Physics Questions

liquid of refractive index u is poured on glass g 1 5 slab to form a thin layer c g thickness t 2 5 A monochromatic ligh beam of wavelength is incident at small angl with normal For normal viewing of reflecte light Which of the following is are not correct 1 If 1 6 minimum will be observed 2 If 1 8 maximum will be observed 3 If u 1 4 minimum will be observed 4 If u 1 3 maximum will be observed

Match the following Mixture of chalk and water Mixture of sand and water Mixture of iron filings salt and sand Husk and paddy Magnetic separation Decantation Filtration Hand picking

spherical portion of radius Restic From a solid sphere of mass M and radius R a shown Find gravitational potential at of cavity M R 1 3 4GM R 3 GM 2 R siast Course Il 14 44 R 2 2 GM R 4 None of these M from 1 3 a fav 4GM R 3 GM 2 R Space for Rough Work fery Ge ya z u M fanger R feren aan een nahm M R R 2 2 4 Y GM R 1001CMD30222000 E H 0909202

128168 current carrying As shown in diagram a conductor is subjected to steady uniform magnetic field Then B Torque t 0 force F 0 Torquet 0 force F 0 Torque T 0 force F 0 Torque T 0 force F 0

SSAGE aser system is capable of Ex 10 Sev K or 1 38 x 10 lasing at several infrared wavelengths where the most prominent wavelength is 3 1235 mm Given k power 23 J K The relative population of these states at 27 degree Cis OPTIONS 0 23 0 56 0 75

PASSAGE The energy difference between first excited state and ground state of a given system is 1 96 eV The transition occurs between first excited state and ground state Given K 8 6 X 10 5 eV K or 1 38 X 10 power 23 J K Choose the correct options Marks 2 The ratio of poulation of excited versus ground state at 27 degree celsius is OPTIONS 0 326x10 31 0 56 10 31 1 1x10 33

A rod is clamped at both of its ends and stationary longitudinal waves are produced in it In first experiment the rod has a total of 4 nodes with amplitude of each anti node to be 1 mm In other experiment the rod has a total of 6 nodes with amplitude of each anti node to be 2mm The energy of vibrations in the rod in two cases is E and E2 respectively E Write value of E2 Question Type Numerical Type

A positive charge particle having charge q enters a region where magnetic flux density is Bo with speed vo as shown in the figure The time after which it will come out of the field is symbols have their usual meanings X X XK 6 X X X X X X X X X X X X X X X X X Bo X X X X X X X X X X X X X X

1 28 N 2 16N 3 32 N 4 72 N Consider the following statements 36 S An object shall weigh more at pole than at equator when weighted by using a physical balance S It shall weigh the same at pole and equator when weighed by using a physical balance S It shall weigh the same at pole and equator when weighed by using a spring balance S4 It shall weigh less at the pole than at equator when weighed using a spring balance Which of the above statement is correct 1 S 2 S 3 S 4 1 28 N 2 16 N 3 32 N 4 72 N ffeferat framfort S feft aega tegell and at a gat e giar o S fat are at the end har en Syft Sfat eram ne question a 1 S ten af af 2 S that gall ar an nan vi gai den gell at 11 a 4 ya 3 Sy 4 SA

er system is capable of lasing at several infrared wavelengths where the most prominent ngth is 3 1235 mm Given k 8 6x 10 5eV K or 1 38 X 10 power 23 J K Choose the correct options Marks 2 Which state is occupied by atoms under conditions of th OPTIONS excited state ground state metastable state

4 The formula for centrepetal acceleration in a circular motion is u an d 2 1 3 x v 4

PASSAGE A step index fiber is made with a core of refractive index 1 36 a diameter of 49 m and a fractional refractive index change of 0 025 it is operated at a wavelength of 1 3um Choose the correct options Marks 2 The normalized frequency of the fiber is OPTIONS 25 7

49 A body is performing simple harmonic motion with amplitude a and time period T Variation of its acceleration f with time t is shown in figure If at time t velocity of the body is v which of the following graphs is correct a Taxat A fada fa TRI 1 T 4 TTT 24 T 4 3T A T T 4 2 2 T 2 T 4 3 T t TT 4 4 T in 2 T 4

R 4 20 V 10 6 V R 3 70 V 8 9 V I I Is R 5 50 V3 6 9 V The resistances and voltages in the figure take the values shown above Determine all three currents 1 R 5 60 R ww V R V R 12 R 3 80 R5 V3 13 R3

A charged particle of mass m enters a region of uniform magnetic field B with velocity making an angle of 30 with the direction of the magnetic field The path of such a particle is

