General Questions and Answers

46 Two small and heavy spheres each of mass M are placed a distance r apart on a horizontal surface The gravitational potential at the mid point on the line joining the centre of the spheres is GM 1 Zero 2 4 3 2GM 4GM

3 elliptical 4 plane WO010 04 If in Fraunhofer diffraction due to a single slit th slit width is increased then the width of the centr maximum will 1 increase 2 decrease 3 not change 4 change depends on the wavelength light used

7 In a single slit diffraction pattem if the light source is used of less wave length than previous one Then width of the central fringe will be 1 less 2 increase 3 unchanged 4 none of the above

5 The imaginary angular velocity of the earth for which the effective acceleration due to gravity at the equator shall be zero is equal to 1 1 25 x 10 rad s 2 2 50 x 10 rad s 3 3 75 x 10 3 rad s 4 5 0 x 10 rad s Take g 10m s for the acceleration due to gravity if the earth were at rest and radius of earth equal SE P65

WO0093 93 A plane wave front of wave length 6000 is incident 100 Ang upon a slit of 0 2mm width which enables Fraunhofer s diffraction pattem to be obtained on a screen 2 metre away Width of the central maxima in mm will be patte 1 D 2 W 1 10 3 8 3 W 4 F 2 12 4 2 WO0094

WO0056 62 mica sheet of introduced in ce S By how I be displaced 1 t 1 WO0057 ength 6000A 0 8 mm at a WO0061 In a Young s double slit experiment a slab of thickness 1 2 m and refractive index 1 5 is placed in front of one slit and another slab of thickness t and refractive index 2 5 is placed in front of the second slit If the position of the central fringe remains unaltered then the thickness t is 1 0 4 m 2 0 8 m 3 1 2 m 4 7 m T WO0062

WO0055 ered with a ilter Then WO0056 ca sheet of 61 62 1 The fringes will disappear 2 The fringe width will decrease 3 The fringe width will increase 4 There will be no change in the fringe width WO0060 The central fringe of interference pattern produced by light of wavelength 6000A is found to shift to the position of 4th bright fringe after a glass plate of u 1 5 is introduced The thickness of the glass plate is 1 4 8 m 3 14 98 m 2 8 23 m 4 3 78 m WO0061 In a Young s double slit experiment a slab of thickness 1 2 um and refractive index 1 5 is placed

A 30 6 mL sample of 2 00 M sodium chloride is mixed with 15 6 mL of 0 950 M silver nitrate solution and precipitation occurs The solid is AgCl and has a mass of 2 32 g The name of the limiting reactant is The theoretical yield of AgCl is The mass percent yield of AgCl is How many moles of excess reactant are left g Keep the correct sig figs mol

04 5 3 Remain unaffected 4 First increase then decrease WO0069 Pre Medical Physics Monochromatic green light has wavelength 82 5x107m The separation between slits is 1 mm The fringe width of interference patem obtained on nca of 0 u W 1 3 W is e

2 The fringe width will decrease 3 The fringe width will increase 4 There will be no change in the fringe width WO0060 The central fringe of interference pattern produced by light of wavelength 6000A is found to shift to the position of 4th bright fringe after a glass plate of u 1 5 is introduced The thickness of the glass plate is 1 4 8 m 3 14 98 um 2 8 23 m 4 3 78 m

16 One can easily weigh the earth by calculating the mass of earth using the formula in usual notation 1 3 RE 2 4 010 010 R R GR0016 of plane surface 1 2 3 Equa 23 Gravitati

ALLEN 37 Which of the following curve expresses the variation 40 of gravitational potential with distance for a hollow sphere of radius R R 2 IV t 3 V 4 V R R R r 41 42

4 control the rotational motion of electrons in atoms Mass particles of 1 kg each are placed along x axis at x 1 2 4 8 Then gravitational force on 7 a mass of 3kg placed at origin is G universal gravitational constant 1 4G 2 4G 3 GR0001 3 2G 3 The 1 T 2 T

11 A missile is launched with a velocity less than the escape velocity Sum of its kinetic energy and potential energy is 1 Positive 2 Negative 3 May be negative or positive depending upon its initial velocity 4 Zero CR00Y

27 When the radius of earth is reduced by 1 without changing the mass then the acceleration due to gravity will 1 increase by 2 3 increase by 1 2 decrease by 1 5 4 decrease by 1 33 If th weig 1 in 3 b

3 Acceleration of two bodies 4 None of these GROOO Three identical bodies each mass M are placed a vertices of an equilateral triangle of arm L keepin the triangle as such by which angular speed th bodies should be rotated in their gravitational field so that the triangle moves along circumference circular orbit 1 3 3GM L 3 GM 3L 2 GM 4 3 GM

