List of top Physics Questions asked in KEAM

A Combination of two charges +1 nC and -1 nC are separated by a distance of 1 μm. This Constituted electric dipole is placed in an electric field of 1000 V/m at an angle of 45 degree. The torque and the potential energy on the electric dipole are:
A Simple pendulum experiment is performed for the value of 'g',the acceleration due to the earth's gravity. The measured value of length of the pendulum is 25 cm with an accuracy of 1 mm and the measured time for 100 oscillations is found to be 100 sec with an accuracy of 1 sec. The percentage uncertainty in the determination of 'g' is:
A magnetic field of (10-4\(\hat{k}\))T exerts a force of (4\(\hat{i}\)-3\(\hat{j}\))x10-12N on a particle having a charge of 10-9 C. The speed of the particle is:
A series LCR circuit consists of a variable capacitor connected to an inductor of inductance 50 mH,resistor of resistance 100 Ω and an AC source of angular frequency 500 rad/s. The value of capacitance so that maximum current may be drawn into the circuit is:
A laser beam with an energy flux of 20 W/cm2 is incident on a non-reflecting surface at normal incidence. If the surface has an area of 30 cm2,the total momentum delivered by the laser in 30 minutes for complete absorption will be:
Which of the following scientific principle is used to produce the ultra-high magnetic fields?

A long wire carrying a current of 5 A lies along the positive Z-axis. The magnetic field the point with position vector \(\vec{r}\) =(\(\hat{i}\)+2\(\hat{j}\)+2\(\hat{k}\)) m will be:(μo=4\(\pi\)×10-7 in SI units)

Identify which type of electromagnetic wave is produced using Klystron or Magnetron valve:

A metallic bullet with an initial velocity of 500 m/s penetrates a solid object and melts. The initial temperature of the bullet is 30°C and its melting point is 280°C. The ratio of total heat generated to the initial kinetic energy of the bullet will be : [Latent heat of fusion of metal=3.0x104 J/kg and specific heat capacity of metal=200 J/kg-K]

The rms speed of a gas having diatomic molecules at temperature T (in Kelvin) is 200 m/s. If the temperature is increased to 4T and the molecules dissociate into monoatomic atoms,the rms speed will become:
A system of ideal gas undergoes a thermodynamic process in which the initial pressure and volume are equal to the final pressure and volume. Let △Q is the heat supplied to the system,△W is the work done by the system and △U is the change in internal energy. The correct option is: 
A heat engine operates between a cold reservoir and a hot reservoir. The engine takes 200 J of heat from the hot reservoir and has the efficiency of 0.4. The amount of heat delivered to the cold reservoir in a cycle is:
Two metallic solid spheres A and B,have radius R and 3R,respectively. The solid spheres are charged and kept isolated. Then,the two spheres are connected to each other through a thin conducting wire. The ratio of the final charge on the spheres A to B is:
The work done W is required by an agent to form a bubble of radius R. An extra amount of work △W is required to increase the radius by △R. If \(\frac{△R}{R}\)=1%,\(\frac{△W}{W}\) is:
A hollow sphere of radius 'r' encloses an electric dipole composed of two charges +q and -q. The net flux of electric field through the surface of the sphere due to the enclosed dipole is:
A Spherical ball is subjected to a pressure of 100 atmosphere. If the bulk modulus of the ball is 1011 N/m2,then change in the volume is:
A string clamped at both the ends has a mass 10gm. length 1m and it is kept under tension of 1N. It is vibrating in the fundamental mode with an amplitude of 1cm .Assuming the standing wave pattern, the maximum acceleration seen in the string is

A ring of radius 1.75 m stands vertically. A small sphere of mass 1kg rolls on the inside of this ring without slipping. If it has a velocity of 10m/s at the bottom of the ring,then its velocity when it reaches the top is:(Take g=10 m/s2)

Line-of-sight communication happens by means of :
The kinetic energy of a particle of mass m1 moving with a speed V is same as the kinetic energy of a solid sphere of mass m2 rolling on the plane surface. If the speed of the Centre of the sphere is also V,then m1/m2 is:

A NOR gate has two input I1 and l2,and one output terminal Y. Which of the following configuration (truth table) is INCORRECT for the NOR gate?

Two identical solid spheres,each of radius 10cm,are kept in contact. If the mass of inertia of this system about the tangent passing through the point of contact is 0.14 kg.\(m^2\) Then mass of each sphere is:

Two satellites A and B are moving around the earth in a circular orbit of radius 2R,respectively. If the kinetic energy of the satellite A is two-times the kinetic energy of the satellite B,the ratio of their masses (mA:mB) is:
An object at rest suddenly explodes into three parts of equal masses. Two of the away at right angles to each other with equal speed of 10 m/s. The speed of the just after the explosion will be: 
A billiard ball of mass ‘M’ moving with velocity ‘v1’ collides with another ball of the same mass but at rest. If the collision is elastic the angle of divergence after the collision is