General Questions and Answers

An evaporator is used to remove acetone from acetic acid 1500kg hr of mixture at unknown concentration runs through the evaporator yielding 500kg of vapour at 90 wt acetone If the evaporator has a 98 acetone removal efficiency find the concentrations of the influent and effluent streams

The dispersive powers of the materials of the two lenses are in the ratio 4 3 If the achromatic combination of these two lenses in contact is a convex lens of focal length 60 cm then the focal lengths of the component lenses are 1 20 cm and 25 cm 3 15 cm and 40 cm 2 20 cm and 25 cm 4 15 cm and 20 cm

1 0 025 N m 3 0 1 N m 2 0 0125 N m 4 0 05 N m FL0070 A liquid drop of diameter D breaks into 27 tiny drops The resultant change in energy is 1 2n TD 2 4x TD 3 TD 4 None of these 77

3 A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens Then its focal length will 1 Become zero 2 Become infinite 3 Become small but non zero 4 Remain unchanged

D 057 Oare ength 65 Two thin convex lenses of focal length 10 cm and 15 cm are separated by a distance of 10 cm The focal length of the combination is 1 4 2 cm 2 6 cm 3 10 cm 4 15 cm

69 A plano convex lens u 1 5 has radius of curvature 10 cm It is silvered on its plane surface Find focal length after silvering 1 10 cm 2 20 cm 3 15 cm 4 25 cm 2 f 25 3 f f 4 f 25 M

Condiser the following solutions or compounds ii HCI in aq solution iv NH3 9 Total number of cases where ion dipole interaction is present x Total number of cases where hydrogen bonding is present y Total number of cases where only London dispersion forces are present z vy Z i He g O2 g iii NaCl in aq solution The value of is

principal focus Then focal length of lens is 1 9 cm 2 25 cm 3 15 cm 4 17 cm GO0063 A glass convex lens 1 5 has a focal length of 8 cm when placed in air What would be the focal length of the lens when it is immersed in water 1 33 1 2 m 2 4 cm 3 16 cm 4 32 cm

Chemistry 50 51 52 53 54 55 56 57 58 59 60 4 X 1 English 3 4 gm H 02 is present in its 112 ml solution Volume strength of this solution is Question Type Single Correct Type 1 0 224 V 2 20 V 00 00 34 3 5 V 02 59 21 4 10 V Review Q

7 Bernoulli s equation for steady non viscous in compressible flow expresses the 1 Conservation of angular momentum 2 Conservation of density 3 Ca tun

7 The cylindrical tube of a spray pump has a radius R one end of which has n fine holes each of radius r If the speed of flow of the liquid in the tube is v the speed of ejection of the liquid through the hole is 1 3 R R nr 4 n

3 Dalton s law 4 Boyle s law FL0042 43 A body measures 5 N in air and 2 N when put in water The buoyant force is 1 7 N 3 3 N 2 9 N 4 None of these

3 25 cm 4 25 cm GO00 60 A convex lens of Focal length of 40cm is in cont with a concave lens of focal length 25cm The po of the combination is 1 1 5 D 3 6 5 D 2 6 5 D 4 6 67 D C000

If the experiment were repeated with the following combinations of citric acid and sodium bicarbonate which reaction A or B would inflate the balloon the most Show calculations that support your claim Reaction A Moles of HyCH O Grams of NaHCO 4 2 g 0 010 mol B 0 025 mol 2 1 g

W2 0 6 mL of acetic acid CH COOH having density 1 06 g mL is dissolved in 1 litre of water The depression in freezing point observed for this strength of acid was 0 0205 C Calculate the van t Hoff factor and the dissociation constant of acid 00

ver 44 45 46 4 In the balanced equation 17 5BIO X Y is Question Type Single Correct Type 2 10 3 12 4 00 00 24 47 48 49 50 51 52 53 52 English Review 16 02 59 31 XH Y Mn2 5B1 7H 0 2MnO4 53 54

9 Lenses of powers 3D and 5D are combined to form a compound lens An object is placed at a distance of 50 cm from this lens Calculate the position of its image 1 10 cm 3 25 cm 2 10 cm 4 25 cm

tion is gle of 0030 37 GO0036 Relation between critical angles of water and glass is 1 C C 3 C C 2 C C 4 C C 0

