Physics Questions

A particle executing simple harmonic oscillation has an amplitude 14cm and time period 1 6sec Calculate the time taken by the particle to travel a distance 7 5cm away from the mean position Ans 0 161 sec

combination is in column II are arranged parallel to each other as shown in column I and the number Column II Column I 1 1 LETJ B wwwwwwwm 30 2a 2x 30 p 2 q 3 r 4 s

Two billiard balls of same size and mass are in contact on a table A third billiard ball of same size a mass strikes them symmetrically and come to rest after impact Coefficient of restitution betweent balls is 1 2 mc 2 3 3 4

101 In the figure shown a small object is released from the position A on a smooth track When the object reaches at B then normal reaction on it by the track is 3h 1 mg 3 2mg and Cylindrical surface 2 4 2mg 3 mag h

A uniform disc of radius 20 cm is performing 20 pure rolling on a moving surface if it s angular velocity is 5 rad s then find velocity of it s centre of mass 1 1 m s 3 3 m s V 2 m s 2 2 m s 4 None of these ER TEST SERIES JOINT PACKAGE COURSE 1 1 m s 3 3 m s 20 cm from the citea 35 rad saat 3 C V 2 m s 2 2 m s 4 0999DMD31032000

1 3 3 1 2 A cylindrical space of radius R is filled with a uniform magnetic induction B parallel to the axes of the cylinder If B changes at a constant rate the graph showing the variation of induced electric field with distance r from the axis of cylinder is X Et n Et xx x t 20 4 Xx 2 E Et 58 A small circular loop of radius r is placed inside a circular loon of radius R Rad The 4 An anticlockwise induced curren the closed loop Figure below shows a square loop of resistance 10 2 The magnetic field H 8 1 0 T The work done in pulling the field slowly and uniformly in 2 s X x x X t x X x x x X X x x X X x x x TY 1 3 125 x 10 3 J 2 6 25 x 104 J 3 1 25 x 10 J 4 5 0 x 10 J 61 The wires P Q and P Q rails with the same speec towards left and P Q mov electric current in the 19 X H X PX P x x X X

A horizontal overhead powerline is at a height of 4m from the ground and carries a current of 100A from east to west The magnetic field directly below it on the ground is Mo 4 x 10 7 TmA 1 5 x 10 6 T northward 2 5 x 10 6 T southward 3 2 5 x 10 7 T northward 0 25 x 10 7 T southward

83 Magnetic field at the centre at nucleus of the hydrogen like atoms atomic number Z due to the motion of electron in nth orbit is proportional to 1 n Z5 2 n 4 Z 3 Z 3 n 4 Z 5 n

18 A sonometer wire is emitting a note of frequency n when stretched by 1 point a weight If the weight is completely immersed in water then the frequency of the wire a will be zero b will not change c will decrease d will increase

32 4 1 g 2 g 2 3 g 3 4 g 4 If acceleration of the system is 2 m sec then 32 value of T is T T Ikg lkg 1kg 3 3 N 1 IN 2 2 N The 4 4 N 1 g 3 g 3 4 g 4 af farv 2m sec T B BM 1kg 2 g 2 H T 1 IN 2 2N Ikg 3 3 N 1kg 4 4 N

17 A sonometer wire of length 1 metre Vibrates in 4 loops The distance between two consecutive nodes is O a 10 cm Ob 25 cm O c 50 cm O d 60 cm

3 E m To keep the mass from accelerating a spring is attached What is the minimum spring constant of the spring to keep th block from sliding if it extends x 0 12 m from its unstretched length N m Submit

When a piece of non metal and a metal are dropped from the same height near the surface of the earth the non metallic piece will reach the ground first Induced current in metal will decrease the acceleration 7 electric fi R Direction variable aw A If the varies will

A compound microscope has a magnification of 30 when final image is formed at 25 cm from the eye piece What is magnification produced by the objective if the focal length of eyepiece is 5 cm 5 0 O 7 2 10 0 2 5

the work done by gravity when mass m is displaced slowly by a force F 0 60 from position A to position B 1 mgl 2 3 mal VG m B 0 F A 2 F mgl 2 3

A material has normal density p and bulk modulus K The increase in the density of the material when it is subjected to an external pressure P from all sides is Question Type Single Correct Type 1 P PK 2 K PP 3 pP K ok D

the velocity of the sound wave Ans 120 96m sec The velocity of a particle executing simple harmonic oscillation is 1 4m sec and 0 8m sec when it is 22cm and 48cm away from the mean position Find its time period and amplitude Ans 2 331sec 56 44cm Calculate the fraction of kinetic energy and potential energy to the total energy when the tin

19 1 25 m 2 45 m A stone is dropped from the top of a tower If it travels 34 3 m in the last second before it reaches the ground find the height of the tower g 9 8 m s 1 39 2 m 2 58 8 m 3 78 4 m 4 98 m ath second What is the fall of height in the next second

30 Equations of two progressive waves at a certain point in a medium are given by y a sin wt 1 and y2 asin wt 2 If amplitude and time period of resultant wave formed by the superposition of these two waves is same as that of both the waves then 01 02 is T a c 3R6 b d 2 3 TC

