Physics Questions

2 52 Find the node voltages in the circuit in Figur P2 52 1 kn V 6V Download Attachments 2 kn V 12V V3 2 kn 2 mA FIGURE P2 52 1 kn VA 1 kn

d 2 70 A 20 kg box rests on the flat floor of a truck The coefficients of friction between box and floor are 0 15 and 0 10 The truck stops at a stop sign and then starts to move with an acceleration of 2 m s2 If the box is 2 2 m from the rear of the truck when the truck starts how much time elapses before the box falls off the rear of the truck How far does the truck travel in this time

Choose true or false for each statement regarding the sign conventions for mirrors Real images appear in front of a mirror and have a positive value for the image distance Real images appear in front of a mirror and have a negative value for the image distance Virtual images appear appear behind a mirror and have a negative value for the image distance Submit Answer Tries 0 2

I Doublet of sodium A II Wavelength corresponding to temperature associated with B the isotropic radiation filling all space Wavelength emitted by atomic hydrogen in interstellar C space Wavelength of radiation arising from two close energy D levels in hydrogen IV A 1 A 11 B III C IV C B 1 A 11 B III B IV C C 1 B II A III D IV A A IV B D an DIDY Visible radiation Microwave Short radiowave X rays 2014

A long straight wire is carrying a current of 2A A rectangular loop of length 1 cm and breadth 10 cm carrying a current of 1A is placed from the wire as shown in figure The net force on the rectangular loop is 2A B 2 cm 1A 10 cm c 15 cm A 25 X 107 N towards wire B 25 x 107 N away from wire C 35 x 10 7 N towards wire D 35 x 10 7 N away from wire

E TARGET PRE MEDIC Fig shows a plane mirror onto which a light ray is incident If the incidenting light ray is turned by 10 and the mirror by 20 as shown then the angle turned by the reflected ray is CAREER DISTITUTE ROTA THAMETHANE 10 30 1 30 clockwise 2 200 reflected ray 777 20 2 30 anticlock wise con antic

A plane electromagnetic wave in a non magnetic dielectric medium is given by E E 4 10 7x 50t with distance being in meter and time in seconds The dielectric constant of the medium is A 2 4 2013 C 8 2 B 5 8 D 4 8

3 32 4 34 What is the number of images of an object formed by two mirrors if the angle between the mirrors is in between 2n 4 and 2n 5 1 10 3 6 2 8 4 4

GET PRE MEDICAL 2021 NEET LEADER PHASE IV INTENAL light ray is ned by 10 the angle TEST 01 07 10 2020 A plane mirror is inclined at an angle with the horizontal If a ray of light is incident at an angle 0 then the reflected ray makes the following angle with the horizontal 1 0 2 0 2 20

Two plane mirrors A and B are aligned parallel to each other as shown in the figure A light ray is incident at an angle of 30 at a point just inside one end of A The plane of incidence coincides with the plane of the figure The maximum number of time the ray undergoes reflections including the first one before it emerges out is 0 2m 1 28 2 3m 2 30 A B 2 3 elegram neetquestion paper

A small block of mass m is allowed to slide from h 2r on an inclined frictionless track in vertical plane from rest position as shown in the figure Find total acceleration of block at point Ci B

For each question enter the correct numerical value in decimal notation truncated rou Answer to each question will be evaluated according to the following marking scheme Full Marks 4 If ONLY the correct numerical value is entered as answer Zero Marks 0 In all other cases A charged particle having charge q experience a force F q 1 2k N in a magnetic field B when it has velocity 11 m s The force becomes F2 q 1 2k N when the velocity is changed to 11 m s Find the magnitude magnetic field at this point

A piece of marble is projected from earth s surface with velocity of 25 m s 2 seconds later it just clears a wall 5 m high What is the angle of projection in degree Backspace

If p and q are distance of object and real image from the principal focus of a concave mirror then the apeticion between p q and fis pq f 3 pq f 2 pq f 4 f

556 A rod of mass m and length is held vertically on a smooth horizontal floor Now it is released from this position find the speed of its centre of mass when it makes an angle with the vertical 3gL 1 Simo Ans 0 6g sin cose 2 1 3 sin 0 11

Heater of an electric kettle is made of a wire of length L and diameter d It takes 9 minutes to raise the temperature of 0 5 kg water by 50 k this heater is replaced by a new heater having two wires of same material each of length L Diameter of two wires are 2d and 2d If the two wires are connected in parallel how much time in minutes will it take to raise the temperature of 0 5 kg by 50 k

spring balance is attached to the ceiling of a lift A man hangs his bag on the spring and the spring reads 49 N when the lift is stationary If the lift moves downward with an acceleration of 5 mis the reading of the spring alance in N will be g 9 8 m s 1

le 14 Find the magnetic field at the centre of the circular loop shown in figure Dmy m V on Magnetic field at the point O due to infinite wire is Mol 2 R Magnetic field at the point O due to circulaf loop is Moi 2R fold M out of the plane V into the plane M M 1 Moi 1

