Sixty-four drops are jointed together to form a bigger drop. If each small drop has a capacitance C, a potential V, and a charge q, then the capacitance of the bigger drop will be
|
(a) C |
(b) 4C |
(c) 16C |
(d) 64C |
(b) 4C
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The line joining the pole and the centre of curvature of a mirror is called the:
A simple microscope has:
'Mirage' is a phenomenon due to
|
(a) Reflection of light |
(b) Refraction of light |
|
(c) Total internal reflection of light |
(d) Diffraction of light |
At a place, if the earth's horizontal and vertical components of magnetic fields are equal, then the angle of dip will be
| (a) 30° | (b) 90° | (c) 45° | (d) 0° |
In an NPN transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector, the emitter current (iE) and base current (iB) are given by
|
(a) iE = – 1 mA, iB = 9 mA |
(b) iE = 9 mA, iB = – 1 mA |
|
(c) iE = 1 mA, iB = 11 mA |
(d) iE = 11 mA, iB = 1 mA |
A current of 2 A passing through conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is
|
(a) 0.5 Ω |
(b) 2 Ω |
(c) 4 Ω |
(d) 20 Ω |