- ARadially outward.
- BRadially inward.
- CBoth a and b.
- DNone.
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Quantity that remains unchanged in a transformer is
|
(a) Voltage |
(b) Current |
(c) Frequency |
(d) None of the above |
You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90º. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of incidence?
When NPN transistor is used as an amplifier
|
(a) Electrons move from base to emitter |
|
(b) Electrons move from emitter to base |
|
(c) Electrons moves from base to emitter |
|
(d) Holes moves from base to emitter |
The correct graph between the maximum energy of a photoelectron and the inverse of wavelength of the incident radiation is given by the curve

|
(a) A |
(b) B |
(c) C |
(d) None of the above |
A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of
|
(a) Sky wave |
(b) Ground wave |
(c) Sea wave |
(d) Both (a) and (b) |