Physics Questions

2 A shell projected horizontally with a velocity of 165 m s from the top of a 15 m high wall explodes into two identical fragments in the air One of the fragments strikes the ground 1 5 s after the shell was projected at a distance of 240 m from the foot of the wall and 7 m to the right of the x axis Determine position of the other fragment at this instant Neglect air resistance and assume acceleration of free fall to be 10 m s

2016 2017 2 A particle having charge equal to proton and mass 12 10 21 g is thrown parallel to plates as shown in the figure Value of electric field between plates is 1 5 104 V m and length of plates is 10 cm The least initial velocity given to particle so that it is able to come out of the plates is 1 cm 1 cm U 1 4 104 m s 3 2 104 m s 10 cm E 2 3 104 m s 4 1 104 m s

21 The flux of electric field through the circular region of radius r as shown in the figure is 1 2 to r 0 2 Zero 2 r C m

All capacitors were initially uncharged 10 F 1502 1002 www 50V 1502 S F HE A Battery current just after closing of switch S is 3 42 A B Battery current just after closing of switch S is 0 962 A C Battery current after long time of closing of switch S is 3 42 A D Battery current after long time of closing of switch S is 0 962 A

A row of blocks are lined up with masses of 1 94 kg 2 14 kg and 3 71 kg The masses are then pushed forward by a 11 5 N force applied to the 1 94 kg block If the table is frictionless how much force does the 2 14 kg block exert on the 3 71 kg block O5 48 N O 3 16 N 2 51 N 01 45 N

1 Equipotential surfaces associated with an electric field which is increasing in magnitude along x direction are 1 Planes parallel to x z plane 2 Coaxial cylinders of increasing radii around x axis 3 Planes parallel to y z plane 4 Planes parallel to x y plane

equivalent of 16 F with breakdown voltage of 1000 V how many minimum number of capacitance marked 8 F 250 V are required 1 16 2 32 3 2

Various Spectral Lines From a H Like Atom A gas of hydrogen like atoms has some atoms in lowest energy level A and some atoms in a particular energy level B and there are no atoms in any other energy levels The atoms of gas gets exited to higher energy levels by absorbing monochromatic light of photons of 2 7 eV Subsequently during de excitation these atoms emit radiations of only six different spectral lines in spectrum Some of these radiations are of 2 7 eV some have less and some have more than 2 7 eV Find the quantum number of energy level B and ionization energy of these atoms

Two boats were going down stream with different velocities When one overtook the other a plastic ball was dropped from one of the boats Some time later both boats turned back simultaneously went at the same speeds as before relative to the water towards the spot where the ball had been dropped Which boat will reach the ball first Q 1 the boat which has greater velocity relative to water 2 the boat which has lesser velocity relative to water 3 both will reach the ball simultaneously 4 cannot be decided unless we know the actual values of the velocities and the time after which they turned around

26 A current loop consists of two identical semicircula parts each of radius R one lying in the x y plane and the other in x z plane If the current in the loop is i The resultant magnetic field due to the two semicircular parts at their common centre is AIPMT Mains 2010 Hoi 1 2 2R 2 Hoi 2 R Hoi

An electromagnetic wave going through vacuum is described by E E sin kx oot B B sin kx cot Then 1 E B ok 3 Ek B00 E 2 B 0 k 4 E Bok

Seven identical circular planar disks each of mass M and radius R are welded symmetrically as shown The moment of inertia of the arrangement about the axis normal to the plane and passing through the point P is 181 1 MR 2 3 55 2 MR 19 2 4 721 73 2 2 MR MR 0 2018

A block is suspended by an ideal spring of the force constant K If the block is pulled down by applying a constant force F and if maximum displacement of the block from its initial position of rest is 8 then A 8 2F K C 8 F K B 8 2F K 1 KS D Increases in potential energy of the spring is K8

9 A coil in the shape of an equilateral triangle of side is suspended between the pole pieces of a permanent magnet such that B is in plane of the coil If due to a current in the triangle a torque t acts on it the side of the triangle is AIPMT Prelims 2005 1 2 3 Bi T 1 2 1 2 T 2 3 Bi 17 2 1 T

An observer can see through a small hole on the side of a jar radius 15 cm at a point at height of 15 cm from the bottom see figure The hole is at a height of 45 cm When the jar is filled with a liquid up to a height of 30 cm the same observer can see the edge at the bottom of the jar If the refractive index of the liquid is N 100 where N is an integer the value of N is 15 cm 15 cm 45 cm

Consider the cube shown A point charge 8q is placed at a vertex G of the cube and another charge 4q is placed at the centre of an edge AE of the cube Electric flux through the cube is A C q o 12q o 2q o D Zero B A D 4q T E H B C F 8q G

