- AKilojoule (KJ)
- BJoules (J)
- CWatt (W)
- DKilowatt (KW)
Explanation:
Electric energy is defined as the total electric work done or energy supplied by the source of emf in maintaining the current in an electric circuit for a given time. The SI unit of electrical energy is joule (J). The commercial unit of electric energy is kilowatt-hour (kWh).
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A person wears glasses of power – 2.0 D. The defect of the eye and the far point of the person without the glasses will be
|
(a) Nearsighted, 50 cm |
(b) Farsighted, 50 cm |
(c) Nearsighted, 250 cm |
(d) Astigmatism, 50 cm |
In the connections shown in the adjoining figure, the equivalent capacity between A and B will be

|
(a) 10.8 μF |
(b) 69 μF |
(c) 15 μF |
(d) 10 μF |
For total internal reflection to take place, the angle of incidence i and the refractive index μ of the medium must satisfy the inequality
|
(a) |
(b) |
(c) sin i < |
(d) sin i > |
Wave which cannot travel in vacuum is
|
(a) X-rays |
(b) Infrasonic |
(c) Ultraviolet |
(d) Radiowaves |