Physics Questions

amplitude 2k 3 not perform SHM but will have a periodic motion 4 remain stationary Electric flux through surface area 100 m lying in xy plane if i 2 3k N C in N m C 1 100 2 141 4 3 173 2 4 200 perform 3 4 femm x 100 m 4 2k crea ufani feE 1 2 3k N C N m C 2 141 4 3 173 2 4 200 1 100

PLS PROVIDE STEP WISE SOLUTION WITH REASON Provide ALL Alternative approaches and solutions to the Q A point particle is acted upon by a restoring force kx The time period of oscillation is T when the amplitude is A The time period for an amplitude 2A will be A T B T 2 C 2T D 4T

25 A big hollow metal sphere A is charged to 100 voli and another smaller hollow sphere B is charge to 50 volts If B is put inside A and joined with metallic wire then the direction of charge flow 1 is from A to B 2 is from B to A 3 no charge flows

A body of mass 64 g is made to oscillate turn by turn on two different springs A and B Spring A and B has force constant 4 and 16 respectively If T and T2 N N m m are period of oscillations of springs A and B respectively then A B C 1 3 3 1 1 2 T T T T 2 1 will be

59 A body Potential has equation a V x y xy Find its kind of Motion after Releasing it from Rest from 1 2 1 2 A Const Acc q m B Circular Motion with Acc q m C Const Retardation of q m mais AT X with Ace of alm

A particle has the wave function y x t A exp iwt cos kx Which one of the following is correct a This is an eigenstate of both energy and momentum b This is an eigenstate of momentum and not energy c This is an eigenstate of energy and not momentum d This is not an eigenstate of energy of momentum

A current flows in a long straight wire with cross section having the form of a thin quarter ring of radius R see figure The magnetic field B at point O if the current flows out of the page is L 1 Hol R R 1 1 3 i 1 Hol T 2R 2 1 Mol T R 4 Hol T R 1 1

1 r has its centre at the origin of the coordinate system in a magnetic field of induction B When it is rotated about y axis through 90 the net charge flown in the loop is directly proportional to y 1 R 1 2 2 2 R

horizontal A compass needle is taken to magnetic equator The needle is allowed to move in horizontal plane the needle will stay 1 Along magnetic east west direction 2 Along magnetic north south direction 3 In any direction it is released vertical

Suppose the potential energy between a proton and an ke electron is given by U ke where r is the separation between the two Then the radius of the nth Bohr s orbit is proportional to Only one correct answer A n B 1 12 C n D 1 MA

A particle of mass m is moving in a potential of the form V x y z 1 2 mw 3x 3y 2z 2xy The oscillation frequencies of the three normal modes of the particle are given by b 20 30 and 300 d 2w 20 and 2w a w 3w and w c 2w 2w and 2w

1 3A www 302 9V Find reading of ammeter in given circuit 2 6A 4 4 5A 3 1 5A www 352 at Course Il 151 www 302 www 302 9V 1 3A 3 1 5A ww 100 www 302 2 6A 4 4 5A ER 1001CMDY

Two particles A and B have same charge q and different masses m and 2m respectively They are released from rest with initial separation d between them Assuming only mutual electrostatic forces act on them the speed o B when the separation between them becomes 2d is 9 8 md 9 24 md 2q 37 md 9

When a mass m is suspended from a spring of length e the length of the spring becomes L The mass is pulled down by a distance d and released If the equation of motion of the mass is P x 0 then P is equal to dt g acceleration due to gravity L l A B C g g L l g L l L l

llic bob of mass m and charge Q is in equilibrium in the presence of electric repulsion by a fixed charge Q as shown in the figure Find the value of Q In 1 2 mg L 1 3 8 mg L 1 1 1 1 Q 60 L 2 4 mg L 4 None of these

A parallel plate capacitor formed by square plates of sid length separated by a distance d d is filled with a material whose dielectric constant varies linearly from K to 2K along x The capacitance of the capacitor with the dielectric medium will be X O EK1 d O EK1 2d O 3 K1 2d

fixed nucleus XA is 8 MeV It absorbs a neutron moving with kinetic energy K E 4 MeV and converts into Y Emitting a photon of energy 2 MeV The binding energy per nucleon of Y in MeV is Only one correct answer A B C D 8A 2 A 1 8A 2 A 1 8A 1 A 1 8 A A 1 i

1 A dip needle in plane perpendicular to magnetic meridian excep magnetic equator will remain 1 Horizontal 2 Vertical 3 At an angle 5 with vertical 4 In any direct on

How can we determine the Thevenin resistance O Shorting all voltage sources O Opening all current sources O Shorting all voltage sources and opening all current sources O Opening all voltage sources and shorting all current sources

In a YDSE d 1 mm 6000 and D 1 m The slits produce same intensity on the screen The minimum distance from central maximum where intensity is 75 of the maximum intensity is Only one correct answer A 0 45 mm B C D 0 40 mm 0 30 mm 0 10 mm

Mark the incorrect statement 1 In any AC circuit the applied instantaneous voltage equals to the algebraic sum of the instantaneous voltages across the series elements of the circuit 2 For circuits used for transporting electric power a low power factor implies large power loss in transmission 3 Power factor can often be improved by the use of a capacitor of appropriate capacitance in the circuit 4 The use of a capacitor is avoided in the circuit of an induction coil LC Oscillations Transformers intor on 220 V line and

A uniformly charged ring of radius 1 0 m has charge Q 5 0 C The magnitude of electric force exerted by the ring on a point charge of 2 0 C kept on its axis at a distance of 3 m from its centre will be O 45 3x10 N O 90 3x10 N 45 3 x 10 N

28 6 The temperature of a cavity of fixed volume is doubled Which of the following is true for the black body radiation inside the cavity a its energy and the number of photons both increase 8 times b its energy increases 8 times and the number of photons increases 16 times c its energy increases 16 times and the number of photons increases 8 times d its energy and the number of photons both increase 16 times a P and Q

0 In the circuit shown the power developed in 40 the 652 resistor is 6W The power developed in the 4 resistor is 1 16 W 3 6 W usiest Course li H 30092020 652 2 9 W 4 4 W 40 1 16 W 3 6 W Space for Rough Work ard for 606 W st 2 9W

ries LC An inductor 20 mH a capacitor 100 F and a resistor 50 2 are connected in series across a source of emf V 10 sin314t The power loss in the circuit is 1867 916 KES NEET 2018 1 0 79 W 2 0 43 W 3 1 13 W 4 2 74 W should be

and d 4 a and b 3 a b c d A circuit when connected to an AC source of when connected to a DC source of 12 V gives a current of 0 4 A The circuit is 1 Series LCR 3 Series RC NEET 2019 Odisha 2 Series LR 4 Series LC

28 The resultant resistance of n wires each of 28 resistance r ohms is R when they are connected in parallel When these n resistances are connected in series the resultant resistance will be 1 R n 3 R 4 n R afe 3 fe 3 R 4 n R

1 1 2 2 1 4 3 4 1 4 2 1 Three 60W 120V light bulbs are connected 39 across a 120 V power source If resistance of each bulb does not change with current then find out total power delivered to the three bulbs 120V 1 180 W 2 20 W In the circuit shown 3 40 W 4 60 W the power developed in 40 1 1 2 2 1 4 3 4 1 4 2 1 60W 120 Vangen 120 V er et af a falda din a 120V 1 180 W 2 20 W 3 40 W 4 60 W nequestion paper

ALLEN A voltmeter of resistance 100002 gives full scale 33 deflection when a current of 100 mA flow through it The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full scale deflection is 1 10000 2 3 222 2 A galvanometer has a resistance of 36630 A 34 2 9000 2 4 1110 10000 a 100 mA qui a fait M 1 10000 2 3 222 02 f 2 9000 Q 4 1110 ada 36630

Two point charges Q and 20 are fixed on 13 after far the X axis at positions a and 2a from origin respectively At what positions on the axis the sh a de 2a feffer for fearf resultant electric field is zero kun faga 1 Only x 2a 3 Both x tv 2a 2 Only x 2a 3a 4 X only 2 1 de 3 1x 2a 1x 2a 2a 2 andel X 1 3a 4 x andel

In the path of a beam converging towards a point on screen a glass plate of thickness tis placed The convergence point will shift by refractive index of material of slab Only one correct answer A t B t c t 2 1 20 C

A dip circle is taken to a magnetic pole Initially it was in vertical direction If dip circle is now turned by 90 in a vertical plane the needle will 1 Stay in horizontal direction 2 Stay in vertical direction 3 Can stay in any direction it is released 4 Can stay in any direction except vertical or horizontal

4 In a legend the hero kid kicked a toy pig so that it is projected with a speed greater than that of its cry If the weight of the toy pig is assumed to be 5 kg and the time of contact 0 01 sec the force with which the hero kid kicked him was Speed of cry 330 m s

At 1 0 a radioactive substance has a mass m Its half life is 10 minutes When 1 1 the amount substance disintegrated is m 5 and when t 12 the amount of substance disintegrated is 3m 5 Then the time interval 1 1 is 1 10 minutes 2 20 minutes 3 5 minutes 4 7 minutes

Two coaxial dipoles of dipole moments p and p are separated by a distance r The magnitude of electric force on p due to p is k 1 3 2kp P 7 3 6kp P 4 4 none of these r 4 2 2kp p j 4 zero arn

