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Four resistances 4 Ω, 8Ω, XΩ and 12Ω are connected in a series to form Wheatstone’s network. If the network is balanced, the value of X is ______.
Concept: Wheatstone Bridge
What is the basis of Kirchhoff’s current law and voltage law?
Concept: Kirchhoff’s Laws of Electrical Network
Are Kirchhoff’s laws applicable to both AC and DC circuits?
Concept: Kirchhoff’s Laws of Electrical Network
Two cells of emf 4 V and 2 V having a respective internal resistance of 1 Ω and 2 Ω are connected in parallel, so as to send current in the same direction through an external resistance of 5 Ω. Find the current through the external resistance.
Concept: Kirchhoff’s Laws of Electrical Network
To convert a moving coil galvanometer into an ammeter we need to connect a ______.
Concept: Moving Coil Galvanometer
Draw a neat labelled diagram for the construction of 'cyclotron'
Concept: Cyclotron
Determine the change in wavelength of light during its passage from air to glass. If the refractive index of glass with respect to air is 1.5 and the frequency of light is 3.5 x 1014 Hz, find the wave number of light in glass.
[Velocity of light in air c = 3 x 108 m/s]
Concept: Reflection and Refraction of Plane Wave at a Plane Surface Using Wave Fronts
Wavelengths of two notes in the air are`[70/153]^m` and `[70/157]^m`. Each of these notes produces 8 beats per second with a tuning fork of fixed frequency. Find the velocity of sound in the air and frequency of the tuning fork.
Concept: Beats
In a cyclotron, magnetic field of 3·5Wb/m2 is used to accelerate protons. What should be the time interval in which the electric field between the Dees be reversed?
(Mass of proton = 1· 67 x 10-27Kg, Charge on proton =1·6x10-19c).
Concept: Cyclotron
On the basis of Huygens' wave theory of light prove that velocity of light in a rarer medium is greater than velocity of light in a denser medium.
Concept: Huygens Principle
In Doppler effect of light, the term “red shift” is used for ______.
(A) frequency increase
(B) frequency decrease
(C) wavelength decrease
(D) frequency and wavelength increase
Concept: Beats
If a watch-glass containing a small quantity of water is placed on two dissimilar magnetic poles, then water ______.
Concept: Cyclotron
Doppler effect is not applicable when _______.
(A) source and observer are at rest.
(B) there is a relative motion between source and observer.
(C) both are moving in opposite directions.
(D) both are moving in same direction with different velocities
Concept: Beats
Explain the construction of plane wavefront using Huygens’ principle.
Concept: Huygens Principle
The working of RADAR is based on ...............
a) resonance
b) speed of a star
c) Doppler effect
d) speed of rotation of sun
Concept: Beats
Determine the change in wavelenght of light during its passage from air to glass, if the refracrtive index of glass with respect to air is 1.5 and the frequency of light is 5 x 1014 Hz. Find the wave number of light in glass (velocity of light in air c = 3 X 108 m/s)
Concept: Wave Theory of Light
Apparent frequency of the sound heard by a listener is less than the actual frequency of sound emitted by source. In this case _______.
(A) listener moves towards source
(B) source moves towards listener
(C) listener moves away from the source.
(D) source and listener move towards each other.
Concept: Beats
The minimum angular separation between two stars is 4 × 10−6 rad, if telescope is used to observe them with an objective of aperture 16 cm. Find the wavelength of light used.
Concept: Wave Theory of Light
State any four applications of Doppler effect
Concept: Beats
Explain Ampere’s circuital law.
Concept: Ampere’s Circuital Law