The electric field a distance from the axis of a cylindrically symmetric charge distribution in vacuum of infinite length and uniform charge per unit length is 1 22 46 r a c 1 21 Ane OB O D b d 12 4m r 1 A 4neo7

Two identical containers kept at the same temperature carry the same gas with different molecular mean free paths 11 and 12 the gas from the first container is completely transferred in to the second container at the same temperature What is the molecular resultant mean free path in the second container

A circus joker throws vertically three balls one after another with an interval of 0 5 s After 0 5 s of throwing the third ball he catches the first ball When he catches the first ball then A the height of second ball is 2 5 m B the velocity of second ball is 2 5 ms in upward direction C the height of third ball is 2 5 m D the velocity of third ball is 2 5 ms in downward direction

25 N force is applied to the block as shown in figure Choose the correct option s if initial velocity of block is zero Normal contact force is 20N Friction force is 5N Friction force is 10N Block is in equilibrium 37 2kg 25N s 0 5 0 4

Ball A is projected from tower of height 30 m and B is projected horizontally at 6 m s A and B collide in air If separation between the towers is d 10x What is the value of x 30 m s 30ml 53 6 m s 60m

600 nm and2 b Newton s rings are formed with a source of light containing two wavelengths 450 nm It is founded that mth dark ring due to coincides with the m 1 th dark fringe of A2 If the radius of curvature of the curved surface is 90 cm find the diameter of mth dark ring of A 5 5

The ammeter reading in the following circuit will be 1 2 652 wwwww C 292 wwwww Question Type Single Correct Type 652 wwwww 692 8 A 2V 314 4 A

When we place PLC programming such that it gives warning wher room s lights off out of 4 rooms and light controlling unit should gi warning then what is expression ACD ABD ABC BCD OAB BC AD AC ABC AB BC CD AC AD BD ABCD

Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror and parallel to the second is reflected from the seconc mirror parallel to the first mirror Determine the angle between the two mirrors 1 60 3 90 2 30 4 180

A horizontal piston cylinder arrangement encloses a gas at a pressure Po The atmospheric pressure is also Po Now a particle of mass m strikes the piston of identical mass m with a horizontal speed u and sticks to it Subsequently the piston moves without friction and compresses the gas The process of compression can be assumed to be adiabatic In this Po m process A when the piston comes to rest at maximum compression the internal energy of gas would 1 have increased by mu 4 B During the time interval starting from the mass striking the piston to the maximum compression of the enclosed gas the work done by the gas is mu When the piston comes to rest after compressing the gas the internal energy of the gas would have increased by the amount more than mu 4 D During the compression of the gas till the time when piston comes to rest work done by the gas is less than mu 4

Performance of PLC decreases with A Increase in Temperature B Decrease in Temperature C Increase in Vibration D Decrease in Vibration Both A and C Only B Only A Both A and B Solve the following Ladder Diagram Q

A charged particle enters a uniform magnetic field initially travelling perpendicular to the field lines and is bent in a circular arc of radius R If the particle had the same charge but double the mass and were travelling twice as fast the radius of its circular arc would be A 2R B 4R C R D R A B O C O D

Random Access Memory is a type of volatile memory in which data is lost as it is powered off then speed of volatile memory is Faster than non volatile memory Slower than non volatile memory Equal to non volatile memory None of these

following circuit D are ideal diodes then the value of and are respectively 10 V 2kQ w 1 Zero Zero 3 5 mA Zero D 12 kn ww 7 D 2 5 mA 5 mA 4 Zero 5 mA

e 12 A current carrying conductor of length I is bent into two loops one by one First loop has one turn of wire and the second loop has two turns of wire Compare the magnetic fields at the centre of the loops 1 In first Case 2 r At centre B B B 2r 12 B 4B Mol 20 4 In second case 2 x 2 r r 12 B 2x oi 212 there are 2 turns M centre of the loop Moi 2h Ti

A string of length 50 cm and mass 2 5 g is fixed at both ends A pipe closed at one end has a length of 85 cm When the string vibrates in its second overtone and the air column in the pipe in its first overtone they produce a beats frequency of 6 Hz It is also observed that decreasing the tension in the string decreases beats frequency Neglect the end correction in the pipe and velocity of sound in air is 340 m s then the tension in the string is A 72 N C 26 N B 52 N D 18 N

A log of wood floats in water with 1 of its 4 volume above the surface What is the density of wood Question Type Single Correct Type 1 750 gm cc 2 750 kg m3 3 250 gm cc 4 250 kg m3

A conductor carrying a current I has three seg ments as shown What is the magnetic field B at the centre of curvature C of the semicircle A C Ho I 4T R Ho I 4 R 1 TIL B C D Mo I 4 R R Hol 4 1 TLA 1

3 64 The basket in a front loading automatic clothes dryer rotates about a horizontal axis The basket rotates so that the force exerted by the basket on clothes located at the basket s edge is zero at the top of the path If the radius of the basket is 0 65 m how fast must the basket turn to accomplish this

