Physics Questions

L ms in the plane of the table collide with the two ends of the rod simultaneously as shown in the figure The marbles stuck to the rod and continue to move with the rod Time taken by the rod to rotate through an angle radian is in seconds M agos L sne a Deo 55 0 55rodowy 56 M 6 de L ms 2560 586 od r5 Doom s dod 550 650 v sznon sjetin sadjon I d ng s min ahmo domnum s e sus SO 0 Options 1 1 2 2 T od do 1050 206 157 5 por ter od Jora New 3 T Rod 5

During an a particle decay from a nuclei at rest of atomic mass 284 the wavelength of the wave associated with the a particle is X Then the wavelength of the wave associated with the daughter nuclei must be Only one correct answer A A B C 2A 6

A small body a starts sliding from the height h down an inclined groove passing into a half circle of radius h 2 Assuming the friction to be negligible find the velocity of the body at the highest point of its trajectory after breaking off the groove A A 9 gh h BT 8 gh C 27 gh h 2 D 10 27 gh

A cubical block of side a is placed on the ground A particle is projected from ground with minimum velocity vo such that it crosses over the cube as shown Then B 181 Vo 3ga Vo 5ga 8 cos 1 3 3

A particle having mass mand charge qis projected into a region having perpendicular magnetic field as shown If the width of the field d mv 29B then the deviation of charge particle as it comes out of field is Only one correct answer A 0 12 B 8 C D 0 e p

Figure shows an ideal spring block system force constant of spring is k which has been compressed by an amount Xo If x is instantaneous deflection of spring from its natural length mark the correct options vooooo m Smooth A Instantaneous power delivered by spring is k kx 2 x x 2m

118 A galvanometer of resistance 99 2 requires 5 mA current for full scale deflection It can be converted into an ammeter of range 0 5 A by connecting a shunt resistance of 99 02 36 4 de moge rid n Bogin bid wigs Boder 5 m Dog5 x 05 000 0 5 A g s range wszedem arday doserbs ob 606 284 1 19 3 40

A cylindrical solid rod made up of material of refractive index is given A light beam enters from one circular end of the cylinder and comes out just brushing the outer surface along the length What should be the angle of incidence on the circular face F Only one correct answer A sin B sin C sin 1 2 1 1 G

117 A bar magnet of magnetic moment 20 3 T lies aligned with the direction of a uniform magnetic field of 0 25T The amount of work required to turn the magnet so as to align its magnetic moment normal to the field direction is do o 16 015 500 cosom dodog 1 951 2 0 3 J 20 J T 0 25 T 66a czos a 10 20 De 3 5 0 J 4 0 10 J

is instantaneous angle which joining the particle and the centre of the loop makes with the vertical as shown then identify the correct statement s related o the normal reaction N between the block and the surface A The maximum value N occurs at 0 0 B The minimum value of N occurs at 0 m for H C The value of N becomes zero at 0 for all H D Minimum value of H to complete vertical circular motion is to

A thermally insulated cubical box of side length 20 cm and wall thickness 2 cm containing 2 kg of ice is closed on all sides The mass of ice melted in 10 hours is Thermal conductivity of the material of the box 0 01 Wm K latent heat of ice 360x103 J kg and ambient temperature 40 C 508 508 y 30 Jurbed Options 3 4 1 52 kg 1 25 kg 1 64 kg 20 cm 5065 2 cm Ke as goods 40 C 0 48 kg a 10 Kobe 8 So for song 0 01 Wm K 500 500 360 10 J kg 350 52 kg 70 107

a b 1 along x axis 3 along z axis X A semi circular current carrying loop is placed near an infinite straight wire with its section ab parallel to the wire as shown The net magnetic force on the loop is 2 along y axis 4 zero

time as ortional 0 12 4 1296 km 22 The position x of particle moving along x axis varies with time t as x Asin cof where A and are positive constants The acceleration a of particle varies with its position x as 1 a Ax 3 a Amx 2 a 6 x 4 a m YA

53 A short dipole of dipole moment p is placed with axis perpendicular to a long thin uniformly charg rod with linear charge density at a distance r F the force acting on the rod due to field of dipole 1 p 2 EO p 3 r 2 AY p TEO 3 po p

In the figure shown the wavelength and frequency of photons in transition a b and c for hydrogen atoms are a Ab Ac and va V and vc respectively then Only one correct answer A B C Vb Va Vc Vc Va Vb Ve do des dave ne