Assertion The specific charge for positive rays is a characteristic constant Reason The specific charge depends on charge and mass of positive ions present in positive rays 1 If both the assertion and the reason are true and the reason is a correct explanation of the assertion 2 If both the assertion and reason are true but the reason is not a correct explanation of the assertion 3 If the assertion is true but the reason is false 4 If both the assertion and reason are false

In the given set up the parallel plate capacitor AB has vertical plates with plate separation 50 mm and capacitance C From the plate A a small conducting ball of mass m capacitance C hangs from a non conducting silk thread of length 100 mm The ball initially touches the plate A which is connected to a power supply of voltage V for a short time by closing the switch 5 and then opening it again The plate B is grounded The motion of conducting ball is now observed It is observed that due to the charge deposited on plates and ball the ball swings across touches the plate B returns touches A and finally swings out again such that it almost touches plate B Taking g 10 ms and based on the above facts answer the following questions B 7 The angle made by ball and string with the plate A when the ball is in its final position is A 30 C 60 8 The ball initially touches plate B it loses its charge to B swings back and touches A and then finally again swings out and almost touches plate B The new common potential V is given by B A 4 CV C C B 45 D 0 C V my Covo C C

5 Blocks A and B are initially in equilibrium The springs and strings are ideal The accelerations of the blocks A and B just after the spring 2 is cut are respectively 1 g 0 al Answor 3 2 g g 2 Spring 1 2m B eeeeee Spring 2 Am 3 g g 4 0 g

16 Tension in the lower string is 20 N If natural length of spring is 10 cm then the length of the spring which is connected between 2 kg and 4 kg block as shown in figure is 201 1 9 cm Sol Answer 3 2 10 cm m 2 kg K 60 N cm m 4 kg T 20 N 3 11 cm 4 12 cm

A source of frequency f gives 5 beats sec when sounded with a source of frequency 200 Hz The second harmonic of source of frequency f gives 10 beats sec when sounded with a source of frequency 420 Hz The value of fis 195 Hz 410 Hz 205 Hz 390 Hz

A non conducting ring having a uniformly distributed negative charge is placed in the plane of smooth paper A uniformly decreasing inward magnetic field is passing through the ring Then 1 Ring will start rotating anticlockwise 2 Ring will start rotating clockwise 3 Ring will jump and becomes floating above the paper 4 No change will be observed in the position of the ring

3 Resistances A and B are connected respectively in the left gap and right 1 point gap of a metre bridge If the balance point is located at 55 cm from the right the ratio A B is a 4 5 b 5 4 c 9 11 d 11 9

28 particle moves along x axis in positive direction Its acceleration a given as a cx d where x denotes the x coordinate of particle c and d are positive constants For velocity position graph of particle to be of type as shown in figure the value of speed of particle at x 0 should be 1 4d C 2 C 3 2d C P 8d C

The refractive indices of a thin prism for red violet and yellow lights are 1 52 1 62 and 1 59 respectively If mean deviation is 4 what is angular dispersion produced by prism 0 68 4 52 2 80 0 98

The angle between two vectors given by 61 63 3k and 7i j 4k is B D C COS 4 cal Correct option is D sin We know angle between two vectors is given by A B cos 8 A A B A 62 62 3 9 B 72 4 4 9 And A B 61 61 3k 7i 4j 4k 42 24 12 54 Now putting the above values in A we get 8 cos 0 sin 0 sin Tage 54 81 1 3 When we are multiplying 6i 6j 7i 4j 4k We do like this 6x7 6x4 j 3x4 k 42 24 12 because i 2 j k And not like the way we generally d multiplication in maths when we ar variables like this 61 71 4 4k 6 71 4 4k 3k 7i 4j 4k Can you please explain why it is so

Han 8 1 37 A detector is released from rest over a source of sound of frequency fo 10 Hz The frequency observed by the detector at time t is plotted in the graph The speed of sound in air is g 10 m s ONS a 330 m s c 300 m s f Hz 2000 1000 30 t s b 350 m s d 310 m s

The slits are 1 mm apart from each other and illuminated with a light of wavelength 5 x 10 7 m If the distance of screen from slits plane is 1 m then distance of third dark fringe from central maxima will be 1 25 mm 2 50 mm 3 75 mm 0 75 mm

0 The string of a sonometer is divided into two parts using wedge Total length of string is 1m and two parts differ by 2mm When sounded together they produce 2 beats sec The freqencies of two parts are 1 501Hz 503Hz 2 501Hz 499Hz 3 499Hz 497Hz 4 497Hz 495Hz 3

29 A conveyor belt moves to the right with speed v 300 m min A pieman puts pies on the belt at a rate of 20 per minute while walking with speed 30 m min towards a receiver at the other end The frequency with which they are received by the stationary receiver is a hovud a 26 67 min c 22 22 min b 30 min d 24 min

Light waves from two coherent sources of intensity ratio 81 1 produce interference What is the ratio of maximum and minimum intensity in interference pattern 56 25 16 36 25

particle moving along x axis has acceleration f at time t given by f fo 1 where fo and T are constants The particle at t 0 has zero velocity In the time interval between t 0 and the instant when f 0 the particle s velocity v is b for d f T a c 1 for IN in for 2007