Young s double slit experiment a point source is placed on a solid slab of refractive index 6 5 at a distance of 2 mm from two slits spaced 3 mm apart as shown and at equal distance from both the slits The screen is at a distance of I m from the slits Wavelength of light used is 500 nm K S 2 mm 26 l 6 5 3 mm The central maxima is at 6 The central maxima is at 1 Im m below O m below O 600 The order of the fringe formed at O is 750 B If a film of refractive index 1 8 is to be placed in front of S so that central maxima is formed where 200th maxima was formed Then the thickness of film is 1

The 10 F capacitor was initially charged by a battery After the switches are closed the potential difference across the 10 F capacitor is found to be 15V Find the emf of the battery A 37 5 V B 24 V C 22 5 V D 21 V 20 F 5 F

01 02 03 04 05 06 07 08 09 10 English Review Q A body of mass M and moving with velocity u makes a head on elastic collision with another stationary body of m If A m M then the ratio f of the loss of energy of M to its initial energy will be Question Type Single Correct Type 1 f A A 1 2 3 A 1 UA A 1 4A A 1

Question which formula should we apply for such kind of questions Please explain the solution for following Questi on and even tell what is limit of resolution and concepts r elated to that topic Thank you Have a great day ahead A person standing at a distance of 3 6 km can just resolve two pole The distance between the poles is if eye limit of resolution rad 1 3600 1 m 10 m 0 4 m 5m

A A rigid body is rolling without slipping on the horizontal surface B C D 1 2 3 4 Column 1 Velocity at point A i e VA Velocity at point B i e VB Velocity at point Ci e Vc Velocity at point D i e VD ANI4 2 1 2 B 813 3 3 C5 4 4 2 4 1 2 Column II 3 D3 2 1 1 v 2 4 2v English Zero Q Revie Question Type Single Correct Type

Two point charges of 0 1mc and 0 05m c are kept at points A 2m 0 0 B 2m 0 0 respectively Calculate the electros tatic potential energy of the system if t he whole system is placed in a region o f electric field E C r 2 where C 7 5x1 0 5 N C and r is distance of a point fro m origin 0 0 0

Semiconductor A Zener diode having Zener voltage equal to 10 V is used in a voltage regulator circuit as shown in figure If current through the diode is 2 mA Then value of resistance R is nearly R wwww 3 4 15 V 1 417 Q 3 31202 www 2 600 2 4 810 22 1 kQ So SX400 2 In the question 3 if the value of R is 400 92 then current through the diode nearly 1 5 mA 3 10 mA 2 2 5 mA 4 2 mA

38 A conical container of radius R 1m and height H 5m is filled completely with liquid There a hole at the bottom of container of area x x 10 m see figure Time taken to empty the conica 42 container in sec is t then fill 40 in OMR sheet Take g 10 m s H 4

5 BEATS Beat phenomenon is physically meaningful only if 1 w w w 00 2 w w w 0 3 17 2 4 0 0 2

INTRODUCTORY EXERCISE 7 2 1 A particle is projected from ground with velocity 40 2 m s at 45 Find a velocity and b displacement of the particle after 2 s g 10 m s 2 Under what conditions the formulae of range time of flight and maximum height can be applied directly in case of a projectile motion 3 What is the average velocity of a particle projected from the ground with speed u at an angle a with the horizontal over a time interval from beginning till it strikes the ground again 4 What is the change in velocity in the above question 5 A particle is projected from ground with initial velocity u 20 2 m s at 0 45 Find a R H and T b velocity of particle after 1 s c velocity of particle at the time of collision with the ground x axis 6 A particle is projected from ground at angle 45 with initial velocity 20 2 m s Find a change in velocity b magnitude of average velocity in a time interval from t 0 tot 3 s Fig 7 14 7 The coach throws a baseball to a player with an initial speed of 20 m s at an angle of 45 with the horizontal At the moment the ball is thrown the player is 50 m from the coach At what speed and in what direction must the player run to catch the ball at the same height at which it was released g 10 m s 8 A ball is thrown horizontally from a point 100 m above the ground with a speed of 20 m s Find a the time it takes to reach the ground b the horizontal distance it travels before reaching the ground c the velocity direction and magnitude with which it strikes the ground 9 A bullet fired at an angle of 30 with the horizontal hits the ground 3 0 km away By adjusting its angle of projection can one hope to hit a target 5 0 away Assume the muzzle speed to be fixed and neglect air resistance 10 A particle moves in the xy plane with constant acceleration a directed along the negative y axis The equation of path of the particle has the form y bx cx where b and c are positive constants Find the velocity of the particle at the origin of coordinates

Two long metallic coaxial cylindrical capacitors of radii R and 2R are carrying charges Q and Q respectively T energy of the capacitor is U For what values of the radii the energy of the capacitor will be 2U

In a cyclotron the potential difference of AC source connected across dees is 1000 V An a particle is accelerated in this cyclotron If it completes 200 revolutions then kinetic energy attained by a particle is O 0 2 MeV O 0 4 MeV O 0 8 MeV O 0 3 MeV

exptar why optio 6 For measurement of potential difference potentiometer is preferred in comparison to voltmeter because a potentiometer is more sensitive than voltmeter b the resistance of potentiometer is less than voltmeter c is cheaper than voltmeter potentiometer d potentiometer does not take current from the circuit