The symbol given in figure represents
|
(a) NPN transistor |
(b) PNP transistor |
|
(c) Forward biased PN junction diode |
(d) Reverse biased NP junction diode |
(a) NPN transistor
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In sum and difference method in vibration magnetometer, the time period is more if
| (a) Similar poles of both magnets are on same sides |
| (b) Opposite poles of both magnets are on same sides |
| (c) Both magnets are perpendicular to each other |
| (d) Nothing can be said |
In a full wave rectifiers, input ac current has a frequency ‘n’. The output frequency of current is
|
(a) n/2 |
(b) n |
(c) 2n |
(d) None of these |
X-rays were discovered by
| (a) Becquerel | (b) Roentgen | (c) Marie Curie | (d) Von Laue |
A voltmeter of resistance 1000 Ω gives full scale deflection when a current of 100 mA flow through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full scale deflection is
|
(a) 10000 Ω |
(b) 9000 Ω |
(c) 222 Ω |
(d) 111 Ω |
The capacitance of a spherical condenser is 1μF. If the spacing between the two spheres is 1mm, then the radius of the outer sphere is
|
(a) 30 cm |
(b) 6 m |
(c) 5 cm |
(d) 3 m |
In a working nuclear reactor, Cadmium rods, (control rods) are used to
|
(a) Speed up neutrons |
(b) Slow down neutrons |
|
(c) Absorb some neutrons |
(d) Absorb all neutrons |
Two capacitors of capacitances 3 μF and 6 μF are charged to a potential of 12 V each. They are now connected to each other, with the positive plate of each joined to the negative plate of the other. The potential difference across each will be
|
(a) 6 volt |
(b) 4 volt |
(c) 3 volt |
(d) Zero |