A parallel beam of electrons of a given momentum pass through a screen S containing a slit and then produces a diffraction pattern on a screen S placed behind it The width of the central maximum observed on the screen S can be increased by 2 a decreasing the distance between the screens S and S b increasing the width of the slit in screen S c decreasing the momentum of the electrons d increasing the momentum of the electrons

In the circuit shown in figure 50 www 40 30 ALLEN 41 40V 1 Power supplied by battery is 200W 2 Current in wire AB is zero 3 Potential difference across 502 resistance is same as potential difference across 302 resistance 4 Current flowing in circuit is 5A A 3 volt battery with negligible internal 42 faangen afrua feen v 1 2 AB 3 5 3 40 az A B 30 40V 200 and a t 4 SA RI fark

Two coherent light sources each of wavelength A are separated by distance 3A The total number of minima observed on the line AB which runs from to o is P 3 Only one correct answer A 2 B 4 C 6 0 B 8

5 The distance between a town and a bus stop is 30 km A man started to walk from the bus stop to the town at 7 30 a m while a cyclist left the town for the bus stop at 7 40 a m riding at a speed of 18 km h The man met the cyclist after walking 6 km determine at what time they met and the man s speed 1 9 a m 6 km h 2 9 a m 4 km h LAY 16

A disc is given an initial angular velocity wo and is placed on rough horizontal surface as shown The quantities which will not depend on the co efficient of friction is are Question Type Multiple Correct Type 1 2 3 0 4 The time until pure rolling begins The displacement of the disc until pure rolling begins The velocity when pure rolling begins The work done by the force of frictic

A charged particle having charge 2 C is projected with velocity 21 33 m s inside a region having E 23 N C and B acting on the particle in newtons Only one correct answer A B 30i 16j C 30i 16j D 30i 16j 5 T Find the Lorentz force G

3 A uniform rectangular plate has been bent as shown in the figure The two angled parts of the plate are of identical size The moment of inertia of the bent plate about axis xx is I Find its moment of inertia about an axis parallel to xx and passing through the centre of mass of the plate D E 60 B C b

31 For the reaction N 05 g 2NO2 O2 the rate of 2 g g 1 S disappearance of N O5 is 6 25 x 10 mol L s The rate of formation of NO2 and O2 will be respectively AIPMT 2010 a 6 25 x 10 3 mol L s and 6 25 x 10 mol L s S b 1 25x10 2 mol L s and 3 125 x 10 3 mol L s 1 S 1 S c 6 25 x 10 3 mol Ls and 3 125 x 103 mol L s d 1 25x10 2 mol Ls and 6 25 x 10 mol L s

38 A linear charge having linear charge density penetra a cube diagonally and then it penetrates a sph diametrically as shown What will be the ratio of fi coming out of cube to that from sphere pove 2 3

50 From NCERT NEET 2016 A black body is at a temperature of 5760 K The energy of radiation emitted by the body at wavelength 250 nm is U at wavelength 500nm is U and that at 1000nm is U3 Given Wien s constant b 2 88 x 106 nm K Which of the following is correct 1 U3 0 2 U1 U 3 U U 4 U 0

In the circuit of adjoining figure the current through 1202 resister will be 1 1 A 3 2 5 E A 502 5V 10022 1202 wwww 552 5V H A 4 0 A Telegram ne question 1 1A 3 A 120 13 E 5V 1002 1202 www 2 552 5V 4 0 A F

Calculate the acceleration of the block and trolly system shown in the figure The coefficient of kinetic friction between the trolly and the surface is 0 05 g 10 m s mass of the string is negligible and no other friction exists Trolly 10 kg O O 1 1 00 m s 2 1 25 m s 3 1 50 m s 4 1 66 m s 2 kg Block

58 A diverging lens of focal length 10 cm is placed 10 cm in front of a plane mirror as shown in the figure Light from a very far away source falls on the lens The final image is at a distance 10 cm 10 cm R fra fafata 1 20 cm behind the mirror 3 7 5 cm behind the mirror 1 20 cm 3 7 5 cm 2 7 5 cm in front of the mirror 4 2 5 cm in front of the mirror 7 5 cm 2 4 2 5 cm

The two vectors A and B that are parallel to each other are 1 3 6 9k 2 3 6 9k 3 2 6 9k 4 A 21 31 3k B 2 3k B 1 2 3k B 2 3k B i 21 3k

1 50 W 3 200 14 4 400 W 22 A capacitor of capacitance 1 F is charged to a potential of 1 V It is connected in parallel to an inductor of inductance 10 3 H The maximum current that will flow in the circuit has the value 1000 mA X 1 A 4 1000 mA ancillating L C circuit the maximum charge on the capacitor is Q The charge on the capacitor wh the electric and magnetic field is 1 3 on 2 1 mA