A small insect is at 60 cm from a concave mirror of focal length 20 cm What is the image distance from the mirror 30 cm 20 cm 15 cm 18 cm

Two thin long parallel wires separated by a distance b are carrying a current i amp each The magnitud of the force per unit length exerted by one wire on the other is bfed ad af ar dr i A ERI dette Gr G YG AR GRI ZE AR Y CIRI GI IN 1 Mo i b 2 Hoi 2Th 3 Hoi 2 b 4 Hoi 2Th

In the situation shown in the figure the system is in equilibrium All the strings spring and pulley are light Just after cutting the string AB then the tension in string GH is N Take g 10 ms H 1 kg 5 kg 0000 B F E 1 kg D 2 kg A

1 S 2 S 3 S For the given diagram find the gravitational 37 potential at the centre of the square is m m Gm a 1 2 2 Gm a 3 4 m a 2 m 4 Telefran Gm 4 2 a Gm 4 2 3 1 S 2 S 3 S fact T fast af kunft gecata fava m Gm 1 2 2m a 3 m Gm a a a m m 4 SA Gm a Gm a 2 4 2 4 2 3

Resolving power of compound microscope is given by symbols have their usual meaning d 1 d de 1 de 2 sin e 2 sin e 2 1 222 D D 1 22

A high speed car and an innocent insect have a head on collision The force of impact splatters the poor insect over the windshield Is the corresponding force that the insect exerts against the windshield greater less or the same Is the retardation of the car greater than less than or the same as that of the insect

39 A particle of mass M is situated at the centre of a spherical shell of same mass and radius a The a magnitude of the gravitational potential at a point situated at distance from the centre will be 2 My fa feed far fare odia faxa en un am GM a 1 2 2GM a 3GM a 4 4GM a

31 Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is ESC GH F CH M11547 7 3142 suit at waffech c div si a cuid di 1 9 31 2 5 27 3 3 23 4 7 29

20 If a baseball player can throw a ball at maximum distance d over a ground the maximum vertical height to which he can throw it will be Ball has same initial speed in each case d 2 ovom 3 2d aig 1 2 d Fining 4 d

5 In the circuit shown in figure ter 25 and voltmeter are ideal If E 4V R and r 102 then readings of ammeter and voltmeter are 1 1A 3V 3 3A 4V R 2 2A 3V 4 4A 4V quest ffatter of E 4V R atceteriri E r 1 1A 3V 3 3A 4V S R 2 2A 3V 4 4A 4V fer

An object of height 2 cm is placed at a distanc 20 cm in front of a concave mirror of focal length 12 cm Find the position size and nature of the Ans 30 cm in front of mirror 3 cm image high real inverted and magnified

Q 9 One cubic plate having 15 cm side floats on water surface If surface tension of water is 60 dyne cm To lift this plate from water Find the extra force required against weight 1 3600 dyne 2 1800 dyne 3 900 dyne 4 7200 dyne

Three electric bulbs whose resistance are in ratio of 1 2 3 are connected in parallel to constant voltage source The power dissipated them has the ratio P P P3 1 1 2 9 4 39 4 1 p 2 R so P2 P3 26 R 2 3 2 1 4 1 1 1 Ri

PASSAGE A laser system is capable of lasing at several infrared wavelengths where the most prominent vavelength is 3 1235 mm Given k 8 6x 10 5eV K or 1 38 X 10 power 23 J K Which state is occupied by atoms under conditions of therma OPTIONS excited state ground state metastable state

PASSAGE In Ruby laser total number of Cr3 ions is 3x10 power 19 The laser emits radiation of wavelength 6940 Choose the correct op The energy of one emitt OPTIONS 2 86x10 power 19 J 6 23x10 191

shown in the figure A to B the correct option is P 4 Po Po B Vs 3V 1 Temperature first decreases then increases 2 Temperature first increases and then decreases 3 Temperature will continuously decrease 4 Temperatur or

PASSAGE A glass clad fiber is made with core glass of refractive index 1 4 and the cladding is doped to give a fractional refractive index difference of 0 004 Choose the correct options Marks 1 The refractive index of cladding will be OPTIONS 1

The curve represents the distribution of potential along the straight line joining the two charges Q and Q2 separated by a distance r then which is of the following statements are correct A Q A Q B C 4 1 Q Q 1 2 Q is positive in nature 3 A and B are equilibrium points 4 C is a point of unstable equilibrium dhe shi VER

