Tiêu đề NEET - 10 - 2024.pdf ✅

ALL INDIA NEET TEST SERIES-UG-2023-24 DURATION : 200 Minutes DATE : MARKS : 720 Topic Covered PHYSICS : Motion of system of particles, Rigid Body, Wave-II CHEMISTRY : Ionic Equilibrium BIOLOGY : Morphology of flowering plants and Structural organisation in Animals
PHYSICS SECTION - A Attempt All 35 Questions (1.) Equation of motion in the same direction are given by y a t kx y a t kx 1 2 = − = − − 2 sin , 2 sin (   ) ( ) . The amplitude of the medium particle will be : (1) 2 cos a  (2) 2 cos a  (3) 4 cos / 2 a  (4) 2 cos / 2 a  (2.) If two waves of same frequency and same amplitude on superposition, produce a resultant disturbance of the same amplitude, the wave differ in phase by : (1)  (2) 2 3  (3) 3  (4) 3 . (3.) In an interference experiment the ratio of amplitudes of coherent waves is 1 2 1 3 a a = . The ratio of maximum and minimum intensities of fringes will be: (1) 4 (2) 2 (3) 9 (4) 18 (4.) An open pipe is in resonance in its nd 2 harmonic with tuning fork of frequency 1 f . Now it is closed at one end. if the frequency of the tuning fork is increased slowly from 1 f then again a resonance is obtained with a frequency 2 f . If in this case the pipe vibrates th n harmonics then: (1) 2 1 3 3, 4 n f f = = (2) 2 1 5 3, 4 n f f = = (3) 2 1 5 5, 4 n f f = = (4) 2 1 3 n 5,f f 4 = = (5.) At node in stationary waves : (1) Change in pressure and density are maximum (2) Change in pressure and density are minimum (3) Strain is zero (4) Energy is maximum. (6.) Stationary waves : (1) Transport energy (2) Does not transport energy (3) Have nodes and antinodes
(4) Both (2) and (3) (7.) 16 tunning forks are arranged in the order of increasing frequencies. Any two successive forks give 8 beats per sec when sounded together. If the frequency of the last fork is twice the first, then the frequency of the first fork is: (1) 120 (2) 160 (3) 180 (4) 220 (8.) Two vibrating tuning forks produce progressive waves given by 1Y t = 4sin500 and 2 Y t = 2sin506 . Number of beats produced per minute is : (1) 360 (2) 180 (3) 3 (4) 60 (9.) An organ pipe is closed at one end has fundamental frequency of 1500 Hz . The maximum number of overtone generated by this pipe which a normal person can hear is: (1) 14 (2) 13 (3) 6 (4) 9 (10.) Two tuning forks when sounded together produced 4 beats/sec. The frequency of one fork is 256 . The number of beats heard increases when the fork of frequency 256 is loaded with wax. The frequency of the other fork is: (1) 504 (2) 520 (3) 260 (4) 252 (11.) "Stationary waves" are so called because in them: (1) The particles of the medium are not distrubed at all (2) The particles of the medium do not execute SHM (3) There occurs no flow of energy along the wave (4) The interference effect can't be observed. (12.) In stationary wave all particles between two nodes pass through the mean position : (1) At different times with different velocities (2) At different times with the same velocity (3) At the same time with equal velocity (4) At the same time with different velocities (13.) Two simple harmonic motions are represented by equations y t y t 1 2 = +  = 4sin 10 5cos10 (  ) What is the phase difference between their velocities? (1)  (2) −
(3) 2       +   (4) 2       −   (14.) A stretched string of 1 m length fixed at both ends, having a mass of 4 5 10 kg −  is under a tension of 20 N . It is plucked at a point situated at 25 cm from one end. The stretched string would vibrate with a frequency of : (1) 400 Hz (2) 100 Hz (3) 200 Hz (4) 256 Hz . (15.) A closed organ pipe and an open organ pipe have their first overtones identical in frequency. Their lengths are in the ratio : (1) 1: 2 (2) 2:3 (3) 3: 4 (4) 4:5 . (16.) A tuning fork P of frequency 256 Hz produces 4 beats with another tuning fork Q . When a small amount of wax is attached to Q , the number of beats heard per second is 2 . The original frequency of the fork Q is : (1) 258 Hz (2) 262 Hz (3) 260 Hz (4) 256 Hz . (17.) The frequency of a fork is 200 Hz . The distance through which sound travels by the time the fork makes 16 vibrations is (velocity of sound in air is 1 340 ms− ): (1) 34 m (2) 21.25 m (3) 425 m (4) 27.2 m . (18.) Two closed-end pipes, when sounded together produce 5 beats per second. If their lengths are in the ratio 100:101 , then fundamental nodes (in Hz) produced by them are : (1) 245,250 (2) 250,255 (3) 495,500 (4) 500,505 . (19.) A string in divided into three segments, so that the segments possess fundamental frequencies in the ratio 1: 2:3 . Then, the length of the segments are in the ratio : (1) 6:3: 2 (2) 4:3: 2 (3) 4: 2:1 (4) 3: 2:1. (20.) The equation of a stationary wave is : 4sin cos 96 ( ) 15 x y t     =     . The distance between a node and its next antinode is : (1) 7.5 units (2) 1.5 units (3) 22.5 units (4) 30 units.