Multiple Choice QuestionsWhen sound waves travel from air to water which one of the following remains constant?
Time period
Frequency
Velocity
Wavelength
B.
Frequency
Sound propagated in the form of longitudinal waves. When sound travels from one medium to another, both its velocity and wavelength undergo change. The velocity of sound in a given is obtained by equation
v = nλ
Where n - frequency of sound and λ is the wavelength of the medium. The velocity of sound is directly proportional to the wavelength.
The frequency of sound depends upon the source of the sound, not the medium of propagation. Hence, it does not change.
A choke is preferred to a resistance for limiting current in AC circuit because
choke is cheap
there is no wastage of power
choke is compact in size
choke is a good absorber of heat
A current of 5A is passing through a metalic wire of cross-sectional area 4 × 10-6 m2 . If the density of charge carriers of the wire is 5 × 1026 m-3, then the drift velocity of the electrons will be
1 × 102 m/s
1.56 × 10-2 m /s
1.56 × 10-3 m/s
1 × 10-2 m/s
A galvanometer can be changed into an ammeter by using
low resistance shunt in series
low resistance shunt in parallel
high resistance shunt in series
high resistance shunt in parallel
A proton moving vertically downward enters a magnetic field pointing towards north. In which direction proton will deflect?
East
West
North
South
Induced emf in the coil depends upon
conductivity of coil
amount of flux
rate of change of linked flux
resistance of coil
X-rays are used in determining the molecular structure of crystalline because
its energy is high
it can penetrate the material
its wavelength is comparable to interatomic distance
its frequency is low
Kirchhoff's law of junction, ΣI = 0, is based on
conservation of energy
conservation of charge
conservation of energy as well as charge
conservation of momentum
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