- AAmpere
- BPotential
- CWatt
- DVolt
Explanation:
EMF is defined as the voltage developed by the electrical energy source. For example : Battery Thus EMF has the unit of volt denoted by V
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A microscope is focussed on a coin lying at the bottom of a beaker. The microscope is now raised up by 1 cm. To what depth should the water be poured into the beaker so that coin is again in focus ? (Refractive index of water is
)
|
(a) 1 cm |
(b) |
(c) 3 cm |
(d) 4 cm |
The capacitance of an air filled parallel plate capacitor is 10μμF . The separation between the plates is doubled and the space between the plates is then filled with wax giving the capacitance a new value of 40
. The dielectric constant of wax is
|
(a) 12.0 |
(b) 10.0 |
(c) 8.0 |
(d) 4.2 |
The magnifying power of a simple microscope can be increased if we use an eyepiece of:
The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatts. What should be the value of the resistor R, connected in series with the diode for obtaining maximum current

|
(a) 1.5 W |
(b) 5 W |
(c) 6.67 W |
(d) 200 W |
What is the effective capacitance between points X and Y

|
(a) 24 μF |
(b) 18 μF |
(c) 12 μF |
(d) 6 μF |