A square loop ABCD carrying a current i is placed near and coplanar with a long straight conductor XY carrying a current I the net force on the loop will be 2uolil a b 3m 2 gli 3T c d Molil 2 Moli 2 NEET I 2016

dashed line A rigid square loop of side length 1 carrying an electric current is held motionless on a frictionless horizontal tabletop A uniform magnetic field pointing upwards is switched on everywhere to the left of the shown in the figure and then the loop is released Considering different lengths of the side segments x and y x y which of the following conclusions can you make a If x 1 2 6 If x 2 1 c If x 2 as and y and y and y 1 and y the loop starts rotating anticlockwise 2 1 the loop starts rotating anticlockwise 2 1 2 the loop starts rotating clockwise 1 x 1 1 2 the loop starts rotating 1 more information is required to decide which way 9 2 of radii a and b are separated by a large is the force of

4 Planes parallel to x y plane 42 An electric dipole is kept in the field of a point charge Q as shown in figure If dipole is at origin then net force on the dipole is Y Point charge O P Dipole 1 Along negative x axis 2 Along positive y axis 3 Zero 4 Along positive x axis Telegram nega Space for Ro

3 The force required to produce an acceleration of 2 m s on a mass of 2 kg is a 4 N b 10 N c 22 N d 18 N

In a vernier callipers with no zero error 7th division of main scale coincides with 10th division of vernier scale when nothing is kept between the calipers Take 1 MSD Imm When a rod of length is kept between the calipers it is found that zero of the vernier lies between the 9th and 10th divisions of main scale and 4th division of the vernier coincides with 12th division of main scale B 10 2mm D vernier constant 0 3mm A 9 2mm C Least count 0 3mm

Q 21 A current carrying closed loop in the form of a right angle isosceles triangle ABC is place in a uniform magnetic field acting along AB If the magnetic force on the arm BC is F the force on the arm AC is A Option A Option B Option C Option D PRAN 2F F

rv A particle is projected at an angle 60 with horizontal with speed 10 m s The time after which the s 1 of the particle remains times of its initial speed is 3 1 5 3 s 2 S 1 3 s 4 10 3s above

3 4 Q 34 Four cells of emf and internal resistance as shown are connected in parallel The equivalent cell between A and B will have internal resistance and emf as uestionpaper A 1 2 1 3 9 1V gh Work 1 V 2 V 3 V 4 V 618 a wwww wwwwww 192 wwwwww 192 192 2 2 2V 4 2 2V 4 B

4X A straight conductor carrying current i splits into two parts as shown in the figure The radius of the circular loop is R The total magnetic field at the centre P of the loop is NEET 2019 Odisha Hol 1 2R 2 Zero 3 3 i 32R outward inward 90

45 A point charge q is kept inside an electrically neutral estion the potential at point P would be estionpa ell with its outer surface spherical in shape then q 1 4 E OR q R ro r O centre of sphere 2 9 9 4 or P q 400

2 A particle of mass m is fixed to a string of l The particle is given a horizontal velocity of 5gl at the lowermost position Calculate the net acceleration when the string becomes horizontal 1 10g 3 g 12 2 3g 4 2g

8 Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil What is the ratio of potential difference applied across them so that the magnetic field at their centres is the same 1 3 3 6 AIPMT Prelims 2006 2 4 4 2

5 Figure shows two conducting thin concentric shells of radius r and 3r The outer shell carries charge q Inner shell is neutral The charge that flows from inner shell to the earth after the switch S is closed is q tionpaper 1 q 3 03 3r 2 Zero 2q 3

Q No 19 If magnitude of dispersive power of two lens are 0 024 and 0 036 then focal length be for aberration free combination 1 2 3 30 cm 40 cm 30 cm 45 cm 10 cm 30 cm 20 cm 35 cm Correct Answer 2 Status unattempted

A circular coil is in y z plane with centre at origin The coil is carrying a constant current Assuming direction of magnetic field at x 25 cm to be positive direction of magnetic field which of the following graphs shows variation of magnetic field along x axis a c B to 0 d B B 0 X

3 Problem 8 The force F 6 28 N i 4 15 N j acts on a particle as it moves along a straight line from Cartesian coordinate 0 75 m 3 49 m to 7 55 m 8 41 m What is the work done in joules by the force

A 101 2 kg person sits on a 4 0 kg bicycle The total weight is borne equally by the two wheels of the bicycle The tires are 0 013 m wide and are inflated to a pressure of 8 6 x 105 Pa What length in m of each tire is in contact with the ground

