Angular width (b) of central maximum of a diffraction pattern on a single slit does not depend upon
|
(a) Distance between slit and source |
(b) Wavelength of light used |
|
(c) Width of the slit |
(d) Frequency of light used |
(a) Distance between slit and source
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When a proton is accelerated with 1 volt potential difference, then its kinetic energy is
|
(a) |
(b) 1840 eV |
(c) 1 eV |
(d) 1840 c2 eV |
The work done in turning a magnet of magnetic moment 'M' by an angle of 90° from the meridian is 'n' times the corresponding work done to turn it through an angle of 60°, where 'n' is given by
|
(a) 1/2 |
(b) 2 |
(c) 1/4 |
(d) 1 |
In a transformer, the number of turns in primary and secondary are 500 and 2000 respectively. If current in primary is 48 A, the current in the secondary is
|
(a) 12 A |
(b) 24 A |
(c) 48 A |
(d) 144 A |
When light of wavelength λ is incident on an equilateral prism kept in its minimum deviation position, it is found that the angle of deviation equals the angle of the prism itself. The refractive index of the material of the prism for the wavelength λ is, then
|
(a) |
(b) |
(c) 2 |
(d) |
There is a uniform electric field of strength 
along y-axis. A body of mass 1g and charge 
is projected into the field from origin along the positive x-axis with a velocity 10m/s. Its speed in m/s after 10s is (Neglect gravitation)
|
(a) 10 |
(b) 5 |
(c) 10 |
(d) 20 |
Order of q/m ratio of proton, α -particle and electron is
|
(a) e > p > α |
(b) p > α > e |
(c) e > α > p |
(d) None of these |
A prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror
|
(a) 176o |
(b) 4o |
(c) 178o |
(d) 2o |
At room temperature, copper has free electron density of 8.4 
per 
. The copper conductor has a cross-section of 10–6 m2 and carries a current of 5.4 A. The electron drift velocity in copper is
|
(a) 400 m/s |
(b) 0.4 m/s |
(c) 0.4 mm/s |
(d) 72 m/s |
