List of practice Questions

A ball hits the floor and rebounds after an inelastic collision. In this case

In figure E and V_cm represent the total energy and speed of centre of mass of an object of mass 1kg in pure rolling. The object is :

A 1 kg ball moving at 12 ms^-1 collides with a 2 kg ball moving in opposite direction at 24 ms^-1. If the coefficient of restitution is \(\frac{2}{3}\), then the velocities after the collision are

A coin placed on a rotating turn table just slips if it is placed at a distance of 4 cm from the centre. If the angular velocity of the turn table is doubled it will just slip at a distance of :

A particle starts from the origin at t = 0s with a velocity of \(10\hat{j}\) ms^-1 and move in the x-y plane with a constant acceleration of \((8\hat{i}+2\hat{j})\) ms^-2 . At an instant when the x-coordinate of the particle is 16 m, y-coordinate of the particle is:

For a projectile motion, the angle between the velocity and acceleration is minimum and acute at

The trajectory of projectile is

The maximum range of a gun on horizontal plane is 16 km. If g = 10ms^-2 , then muzzle velocity of a shell is

A particle starts from rest. Its acceleration ‘a’ versus time ‘t’ is shown in the figure. The maximum speed of the particle will be:

For a body moving along a straight line, the following v-t graph is obtained.

According to the graph, the displacement during

Identify the correct side elevation view for the given 3D object from the view point of the given arrow.

If one cell is connected wrongly in a series combination of four cells each of e.m.f. 1.5 V and internal resistance of 0.5 Ω, then the equivalent internal resistance of the combination is

In an electromagnetic wave, the oscillating electric and magnetic field vectors are oriented in

Electromagnetic waves against their detection devices are matched below. The mismatch is

The total intensity of earth's magnetic field at the poles is 7 units. Its value at the equator is

Among vadous circuits coDstructed with rcsistor _R, inductor _L and capacitor C, the cicuit that gives maximum power dissipation is

If air core is replaced by an iron core in an inductor, its self-inductance is increased from 0.02 mH to 40 mH. The relative permeabiliry of iron is

If $B_c$ is the magnetic induction at the ceflte ofa circular coit carrying curreflt, then the magnetic induction at a poitrt oo the axis of the coil at a distance equal to the radius of the coil is

The hard ferromagnetic material among the following is

In Cyclotron, the frequency of revolution ofthe charged particle in a magnetic field is independent of

A current carrying coil placed in a magnetic field B experiences a torque τ. If θ is the angle between the normal to the plane of the coil and field B and φ is the flux linked with the coil, then

A carbon resistor is marked with the rings coloured blue, black, rcd and silver. lts rcsistance in ohm is

A conductor of length 20 cm carrying a curent of 5A is placed at an angle of 30° to the extemal magnetic field of 0.5 T. The.force acting on it is

A Wheatstone network is balanced with respective resisto$ 5Ω. l0Ω. 20 Ω and 40 Ω in tbe P. 0. R and S arms. If a 40 Ω) resisror is connecred across S arm. Then the bridge is again balanced by connecting

The magnitude of tfie drift velocity per unit electric field is defined as