4 In the determination of Young s modulus by using Searle s method a wire of length L 2 m and diameter d 0 5 mm is used For a load M 2 5 kg an extension 0 25 mm in the length of the wire is observed Quantities d and I are measured using a screw gauge and a micrometer respectively They have the same pitch of 0 5 mm The number of divisions on their circular scale is 100 The contributions to the maximum probable error of the Y measurement Y 4MLg Ald A due to the errors in the measurements of d and I are the same B due to the error in the measurement of d is twice that due to the error in the measurement of 1 C due to the error in the measurement of I is twice that due to the error in the measurement of d D due to the error in the measurement of d is four times that due to the error in the f 1

3 Eo V 4 91 92 93 80 27 small drops of same size are charged to V vo each If they coalesce to form a single large dro then its potential will be 1 3V 2 9V 5717

19 Four similar point charges q are located at t vertices of a regular tetrahedron of edge length a T interaction energy of the system of charges is 3q 1 ATE 3 q O O 2 400 3q Telegram

w 7 A charge q is uniformly distributed over a quarter circular ring of radius r The magnitude of electric field strength at the centre of the ring will be 29 Mar 4 9 3 2 2 4T of 4

When a proton is released from rest in a room it starts with an initial acceleration ao towards west When it is projected towards north with a speed v it moves with an initial acceleration 3a toward west The electric and magnetic fields in the room are a b c mag e mao e mao C east east west 3mao evo 3mao down evo 2mao evo up up

0 Two equal electric currents are flowing perpendicular to each other as shown in the figure AB and CD are perpendicular to each other and symmetrically placed with respect to the currents Where do we expect the resultant magnetic field to be zero C 11 A a On CD b On AB c On both OD and BO d On both AB and CD B a D 1006

B A cylindrical conductor of radius R is carrying a constant current The plot of the magnitude of the magnetic field B with the distance d from the centre of the conductor is correctly represented by the figure NEET 2019 B 1 3 Rd B VAA ISC Rd 2 4 B B R d R d

Q 11 The potential energy of a system increases if work is doneyu Option A Upon the system by a conservative force Option B Option C Upon the system by a non conservative force By the system against a conservative force Option D Correct Option C By the system against a non conservative force LIVE

For the magnetic field to be maximum due to a small element of current carrying conductor at a point the angle between the element and the line joining the element to the given point must be 1 0 2 90 3 180 4 45

6 Consider a disc rotating in the horizontal plane with a constant angular speed about its centre O The disc has a shaded region on one side of the diameter and an unshaded region on the other side as shown in the figure When the disc is in the orientation as shown two pebbles P and Q are simultaneously projected at an angle towards R The velocity of projection is in the y z plane and is same for both pebbles with respect to the disc Assume that i they land back on the disc before the disc has completed rotation ii their range is less than hal 8 the disc radius and iii remains constant throughout Then R e of P A P lands in the shaded region and Q in the unshaded region B P lands in the unshaded region and Q in the shaded region C Both P and Q land in the unshaded region D Both P and Q land in the shaded region

The displacement of a particle in SHM varies according to the relation x 4 cos t sinnt The amplitude of the particle is Question Type Single Correct Type 1 2 3 4 4 4 2

5 In the circuit shown choose the correct option All batteries are ideal 10 V 4 V 392 1 Power dissipated in 3 2 resistance is 12 W 2 Current in the circuit is 6 A 3 Power supplied by 10 V battery is 40 W

26 A charge Q is placed on middle of edge of the cuber Then electric flux through cube due to field of charge Q is Q 1 BEO to Q 3 20 Q 4 40 27 Two charges each having magnitude and same Telegram

An object is placed 8 cm away from a mirror with focal length 12 cm Which of the following statements i corre O The image is virtual and on the opposite side of the mirror as the object O The image is real and on the same side of the mirror as the object O The image is real and on the opposite side of the mirror as the object O The image is virtual and on the same side of the mirror as the object

View In English A composite rod comprising two rods of mass m and 2m and each of length I 1 m as shown in the figure Assume w 10 rad s and m 1 kg the KE of the rotating composite rod is 0 2 3 4 125 J 150 J 250 J 175 J Correct Answer 3 Status unattempted Add to Bookmark List www BONN D 64 m 2m k Peer Stat Unattempted 49 4 Correct 35 7 incorrect 14 9 Five charges of equal magnitudo placed at corners of a regular pontogen of Your ADSINGL A TEN View

There exists a magnetic field in a cylindrical region of radius R The magnetic field is increasing at a constant rate a with respect to time The magnitude of induced electric field at a distance of R from the axis of the cylindrical region will be O O aR 2 aR 4

13 Four point charges are placed on vertices of a square If all the charges are brought to any one of the vertices The change in potential at the centre of square due to this would be 1 Dependent on polarity of charges 2 A non zero constant 3 Zero 4 Infinite