When a current passes through the junction of two different metals, evolution or absorption of heat at the junction is known as
|
(a) Joule effect |
(b) Seebeck effect |
(c) Peltier effect |
(d) Thomson effect |
(c) Peltier effect
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Relative permeability of iron is 5500, then its magnetic susceptibility will be
|
(a) 5500 × 107 |
(b) 5500 × 10–7 |
(c) 5501 |
(d) 5499 |
Magnetic meridian is a
|
(a) Point |
(b) Horizontal plane |
(c) Vertical plane |
(d) Line along N-S |
A dip needle lies initially in the magnetic meridian when it shows an angle of dip q at a place. The dip circle is rotated through an angle x in the horizontal plane and then it shows an angle of dip 
. Then 
is
|
(a) |
(b) |
(c) |
(d) cos x |
An electron (mass = 9.1 
kg; charge = 1.6 
C) experiences no deflection if subjected to an electric field of 3.2 
V/m, and a magnetic fields of 2.0 
Wb/m2. Both the fields are normal to the path of electron and to each other. If the electric field is removed, then the electron will revolve in an orbit of radius
|
(a) 45 m |
(b) 4.5 m |
(c) 0.45 m |
(d) 0.045 m |
Nucleus of an atom whose atomic mass is 24 consists of
|
(a) 11 electrons, 11 protons and 13 neutrons |
(b) 11 electrons, 13 protons and 11 neutrons |
|
(c) 11 protons and 13 neutrons |
(d) 11 protons and 13 electrons |
In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best
|
(a) Slow proton |
(b) Fast neutron |
(c) Slow neutron |
(d) None of these |
