Physics Questions

2 Two newspapers A and B are published in a city It is known that 25 of the city population reads A and 20 reads B while 8 reads both A and B Further 30 of those who read A but not B look into advertisements and 40 of those who read B but not A also look into advertisements while 50 of those who read both A and B look into advertisements Then the percentage of the population who look into advertisements is 2019 Main 9 April II a 13 5 c 12 8 b 13 d 13 9

Which of the following transitions of He ion will give rise to spectral line which has same wavelength as some spectral line in hydrogen atom Question Type Single Correct Type 1 2 3 4 n 4 to n 2 n 6 to n 5 n 6 to n 3 None of these

5 In the relation h 2Tcos a r pg where h is the height T is surface tension p density and r is the radius of a capillary tube a is angle of contact and g is acceleration due to gravity Verify the correctness of the equation

A particle A having with a charge q 5 x 107C is clamped in vertical wall A small ball B of mass 100 g and having equa charge is suspended by an insulating thread of length 30 cm from the wall The point of suspension is 30 cm above the particle A as shown in figure 1 30 Find the angle 0 which the thread makes with the wall in equilibrium Take g 10 m s 30 cm 30 cm BO

e 16 Two bodies A and B of equal masses are kept at heights of h and 2h respectively What their potential energies 17 What is the kinetic energy of a body of mass 1 kg moving with a speed of 2 m s 18 Is potential energy a vector or a scalar quantity of 100 kg is pulled up by 5 m Calculate the work done g 9 8 m s

Gourav purchased 5 pens 3 bags and 1 instrumental box and pays 16 From the same shop Dheeraj purchased 2 pens 1 bag and 3 instrumental boxes and pays 19 Ankur purchased 1 pen 2 bags and 4 instrumental boxes at 25 Based on this information answer the following questions

A particle is attached to the lower end of a uniform rod which is hinged at its other end as shown in the figure Another identical particle moving horizontally collides inelastically and sticks to it The minimum speed of moving particle so that the rod with particles performs circular motion in a vertical plane will be length of the rod is l consider masses of both particles and rod to be same m l

49 Figure shows the position of a particle moving on the x axis as a function of time m 20 10 0 2 4 6t s 1 The particle has come to rest 4 times 2 The velocity at t 8 s is negative 3 The velocity remains positive for t 2 s to t 6 s 4 The particle moves with a constant velocity A particle moyen ninn

Two balls are projected upward simultaneously with speeds 40 m s and 60 m s Relative position x of second ball w r t first ball at time t 5 s is Neglect air resistance 1 20 m 3 100 m 2 80 m 4 120 m

While taking records of car sales in the showroom a salesman mistakenly calculated the number of cars as 530 cars The actual number of cars is 604 cars From this information find a the absolute error b percentage error For the toolbar press ALT F10 PC or ALT FN F10 Mac

The energy of the four non interacting identical fermions and bosons in one dimensional box of size a is Answer b c d D Sh 4h ma 2ma Sh 2h ma ma 10 3 2ma 2ma 2A ma 2ma A

111 A In a B decay in a nucleus a daughter nucleus that has discrete energy states is produced The daughter nucleus reaches ground state from excited state by emitting y ray B The binding energy of hydrogen nucleus is far less than the binding energy of helium nucleus 1 A False B True 3 A True B True 2 A Truc B False 4 A False B False

34 Two steam engine A and B have their sources respectively at 700 K and 650 K and their sinks at 350 K and 300 K Then A A is more efficient than B B B is more efficient than A C both are equally efficient n depends on the fuels used in A B

A stone is thrown with a velocity of 20 ms at an angle 60 with the horizontal The speed of the stone when its direction of motion makes 45 with the horizontal is Se rodo 60 so 5 o 20 ms kos 35o6 an dexir Be 3ro660 45 58 Options 1 28 28 ms 1 2 14 14 ms 1

46 Mass of proton 1 67 MG0275 A circular coil placed in a uniform magnetic field If alternating current flows through this coil then 1 net force will act on coil 2 coil will be stationary 3 coil will be rotated 4 coil will move on straight line MG0276 50 2 3 4 A

33 Electric charges are distributed in a small volume The flux of the electric field through a spherical surface of radius 10 cm surround ing the total charge is 25 V m The flux over a concentric sphere of radius 20 cm will be A 25 V m B 50 V m C 100 V m D 200 V m

When capillary is dipped into liquid the levels of liquid inside and outside are equal The angle of contact is R RR A Zero B 90 C 45 D 60 e Your Answer

5 Two identical containers joined by a small pipe initially contain the same gas at pressure po and absolute temperature To One container is now maintained at the same temperature while the other is heated to 2To The common pressure of the gases will be 3 a Po b 4 3 Po c 5 Po d 2po

