The phenomenon of interference is shown by
|
(a) Longitudinal mechanical waves only |
(b) Transverse mechanical waves only |
|
(c) Electromagnetic waves only |
(d) All the above types of waves |
(d) All the above types of waves
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In the position of minimum deviation when a ray of yellow light passes through the prism, then its angle of incidence is
|
(a) Less than the emergent angle |
|
(b) Greater than the emergent angle |
|
(c) Sum of angle of incidence and emergent angle is 90° |
|
(d) Equal to the emergent angle |
The order of the size of nucleus and Bohr radius of an atom respectively are
|
(a) |
(b) |
(c) |
(d) |
A one metre long wire is lying at right angles to the magnetic field. A force of 1 kg wt. is acting on it in a magnetic field of 0.98 Tesla. The current flowing in it will be
|
(a) 100 A |
(b) 10 A |
(c) 1 A |
(d) Zero |
One requires energy 
to remove a nucleon from a nucleus and an energy ‘
to remove an electron from the orbit of an atom. Then
|
(a) |
(b) |
(c) |
(d) |
Two lenses of power +12 and – 2 diopters are placed in contact. What will the focal length of combination
|
(a) 10 cm |
(b) 12.5 cm |
(c) 16.6 cm |
(d) 8.33 cm |
An electric wire is connected across a cell of e.m.f. E. The current I is measured by an ammeter of resistance R. According to ohm's law
|
(a) |
(b) E = IR |
(c) E = R/I |
(d) E = I/R |
