The capacity of a parallel plate condenser is C. Its capacity when the separation between the plates is halved will be
|
(a) 4 C |
(b) 2C |
(c) |
(d) |
(b) 2C
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If the dielectric constant and dielectric strength be denoted by k and x respectively, then a material suitable for use as a dielectric in a capacitor must have
|
(a) High k and high x |
(b) High k and low x |
(c) Low k and low x |
(d) Low k and high x |
The Boolean equation of NOR gate is
|
(a) C = A + B |
(b) C = |
(c) C = A× B |
(d) C = |
Eels are able to generate current with biological cells called electroplaques. The electroplaques in an eel are arranged in 100 rows, each row stretching horizontally along the body of the fish containing 5000 electroplaques. The arrangement is suggestively shown below. Each electroplaques has an emf of 0.15 V and internal resistance of 0.25 W
The water surrounding the eel completes a circuit between the head and its tail. If the water surrounding it has a resistance of 500 W, the current an eel can produce in water is about
|
(a) 1.5 A |
(b) 3.0 A |
(c) 15 A |
(d) 30 A |
A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased, then
|
(a) No interference is observed |
(b) Fringe width increases |
|
(c) Fringe width decreases |
(d) Fringe width remains same |
