A device which converts electrical energy into mechanical energy is
|
(a) Dynamo |
(b) generator |
(c) Electric motor |
(d) Induction coil |
A device which converts electrical energy into mechanical energy is
|
(a) Dynamo |
(b) generator |
(c) Electric motor |
(d) Induction coil |
(c) Electric motor
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A 4 μF condenser is connected in parallel to another condenser of 8 μF. Both the condensers are then connected in series with a 12 μF condenser and charged to 20 volts. The charge on the plate of 4 μF condenser is
|
(a) 3.3 μC |
(b) 40 μC |
(c) 80 μC |
(d) 240 μC |
A star which appears blue will be
|
(a) As hot as the sun |
(b) Cooler than the sun |
|
(c) Very cold indeed |
(d) Much hotter than the sun |
Solid targets of different elements are bombarded by highly energetic electron beams. The frequency (f) of the characteristic X-rays emitted from different targets varies with atomic number Z as
|
(a) f ∝ |
(b) f ∝ |
(c) f ∝ Z |
(d) f ∝ |