A boy is standing on a weighing machine inside a lift When the lift goes upwards g with acceleration the machine shows the reading 50 kg wt When the lift goes 4 downward with acceleration the reading of the machine in kg wt would be

is 22cm and 48cm away from the mean position Find its time period and amplitude Ans 2 331sec 56 44cm Calculate the fraction of kinetic energy and potential energy to the total energy when the displacement of the particle executing simple harmonic oscillation is 1 3 of its amplitude Ans E E 8 9 E E 1 9

A converging lens of power 2 D is placed in contact with another lens of power 1 D The combination will behave as A converging lens of focal length 100 cm O A converging lens of focal length 50 cm A diverging lens of focal length 100 cm A diverging lens of focal length 20 cm

40 Given below are two statements labelled as Assertion A and Reason R Assertion A A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region If an electron is projected along the direction of the fields with a certain velocity its velocity will decrease Reason R Magnetic force on a charged particle moving in a magnetic field does no work on the particle Select the most appropriate answer from the options given below 1 Point Both A and R are true and R is the correct explanation of A

Light of wavelength 500 nm is incident on two slits separated by 1 mm in YDSE What is width of each bright band if screen is 1 m away from slit planes 0 2 mm O 0 25 mm O 0 3 mm 0 5 mm

HIS and secondary of a 20 mH and 90 mH al induction between and resistance for ter NEET Part II A train is moving on a straight horizontal track Induced emf across the axle is maximum when it moves 1 At poles 2 At equator 3 Along the direction where angle of dip is 45 4 emf is not induced A square loop enters a magnetic field with velocity v as shown in figure The front edge enters the magnetic field at time t 0 Which of the following anh gives the correct variation of emf induced 3 PA 4 d 10 53 Self inductance of a s decreasing through it induced in the solen

21 22 Find out mechanical advantage in given figure 1 4 3 2 1 W 2 3 4 1 A boy sitting on the topmost berth in the 21 fagfiffy 22 1 4 3 2 S W 2 3 4 1

16 A circular ring of radius square having side a a r The mutual inductance of the system is 1 Mor2 a 2 2 2 Horz 3 2 2 or a 4 2 2 Hor

f inductance of two n a core as shown in inductance of each n is moving in ed v If B I and and R is the ower delivered Last Leap for NEET Par a semicircular conducting loop ACB is rotating with constant angular velocity to about O the which of the following graphs shows the variation induced current with time t The magnetic field is perpendicular to the plane of loop as show in the figure 1 3 3 100 B X X X X xxx XXX X X X X X X xxx X X xXx X X E N p 2 2 he M 2 4 2 nel slotti The circu 2 Dec 3 Fee 4 All The so axis P plane the loc 1 2 3

An electric bulb is marked 100W 220V If the supply voltage drops to 110V what is the total energy produced by the bulb in 20 minutes 1 Point O 30kJ O 15kJ O 10kJ O 5kJ

A parallel plate capacitor is charged to 60 C 7 Due to a radioactive source the plate loses charge at the rate of 1 8 x 10 C s the magnitude of displacement current is 1 1 8 10 C s 2 3 6 10 C s 3 4 1 10 C s 4 5 7 x 10 2 C s x 60 fera ti ya 1 810 C sta effet 1 1 8 x 10 2 3 6 10 3 4 1 x 10 C s 4 5 7 x 10 2 C s C s C s

A mass M is divided in two parts m and M m 35 Now two parts are connected by an ideal string passing over a pulley as shown in diagram Find value of m such that tension in string is maximum 1 m 0 3 m M m M m 2 m 4 m M M 34 di via facer y farcit Bicht Jordi gesucri reit s s i m s fra safe 1 m 0 MM m 3 m M 3 M m 2 m 4 m MN MA

10 In a resonance tube experiment resonance occurs with a tuning fork of 1 point frequency 420 Hz when the resonating length of the air column is 20 cm What is the velocity of sound in air Oa 300 m s Ob 336 m s Oc 310 m s Od 320 m s

Two blocks of mass M 6 kg and m H 3 kg are placed as shown in the figure Coefficient of friction between M and m is 0 5 Coefficient of friction between M and the surface is 0 4 The maximum horizontal force that can be applied to the mass M so that they move without separation is g 10 ms 1 41 N 2 61 N 3 81 N 4 101 N ALLEN m 3 kg M 6 kg M 6 3 fan anat geen ant 0 5 fm 3 Tu for at 0 4 TERIMA SEI CHIRI SI FET g 10 f m 3 kg M 6 kg 1 412 2 61 3 81 55 4 101

4 2 A long horizontal wire AB which is free to move in a vertical plane and carries a steady current of 20A is in equilibrium at a height of 0 01m over another parallel long wire CD which is fixed in a horizontal plane and carries a steady current of 30A as shown in figure 4 248 Show that when AB is slightly depressed it executes simple harmonic motion Find the period of oscillations i 20A B