105 The temperature of a steel rod placed between rigid supports and of length L area of cross section A Young s Modulus Y and coefficient of linear expansion a is raised by T The amount of work done when heated is a L s a as at a 45 45 rog o A do Min ro boards dd Joesos 2005 30 35 YAG T L 2 YA QIL 2 Y do 298 fatia og dod 00 T 3 YA a T 4 YAaT L

A The coil of moving coil galvanometer is wounded on a metallic frame R Metallic frame provides larger moment of inertia hence smooth oscillations are possible

4 A particle which is constrained to move along the x axis is subjected to a force in the same direction which varies with the distance x of the particle from the origin as F x kx ax Here k and a are positive constants For x 0 find the functional form of the potential energy U x of the particle

This section contains 7 multiple choice questions Each question has 4 choices A B C and D for its answer out of which ONE OR MORE is are correct Three identical cylinders each of mass M and radius R are in contact and kept on a rough horizontal surface coefficient of friction between any cylinder and surface is A force F Mgt acts on the first cylinder Mark the correct statement F umgt H 0 4 0 500 A The cylinders will start pure rolling and keep on rolling without sliding B Att 9 second slipping will start C Velocity of centre of mass of each sphere will keep on increasing D After a certain value of F angular velocity of each sphere will become constant m

4 80 m 39 The position time graph for a body moving along a straight line between O and A is shown in figure During its motion between O and A how many times body comes to rest 1 Zero 2 1 time 3 2 times A

1 52 The electric field in a region is given by Ex 1 i Find the charge contained inside a cubical volume bounded by the surfaces x 0 x a y 0 y a z 0 and z a Take E 5 x 10 N C 1 2cm and a 1cm

A and B are two concentric metallic hollow spheres If A is given a charge q while B is earthed as shown in figure then B A x 1 charge density of A and B are same 2 field inside and outside A is zero 3 field between A and B is not zero 4 field inside and outside B is zero

When I am in lift if I consider physics then I am not rest according to the outside but I see all rest inside the lift and outside all are rest if you think by physics So I define that I am acclerated and got non innertial frame and as inside the lift all are rest according to me and vice versa I add pseudo force for valid Newton s law And result is finally valid

1 Choose the most suitable answer and fill in the blanks 1 The village town or city you live in is a a neighbourhood b community c rural area 2 There are different types of in a community a neighbourhoods b houses c buildings 3 Villages are a part of the a urban 4 Urban areas are not major activities that are carried out there a important look b alike size b local community c rural They differ in and c good age

5 If R is the radius of the earth and g the acceleration due to gravity on the earth s surface the mean density of the earth is A 4 G 3gR B 3TR 4gG C 3g 4TRG D Rg 12G

A particle is thrown vertically up with velocity 10 m s from a point P which is 10 m above the ground Time after which particle reaches the ground g 10 m s 10 m s 10 m 0 3 1 s O 3 1 s 02 S 3 s

116 The magnetic flux linked with a coil varies with time as 31 41 9 webers The induced emf at 1 2 sec is as in pobo do Dar rod 31 41 9 r sy 1 2 sec 5 505 Digger worn Jess Bebeur 1 1 V 2 6 V 3 16 V 4 10 V

114 An electromagnetic wave is travelling in a medium of permeability and permittivity e If e is speed of the wave in free space then the refractive index of the medium is a as Dagdas bordad son riso pardo e do o y no 040 38955 Momso C 11 3 no cod rito ant 4

110 pn junction diodes are arranged as shown in the figures A and B Identify the bias applied to the diodes mA A 1 Both A and B show forward bias 2 Both A and B show reverse bias 3 A shows forward bias B shows reverse bias 4 A shows reverse bias B shows forward bias B

Five identical polaroids are placed coaxially with 45 angular separation from adjacent one as shown in figure lo Intensity of unpolarised light The intensity of light emerging out of 5th polaroid is Only one correct answer A B 5 C To 3 2 1

Option No Option Orientation Vertical A piece of metal weighs 34 g in air When it is immersed in a liquid of specific gravity 1 24 at 27 C it weighs 32 g When the temperature of the liquid is raised to 42 C the metal piece weighs 31 g Specific gravity of the liquid at 42 C is 1 2 The coefficient of linear expansion of the metal is 25 55 55 20 34 g og 1 24 27 C 0506 ed 32g 655 42 C 6 bod ky s moj od 1 2 0 Snows 5 31 g 500 5 Options www android previousquestionpapers com www previousquestionpapers com www ios previousquestionpapers 1 www android universityupdates in www universityupdates in www ios universityupdates in 3 0 0122 K 2 0 00122 K 1 0 122 K

