- ASouth-west
- BEast-west
- CNorth-south
- DNorth-west
Explanation:
A freely suspended magnet aligns in north-south direction.
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A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after 5 years will be
|
(a) |
(b) |
(c) |
(d) |
In a P-type semiconductor, germanium is doped with
|
(a) Boron |
(b) Gallium |
(c) Aluminium |
(d) All of these |
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 |
A semiconductor X is made by doping a germanium crystal with arsenic (Z = 33). A second semiconductor Y is made by doping germanium with indium (Z = 49). The two are joined end to end and connected to a battery as shown. Which of the following statements is correct
|
(a) X is P-type, Y is N-type and the junction is forward biased |
|
(b) X is N-type, Y is P-type and the junction is forward biased |
|
(c) X is P-type, Y is N-type and the junction is reverse biased |
|
(d) X is N-type, Y is P-type and the junction is reverse biased |
Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field their path will be
|
(a) Straight line |
(b) Circle |
(c) Parabolic |
(d) Ellipse |
When a ray of light passes from a denser to a rarer medium, some part of it gets ....... into the denser medium: