In a diffraction pattern by a wire, on increasing diameter of wire, fringe width
|
(a) Decreases |
|
(b) Increases |
|
(c) Remains unchanged |
|
(d) Increasing or decreasing will depend on wavelength |
(a) Decreases
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An a particle is accelerated through a p.d of 
volt then K.E. of particle will be
|
(a) 8 MeV |
(b) 4 MeV |
(c) 2 MeV |
(d) 1 MeV |
By a cell a current of 0.9 A flows through 2 ohm resistor and 0.3 A through 7 ohm resistor. The internal resistance of the cell is
|
(a) 0.5 Ω |
(b) 1.0 Ω |
(c) 1.2 Ω |
(d) 2.0 Ω |
Coherent sources are those sources for which
|
(a) Phase difference remain constant |
|
(b) Frequency remains constant |
|
(c) Both phase difference and frequency remains constant |
|
(d) None of these |
The electric potential at a point on the axis of an electric dipole depends on the distance r of the point from the dipole as
|
(a) ∝ |
(b) ∝ |
(c) ∝ r |
(d) ∝ |
A lens of power +2 diopters is placed in contact with a lens of power – 1 diopter. The combination will behave like
|
(a) A convergent lens of focal length 50 cm |
|
(b) A divergent lens of focal length 100 cm |
|
(c) A convergent lens of focal length 100 cm |
|
(d) A convergent lens of focal length 200 cm |
According to Mosley's law, the frequency of a spectral line in X-ray spectrum varies as
|
(a) Atomic number of the element |
| (b) Square of the atomic number of the element |
| (c) Square root of the atomic number of the element |
|
(d) Fourth power of the atomic number of the element |