ALLEN 2 The change in the value of g at a height h above the surface of the earth is same as at a depth d If d and h are much smaller than the radius of earth then which one of the following is correct 1 d h 2 d 2h

38 Gravitational potential difference between surface of a planet and a point situated at a height of 20m above its surface is 2 J kg If gravitational field is uniform then the work done in taking a 5kg upto height 4 meter above surface will be 1 2 J 2 20 J 3 40 J session 10

shifts 4 The fringe pattern disappears WO0073 In an interference experiment third bright fringe is obtained at a point on the screen with a light of 700 nm What should be the wavelength of the light in order to obtain 5th bright fringe at the same point 1 500 nm 2 630 mm 4 420 mm 3 750 nm

204 10 Pre Medical Physics An earth s satellite is moving in a circular orbit with a uniform speed v If the gravitational force of the earth suddenly disappears the satellite will 1 vanish into outer space 2 continue to move with velocity vin original orbit 3 fall down with increasing velocity

11 3 h 2 1 R 4 h 2 1 R 2 2m 20 At some planet g is 1 96 m sec If it is safe to ju from a height of 2m on earth then what should corresponding safe height for jumping on t planet 1 5m GROO 3 10m 4 20 GROO

Pre Medical Physics 103 A double slit experiment is performed with light of wavelength 500 nm A thin film of thickness 2um and refractive index 1 5 is introduced in the path of the upper beam The location of the central maximum will 1 Remain unshifted 2 Shift downward by nearly two fringes 3 Shift upward by nearly two fringes

3 increase by 0 5 4 increase by 1 GR0028 9 Acceleration due to gravity at earth s surface is g m s Find the effective value of acceleration due to gravity at a height of 32 km from sea level R 6400 Km 1 0 5g m s 3 1 01g m s 2 0 99g m s 4 0 90g m s sion

ates between a low da high temperature of performance is T TH TJ 257 If the system takes 100 cal heat and releases 80 cal to sink if source temperature is 127 C find the sink temperature 1 47 C 1216701 2 127 C 1079

206 Pre Medical Physics 26 When you move from equator to pole the value 32 The change of acceleration due to gravity g the surface 1 increases If d and h 2 decreases earth then 3 remains the same 1 d h

For ideal gas Z 1 As for the given gas Z 1 it shows negative deviation i e it is more compressib than expected from ideal behaviour Sample Problem 4 The van der Waals constant b for oxygen is 0 0318 L mol Calculate t diameter of the oxygen molecule

Consider the change in ox to different emf values as shown in the given diagram 1 82 V Bro BrO 1 5 V HBrO 1 0652 V A BrO3 C Br Br Br The species undergoing disproportionation is Retangular Snip 1 595 V B BrO4 D HBrO NEET 2018

The decreasing order of basic natures of is 1 Na O K 0 MgO Al O3 2 K O Na O MgO Al O3 3 Al O Na 20 MgO K O 4 MgO Na O K 0 Al O

Z Js The value of Planck s constant is 6 63 10 34 The velocity of light is 3 0 108 ms Which value is closest to the wavelength in nanometer of quantum of light which frequency 8 10 5 s 1 4 10 THE 2 3 107 3 2x 1025 4 5 x 10 18

A certain gas effuses out of two different vessels A and B A has a circular orifice while B has a square orifice of length equal to the radius of the orifice of vessel A The ratio of rate of diffusion of the gas from vessel A to that from vessel B is 1 1 2 1 3 1 1 4 3 2

Atoms A B C D are present at corners fcc b cc ecc respectively if atoms touching one o f the 2 fold axis 3fold axis 4 fold axis are re moved then total number of atoms remaini ng per unit cell is X 1 4 Value of x is

38 A 100 g sample of Haemoglobin on analysis was found to contain 0 34 Fe by mass If each haemoglobin molecule has four Fe ions the molecular mass of haemoglobin is Fe 56 amu a 77099 9 g c 65882 g b 12735 g d 96359 9 g

The rate constant of the reaction A B is 0 6 x 10 3 mole per litre per second If the concentration of A is 5 M then concentration of B after 20 minutes is Re AIPMT 2015 1 0 36 M 3 1 08 M 2 0 72 M 4 3 60 M

How many oxygen atoms are shared in rest 3 options a Br 3h Br 1 Name the type of the structure of silicate in which one oxygen atom of SiO4 is shared a Sheet silicate Pyrosilicate c Three dimensional silicate d Linear chain silicate The correct IUPAC name of the compound is

