In the Young's double slit experiment, if the phase difference between the two waves interfering at a point is ∅, the intensity at that point can be expressed by the expression (Where A and B depend upon the amplitudes of the two waves)
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(a) I = |
(b) I = |
(c) I = A + Bcos |
(d) I = A + B Cos∅ |
(d) I = A + B Cos∅
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No current flows between two charged bodies connected together when they have the same
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(a) Capacitance or |
(b) Charge |
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(c) Resistance |
(d) Potential or |
The equivalent resistance between x and y in the circuit shown is
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(a) 10 W |
(b) 40 W |
(c) 20 W |
(d) |
All of the following statements are true except
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(a) Conductance is the reciprocal of resistance and is measured in Siemens |
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(b) Ohm's law is not applicable at very low and very high temperatures |
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(c) Ohm's law is applicable to semiconductors |
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(d) Ohm's law is not applicable to electron tubes, discharge tubes and electrolytes |
The force between the plates of a parallel plate capacitor of capacitance C and distance of separation of the plates d with a potential difference V between the plates, is
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(a) |
(b) |
(c) |
(d) |
Function of rectifier is
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(a) To convert ac into dc |
(b) To convert dc into ac |
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(c) Both (a) and (b) |
(d) None of these |
A conductor with a positive charge
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(a) Is always at +ve potential |
(b) Is always at zero potential |
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(c) Is always at negative potential |
(d) May be at +ve, zero or -ve potential |
An electron (charge q coulomb) enters a magnetic field of H 
with a velocity of vm/s in the same direction as that of the field the force on the electron is
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(a) Hqv Newton’s in the direction of the magnetic field |
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(b) Hqv dynes in the direction of the magnetic field |
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(c) Hqv Newton’s at right angles to the direction of the magnetic field |
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(d) Zero |
The intensity of electric field at a point between the plates of a charged capacitor
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(a) Is directly proportional to the distance between the plates |
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(b) Is inversely proportional to the distance between the plates |
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(c) Is inversely proportional to the square of the distance between the plates |
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(d) Does not depend upon the distance between the plates |
