General Questions and Answers

GR0079 80 Orbital radius of a satellite S of earth is four times that of a communication satellite C Period of revolution of S is 1 4 days 3 16 days 2 8 days 4 32 days

d is discontinuous at r R 1 a c 2 c d 3 a b 4 b d ES003 7 20 C charge is placed inside a closed surface the flux linked with the surface is 6 If 80 C charge put inside the surface then change in flux is 1 40 2 50 3 4 80 ES003

ALLEN 114 When unpolarized light beam is incident from air onto glass n 1 5 at the polarizing angle 1 Reflected beam is 100 percent polarized 2 Reflected and refracted beams are partially polarized 3 The reflected and refracted ray will not perpendicular to each other 4 All of the above WO0115 115 When the angle of incidence on a material is 60 the reflected light is completely polarized The velocity of the refracted ray inside the material is in ms 1 3 x 10 3 3 x 10 10 2 4 0 5 x 10 WO0116 116 A polaroid is placed at 45 to an incoming light of intensity 1 Now the intensity of light passing through polaroid after polarisation would be 1 L 2 1 2 3 1 4 4 Zero WO0117 117 Plane polarised light is passed through a polaroid On viewing through the polariod we find that when the polariod is given one complete rotation about the direction of the light one of the following is observed 118 Pre Medical Physics 107 1 The intensity of light gradually decreases to zero and remains at zero 2 The intensity of light gradually increases to a maximum and remains at maximum 3 There is no change in intensity 4 The intensity of light is twice maximum and twice zero WO0118 Polarised glass is used in sun glasses because 1 It reduces the light intensity to half on account of polarisation 2 It is fashionable 3 It has good colour 4 It is cheaper W00119 119 When a plane polarised light is passed through an analyser and analyser is rotated from 0 to 90 the intensity of the emerging light 1 Varies between a maximum and minimum 2 Becomes zero 3 Does not vary 4 Varies between a maximum and zero WO0120 120 When an unpolarized light of intensity I is incident on a polarizing sheet the intensity of the light which does not get transmitted is 1 Zero 2 1 3 1 4 1 WO0121

ALLEN from the 88 A communication satellite of earth which takes 24 ite of the hrs to complete one circular orbit eventually has to be replaced by another satellite of double mass If the new satellites also has an orbital time period of 24 hrs then what is the ratio of the radius of the al arbit 2 s

tation of the th GR0074 sorbit which arth s surface The speed will be VR h 4 R g GR0078 79 Two artificial satellites of masses m and m are moving with speeds v and v in orbits of radii r and r respectively If r r then which of the following statements in true 1 v V 3 v V 2 v V 4 v r V T GR0079

ES0028 30 Two small identical spheres each of mass 1 g an carrying same charge 10 C are suspended by threads of equal lengths If the distance between the centres of the spheres is 0 3 cm in equilibrium then the inclination of the thread with the vertica will be 1 tan 0 1 3 tan 1 5 2 tan 2 4 tan 0 6 Sessi 56002

sun is 60 m s then what will be its velocity in m s when it is farthest 1 12 2 60 3 112 1 m me and r 3 me only 4 6 GR0085 6 A satellite of mass m goes round the earth along a circular path of radius r Let me be the mass of the earth and R its radius then the ar speed of the satellite depends on 2 m Re and r 4 me and r GR0086

b 4 b d ES0035 closed surface then If 80 C charge is ange in flux is 4 80 42 If the electric flux entering and leaving a closed surface is and respectively then electric charge inside the surface will be 3 1 02 50 2 4 02 01 4 50 ES0041

Pre Medical Physics 49 ic field 32 Choose the correct statement regarding electric lines of force 1 They emerge from negative charge and terminate at positive charge 2 The electric field in that region is weak where the density of electric lines of force are more 3 They are in radial directions for a point charge 4 They have a physical existence ES0031

aving linear y are placed gth on either 35 A sphere of radius R and charge Q is placed inside a concentric imaginary sphere of radius 2R The flux associated with the imaginary sphere is 2 20 1 3 ol 4Q ED 4 2Q 0

ace 27 93 A satellite of mass m revolves in a circular orbit of radius R a round a planet of mass M Its total energy E is 1 3 GMm 2R GMm R 2 4 GMm 3R GMm R GR0093

9 1x10 C charge is on a drop of water having mass 10 kg What electric field should be applied on the drop so that it is in the balanced condition with its weight 1 10 V m upward 2 10 V m downward 3 0 1 V m downward 4 01 V m unward a total charge C electric field is KQr R wher 2 where 3 it is zero at

Mass is less than the mass of earth GR0074 75 If the satellite is stopped suddenly in its orbit which is at a distance radius of earth from earth s surface and allowed to fall freely into the earth The speed with which it hits the surface of earth will be 1 7 919 m s 2 7 919 km s 3 11 2 m s 4 11 2 km s

A circular wire loop of radius 1 cm carries a total charge 1x10 C distributed uniformly over its length If 0 01 of its length circumference is cut off then the electric field at the centre of the loop due to the remaining wire is 9x10 SI unit Take Options 1 4 2 3x10 N C 6x10 N C 9 10 N C

Pre Medical Physics 211 78 What will be velocity of a satellite revolving around the earth at a height h above surface of earth if radius of earth is R g 1 R R h g 2 R R h

The gravitational force between two bodies is 1 directly proportional to not where R is R the distance between the bodies Then the orbital speed for this force in circular orbit is proportional to 1 1 R 2 R 3 R 4 1 R GR0077

J d of 6 71 GR0070 If two bodies of mass M and m are revolving around the centre of mass of the system in circular orbit of radii R and r respectively due to mutual interaction Which of the following formula is applicable GMm mor 1 R GMmme R 2 4 GMm R me r GMm mor

CGR0067 68 A space shuttle is launched in a circular orbit near the earth s surface The additional velocity be given to the space shuttle to get free from the influence of gravitational force will be 1 1 52 km s 2 2 75 km s 3 3 28 km s 4 5 18 km s

52 Escape velocity of a body from earth is 11 2 km s Escape velocity when thrown at an angle of 45 from horizontal will be 1 11 2 km s 2 22 4 km s 3 11 2 2 km s 11 22 km

from orbital k done is GMm 3R GR0064 for a planet 4 Zero GR0065 distance from ALLEN 70 If the length of the day is T the height of that TV satellite above the earth s surface which always appears stationary from earth will be 1 h 2 h 4n GM T 3 h 47 GM T GMT2 4x CMT27 R R

onal field is a 5kg body ill be GR0038 he mass of ergy of an R from the moon will ARISTS 3 5 GM 14 R 1 4 GR0042 43 The gravitational potential energy of a body at a distance r from the center of the earth is U The force at that point is 3 Ur 3GM R IC Y 4 Ur

2 Two satellites of same mass mare revolving round of earth mass M in the same orbit of radius r Rotational directions of the two are opposite therefore they can collide Total mechanical energy of the system both satallites and earths is m M 1 GMm T GMm 2 2GMm

GR0052 3 The escape velocity from the earth is 11 2 km s the mass of another planet is 100 times of mass of earth and its radius is 4 times the radius of earth The escape velocity for the planet is 1 56 0 km s 2 280 km s 3 112 km s 4 11 2 km s 32 EXERCISE P65

energy of an ce R from the of moon will 81 81 R R 1 SR 5 3 Ur r 4 Ur GR0043 44 A particle falls from infinity to the earth Its velocity on reaching the earth surface is 1 2Rg 2 Rg 3 Rg 4 2Rg

The conversation going on in some room can be heared by the person outside the room The reason for it is 1 Interference of sound 2 Reflection of sound 3 Diffraction of sound 4 Refraction of sound WO0079 1 ec 3 lits 85 Diffra are o 1 sa 2 dil

11 The angle of incidence at which reflected light is totally polarized for reflection from air to glass refractive index n 1 sin n 9 3 tan 2 sin 0 4 tan n

210 64 Pre Medical Physics A satellite of earth of mass m is taken from orbital radius 2R to 3R then minimum work done is

WO0120 20 When an unpolarized light of intensity I is incident on a polarizing sheet the intensity of the light which does not get transmitted is 1 Zero 2 1 3 4 L

3 tan 4 tan n WO0112 2 A ray of light is incident on the surface of a glass plate at an angle of incidence equal to Brewster s angle If u represents the refractive index of glass with respect to air then the angle between reflected and refracted rays is 1 90 2 sin ucose 3 90 4 90 sin sind u POBO

48 A particle of mass m is moving in a horizontal ciricle 53 of radius R under a centripetal force dice particle A A constant The total energy of the is Potential energy at very large distance is zero A A R R 1 2 3 SOSIO A 2R 4 A 2R

1 One projectile after deviating from its path starts moving round the earth in a cirular path of radius equal to nine times the radius of earth R Its time period will be 1 2 3 R g R g 2 27 2 4 0 8x3m 9 RS g GROO61

037 face 20m eld is J 42 A body attains a height equal to the radius of the earth when projected from earth surface The velocity of the body with which it was projected is 3 R si 2020 21 5 GM V4 R 4 2GM R 3GM VR GR0042