When a rubber string is stretched through a distance x the restoring force developed has a magnitude px qx x where p q and r are constants Work done in stretching the unstretched rubber string by a distance 7 is as a px qx x 5 p q Kro K535 2005 58 Options p 2 1 3 4 p 3 9 3 x 665 655 Dojo s os p q 1 4 pl q 1 58550 brengen S bado day s 1

article of mass m is released from a height H on a smooth curved surface which ends into a vertical loop of radius R as shown R 0 is instantaneous angle which joining the particle and the centre of the loop makes with the vertical as shown then identify the correct atement s related to the normal reaction N between the block and the surface A The maximum value N occurs at 0 0 B The minimum value of N occurs at 0 for H 5R C The value of N becomes zero at 0 for all H 5R D Minimum value of H to complete vertical circular motion is 3

P 555 55 55 55 ms 56 Vrms 56550 3366 300 mms 5 37 Options 1 3 Vrms Vims 3 3

A car of mass m accelerates on a level smooth road when a constant power p is delivered to it If the velocity of the car at any instant is v then its velocity will be doubled after travelling a distance m r as p Options 1 7mv 3p m r as 5 2 m go Ke 56 p s go aggan Boja D o god so 35 v you oriosos do

4 Its velocity must be constant 13 The position of a particle moving along x axis is given by x 101 21 Then the time at which it will momently come to rest is 1 O 2 2 5 s 4 10 s Tower 8 Pusa Road New Delhi 110005 Ph 011 4762345

Board Competitive Exams Motion in a Straight Line 131 29 Two objects A and B are moving with velocities and va respectively along positive x axis if v V then which of the following position time graphs is correctly showing the velocity of A and 87 3 2 1 M x m K

119 Two concentric coils of 10 turns each are placed in the same plane Their radii are 20 cm and 40 cm and carry 0 2 amp and 0 3 amp current respectively in opposite directions The magnetic induction in Tesla at their centre is 10 de Jos De Bode in gos L dood ades j ad agg 50m 20 cm 565 40 cm 50cargo 56m 0 2 amp 0 0 3 amp bags gads Ato 355 Bod 50 do bon Do E f 2 Po MO

The upper end of the uniform chain of linear mass density u is lowered with a speed v as shown the figure Find the reaction force offered by the ground after the chain falls through a distance y

SolveLancer Test Select correct option after reading given statemnets carefully 1 Ideal gas particles does not obey the Newton s laws of motion ii The viscosity of gases is proportional to the mean free path of the gas molecules iii Forces between molecules are of magnetic origin SolveLancer Test a i and ii both true b 1 only true c ii and iii both true d i ii and iii all true

Current through an inductor is increasing according to 2t du Variation of rate of increment of its energy with time f is correctly shown in the graph Only one correct answer B O 2 36 du dt K du dt 12

A moves with 65 km h while B is coming ba A with 80 km h The relative velocity of B respect to A is A 15 km h C 60 km h A A Correct Not Marked By You B Incorrect Marked By You B 145 km h D 80 km h

White light containing wavelengths from 410 nm to 750 nm falls on a grating with 7700 slits cm T Part A How wide is the first order spectrum on a screen 3 90 m away Express your answer to three significant figures and include the appropriate units 0 HA Value SIMO

The self inductance of solenoid if the space inside it is filled with a material of relative permeability is Symbols have their usual meaning OL A Hy OL H A OL A Ho 14 2 2 3 3m

Your JEE MAIN FULL TEST 18 starts at 10 30 am today It will be available till today midnight 12 o clock You can start the exam anytime before that ALL THE BEST An ice cube is floating in water above which a layer of lighter oil is poured As the ice melts interface and the uppermost level of oil will respectively AP Pesert Ice FIRS und A THE EN Interface A rise and fall B fall and rise C not change and not change

A parallel plate capacitor is connected with a resistance R and a cell of emf e as shown in figure The capacitor is fully charged Keeping the right plate fixed the left plate is moved slowly towards further left with a variable velocity such that the current flowing through the circuit is constant Then the variation of with separation a between the plates is represented by curve Answer A www Your Attempt K 12 Correct answer Rate this question

Two discs of radii Rand 2R are moving with velocities vand 2v in opposite directions on a conducting platform as shown in the figure If magnetic field Bis applied on the plane perpendicular to the discs then the potential difference between two points Pand Q which are the topmost points of the discs is Only one correct answer V4 A 8BRv B C 4BRv 10 BRV 2R

