- AA ferromagnetic material becomes paramagenetic.
- BA paramagnetic material becomes diamagnetic.
- CA ferromagnetic material becomes diamagnetic.
- DA paramagnetic meterial becomes ferromagnetic.
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Velocity of light in glass whose refractive index with respect to air is 1.5 is 2 × 108 m/s and in certain liquid the velocity of light found to be 2.5 × 108 m/s. The refractive index of the liquid with respect to air is
|
(a) 0.64 |
(b) 0.80 |
(c) 1.20 |
(d) 1.44 |
An element A decays into element C by a two step process :
A → B +
B → C +
Then
|
(a) A and C are isotopes |
(b) A and C are isobars |
|
(c) A and B are isotopes |
(d) A and B are isobars |
We can reduce eddy currents in the core of transformer
|
(a) By increasing the number of turns in secondary coil |
|
(b) By taking laminated core |
|
(c) By making step-down transformer |
|
(d) By using a weak ac at high potential |
You are given several identical resistances each of value R = 10 Ω and each capable of carrying maximum current of 1 ampere. It is required to make a suitable combination of these resistances to produce a resistance of 5 Ω which can carry a current of 4 amperes. The minimum number of resistances of the type R that will be required for this job
|
(a) 4 |
(b) 10 |
(c) 8 |
(d) 20 |
In the given circuit, the voltmeter records 5 volts. The resistance of the voltmeter in ohms is

|
(a) 200 |
(b) 100 |
(c) 10 |
(d) 50 |
A diode is connected to 220 V (rms) ac in series with a capacitor as shown in figure. The voltage across the capacitor is

|
(a) 220 V |
(b) 110 V |
(c) 311.1 V |
(d) |
Electric room radiator which operates at 225 volts has resistance of 50 ohms. Power of the radiator is approximately
|
(a) 100 W |
(b) 450 W |
(c) 750 W |
(d) 1000 W |