Tiêu đề AIM NEET Part Test 12.pdf ✅

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[3] 18. A barometer reads 76 cm of Hg column when it is in rest kept in a stationary lift. If lift starts a moving up with decreasing speed the reading of Hg column is (1) 76 cm (2) > 76 Hg (3) < 76 H (4) Data insufficient to answer 19. A ball of mass is released from height equal to radius of earth. It hits earth surface with speed equal to (1) g Re (2) 2 Re g (3) 3 Re 2 g (4) Re 2 g 20. Select correct statement regarding streamline (1) The speed of fluid particles is constant (2) The velocity of all fluid particle are same at every point (3) The velocity of all fluid particles are same at a given position (4) Both (1) & (3) 21. If E and B represent the electric and magnetic field vectors of an electromagnetic wave, then the direction of propagation of the electromagnetic wave is in the direction of (1) E (2) B (3) E B (4) B E 22. Velocity of electromagnetic waves in a medium is (1) ( ) 1/2 0 0 −   (2) ( ) 1/2 0 0 −     r r (3) 8 3 10 m/s  (4) 1/2 0 0 +           r r 23. A fundamental particle is moving with speed equal to half of the speed of light, then the ratio of its rest and kinetic mass is equal to (1) 0.87 (2) 0.62 (3) 0.48 (4) 0.38 24. Which of the following has the largest wavelength? (1) Radio wave (2) X-ray (3) Ultraviolet ray (4) Infra-red ray 25. If in a plano-convex lens, radius of curvature of convex surface is 10 cm and the focal length of lens is 30 cm, the refractive index of the material of the lens will be (1) 1.5 (2) 1.66 (3) 1.33 (4) 3 26. A light ray is incidence on first refracting surface of a prism at angle i. If angle of prism A = 2C (where C is critical angle of prism material w.r.t. its surrounding), then for what value of i light ray comes out of prism from second refracting surface? (1) i  60° (2) i  30° (3) i = 45° (4) It will not come out for any value of i 27. In Young’s double slit experiment, waves from slit s1 and s2 are identical (= I0). At what distance on the screen from central maximum, resultant intensity is same as intensity due to only one slits? ( = fringe width) (1)  (2) 3  (3) 2 3  (4) 3 2 28. Four charges each equal to Q are placed at the four corners of a square and a charge q is placed at the centre of the square. If the system is in equilibrium then the value of q is (1) (1 2 2 ) 2 + Q (2) (1 2 2 ) 4 − + Q (3) (1 2 2 ) 4 + Q (4) (1 2 2 ) 2 − + Q 29. The peak value of an alternating e.m.f. 0 E E t = sinω is 10 volt and its frequency is 50 Hz . At a time 1 600 s t = , the instantaneous value of the e.m.f. is (1) 1 volt (2) 5 3 volt (3) 5 volt (4) 10 volt