In a wave, the path difference corresponding to a phase difference of f is
|
(a) |
(b) |
(c) |
(d) |
In a wave, the path difference corresponding to a phase difference of f is
|
(a) |
(b) |
(c) |
(d) |
(c)
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Armature current in dc motor will be maximum when
|
(a) Motor has acquired maximum speed |
(b) Motor has acquired intermediate speed |
|
(c) Motor has just started moving |
(d) Motor is switched off |
For a crystal system, a = b = c, a = b = g ¹ 90o, the system is
|
(a) Tetragonal system |
(b) Cubic system |
|
(c) Orthorhombic system |
(d) Rhombohedral system |
If the wavelength of light is 4000 Å, then the number of waves in 1 mm length will be
|
(a) 25 |
(b) 0.25 |
(c) 0.25 |
(d) 25 |
A lens of power + 2 diopters is placed in contact with a lens of power – 1 diopoter. The combination will behave like
|
(a) A divergent lens of focal length 50 cm |
|
(b) A convergent lens of focal length 50 cm |
|
(c) A convergent lens of focal length 100 cm |
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(d) A divergent lens of focal length 100 cm |
A thin lens is made with a material having refractive index $\mu=1.5.$ Both the sides are convex. It is dipped in water $(\mu=1.33).$ It will behave like:
The distance between charges 5 × and -2.7
is 0.2 m. The distance at which a third charge should be placed in order that it will not experience any force along the line joining the two charges is
|
(a) 0.44 m |
(b) 0.65 m |
(c) 0.556 m |
(d) 0.350 m |
The activity of a radioactive sample
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(a) Can be increased by heating it |
(b) Is independent of physical parameter |
|
(c) Cannot be increased by any method |
(d) Both (b) and (c) |