In the given figure the capacitors 
have a capacitance 4mF each if the capacitor 
has a capacitance 10mF, then effective capacitance between A and B will be
|
(a) 2mF |
(b) 4mF |
(c) 6mF |
(d) 8mF |
(b) 4mF
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The graph Shows the variation in magnetic flux ∅(t) with time through a coil. Which of the statements given below is not correct
|
(a) There is a change in the direction as well as magnitude of the induced emf between B and D |
|
(b) The magnitude of the induced emf is maximum between B and C |
|
(c)There is a change in the direction as well as magnitude of induced emf between A and C |
|
(d) The induced emf is zero at B |
A 4μF conductor is charged to 400 volts and then its plates are joined through a resistance of 1kΩ. The heat produced in the resistance is
|
(a) 0.16 J |
(b) 1.28 J |
(c) 0.64 J |
(d) 0.32 J |
The peak voltage in the output of a half-wave diode rectifier fed with a sinusoidal signal without filter is 10 V. The dc component of the output voltage is
|
(a) 10/ |
(b) 10/p V |
(c) 10 V |
(d) 20/p V |
Electroplating does not help in
|
(a) Fine finish to the surface |
(b) Shining appearance |
|
(c) Metals to become hard |
(d) Protect metal against corrosion |
The capacity of a parallel plate condenser is 10 μF, when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm, then the capacity of this parallel plate condenser will be
|
(a) 5 μF |
(b) 10 μF |
(c) 20 μF |
(d) 40 μF |
A student has 10 resistors of resistance ‘r’. The minimum resistance made by him from given resistors is
|
(a) 10 r |
(b) |
(c) |
(d) |
