A hollow sphere of charge does not produce an electric field at any
Options
(a) Point beyond 2 metres (b) Point beyond 10 metres (c) Interior points (d) Outer points
Correct Answer:
Interior […]
A pure semiconductor behaves slightly as a conductor at
Options
(a) Room temperature (b) Low temperature (c) High temperature (d) Both b and c
Correct Answer:
Room temperature
Explanation:
No explanation available. Be […]
Avalanche breakdown is due to
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(a) Collision of minority charge carrier (b) Increase in depletion layer thickness (c) Decrease in depletion layer thickness (d) none of these
Correct Answer:
Collision of minority […]
A leaf which contains only green pigments is illuminated by a laser light of wavelength 0.6328 μm. It would appear to
Options
(a) black (b) green (c) brown (d) red
Correct Answer:
black
In a coil having e.m.f. of 8 V induced for 0.05 s. The value of current changes from 2 A to 4 A. The value of coefficient of self induction of the coil is
A straight conductor of length 0.4 m is moved with a speed of 7 ms⁻¹perpendicular to a magnetic field of intensity 0.9 Wbm⁻². The induced emf across the conductor is
Options
(a) 5.04 […]
Which one of the following statements is WRONG in the context of X-rays generated from a X-ray tube?
Options
(a) Wavelength of characteristic X-rays decreases when the atomic number of the target increases […]
A photocell employs photoelectric effect to convert
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(a) Change in the frequency of light into a change in the electric current (b) Change in the frequency of light into a change in […]
Characteristic X-rays are produced due to
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(a) Transfer of momentum in collision of electrons with target atoms (b) Transition of electrons from higher to lower electronic orbits in an atom (c) Heating […]
A galvanometer having resistance of 50 Ω requires a current of 100μA to give full scale deflection. How much resistance is required to convert it into an ammeter of range of 10A?
Options
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