All six capacitors shown are identical, Each can withstand maximum 200 volts between its terminals. The maximum voltage that can be safely applied between A and B is
|
(a) 1200 V |
(b) 400 V |
(c) 800 V |
(d) 200 V |
(b) 400 V
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Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be
|
(a) In the circuit (1) and (2) |
(b) In the circuit (2) and (3) |
| (c) In the circuit (1) and (3) | (d) Only in the circuit (1) |
The electric potential V at any point O (x, y, z all in metres) in space is given by 
. The electric field at the point (1m,0, 2m) in volt/metre is
|
(a) 8 along negative X - axis |
(b) 8 along positive X - axis |
|
(c) 16 along negative X - axis |
(d) 16 along positive Z - axis |
Ray diverging from a point source from a wave front that is
|
(a) Cylindrical |
(b) Spherical |
(c) Plane |
(d) Cubical |
If a steady current of 4 amp maintained for 40 minutes, deposits 4.5 gm of zinc at the cathode and then the electro chemical equivalent will be
|
(a) 51 |
(b) 28 |
|
(c) 32 |
(d) 47 |
Unpolarized light of intensity 32Wm–2 passes through three polarizers such that transmission axes of the first and second polarizer makes and angle 30° with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be
|
(a) 32 Wm–2 |
(b) 3 Wm–2 |
(c) 8 Wm–2 |
(d) 4 Wm–2 |
According to Bohr's theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to
|
(a) |
(b) |
(c) |
(d) |
A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 amp, then the current in the primary coil is
|
(a) 1 amp |
(b) 4 amp |
(c) 8 amp |
(d) 16 amp |
A coil of 100 turns and area 5 square centimetre is placed in a magnetic field B = 0.2 T. The normal to the plane of the coil makes an angle of 60° with the direction of the magnetic field. The magnetic flux linked with the coil is
|
(a) 5 |
(b) 5 |
(c) |
(d) |
Ohm's law is true
|
(a) For metallic conductors at low temperature |
|
(b) For metallic conductors at high temperature |
|
(c) For electrolytes when current passes through them |
|
(d) For diode when current flows |