23 Two positive charges of 1 C and 2 C are placed 1 metre apart The value of electric field in N C at the mid point of the two charges will be 1 10 8 x 104 2 3 6 10 3 1 8 x 104 4 5 4 x 10 27 A semicircular charged with a electric field int 1 zero 3 64 V m

114 When unpolarized light bear is incident from air onto glass n 1 5 at the polarizing angle 1 Reflected beam is 100 percent polarized 2 Reflected and refracted beams are partially polarized 3 The reflected and refracted ray will not perpendicular to each other All of the above 4 6 0 118 F

perpendicular to each other 4 All of the above WO0115 115 When the angle of incidence on a material is 60 the reflected light is completely polarized The velocity of the refracted ray inside the material is in ms 1 3 x 10 3 3 x 10 3 x 10 2 4 0 5 x 10 WO0116 116 A polaroid is placed at 45 to an incoming light of intensitul Now the intensity of light naging through

GR0046 47 An artificial satellite moving in a circular orbit around the earth has a total kinetic potential energy E Its potential energy is 1 E 3 2E0 2 E 4 2E0

e surface of a will be s GR0049 54 Body is projected vertically upward from the surface of the earth with a velocity equal to half the escape velocity If R is radius of the earth the maximum height attained by the body is 3 R 1 2 R 3 4 R ARGET VPHYENGMODULE 0101 BASC MAT

56 Two artificial satellites A and B are at a distance r and r above the earth s surface If the radius of earth is R then the ratio of their speed will be 1 3 R TA R 2 4 T R A R 1

92 WO0092 A light source of 5000A wave length produces a single slit diffraction The first minima in diffraction pattern is seen at a distance of 5mm from central maxima The distance between screen and slit is 2 metre The width of slit in mm will be S 1 0 1 2 0 4 3 0 2 4 2 WO0093

57 The average radii of orbits of mercury and earth around the sun are 6 x 107 km and 1 5 x 10 km respectively The ratio of their orbital speeds will be 1 5 2 3 2 5 1 2 2 5 4 125

7 Young s double slit experiment is performed with light of wavelength 550 nm The separation between the slits is 1 10 mm and screen is placed at distance of 1m What is the distance between the consecutive bright or dark fringes 1 1 5 mm 2 1 0 mm 3 0 5 mm 4 None of these 7

VO0065 periment screen hift downward by 10 fringes WO0070 71 In YDSE experiment when two light waves make third minima then they have 1 Phase difference of 3m 5x 2 Phase difference of 2 3 Path difference of 3 5

mm 3 2 mm mm 4 0 1 mm WO0076 6 In Young s double slit experiment when wavelength of 700 nm is used then fringe width of 0 7 mm is obtained If wavelength of 500nm is used then what is the fringe width 1 0 35 mm 3 3 5 mm 2 0 5 mm 4 5 mm WO0077

What will be the effect on fringe width when distance between slits become doubled 1 1 2 times 2 2 times 3 1 4 times 4 Unchanged IFFRACTION WO0078 3 Interfere 4 Polarisa 84 In the diffr the width c of the othe 1 equal

4 ALLEM What is molecular weight of a substance whose 7 0 by mass solution in water freezes at 0 93 C K for water is 1 86 K kg mol 34 140 g mol 2 150 5 g mol 0 93 1 2 Fax 3 160 g mol 4 155 g mol 70 1 806 042 14 09 Find out correct set of homocyclic compounds 1

A monochromatic beam of light is used for the formation of fringes on the screen by illuminating the two slits in the Young s double slit interference experiment When a thin film of mica is interposed in the path of one of the interfering beams then 1 The fringe width increases 2 The fringe width decreases 3 The fringe width remains the same but the pattern shifts 4 The fringe pattern disappears

Mass of MgCl2 Moles of MgCl2 Theoretical Moles of AgCl Theoretical Mass of AgCl Mass of AgCl 0 033621 0 067242 8 6371 8 6644 MgC12 2 AgNO3 Mg NO3 2 2 AgC1 Use the table and equation given to find the experimental mass mole and percent yield of CLCL C11

ger than o gravity e surface GR0031 36 Two different masses are droped from same heights When these just strike the ground the following is same 1 kinetic energy 3 linear momentum 2 potential energy 4 acceleration GR0036

51 The ratio of radii of two satellites is p and the ratio of their acceleration due to gravity is q The ratio of their escape velocities will be 1 3 pq 2 Plo 4 pq GR0051

1 Imagine a new planet having the same density as that of earth but its radius is 3 times bigger than the earth in size If the acceleration due to gravity on the surface of earth is g and that on the surface of the new planet is g then 1 g 3g 2 g g 9 3 g 9g 4 g 27 g GR0031