In a PN-junction
|
(a) P and N both are at same potential |
|
(b) High potential at N side and low potential at P side |
|
(c) High potential at P side and low potential at N side |
|
(d) Low potential at N side and zero potential at P side |
(b) High potential at N side and low potential at P side
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In a parallel beam of white light is incident on a converging lens, the colour which is brought to focus nearest to the lens is
|
(a) Violet |
(b) Red |
|
(c) The mean colour |
(d) All the colours together |
Assertion : A person touching a high power line gets stuck with the line.
Reason : The current carrying wires attract the man towards it.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into a voltmeter of range nV volts is
|
(a) nG |
(b) (n – 1)G |
(c) |
(d) |
A circular loop of area 
carrying a current of 10 A, is held perpendicular to a magnetic field of intensity 0.1T. The torque acting on the loop is
|
(a) Zero |
(b) 0.01 N-m |
(c) 0.001 N-m |
(d) 0.8 N-m |
The half life of polonium is 140 days. After how many days, 16 gm polonium will be reduced to 1 gm (or 15g will decay)
|
(a) 700 days |
(b) 280 days |
(c) 560 days |
(d) 420 days |
