List of top Physics Questions

In the steady state of temperature, the flow of heat across the body depends upon its:
A. thermal capacity
B. thermal conductivity
C. temperature difference across its opposite faces
D. thermal resistivity
Choose the CORRECT answer from the options given below:
Quantum statistics changes into classical statistics if: (Symbols have their usual meaning)
Fermions have spin value equal to:
Degree of degeneracy will be large when:
Which of the following statements are correct:
A. Specific heat of saturated water vapour at 100\(^{\circ}\)C is negative.
B. There is only one triple point of a substance.
C. Boiling point of every liquid rises with increase in pressure.
D. Latent heat can not become zero.
Choose the CORRECT answer from the options given below:
According to the Dulong and Petit's law, the atomic heat of an element at constant volume:
In the context of conductors in electrostatic equilibrium, the relationship between electric field and the conductor's surface is:
The electric field just outside a charged conductor is E. The electric field just inside the conductor is:
The electric potential inside a charged conducting sphere is constant. The charge distribution inside the sphere will be:
A parallel-plate capacitor has a dielectric slab of thickness d and dielectric constant K inserted between the plates. The capacitance change compared to the vacuum case (when no slab is inserted) is:
If an electromagnetic wave is totally reflected, the radiation pressure in terms of average Poynting vector S\(_{av}\) is:
For a system of particles, if the external net force acting on the system is zero, the system's center of mass is:
The gravitational field at a point in space is:
A siren on a tall pole radiates sound waves uniformly in all directions. At a distance of 15 m from the siren, the sound intensity is 0.250 W/m\(^2\). The intensity of sound at distance 75 m from siren is:
A long, straight wire carries a current of 10 A. The magnitude of the magnetic field at a distance of 5 cm from the wire is:
A conducting sphere of radius R carries a total charge Q. The electric field at a distance r>R from the center is:
A point charge +Q is placed at the origin. The electric potential at point (3a,4a,0) in terms of k, Q and a is:
True conditions for sustained interference of light waves are:
A. Two interfering sources must be coherent.
B. Two interfering waves must be propagated along the same line.
C. Two interfering waves must have equal amplitude.
D. If the interfering waves are polarized, they must be in the same state of polarization.
Choose the correct answer from the options given below:
Inside a uniformly charged spherical shell, the value of the electric field at distance r from the center is:
Which of the following conditions will lead to Anomalous dispersion?
A 20g of cane sugar is dissolved in water to make 50 cc of solution. A 20 cm length of tube filled with this solution causes +53\(^{\circ}\)30' optical rotation. What will be the specific rotation?
A tuning fork of unknown frequency sounded with a tuning fork of frequency 256 Hz produces 4 beats per second. If a small quantity of wax is fixed on first fork so that it produces 3 beats per second with tuning fork, what will be the frequency of first fork (in Hz)?
The resolving power of a grating:
A. increases with increase in total number of lines ruled on grating.
B. increases with increase in total width of grating.
C. increases with increasing the order of spectrum as in Echelon grating.
D. increases with decreasing the order of spectrum as in Echelon grating.
Choose the CORRECT answer from the options given below:
Two thin convex lenses of focal lengths 2 cm and 6 cm are separated by a distance of 4 cm in air. Arrange the following cardinal points in ascending order on basis of their distance from second lens:
A. First Principal Point
B. First Focal Point
C. Second Focal Point
D. Second Nodal Point
When light ray refracts on entering from one medium to another medium of different refractive indices, it follows: