Physics Questions

of 10 m s in a direction 45 from the horizontal y direction on the smooth inclined plane Calculate the magnitude v of its velocity in m s after 2 seconds Take g 10 m s 10m s 45 y 45 X

If the angular dispersion produced by a prism is e for a wavelength 4000 then the angular dispersion for a wavelength 8000 may be A O e O 0 O O 8 38

214 Electrons in a conductor are moving randomely due to thermal energy this making it s average velocity zerc and thus displacement On applying external electrical field they start moving with drift velocity i Obtain relation for drift velocity on the basis of given information ii From the result of drift velocity define relaxation time 3 1

Computer X can communicate with computer Y by using DNS protocol and at the same time X communicate with computer Z by using SMTP for this process which addressing is used O Port addressing O Logical addressing O process addressing O Physical addressing 4

Mark the responsibility of network Layer You can select multiple correct answers Responsible for the source to destination delivery of individual packet from source host to the destination host Responsible for moving frames from one hop to the next Responsible for route or switch the packets to the final destination Responsible for the delivery of a message from one process to another

A bi convex thin lens of glass focal length in air is 20 cm Now one of its convex face is silvered to make equivalen mirror In case i this equivalent mirror is kep in air and in case ii it is kept in wate 4 3 Then A B ha Radius of curvature of convex side of lens is 10 cm Focal length of equivalent mirror in both case is same C Focal length in case i is 5 cm D Focal length in case ii is 8 cm

For ground to ground projectile time taken b a particle to go from point O to point C is and during the same motion time taken by t particle to go from A to B is T2 then height is y A h E A 8T gT 2 C T 1 B F h C B g T T 3 D T T

Identify the correct statements about Routers You can select multiple correc answers Router is internetworking device and internet uses routers to connect LANs and WANS Router is three layer device that routes packets based on switching table Router makes routing tables are normally dynamic and are updated using routing protocols Routers are based on their physical addresses for host to host delivery

A network with bandwidth of 10 Mbps can pass only an average of 24 000 frames per minute with each frame carrying capacity an average of 10 000 bits What is throughput of network O 12 Mbps 3 Mbps

The figure shows the velocity and acceleration of a point like body at the initial moment of its motion The acceleration remains constant Given a 10 m s vo 30 m s 0 127 a A Speed will be minimum at t 1 8 sec B Speed will be minimum at t 5 sec Speed will be minimum when C acceleration velocity are perpendicular to each other D Minimum speed will be zero 0

Performance of a network is depends on OI O port connected to network Reliability and security O number of users types of transmission medium capabilities of the connect hardware Dedicated links carries traffic only

When 2000 ohm load is connected across a 20 mA current source it is fou that18 mA flows in the load What is the internal resistance of the source O 3000 ohm O 6000 ohm O 12000 ohm O18000 ohm

10 a Complete the sentences with words that describe the main process of thermal energy transfer in each case A man goes for a walk on a cold day He touches a metal gate which removes thermal energy from his hands by He holds the sides of a cup containing a hot drink His hands gain thermal energy by lit a fire The man warms his hands by the side of the fire His hands gain thermal energy by 3 b Describe in terms of particles the transfer of thermal energy through the metal of the gate after transfer from the man s hands Some farm workers have

concave mirror forms the image of an object kept at 15 cm from its pole twice in size and real Where should the object be kept so that a virtual mage of twice the size of object is formed O 10 cm from pole O 5 cm from pole O3 cm from pole O 8 cm from pole

14012 In the circuit shown the variable resistance is so 32 adjusted that the ammeter reading is same in both the position 1 and 2 of the key The reading of ammeter is 2A If E 10V then x is His E Ideal 1 20 2 502 3 100 R TEST SERIES JOINT PACKAGE COURSE 4 200 3 1180 vakia fa ukanda 2A1E 10V Hw 1 20 Ideal 2 50 4 140 0 E 12fefani X 3 1002 4 2002 09990MD31032000

4 The figure shows a pipe of uniform cross section inclined in a vertical plane A U tube manometer is connected between the points A and B If the liquid of density po flows with velocity vo in the pipe Then the reading h of the manometer is a h 0 c h Po Vo p 2g b h vo 2g d h POH P Po

A particle moves with constant speed v along a parabolic path y kx Where k is a positive constant Which of the following is are correct A x component of velocity at origin is zero B y component of velocity at origin is zero C Acceleration of particle at origin is 2kv D Acceleration of particle at origin is zero

A ball is dropped from an upper floor some unknown distance above Tom s apartment As he looks out of his window which is 1 90 m tall Tom observes that it takes the ball 0 140 s to traverse the length of the window Determine how high h above the top of Tom s window the ball was dropped Ignore the effects of air resistance

In the circuit shown in figure Select the correct option s A current passing through 2 2 resistance is zero B current passing through 4 2 resistance is 5 A C current passing through 5 2 resistance is 4 A D all of the above ww 40 202 www 20V www 542

b who le to a 20 volt potential The and pure 40 mH coil is so that LC oscillations are e coil is JEE Main Online 2018 10 mA 4A tal wire are lying on a oop A carries a current e the loop B 1999 UPSEAT 2003 05 H The current region a Is zero b Decreases as c Increases as r d Decreases as 1 r 1 2 X X X X Y X le centre of the cir IIT JEE Screening 2 X X B t X X X 2 Xx X XX Pens loops se closed a clockwise an induced current closed for a long ti flows in Q Then th E are A coil of wire having finite inductance and resistance ha conducting ring placed coaxially within it The col connected to a battery at time t 0 so that a time depende current starts flowing through the coil If It is s current induced in the ring and B t is the magnetic field a the axis of the coil due to 1 t then as a function of t 0 the product 1 t B t IIT JEE Screening 2000 a Increases with time b Decreases with time c Does not vary with time d Passes through a maximum 1 Two circular coils can be arranged in any of the three situations shown in the figure Their mutual inductance will be IIT JEE Screening 2001 Batter a Respectiv b Both cloc c Both ant d Respect

Potential difference across the terminals of a non ideal battery is A zero when it is short circuited B less than its emf when current flows from negative terminal to positive terminal inside the battery C zero when no current is drawn from the battery D greater than its emf when current flows from positive terminal to negative terminal inside the

A particle is projected up on incline at t 0 with speed 14 m s as shown in the figure At the same moment a box starts sliding down the box has 2 small hole at height of 2m on opposite walls The particle enters from 1st window and leaves through the other The width of the box is Assume friction to be absent everywhere 14m s 2m 1302 153 2m

A coin is released inside a lift at a height of m from the floor of the lift The height of th lift is 10 m The lift is moving with a acceleration of 9 m s downwards The tim after which the coin will strike with the floor lift is g 10 m s A 4s 4 C S 21 B 2s D 2 11 S

An object and a screen are kept at a distance 120 cm A lens of focal length 22 5 cm is ke between them so that a real image is formed the screen Find the possible location s of t lens A 90cm from object B 30cm from object C 40cm from object D 80cm from object

A particle has a rectilinear motion and the figure gives its displacement as a function of time Which of the following statements are true with respect to the motion B C X D A B in the motion between O and A the A velocity is positive and acceleration is negative C A between A and B the velocity and acceleration are positive t between B and C the velocity is negative and acceleration is positive between C and D the acceleration is positive

The potential drop across the 302 resistor is 30 1 IV 3 2 V 402 3V 602 2 1 5 V 4 3 V USR ER TEST SERIES JOINT PACKAGE COURSE Page 8 44 29 1 4R 1 IV 3 2 V 2 2R 3 R 4 0 5R fada funda fare Space for Rough Work day ITE 607 3V 2 15 V 4 3 V 09990MD310320002 NEET UG 2021 19072020

10 Q2 A planet of radius R radius of Earth has the same mass density as Earth Scientists dig well of depth on it and lower a wire of the same length and of linear mass density 10 3 kg m into it If the wire is not touching anywhere the force applied at the top of the wire by a person holding it in place is take the radius of Earth 6 x 106 m and the acceleration due to gravity on Earth 10 m s 2014 A 96 N B 108 N C 120 N D 150 N

In the circuit shown in the figure the input voltage V is 20 V VE 0 and VCE 0 The values of Ig Ic and are given by BE NEET 2018 V RB www 500 kg B 20 V Rc34 ko C C TE 1 B 40 A Ic 10 mA 250 2 B 25 A Ic 5 mA 200 3 40 A Ic 5 mA 125 B 4 L 20 A I 5 mA 250

A car travelling at 60 km h overtakes another car travelling at 42 km h Assuming each car to be 5 0 m long find the time taken during the overtake and the total road distance used for the overtake

Three blocks A B and C of masses 3 kg 2 kg and 4 kg respectively are hanging on a string passing over a fixed frictionless pulley as shown in the figure Tension in the string connecting block B and C is 1 3 2g 3 4g 3 A B 2 4 8g 3 6g 3 Enthusiast Le

A Electromagnetic force Gravitational force C Strong nuclear force Gravitational force Which pair does not have equal dimensions A Torque and Energy B Strong nuclear force Weak nuclea D Strong nuclear force Electromagn B Force and impulse D Elastic modulus and pressure C Angular momentum and planck s constant The surface area of a solid sphere of radius 3 cm is mm

In the figure the circular loop has a current as shown When the current is switched on in the straight line conductor the loop will A be attracted towards the wire B be repelled by the wire C remain stationary bout avio morallel to the in

constant electric field of intensity E and a magnetic field of induction B coexist an electron projected with speed v in the positive x direction moves undeviated without change in speed In addition an electron projected with velocity in the positive y direction in this region also moves undeviated without change in speed Which of the following conclusions can you make a v B 6 v B The electric field is perpendicular to the x y plane The magnetic field is either at 45 or 135 with the positive x

Fig 4 1 shows a Galilean thermometer This thermometer is used to measure the approximate temperature of the surrounding air glass cylinder water entia bulb E label 28 C bulb D label 26 C bulb C label 24 C bulb B label 22 C bulb A label 20 C Fig 4 1 The glass cylinder contains water When the temperature of the water changes so does its density Each bulb has a label printed with a temperature as shown in Fig 4 1 The bulbs have different densities At 21 C only bulb A is at the bottom of the cylinder a Explain in terms of density why bulb A is at the bottom of the cylinder and the other bulbs are floating

A particle of mass m moving with velocity vo on smooth surface collides elastically with uniform rod 4m 1 and comes to rest immediately Velocity of end A just after collision is m B Vo 3 Vo 2

A uniform solid sphere rolls up without slipping the rough fixed inclined plane and then back down Which is the correct graph of acceleration a of centre of mass of solid sphere as function of time t for the duration sphere is on the incline Assume that the sphere rolling up has a positive velocity Question Type Single Correct Type 1 F 2 3 BE

block of mass M is placed on the top of bigger block of mass 10 M as shown in gure All the surfaces are frictionless The system is released from rest then ne distance moved by the bigger block t the instant the smaller block reaches the ground a 0 22 m c zero b 0 20 m d 0 24 m 10M 2 2m

A battery of emf E and internal resistance r is connected across a resistance R Resistance R can be adjusted to any value greater than or equal to zero A graph is plotted between the current passing through the resistance i and potential difference V across it Select the correct alternative s A Internal resistance of the battery is 50 B Emf of the battery is 10 V C Maximum current which can be taken from the battery is 2 A D V I graph can never be a straight line as shown in figure Volt 10 amper

Three resistors are in parallel The current in the first resistor is 0 5 A The power dissipated in the second is 15 watts The voltage across the third is 200 volts Determine total resistance of circuit if total current is 1 A O 100 ohm O 200 ohm 300 ohm 400 ohm

A concave mirror is kept as shown in figure Its principal axis coincides with the x axis A real object is moving towards the pole of the mirror starting from the o In which region image will never form P Question Type Single Correct Type 1 Between o and C 2 Between C and F 3 Between F and P X 4 Between P and o

3 A tuning fork with frequency 800 Hz produces resonance in a resonance column tube with upper end open and lower end closed by water surface Successive resonance are observed at length 9 75 cm 31 25 cm and 52 75 cm The speed of sound in air is a 500 m s b 156 m s c 344 m s d 172 m s Odisha NEET 2019 4 A tuning fork is used to produce resonance in a glass tube The length of the air column in this tube can be adjusted by a variable piston At room temperature of 27 C two successive resonances are produced at 20 cm and 73 cm of column length If the frequency of the tuning fork is 320 Hz the velocity of sound in air at 27 C is a 330 m s c 350 m s b 339 m s d 300 m s NEET 2018

A closed rectangular tank is completely filled with water and is accelerated horizontally with an acceleration towards right Pressure is i maximum at and ii minimum at B Question Type Single Correct Type i B ii D 2 i C ii D 4 3 i B ii C D i B ii A a

Resistance of a wire at temperature t C is R Ro 1 at bt Here R is the temperature at 0 C The temperature coefficient of resistance at temperature tis a 2bt A B a 2bt C 1 at bt D constant 1 at bt a 2bt

A wedge of mass M is kept on a smooth inclined plane in figure along with a block of mass m placed inside the wedge Block is free to move inside groove of the wedge Neglect friction between all the surfaces System is released from rest Mark the CORRECT option Block m Wedge M A Contact force between block and wedge is non zero B Acceleration of block is g sin 0 C Acceleration of wedge is greater than g sin 0 D Resultant acceleration of block is vertically downward

b Fig 3 1 shows a boat that has been lifted out of a river The boat is suspended by two ropes It is stationary Tif ii C the tension Fig 3 1 not to scale The weight of the boat acting at the centre of mass is 24 kN The tensions in the ropes are T and T Determine iii the tension To 1 20m 0 40m 24 KN i the moment of the weight of the boat about the point P P moment T 13

A wire of length 100cm carries a steady current i The potentials at the ends of the wire is 5V and 25V The value of potential at x 30cm is A 6 5 V 5 x 130 cm B 11 V 25 100 cm C 3 5 V D 4 V

stration 7 Two charges each of magnitude Q are fixed at 2a distance apart A third charge q of mass m is placed at the mid point of the two charges now q charge is slightly displaced perpendicular to the line joining the charges then find its time period

The extension load graph for a spring is shown The unstretched length of the spring is 17 0cm A extension cm 1 4 N 3 2 1 0 0 1 N C 2 6N 2 When an object is suspended from the spring the length of the spring is 19 2 cm What is the weight of the object B 1 6 N 3 load N D 3 0N

carrying a current I The radius of the innermost and outermost turns see figure are a and 4a respectively The expression for the magnetic moment of the spiral is et O 3 Nla a

There are two sources of light each emitting with power of 100 W One emits X rays of wavelength 1 nm and other visible light at 500 nm What is ratio of number of photons of X rays to photons of visible light of given wavelength O 200 300 400 500