Tiêu đề NEET - 11 - 2024.pdf ✅

ALL INDIA NEET TEST SERIES-UG-2023-24 DURATION : 200 Minutes DATE : MARKS : 720 Topic Covered PHYSICS : Gravitation, Dual Nature of Radiation and Matter CHEMISTRY : Hydrocarbons (Complete), Aromatic Hydrocarbon BIOLOGY : Human Health and Disease (Zoology), Microbes in Human Welfare (Botany)
PHYSICS SECTION - A Attempt All 35 Questions (1.) For photoelectric emission from certain metal the cut-off frequency is v . If radiation of frequency 2v incident on the metal plate, the maximum possible velocity of the emitted electron will be ( m is the electron mass) : (1) hv m (2) 2hv m (3) 2 m hv (4) (2 ) hv m (2.) When green light is incident on the surface of metal, it emits photo-electrons but there is no such emission with yellow colour light. Which one of the colour can produce emission of photoelectrons (1) Orange (2) Red (3) Indigo (4) None of these (3.) Particle of mass 'M' at rest breaks into two particles of masses 3 M and 2 3 M . Find the ratio of their de-Broglie wavelengths : (1) 1: 2 (2) 1:1 (3) 2:1 (4) 2:3 (4.) Two metals A and B have work functions 4eV and 10eV respectively. Which metal has higher threshold wave length : (1) both have smae threshold wave length (2) metal A (3) metal B (4) none of these (5.) Ultraviolet light of wavelength 280nm is used in an experiment on photoelectric effect with lithium ( = 2.5eV) cathode find the stopping potential V : (1) 1.9 V (2) −1.9 V (3) 1.6 V (4) 1.7 V . (6.) The frequency and intensity of the incident beam of light falling on the surface of a photoelectric material is increased by a factor of two. This will: (1) Increases the maximum kinetic energy of the photoelectrons by a factor of two (2) Increases the maximum kinetic energy of the photoelectrons and will increase the photoelectrons current by a factor of two
(3) Increases the maximum kinetic energy of the photoelectrons but will have no effect on photoelectric current (4) No effect on kinetic energy of the photoelectrons but will increases the photoelectrons current by a factor of two (7.) Two point sources of monochromatic light have equal powers. One gives red light and the other blue light. If R n and B n represent the number of photons emitted in a given time by red and blue sources respectively, then (1) R B n n = (2) R B n n  (3) R B n n  (4) R B n n  (8.) Which one of the following is true : a) photon is electricaly neutral b) rest mass of photon is zero (1) only a (2) only b (3) both a and b (4) none of these (9.) Planck constant has the same dimensions as (1) force  time (2) force  distance (3) force  speed (4) force  distance  time (10.) When graph is plotted between cut off potential (Vc ) and frequency light (v ) from graph slope is : (1) h (2) h / e (3) 2 h / 3 (4) 1/ h (11.) The de-Broglie  of two particle are equal : (1) their veocities will be equal (2) their masses will be equal (3) their momentum are equal (4) product of movementum and speed are equal
(12.) In three photo electric cells A, B and C the graph between photo current and anode potential is shown in figure : (1) Intensity of incident light are equal in cell A and C (2) Frequency of incident light in cell B is greater than in A (3) Both (1) and (2) (4) Intensity in A is equal to intensity in B (13.) Light of wavelength 4000Å is incident on two metals A and B A, of work function 4.2eV and B of work function 1.19eV respectively. The photoelectrons will be emitted by: (1) Metal A (2) Metal B (3) Both A and B (4) Neither metal A nor metal B (14.) Light of wavelength 5000Å falls on a photo sensitive surface. If the surface has received 2 10−  7 J energy, the number of photons falling on the surface is : (1) 11 2.5 10  (2) 11 5 10  (3) 14 2.5 10  (4) 11 7.5 10  (15.) E and v be the K.E. of photo electron and frequency of light radiation respectively. If we half the frequency of radiation then the new K.E. energy of electron is : (1) Always E h / 2 − v (2) Always E+W/2 (3) Always E/2 (4) None of these (16.) A radiation of energy ' E ' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (C = Velocity of light): (1) E C (2) 2E C (3) 2 2E C (4) 2 E C (17.) Which rays deflected more cathode ray, X -rays  -rays in magnetic field :