Physics Questions

constant velocities along X axis at time t seperation between both is 20 m Take usu sign convention Choose correct graph position of A with respect to B AB vs time 6m s 4m s A B C A 0 0 0 20 m r TAB TAB A B A B 10 10 10 B t t

10 A book has a mass of 400 g The surface of the book in contact with a table has dimensions 0 10 m 0 20 m The gravitational field strength g is 10 N kg What is the pressure exerted on the table due to the book A 0 08 N m B 8 0 N m C 20 N m D 200 N m

Two students carry out different experiments to compare the abilities of different metals to conduct thermal energy heat metal bar ABC D melted wax strip length of melted wax strip experiment 1 experiment 2 in experiment 1 the bar is heated for one minute and the length of wax strip that melts is measured decreases decreases In experiment 2 the bar is heated and the time taken for the pin to drop off is measured What happens to each of these measurements when a better conductor of thermal energy is tested increases 1 heat increases metal bar time taken for the pin to drop decreases increases decreases increases wax pin

In the circuit shown P R the reading of the galvanometer is same with switch S open or closed Then 1 R IR IG S ww H a Question Type Single Correct Type G

SI TO A particle moves along a straight line OX At a 3 time t in second displacement of the particle from O is given by x 40 12t t How long would the particle travel before coming to rest 1 24 m 2 40 m 3 36 m 4 16 m The position x of a particle with respect to time t X 1441 x 40 121 FITH STRUTH T H Th i i en 1 24m 2 40 m 3 36 m 4 16 m faika za

A ray of light will not come out of a prism prism angle A for any value of angel of incidence The refractive index of material of prism is Which of he following relation satisfy the above condition O T sin A

5 Meter Bridge is device based on wheatstone bridge with resistances connnected in a particular fashion It can be used to obtain unknown resistance One of the resistance wire used is of 1 m length giving its name A jockey is used to obtain the neutral position diving the circuit in two parts 1 Draw a inducative diagram representing above detail of meter bridge ii Can a meter bridge be made with 2 m long wire instead of 1 m iii Which device is connected to jockey to detect the flow of current and obtain neutral point iv If neutral point is mid way and standard resistance used is 10 2 then what is the value of unknown resistance V What can we conclude if we don t get any neutral point 2 1 2 1 2 1 1

Under what conditions current passing through the resistance R can be increased by short circuiting the battery of emf E The internal resistances of the two batteries are r and r respectively A E r E R C E E E R B E E R r D E r E R r E 12

3 18 sec 4 9 sec A coin is released inside a lift at a height of 2 m 20 from the floor of the lift The height of the lift is 10 m The lift is moving with an acceleration of 9 m s downwards The time after which the coin will strike with the floor of lift is g 10 m s 2 2 s VIT A swimmer can swim in still water with speed v 21 2 18 sec 2 m fi SE E 10 m 1 1979 m s a di i anhgia af 4 g 10 m s e au fost r 4 9 sec V 2 2 s S

A box with a mass of 5 0 kg that is moving at 4 0 m s on horizontal frictionless surfaces runs into a light spring with a force constant of 80 0 N cm a Using the work energy theorem find the maximum compression elongation of the sp b What amount of force does the spring exert on the box at the position of maximum compression

10 A carnot engine having an efficiency of t of heat engine is used as a refrigerator If the work done on the system is 10 J the amount of energy absorbed from the reservoir at lower temperature is a 1 J b 90 J c 99 J d 10 I

A body of mass 5 kg starts from the origin with an initial velocity u 30i 40j m s If a 5 constant force F i 5j N acts on the body the time in which the y component of the velocity becomes zero is 1 5 sec 2 20 sec 3 40 sec 4 80 sec 5 free ye fang sefore m 30i 40j m s fave F fy 1 5 sec 3 40 sec 2 20 sec 4 80 sec 1

8 Given C 2uF C2 4 F C3 8 F C C2 C3 are initially uncharged Initially all the keys are open Then 6h www 12 V 3h 12 h www Tim k C A In steady state after closing k alone the charge in capacitor C is zero B In steady state after closing ki alone the charge in capacitor C and C3 are 8 C and 4 C C In steady state after closing ki alone the current drawn from the cell is 2A D In steady state after closing k and k the current drawn from the cell is 1A

2 3 1 6 5 7 1 1 0 A Rotating earth b trees c wall d ground Velocity is a Distance time b displacement time c force velocity d distance velocity Acceleration is a Change in velocity time b change in position time c motion distance d force velocity What type of motion is described by a stone which moves in a circular path with constant speed a Uniform circular motion b motion c velocity change d distance covered Which is solid a Air b water c milk d Gold Which is rgid a Air b water c milk d Gold Which can be flow A chalk b chair c milk d Gold What are weeds What is intercropping What is cron rotation 1 1 1 1 fund 1 alab 1 1

