Title AITS 09 MORNING SHIFT.pdf ✅

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SPACE FOR ROUGH WORK [2] SECTION-I (PHYSICS) SECTION - A 1. Choose the correct statement for the given i (photoelectric current) and V (accelerating potential difference) graph, where λ1 and λ2 are wavelengths of incident light (1) λ1 > λ2 (2) λ1 < λ2 (3) λ1 = λ2 (4) λ1 = 2λ2 2. In photoelectric effect experiment, the graph between stopping potential and frequency for three different metals X, Y and Z given below, the metal of maximum work function is (1) X (2) Y (3) Z (4) All of these 3. The threshold frequency for a photosensitive metal is 3.3 × 1014 Hz. If light of frequency 8.2 × 1014 Hz is incident on this metal, the cut-off voltage for the photoelectric emission is nearly (1) 5 V (2) 1 V (3) 2 V (4) 3 V 4. The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement? (1) Curves (a) and (b) represent incident radiations of same frequency but of different intensity. (2) Curves (b) and (c) represent incident radiations of different frequencies but of different intensity. (3) Curves (b) and (c) represent incident radiations of same frequency having same intensity. (4) Curves (a) and (b) represent incident radiations of different frequencies and different intensities. 5. Two coherent light waves are represented by y1 = 8 sin ωt and y2 = 6 sin (ωt + 60°). If these two waves interfere at a point, the amplitude of resultant wave will be nearly [t is in second] (1) 16 (2) 20 (3) 12 (4) 10 6. In adjoining figure, if PQ is incident wavefront and RS is refracted wavefront, (PR is interface of two mediums) then sin sin is (1) 1 (2) 3/2 (3) 2/3 (4) 1/2
SPACE FOR ROUGH WORK [3] 7. In a double slit experiment, the distance between the slits is d. The screen is at a distance D from the slits. If bright fringe is formed opposite to one of the slits then its order is (1) d (2) 2 2 d D (3) 2 2 D d (4) 2 dD 8. In the Young’s double-slit experiment, the intensity of light at a point on the screen where the path difference is λ is K, (λ being the wave length of light used). The intensity at a point where the path difference is λ/4, will be: (1) K (2) 4 K (3) 2 K (4) Zero 9. Two point sources separated by 2.0 m are radiating in phase with λ = 0.50 m. A detector moves in a circular path around two sources in a plane containing them. How many maxima are detected? (1) 16 (2) 20 (3) 24 (4) 32 10. Two coherent light sources, each of wavelength λ, are separated by a distance 3λ. The maximum number of minima formed on line AB, which runs from –∞ to +∞ is (1) 2 (2) 4 (3) 6 (4) 8 11. Refractive index of material is equal to the tangent of polarising angle. It is called (1) Brewster’s law (2) Lambert’s law (3) Malus’ law (4) Bragg’s law 12. Brewster angle for air to water transition is (refractive index of water is 4 3 ) (1) 1 3 sin 4 (2) 1 3 cos 4 (3) 1 3 tan 4 (4) 1 3 cot 4