A coil and a bulb are connected in series with a dc source, a soft iron core is then inserted in the coil. Then
|
(a) Intensity of the bulb remains the same |
(b) Intensity of the bulb decreases |
|
(c) Intensity of the bulb increases |
(d) The bulb ceases to glow |
(b) Intensity of the bulb decreases
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P-type semiconductor is formed when
A. As impurity is mixed in Si B. Al impurity is mixed in Si
C. B impurity is mixed in Ge D. P impurity is mixed in Ge
|
(a) A and C |
(b) A and D |
(c) B and C |
(d) B and D |
If a coil made of conducting wires is rotated between poles pieces of the permanent magnet. The motion will generate a current and this device is called
|
(a) An electric motor |
(b) An electric generator |
|
(c) An electromagnet |
(d) All of above |
What is the net force on a Cl– placed at the centre of the bcc structure of CsCl
|
(a) Zero |
(b) |
(c) |
(d) Data is incomplete |
The potential gradient along the length of a uniform wire is 10 volt/metre. B and C are the two points at 30 cm and 60 cm point on a meter scale fitted along the wire. The potential difference between B and C will be
|
(a) 3 volt |
(b) 0.4 volt |
(c) 7 volt |
(d) 4 volt |
Total internal reflection of light is possible when light enters from
|
(a) Air to glass |
(b) Vacuum to air |
(c) Air to water |
(d) Water to air |
A lens (focal length 50 cm) forms the image of a distant object which subtends an angle of 1 milliradian at the lens. What is the size of the image
|
(a) 5 mm |
(b) 1 mm |
(c) 0.5 mm |
(d) 0.1 mm |
The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV
|
(a) 28 |
(b) 7 |
(c) 4 |
(d) 1 |
For a photoelectric cell the graph showing the variation of cut of voltage (Vo) with frequency (n) of incident light is best represented by
|
(a)
|
(b)
|
(c)
|
(d)
|