3 0 401 mm 4 0 242 mm WO0063 64 A very thin transparent film of soap solution thickness 0 is seen under reflection of white light Then the colour of the film appear to be 1 blue 3 red 2 black 4 yellow WO0064 WHERECndan ETHER

In the module of consepts relating addition and substract ion in the 1 st question sir canceled 4 0 and 4 00 but if we see it by decimal place there is a difference in decimal pla ces so how is this possible

A uniform solid brass sphere is rotating with angular speed about a diameter If its temperature is now increased by 100 C what will be its new angular speed give a 2 0x10 C 1 1 100 2 1 01 0 3 0 996 0 4 0 824 0

Sir maam I think v hv to look fr destability of negative ch arge so as S is having d orbital so charge is stable n he nce OH is better nucleophile or We hv to look fr just electronegativity factor Which of the following is the strongest nucleophile X CH SH H O

W00046 3 1 1 st to the central following colour 53 In Young s double slit experiment if the width of the slits are in the ratio 4 9 the ratio of the intensity of maxima to the intensity at minima will be 2 81 16 1 169 25 3 25 1 4 9 4 W m 2 2 4 None of the above WO0052 W00047 WO0053

GR0018 9 The value of g reduces to half of its value at surface of earth at a height h then 1 h R 3 h 2 1 R 2 h 2R 4 h 2 1 R

2137 5 mx 0 13 x 500 25 or m 34 6 g Sample Problem 2 5 6 dm of an unknown gas at S T P requires 52 25 J of heat to raise temperature by 10 C at constant volume Calculate C C and atomicity of the gas

i e Z 1 and increases with increase in the value of P at corant T RT Sample Problem 1 Calculate the pressure exerted by 110 g of carbon dioxide in a vessel of 2 I capacity at 37 C Given that the van der Waals constants are a 3 59 L2 atm mol 2 and b 0 0427 E nol Compare the value with the calculated value if the gas were considered as ideal Solution According to van der Waals equation Thus

2 14 1 10 g of lead on heating gave 10 78 g of litharge PbO ii 9 775 g of red lead Pb304 yielded on strong heating 9 545 g of litharge iii 4 87 g of lead peroxide PbO gave on heating 4 545 g of litharge Show that these results illustrate the law of multiple proportions

1 g Mg was burnt in a closed vessel containing 2 g oxygen Which of the following are not correct 0 25 g of Mg will be left unburnt b 1 33 of O will be left unreacted a c 2 5 g of MgO will be formed d The mixture at the end will weigh 3g

49 If intensity of each wave in the observed interference pattern in Young s double slit experiment is I then for some point P where the phase difference is intensity I will be 1 1 1 cos 3 1 1 1 cos 2 1 1 cos 4 1 21 1 cos W00049

and dark we darker and bright 00046 central ng colour 52 53 WO0051 In Young s double slit experiment the two slits act as coherent sources of equal amplitude A and wavelength 2 In another experiment with the same set up the two slits are sources of equal amplitude A and wavelength but are incoherent The ratio of the intensity of light at the mid point of the screen in the first case to that in the second case is 1 4 1 3 1 1 Young s 2 2 1 4 None of the above WO0052 slitevperiment if the width of

Since this is a simple ratio so the above results establish the Law of Multiple Proportions Sample Problem 3 Two oxides of a metal contain 27 6 and 30 0 of oxygen respectively If the formula of the first oxide is M304 find that of the second Solution In the first oxide oxygen 27 6 metal 100 27 6 72 4 parts by mass Varam

Pre Medical Physics 97 249 A closed container is fully insulated from outside One half of it is filled with an ideal gas X separated by a plate P from the other half Y which contains a vacuum as shown in figure When P is removed X moves into Y Which of the following statements is correct X gas Y vacuum 1 No work is done by X 2 X decreases in temperature 3 X increases in internal energy

Solution Average atomic mass 34 97 x 0 755 36 97 x 0 245 35 46 Sample Problem 2 Naturally occurring Boron consists of two isotopes whose atomic masses are 10 01 and 11 01 The atomic mass of natural Boron is 10 81 Calculate the percentage of each isotope in natural Boron Solution Suppose the percentage of isotone with atomic mass 10 01 ge lle mass of chlorine

What is the balanced equation that leads to the macrocyclic ligand if the mixture was mixed with 9 mL ethylenediamine 140 cm3 acetone 17cm 50 tetrafluoroboric acid 30cm3 methanol for recrystallization Please provided it with balanced equation limiting agent and theoretical yield of the macrocylic ligand