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In the following Wheatstone bridge P/Q = R/S. If key K is closed, then the galvanometer will show deflection
|
(a) In left side |
(b) In right side |
(c) No deflection |
(d) In either side |
A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is
|
(a) 2eV |
(b) 2J |
(c) 2kJ |
(d) 2keV |
If in nature there may not be an element for which the principal quantum number n > 4, then the total possible number of elements will be
|
(a) 60 |
(b) 32 |
(c) 4 |
(d) 64 |
Cathode rays travelling from east to west enter into region of electric field directed towards north to south in the plane of paper. The deflection of cathode rays is towards
|
(a) East |
(b) South |
(c) West |
(d) North |
A star moves away from earth at speed 0.8 c while emitting light of frequency 6 
. What frequency will be observed on the earth (in units of 1014 Hz) (c = speed of light)
|
(a) 0.24 |
(b) 1.2 |
(c) 30 |
(d) 3.3 |
The ratio of the refractive index of red light to blue light in air is
|
(a) Less than unity |
|
(b) Equal to unity |
|
(c) Greater than unity |
|
(d) Less as well as greater than unity depending upon the experimental arrangement |
A charge of magnitude 3e and mass 2m is moving in an electric field 
. The acceleration imparted to the charge is
|
(a) 2Ee/3m |
(b) 3Ee/2m |
(c) 2m/3Ee |
(d) 3m/2Ee |