List of top Physics Questions asked in KEAM

In a Young's double slit experiment which of the following statements is NOT true?
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 thin convex lens of refractive index 1.5 has a focal length of 10 cm in air. When the lens is immersed in a fluid,its focal length becomes 70 cm. The refractive index of the fluid is

Car P is heading east with a speed V and car Q is heading north with a speed \(\sqrt{3}\). What is the velocity of car Q with respect to car P?

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)

An ideal diatomic gas is made up of molecules that do not vibrate. Its volume compressed by a factor of 32,without any exchange of heat. If the initial and final pressures are P1 and P2,respectively,the ratio P1:P2,is:

A particle at rest starts from the origin with a constant acceleration a that makes an angle 60° with the positive y-axis. If its displacement along y-axis is 10m in time 2s,then the magnitude of a is:
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 small bar magnet lies along the x-axis with its Centre fixed at the origin. If the magnetic field at point (5\(\hat{i}\)) m due to this magnet is 4x106 T,then the magnetic field at point (10\(\hat{j}\)) m will be :

An unpolarised light is incident on a glass slab such that the reflected ray is totally polarised. If the angle of refraction is 30°,the refractive index of the glass is:

The rod PQ slides along 2 parallel rails as shown in the figure. It has a length of 20 cm and is perpendicular to the 2 rails. It performs simple harmonic motion with amplitude 5 cm and frequency 10 Hz. The magnetic field is 10-4T and is directed perpendicular to the plane of paper. What is the peak induced electro-magnetic force?

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 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 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