- AS1 is true but S2 is false.
- BBoth S1 and S2 are false.
- CS1 is true, S2 is also true and S1 is the cause of S2.
- DS1 is true, S2 is also true, but the statements are independant.
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In a Young’s double slit experiment, the slit separation is 1 mm and the screen is 1 m from the slit. For a monochromatic light of wavelength 500 nm, the distance of 3rd minima from the central maxima is
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(a) 0.50 mm |
(b) 1.25 mm |
(c) 1.50 mm |
(d) 1.75 mm |
Two identical cells send the same current in 2Ω resistance, whether connected in series or in parallel. The internal resistance of the cell should be
|
(a) 1 Ω |
(b) 2 Ω |
(c) |
(d) 2.5 Ω |
If the refractive indices of a prism for red, yellow and violet colours be 1.61, 1.63 and 1.65 respectively, then the dispersive power of the prism will be
|
(a) |
(b) |
(c) |
(d) |
A double slit experiment is performed with light of wavelength 500 nm. A thin film of thickness 2 mm and refractive index 1.5 is introduced in the path of the upper beam. The location of the central maximum will
|
(a) Remain unshifted |
|
(b) Shift downward by nearly two fringes |
|
(c) Shift upward by nearly two fringes |
|
(d) Shift downward by 10 fringes |
Assertion : Kinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon.
Reason : The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The magnetic induction in air at a distance d from an isolated point pole of strength m unit will be
|
(a) |
(b) |
(c) md |
(d) |
In Young’s double slit experiment the wavelength of light was changed from 7000 Å to 3500 Å. While doubling the separation between the slits which of the following is not true for this experiment
|
(a) The width of the fringes changes |
|
(b) The colour of bright fringes changes |
|
(c) The separation between successive bright fringes changes |
|
(d) The separation between successive dark fringes remains unchanged |
The 6563 Å line emitted by hydrogen atom in a star is found to be red shifted by 5 Å. The speed with which the star is receding from the earth is
|
(a) 17.29 × 109 m/s |
(b) 4.29 × 107 m/s |
(c) 3.39 × 105 m/s |
(d) 2.29 × 105 m/s |
If potential V = 100 ± 0.5 Volt and current I = 10 ± 0.2 amp are given to us. Then what will be the value of resistance
|
(a) 10 ± 0.7 ohm |
(b) 5 ± 2 ohm |
(c) 0.1 ± 0.2 ohm |
(d) None of these |