Phy Section A This section contains 35 SINGLE CORRECT TYPE questions Each question has 4 choices 1 2 3 and 4 out of which only Six identical capacitors each of capacitance Care connected as shown The equivalent capacitance between points A and Bis HH O 20 3 E

31 4 Given moss m of leryth e imparted J bob of ii find Just the a string momenten i Draw diagram of p of bob Bob 6 E of offer letting ground

maximum speed with which a person can swim in the still water He intends to cross the river by shortest possible path i e he wants to reach the point on the opposite bank which is directly opposite to the starting point Which of the following is correct A He should start normal to the river bank He should start in such a way that he B moves normal to the bank relative to the river He should start in a particular calculated C direction making an obtuse angle with the direction of water current D The man cannot cross the river in that way

The pressure applied from all directions on a cube is P How much its temperature should be raised to maintain the original volume The volume elasticity of the cube is and the coefficient of volume expansion is a Question Type Single Correct Type 1 2 P a Pa B PB

30 ALLEN The equivalent resistance between the points A 30 fefe for in and B in the following circuit is www 1 3 120 3 6 240 50 B www www 150 2 1 560 4 12 480 B 1 3 120 3 6 2402 www www www 50 www SO 2 1 560 4 12 480

Two particles are fixed to an x axis particle 1 of charge q1 2 73 x 10 8 C at x 17 0 cm and particle 2 of charge q2 5 29q1 at x 76 0 cm At what coordinate on the x axis is the electric field produced by the particles equal to zero

A light cylindrical vessel of radius r is kept on a rough horizontal surface so that it cannot slide but can topple It is filled with water upto a height 2h and a very small hole of area a is punched it so that the water that will come out of it falls at the maximum distance from its wall along horizontal surface Water comes out horizontally from the hole The maximum value of h for which the cylinder does not topple is 1 2 3 Question Type Single Correct Type 2 r a Hole 3 r 2a 2r 2h

20 The 51 0cm diameter disk rotates counterclockwise on an axle through its center F1 62 2N F2 74 5N F3 74 5N F4 62 2N and d 7 51cm What is the net torque about the axle Let the counterclockwise direction be positive Fa d 469 d X

9 28 4 0 1A The equivalent resistance between A and B is 1 4R AO Bo The potent 2R2R 2 2R 3 R 2R 4 0 5R 28 3 0 25 f Afri NO BO wwwwww U SUPPR 4 0 1 ofbrat 2R2R 1 4R 2 2R 3 R 2R 4 0 5R

ALLEN A boy is running on a levelled road with velocity V 22 with a long hollow tube in his hand Water is falling vertically downwards with velocity u At what angle to the vertical should he incline the tube so that the water drops enters without touching its side 1 tan 3 tan 1 2 sin 4 cos van artister V and hea fter fond ge e a fan gach 2 sin 4

A constant potential difference is maintained between the ends of a conductor having non uniform cross section Which of the following quantities will not change along the length of the conductor drift speed b electric field c resistance d current

If x and y denote the distances of the object and image from the focus of a concave mirror The line y 4x cuts the graph at a point whose abscissa is 20 cm The focal length of the mirror is 120 cm Question Type Single Correct Type 2 40 cm y 3 30 cm X

the tension in the rope of mass M length L at the given point P as shown in the figure 44 x drx xx X dml M 1 mg xg L 3 mg Mg M L m F my Tp di 1 2 Z M 2 mg L x g 4 Zero

34 A particle of mass 4kg moving with a speed s collides with a train moving in an opposite direction with a speed of 20m s If coefficient calculate the final speed of the 1 2 particle in m s 1 5 3 20 restitution e 2 15 4 35 Of

Q 14 A positively charged sphere A is brought close without touching to a neutral sphere B Sphere B is touched with a grounded wire What is the charge on sphere B after the wire is removed A a positive b Negative c It stays neutral B d It depends on the contact time 1 poir

Three large identical conducting plates are placed at a distance d in air The space between the first two plates is filled completely with dielectric of dielectric constant 2 as shown The plates are given charges 7Q 3Q and 2Q respectively The outer plates are connected by good conducting wire through switch S When S is closed the charge that flows through switch is nQ Find the value of n 7Q 3Q 2Q LI K 2

Q285 A screen is placed 90 cm from an object The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm The focal length of the lens is 1 18 81 cm 2 20 04 cm 3 13 01 cm 4 21 39 cm 1 2 3 4 We see that your answer is incorrect Please

R 7 Two buildings are separated by 30 m By what 17 speed a ball is projected horizontally from a window at height 150 m in one building so as to enter in the window at height 27 5 m in the other building 1 2 m s 3 4 m s 2 6 m s 4 8 m s EADER TEST SERIES JOINT PACKAGE COURSE R 30 gra 150 m fra forset fed f tan and for sa del 27 5 m fra fors 1 2 m s 3 4 m s 2 6 m s 4 8 m s 0999DMD310320002

