, which is mounted on an insulated stand. If the glass rod is removed, the net charge on the metal sphere is
A closed water tank has cross-sectional area A. It has small hole at a depth of h from the free surface of water. The radius of the hole is r so that r << \(\sqrt{\frac{A}{\pi}}\). If Po is the pressure inside the tank above water level, and Pa is the atmospheric pressure, the rate of flow of the water coming out of the hole is [ ρ is the density of water]
A closed water tank
Seven identical discs are arranged in a planar pattern, so as to touch each other as shown in the figure. Each disc has mass ‘m’ radius R. What is the moment of inertia of system of six discs about an axis passing through the centre of central disc and normal to plane of all discs?
Seven identical discs
A body is moving along a straight line with initial velocity v0. Its acceleration a is constant. After t seconds, its velocity becomes v. The average velociy of the body over the given time interval is
The true length of a wire is 3.678 cm. When the length of this wire is measured using instrument A, the length of the wire is 3.5 cm. When the length of the wire is measured using instrument B, it is found to have length 3.38 cm. Then the
The moment of inertia of a rigid body about an axis
A radioactive sample has half-life of 3 years. The time required for the activity of the sample to reduce to \(\frac{1}{5}\)th of its initial value is about
The truth table for the given circuit is
Logic gate circuit
If \( α,β,γ\) are the cube roots of \(-2\) ,then the value of \(xα+yβ+zγ/xβ+yγ+zα\) is (\(x,y,z\) are variables)
MTPs are considered relatively safe during
An example for hormone releasing IUD is
Which of the following is abbreviated as ZIFT ?