2 3 A body moves in a straight line along x axis Its distance x in metre from the origin is given by x 8t 31 The average speed in the interval t 0 to t 1 second is 1 5 ms 1 2 4 ms 3 6 ms 1 4 zero

8 Three objects are connected by ropes on a frictionless floor as 20N a 1Kg 0 O 3Kg a Find T b Find acceleration on 3kg c Find n on 3kg d Find the net force on 3kg block a 5 4Kg 4N ngure then

5 A rectangular coil has 60 turns and its length and width is 20 cm and 10 cm recpectively The coil rotates at a speed of 1800 rotation per minute in a uniform magnetic field of 0 5 T about its one of the diameter The maximum induced emf will be Uch dich us 60 Jul af fa al ad all 1 60 V 2 220 V 20 310 40 5 1800 ufa fuae ant alcd fi fhu 414 fa quia s c t 3 113 V 4 330 V

A laser system is capable of lasing at several infrared wavelengths where the most prominent wavelength is 3 1235 mm Given k 8 6x 10 5eV K or 1 38 x 10 power 23 J K Choose the correct options Marks The relative population of these states at 45 degree C OPTIONS 0 98 0 78 0 58

47 A rigid body contain only two particle as shown The condition which must be satisfied fagur 1 2 1 V 30 2 3V V 0 2 60 B 3 2V V 0 4 V 3V 0

An electron of mass m and charge e is accelerated by a potential difference V It then enters a uniform magnetic field B applied perpendicular to its path The radius of the circular path of the electron O r 2mV eB 2meV B 2mB eV

A quantity of heat Q is supplied to a monoatomic ideal gas which expands at constant pressure Th fraction of heat that goes into work done by the gas is fed ad fa t v cevi T QHEN GAR R 1 2 5 2 3 35 5 3 2 3 4 1

A current carrying loop of radius r carries a current I in clockwise direction It is placed in a uniform magnetic field B such that plane of coil makes an angle 30 with the direction of magnetic field The net torque on the coil will be 3r 1B 2 O r lB O Zero

3 A child stands at one end of a boat moving with a speed v in still water If the child starts running towards the other end of the boat with a speed u the centre of mass of the system will move with a speed A day at 42 4ch dtall a r far fach auf d 1 v u 2 v 3 u 4 v u

A defective satellite of mass 950 kg is being towed by a spaceship in empty space The two vessels are connected by a uniform 50 m rope whose mass per unit length is 1 kg m The spaceship is accelerating in a straight line with acceleration 5 m sec2 a What is the force exerted by the spaceship on the rope b Calculate the tension along the rope c Due to exhaustion the crew of the spaceship falls asleep and a short circuit in one of the booster control circuits results in the acceleration changing to a deceleration of 1 m sec Describe in detail the consequences of this mishap

32 The minimum number of capacitors of capacitance 2 F in order to obtain resultant capacitance 5 F will be 2F 1 4 2 5 eller alfey for such a 3 7 gre unfal 5 F 4 8

A PV diagram for a thermody shown in he figure Then for the process choose the correct option PA 4P Pa A B V 3V 1 Temperature remains constant through out 2 Temperature continuously increases 3 Temperature first decreases then continuously increases 4 Temperature first increases then cont nuously decreases

20 Find RAB If resistance of each side RO 3R 1 R 3 R 2 2 2 4 8R ALLEN 20 Rie The reading of the ammeter as per figure 21 shown is 1 3 R 2 2R 5 4 SR 2

D ce of radius R separates two medium of refractive indices and as shown in figure Where should an object be placed in the medium 1 so that a real image is formed in medium 2 at the same distance 1 O X H H H H P R M X I 2 M H H H R

Each of the resistors shown in the figure has 19 resistance R Find the equivalent r sistance between A and B 3 OR usiast Course 4 09092020 B SR TIR Space for Rough Work fax veftia vrte u b Bum 7R 1 22 ea HIR

1 The coefficient of thermal conductivity of copper is nine times that of steel In the composite cylindrical bar shown in the figure what will be the temperature at the junction of copper and steel dia 3041 alcal quich zuld 3041 Alccal quis ga fax f ar n ziy nik 95 atau sud if i 114413 1 75 C 100 C 2 67 C 18cm copper iron 6cm 0 C 3 33 C 4 25 C

travelling along a track at a constant speed of 40 m s A TV camera man is recording the event from a distance of 30 m directly away from the track as shown in figure In order to keep the car under view in the position shown the angular speed with which the camera should be rotated is Track 30 m TV Camera rad s 3 85 2 rad s 40 m s