A ray of light is incident at an angle of incidence 0 as shown in fig If the angle between the two plane mirror is 90 then for what value of 0 the reflected ray from the 2 nd plane mirror becomes parallel to the incident ray 30 45 60 All of these

In given meter bridge circuit length of wire AB is 1m When resistance X is shunted by R resistance then balancing length from A is found to be 20 cm Find value of R A X 69 ww C r 32 www 6 B Question Type Single Correct Type

A vernier calipers and a screw gauge have the same least count and zero error with the difference that the vernier calipers has positive zero error and the screw gauge has negative zero error The number of circular scale divisions on the screw gauge is twice the number of vernier scale divisions on the vernier calipers and the pitch of the screw gauge is 1 mm If the vernier coinciding division and the circular scale reading for the zero error on the instruments are 3 and 97 respectively then find the number of vernier scale divisions on the vernier

If the momentum of an electron is changed by p then the de Broglie wavelength associated with it changes by 0 5 The initial momentum of the electron will be 1 200p 2 400p 3 P

Drops of a liquid are falling from the top of a 8 building of height 20 m at regular interval such that when 1st drop reaches the ground third is about to fall then find the time interval between them second 2 1 second 3 2 second min second 20m fit for ve fufa del af at 2 at de fron aus 3 2 v 2 1 v 4

A crane is used to lift loads vertically The output power of the crane to lift a car is P The crane then lifts a lorry which has 3 0 times the weight of the car through 0 25 of the distance in 0 50 of the time What is the output power of the crane now 3P 3P A D A B 00 C 8P D 6P

If 1 000 g of 226Ra refer to notation shown produces 0 0001 mL of the gas 222Rn refer to notation shown at STP standard temperature and pressure in 24h what is the half life of 226Ra in years Answer i e 1 x 10 or 1 x 10 2 226 P Da 222 Rn

An extended object is initially at rest on a frictionless horizontal surface as shown in the figure At t 0 the forces F F2 and F3 start applying on the object The net force acting on this object is equal to Fnet F F2 F3 and the net torque acting on the object with respect to an axis perpendicular to the table and passing through the center of mass marked with CM is equal to 7 net 71 72 73 What can we say about the motion of this object Mark all that apply F F3 CM F Select one or more a If Fnet 0 but net 0 the center of mass of the object will stay at rest but the object will start

A B What is the resultant force on the object 1N to the left 1 N to the right 7N to the left 7N to the right C The diagram shows a solid object on a flat surface with two forces acting on the object D 3N 4 N

A disk of radius 4 having a uniformly distributed charge 6 C is placed in the X Y plane with its centre at a 2 0 0 A rod of length a carrying a uniformly distributed charge 8 C is placed on the x 5a a axis from x 4 to x 4 Two point charges 7 C and 3 C are placed at 3a 3a 44 34 0 a a 2 2 0 and respectively Consider a cubical surface formed by six a a surface x 2 y electric flux through this cubical surface is y a 2 z 2 The X

A rectangular tank is filled completely with water A hole at its bottom is unplugged The graph between the velocity of efflux through a small hole vs depth of water h from the top of tank is Question Type Single Correct Type 2 3 4 L h h h

Displacement of a particle at time t is expressed as s 1 31 Now the acceleration of the particle at the time when the velocity vanishes 2 is Answer 0 0 00 01 02 02 0 3 03 04 04 05 05 06 06 07 07 08 08 09 09

For the magnetic dipole in the figure find the force exerted by first dipole on the second dipole Where m m and m m determine whether the force is repulsive or attractive m2 y

A student suggests that there are several ways of transferring energy to a small stationary block of iron on a smooth table He makes the following suggestions 1 A 3 Heat it Shine light on it Pass a current through it Which suggestions are correct 1 and 2 only B 1 and 3 only C 2 and 3 only D 1 2 and 3

An object is pivoted at point P A student ties a length of string to a peg on the object He pulls the string with a force F peg B Fxr What is the moment of the force F about the point P A Fxq string C Fxs object D Fxt

38 Two trains are approaching each other on parallel tracks with same velocity The whistle sound produced by one train is heard by a passenger in another train If actual frequency of whistle is 620Hz and apparent increase in its frequency is 100Hz the velocity of one of the two trains is Velocity of sound in air 335 ms 1 90kmph 2 72 kmph 3 54kmph 4 36 kmph

Two planets A and B have same mass and radii R The variation of density of the planets with distance from centre is shown in the following diagrams The ratio of acceleration due to gravity at the surface of the planets A and B will be P 1 1 Question Type Single Correct Type 2 1 R 3 1 R

ALLEN 11 Velocity time graph of a particle undergoing 11 farm to h rectilinear motion is plotted upto T t as shown in the figure Average acceleration of the particle is zero in time interval 1 0 and t 3 and t VA 15 10 5 N 1 4 2 1 and t 4 and t sted i V 15 10 1 Ot 3 of M 1 4 4 2 1 1 4 5 1