List of top Physics Questions

A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of the slit is
When a point object is seen by an observer through a glass slab, the image is:
The radius of the third Bohr orbit is $ 4.77\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,. $ The radius of the second orbit will be:
On a cold morning, a metal surface will feel colder to touch than a wooden surfaces, because
A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence $45^\circ$. The ray undergoes total internal reflection. If n is the refractive index of the medium with respect to air, select the possible value (s) of n from the following
Woollen clothes keep the body warm, because wool
Two coils have a mutual inductance 0.005 H. The current changes in the first coil according to equation $I = I_0 sin \omega t, \, $ where $I_0= 10 A $ and $ \omega= 100 \pi$ rad/sec. The maximum value ofe.m.f. in the second coil is
The transfer ratio $\beta$ of a transistor is $50$. The input resistance of the transistor when used in the common-emitter configuration is $1 k\Omega$ The peak value of the collector A.C. current for an A.C. input voltage of 0.01 V peak is
The SI unit of the inductance, the henry can by written as
The rain drops are spherical in shape due to
The electric field required to keep a water drop of mass in just to remain suspended, when charged with one electron:
The best material for the core of a transformer, is
Longitudinal strain is possible in
Light appears to travel in a straight line, because
If a person with a spring balance and a body hanging from it goes up and up in an aeroplane, then the reading of the weight of the body as indicated by the spring balance, will
Heat travels through vaccum by
Gravitational mass is proportional to gravitational
The ratio $C_p /C_v$ for a diatomic gas is more than that for a monotomic gas. The molecules of a monotomic gas have more degree of freedom than those of a diatomic gas.
Newton?? rings are formed in the reflected system. When the space between the lens and the glass plate is filled with a liquid of refractive index greater than that of glass, the central spot of the pattern is bright. This is because the reflections in these cases will be from a denser to a rarer medium and the two interfering rays are reflected under similar conditions.
In series LCR circuit, the resonance occurs at one frequency only. At resonance the inductive reactance is equal and opposite to the capacitive reactance.
According to Maxwell?? hypothesis, a changing electric field gives rise to
A spring $40 \,mm$ long is stretched by the application of a force. If $10 \,N$ force required to stretch the spring through $1 \,mm$, then work done in stretching the spring through $40\, mm$, is
All the resistors are equal in value each being 2 ohm. The equivalent resistance of the combination is:
When light of wavelength $ \lambda $ falls on a thin film of thick- ness t and refractive index n, the essential conditions for the production of constructive interference fringes by the rays A and B is: (m = 1,2,3,...)
Velocity of light, according to this theory, is greater in a denser medium than in a rarer medium