1 VA Va 3 VA VB 4 VVB The relative velocity of two objects A and B is 10 m s If the velocity of object A is 40 m s then the with which B is moving is assume both objects are moving in same direction 2 40 m s 4 15 m s 1 10 m s 3 30 m s

A small sphere of mass mand having charge qis suspended by a silk thread of length in a uniform horizontal electric field If it stands at a distance x from the vertical line from point of suspension then magnitude of electric field is Only one correct answer A B C C mg q mga 77 mgx 9 2 2 mgl

Electrons flow through a 1 7 mm diameter aluminum wire at 1 9x10 m s Part A How many electrons move through a cross section of the wire each d Express your answer using two significant figures VAE

22 Two objects A and B are moving with velocities V and va respectively in the same direction The magnitude of relative velocity of Aw r t Bis 1 VA VB 3 VB VA 2 VA VB 4 VVB

For a particle constrained to move along x axis potential energy is given by U 4x 3x Then A The positions corresponding to equilibrium are x 0 and x B x C X D If the particle is released in the right neighborhood of x force after a while is ve A 8 9 corresponds to stable equilibrium corresponds to unstable equilibrium the power delivered b A

2 A plate clutch having a single driving plate with contact surfaces on each side is required to transmit 110 kW at 1250 r p m The outer diam eter of the contact surfaces is to be 300 mm The coefficient of friction is 0 4

C 1 D same as of radius of curvature A light of ray incidents normally on one side of equilateral prism If refractive index of prism 1 5 then deviation angle is person or for A 30 B 60 C 45 D 75

A cyclist is 24 metres behind a bus If bus starts from rest with constant acceleration of 2m s while at same time cyclist moves with constant speed of 10m s then time when cyclist will overtake bus O O O 2 sec 4 sec 6 sec 10 sec

body is at rest or moving at a constant speed in a straight line it will remain at rest or keep moving in a straight line at constant speed unless it acted upon by an unbalanced force This statement is accordin o Newton law of motion first second third

you certainly draw Answer A B C D Your Attempt Correct answer Rate this question If Fe Fm for like charges and F Fm for unlike charges both the spheres must be made of insulating materials If Fe Fm for like charges and Fe Fm for unlike charges both the sphe must be made of conducting materials Irrespective of their materials Fe Fm for like charges and Fe Fm for unlike charges Irrespective of their materials Fe Fm for like charges and F Fm for unlike charges

1 A ship A is moving Westwards with a speed of 10 kmh and a ship B 100 km South of A is moving Northwards with a speed of 10kmh The time after which the distance between them becomes shortest is A Oh C 5 2h A Incorrect Marked By You B Correct Not Marked By You B 5h D 10 2h

A ladder stands on a frictionless floor and leans against a frictionless wall It is initially held motionless with its bottom end an infinitesimal distance from the wall It is then released where upon the bottom end slides away from the wall and the top end slides down the wall When it loses contact with the vertical wall then find angle made by rod with horizontal direction at this instant 12 B 0 Sin 3 D A 12 0 Cos 3 C 0 Cos 11 I3 0 Sin 11 3 1

Two balls are projected from top of a tower height 120 m one with initial upward velocity c 36 km h and other with initial downward velocit of 36 km h The speed of each ball just befor hitting the ground is Take g 10m s A 50 m s 70 m s B 50 m s 50 m s D 50 m s 5 2m s C 70 m s 50 m s A B Correct Not Marked By You

A metallic rod AB moves on a V shaped conducting wire with speed v as shown in figure such that at given instant of time OA OB L If magnetic field in the space is perpendicular downwards and has magnitude B then induced emf in the rod is B 60 OBVL O 3 BVL Bvl 2 O Zero

When two cells of emf E and E are connected in series the null point across potentiometer wire i obtained at 60cm When polarity one cell is reversed null point is obtained at 40cm E Hence E2 is equal to Consider E E

Two circular coils have their centres at the same point The mutual inductance between them will be maximum when their axis is O At 45 to each other At 60 to each other O Parallel to each other O Perpendicular to each other

A boat which has a speed of 5 km hr in still wate crosses a river of width 1 km along the shortes possible part in 15 minutes The velocity of the river water in km hr is A 3 C 21 A Correct Skipped By You B B 4 D 1

5 Two identical condensers are first connected in series and then in parallel If the equivalent capacity in parallel grouping is 40 F equivalent capacity in series group ing is 1 1 F 4 15 F 2154 F 3 10 F

The coefficient of mutual inductance between two coils depends upon O Geometry of coils O Orientation of colls O Medium between coils O All of these 6 11 16 21 26