- AStore electrical energy.
- BBuild up high voltage of few million volts.
- CDecelerate charged particle like electrons.
- DBoth (a) and (b).
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Which logic gate is represented by following diagram
|
(a) AND |
(b) OR |
(c) NOR |
(d) XOR |
A galvanometer of resistance 25 Ω gives full scale deflection for a current of 10 milliampere, is to be changed into a voltmeter of range 100 V by connecting a resistance of ‘R’ in series with galvanometer. The value of resistance R in Ω is
|
(a) 10000 |
(b) 10025 |
(c) 975 |
(d) 9975 |
A step-up transformer operates on a 230 V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1 : 25. The current in the primary is
|
(a) 15 A |
(b) 50 A |
(c) 25 A |
(d) 12.5 A |
Approximate height of ozone layer above the ground is
|
(a) 60 to 70 km |
(b) 59 km to 80 km |
(c) 70 km to 100 km |
(d) 100 km to 200 km |
In a transformer 220 ac voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary will be
|
(a) 200 |
(b) 100 |
(c) 50 |
(d) 20 |
A plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
|
(a) 50 cm |
(b) 100 cm |
(c) 200 cm |
(d) 400 cm |
In an NPN transistor the collector current is 24 mA. If 80% of electrons reach collector its base current in mA is
|
(a) 36 |
(b) 26 |
(c) 16 |
(d) 6 |
A point object O is placed on the principal axis of a convex lens of focal length f = 20cm at a distance of 40cm to the left of it. The diameter of the lens is 10cm. An eye is placed 60cm to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is: