In Young's double slit experiment, a glass plate is placed before a slit which absorbs half the intensity of light. Under this case
|
(a) The brightness of fringes decreases |
|
(b) The fringe width decreases |
|
(c) No fringes will be observed |
|
(d) The bright fringes become fainter and the dark fringes have finite light intensity |
(d) The bright fringes become fainter and the dark fringes have finite light intensity
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$\frac{\text{E}}{2}$
$2\text{E}$
$\text{E}$
$\frac{\text{E}}{4}$
Half life of a radioactive substance is T. The time taken for all the nuclei to disintegrate will be
|
(a) 2T |
(b) T2 |
(c) 4T |
(d) Uncertain |
The intensity of the electric field required to keep a water drop of radius 
just suspended in air when charged with one electron is approximately (g = 10 newton/kg e = 1.6 
|
(a) 260 volt/cm |
(b) 260 newton/coulomb |
|
(c) 130 volt/cm |
(d) 130 newton/coulomb |
Two resistances 
and 
when connected in series and parallel with 120 V line, power consumed will be 25 W and 100 W respectively. Then the ratio of power consumed by to that consumed by will be
|
(a) 1 : 1 |
(b) 1 : 2 |
(c) 2 : 1 |
(d) 1 : 4 |
An α particle and a proton travel with same velocity in a magnetic field perpendicular to the direction of their velocities, find the ratio of the radii of their circular path
|
(a) 4 : 1 |
(b) 1 : 4 |
(c) 2 : 1 |
(d) 1 : 2 |
What will be the resultant magnetic field at origin due to four infinite length wires. If each wire produces magnetic field 'B' at origin
|
(a) 4 B |
(b) |
(c) 2 |
(d) Zero |
The binding energies per nucleon for a deuteron and an α- particle are x1 and x2 respectively. What will be the energy Q released in the reaction 
|
(a) 4 |
(b) 4 |
(c) 2( |
(d) 2 |