Which of the following is incorrect about electrostatic force Only one correct answer A B C D It is conservative It is a central force Electrostatic field lines never intersect It also depends on mass content of body

47 The velocity versus time graph of a body moving in a straight line is as shown in the figure below v m s C t s 1 The distance covered by the body in 0 to 2s is 8m 2 The acceleration of the body in 0 to 2s is 4 ms 2 3 The acceleration of the body in 2 to 3s is 4 ms 2 4 The distance moved by the body during 0 to 3 s is 6 m 5

113 In Davisson Germer experiment the decrease of the wavelength of the electron wave was done by 1 keeping the same potential difference between anode and filament 2 decreasing the potential difference between anode and filament 3 increasing the potential difference between anode and filament 4 keeping more distance between the anode and filament

The de Broglie wavelength of an electron in first orbit of hydrogen atom is equal to Only one correct answer A Diameter of the orbit B C Perimeter of the orbit Half the perimeter of the orbit

106 The ratio of the pressure P on a swimmer 10 m below the water surface of a lake to that of the pressure on the surface of water P Atmospheric pressure 1 10 Pa 1000 kg m 10 m s is ut be rose be de 38 10 5 1 a adop bassess be doing sony base de Daze wede bas2 1 10 Pa p 1000 kg m g 10 m s 115 2 2 4 3 3 Zero

A wheel of mass 10 kg and radius 0 8 m is rolling on a road with an angular speed 20 rads without sliding The moment of inertia of the wheel about the axis of rotation is 1 2 kgm then the percentage of rotational kinetic energy in the total kinetic energy of the wheel is approximately

2 points possible graded A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 807 N on hi The mass of the losing player plus equipment is 89 kg and he is accelerating at 1 4000000000000001 m s backward a What is the force of friction between the losing player s feet and the grass b What force does the winning player exert on the ground to move forward if his mass plus equipment is 106 kg

120 A non conducting ring of radius R has charge Q distributed over it If it rotates with an angular velocity to the equivalent current is Ragg Ko L o po Shine gamin d 360 og 2 Qo to Q 56063350 do F da Des dags Bart Qu 4 D

Sop Boud oss doo h 500 of 50 borge wood and 5 a 50 50 60 bed so b ordu oro 5 aus 5035 50000 Options b 2a b 2 3 2a 3a b 3a 2a b 36 2 h

3 3 Qa TCE X 4 Zero 1 Parabola 2 Circle 3 Pair of straight lines 4 Hyperbola fie 6 8 The locus of points such that electric field due to a short dipole is perpendicular to the direction a dipole moment is

Draw an orbital energy level diagram like those in Fig 23 23 showing the configuration of the d electrons on the metal ion in each of the following complexes a Co NH3 6 b NiCl4 tetrahedral c Fe H O d Fe CN 6

pject starts from rest from point P and comes to rest at point an acceleration 1 m s and for the remaining with retardation alue of distance PQ on same straight line It moves the first part of the dista 2 m s If time taken to complete the journey is 2 s then

A gas consisting of rigid molecules expands adiabatically such that r m s speed of its molecules becomes half The ratio of final and initial volumes of the gas is ratio of specific heat capacities of the gas is 1 5 4 mox 500S as rows som Jo Bobby Forms 58 SKO OSA J n u 50 453 rero d y Jogge 1 5 www android universityupdates in www universityupdates in www ios universityupdates in www android previousquestionpapers com www previousquestionpapers com www ios previousquestionpapers Options 1 16 1 21 16 3 4 1

Question Number 98 Question Id 4557344738 Question Type MCQ Display Question Number Yes Single Line Question Option No Option Orientation Vertical Certain quantity of heat is supplied to a monatomic ideal gas which expands at constant pressure The percentage of heat that is used to do work by the gas is as D b rms edoj Jan fod ca cont en go b o g J o o r 5 do Jou s Options 80 1 2 3 20 40 COOL

8 A gas is compressed at a constant pressure of 50 Nm 3 3 from a volume of 10 m to a volume of 4 m Energy of 10 J then added to the gas by heating Its internal 50x6 lov energy is a increased by 400 J c increased by 100 J b increased by 200 J 300 3 decreased by 200 J

Consider a circular wheel rolling no slip along a flat surface The wheel has radius 0 1 m and is rotating clockwise at 2 rad s What is the direction of the absolute velocity vector in the earth fixed reference frame for the wheel s center point O the velocity is zero so it does not have a direction O to the right along 7 O to the left along 7 Odown and to the right with both 7 and components