The correct symbol for zener diode is
|
(a)
|
(b)
|
(c)
|
(d)
|
The correct symbol for zener diode is
|
(a)
|
(b)
|
(c)
|
(d)
|
(a)
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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 |
Hydrogen atom does not emit X-rays because
| (a) Its energy levels are too close to each other |
| (b) Its energy levels are too apart |
| (c) It is too small in size |
| (d) It has a single electron |
A proton and an electron both moving with the same velocity v enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that
|
(a) Their time periods will be same |
|
(b) The time period for proton will be higher |
|
(c) The time period for electron will be higher |
|
(d) Their orbital radii will be same |
In a diode valve the cathode temperature must be (f = work function)
|
(a) High and ∅ should be high |
(b) High and ∅ should be low |
|
(c) Low and ∅ should be high |
(d) Low and ∅ should be high |
A moving coil galvanometer of resistance 100 is used as an ammeter using a resistance 0.1 The maximum deflection current in the galvanometer is 100A. Find the minimum current in the circuit so that the ammeter shows maximum deflection
|
(a) 100.1 mA |
(b) 1000.1 mA |
(c) 10.01 mA |
(d) 1.01 mA |