Explanation:
The statement magnetic intensity and intensity of magnetization are the same is the false one. They are not the same. When a magnet is entering a magnetic field, then the poles of the magnet experiences certain forces. Magnetic intensity refers to the measure of these forces. But, the intensity of magnetization explains the change in the magnetic moment of a magnet as a function of volume. All the other statements are valid.
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The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 (Fig). Which of the four rays correctly shows the direction of reflected ray?
What happens to the fringe pattern when the Young’s double slit experiment is performed in water instead or air then fringe width
|
(a) Shrinks |
(b) Disappear |
(c) Unchanged |
(d) Enlarged |
An infinite number of charges, each of charge 1 mC, are placed on the x-axis with co-ordinates x = 1, 2, 4, 8, ....¥. If a charge of 1 C is kept at the origin, then what is the net force acting on 1 C charge
|
(a) 9000 N |
(b) 12000 N |
(c) 24000 N |
(d) 36000 N |
A radioactive sample is a-emitter with half life 138.6 days is observed by a student to have 2000 disintegration/sec. The number of radioactive nuclei for given activity are
|
(a) 3.45 × 1010 |
(b) 1 × 1010 |
(c) 3.45 × 1015 |
(d) 2.75 × 1011 |
Isogonic lines on magnetic map will have
|
(a) Zero angle of dip |
(b) Zero angle of declination |
|
(c) Same angle of declination |
(d) Same angle of dip |
The first excited state of hydrogen atom is 10.2 eV above its ground state. The temperature is needed to excite hydrogen atoms to first excited level, is
(a) 7.9 
|
(b) 3.5
|
(c) 5.8
|
(d) 14
|