17 Hands rule explain a An orbital can have maximum two electrons with opposite spin b orbitals are filled in order of their increasing energy c pair of electrons does not occur in orbitals of the same subshell until each of ther firstly singly occupied d None of these

od m 61 An object is put at a distance of 5 cm from the first focus of a convex lens of focal length 10cm If a real image is formed it s distance from the lens will be 1 15 cm 2 20 cm 3 25 cm 4 30 cm

A sphere is floating in water its 1 3rd part is outside the water and when sphere is floating in unknown liquid its th part is outside the liquid then density of liquid is 1 4 9 gm c c 3 8 3 gm c c 2 9 4 gm c c 4 3 8 gm c c

FL0035 6 A piece of ice is floating in a jar containing water When the ice melts then the level of water 1 Rises 2 Falls 3 Remains unchanged 4 Changes erratically

34 FL0033 If the density of a block is 981 kg m then it shall 1 Sink in water 2 float with some part emmersed in water 3 float completely immersed in watere 4 float completely out of water the liq of 12 37

PRISM DISPERSION 43 The angle of a glass prism is 4 5 and its refractive index is 1 52 The angle of minimum deviation will be 1 1 5 2 2 3 3 4 5 4 2

19 The mean distance between the atoms of iron is 3x10 10 m and inter atomic force constant for iron is 7 N m The young s modulus of elasticity for iron is 1 2 33x 10 N m 3 233 x 100 N m 2 23 3 x 10 0 N m 4 2 33 x 10 0 N m FL0019 16

0 Cross section area of a steel wire Y 2 0 x10 N m is 0 1 cm The required force to make its length double will be 1 2 x 10 N 3 2 x 10 N 2 2 x 10 N 4 2 x 10 N

27 A microscope is focused on a mark then a glass slab of refractive index 1 5 and thickness of 6 cm is placed on the mark to get the mark again in focus the microscope should be moved 1 4 cm 2 2 cm 3 6 cm 4 8 cm

272 25 Pre Medical Physics An increases in pressure required to decreases the 200 litres volume of a liquid by 0 004 in container is Bulk modulus of the liquid 2100 MPa 1 188 kPa 3 18 8 kPa 2 8 4 kPa 4 84 kPa

1 1000 and s 1mm The S 4 168 N FL0014 wire of length 3 2 10 N 4 2 x 10 N FL0020 21 For a given material the Young s modulus is times that of rigidity modulus Its Poisson s 1 2 4 2 1 2 3 0 4 4 0 2 FL0021

en in ade e 15 ase 22 The diameter of a brass rod is 4 mm and Young s modulus of brass is 9 x 100 N m The force required to stretch by 0 1 of its length is 1 360 N 2 36 N 3 1447 10 N 4 36m x 10 N FL0022

13 Amass of 0 5 kg is suspended from wire then length of wire increase by 3 mm then find out work done 1 4 5 10 J 2 7 3 x10 J 3 9 3 102 J 4 2 5 x 10 J 14 FL0013

0015 stance image mirror 0016 is of a 22 GO0021 A point object is placed at a distance of 10 cm and its real image is formed at a distance of 20 cm from a concave mirror If the object is moved by 0 1 cm towards the mirror the image will shift by about 1 0 4 cm away from the mirror 2 0 4 cm towards the mirror 3 0 8 cm away from the mirror 108 toun th mirror

11 Two wires of the same material and length but diameters in the ratio 1 2 are stretched by the same force The potential energy per unit volume for the two wires when stretched will be in the ratio 1 16 1 3 2 1 2 4 1 4 1 1

The load versus elongation graph for four wires of the same material and same length is shown in the figure The thinnest wire is represented by the line 1 OA 2 OB 3 OC 4 OD peo elongation

ALLEN Build Up Your Understanding If the density of the material increase the value of Young s modulus 1 increases 2 decreases 3 first increases then decreases 45

If 0 7 g of H O2 is added to 100 g of ethylene to establish the degree of polymerization what would be the resulting average molecular length coiled Assume that all H dissociates to OH groups that serve as terminals for the molecules Express your answer to three significant digits AEO vec

M 49 gram of a sample of oleum containing 20 free SO3 was neutralized by 10 required for neutralization is NaOH The volume of NaOH in litre

5 a 28 A compound contains 6 72 hydrogen 40 carbon and 53 28 oxygen its molecular mass is 180 18 g mol then molecular formula of compound is 1 C H O 3 CH 012 2 C H O12 4 CH 206 12 OULE 111 SOME BASIC CONCEPTS OF CHE MC0196

1 0 5 e 2 1 0 e 3 1 5 e 4 2 0 e FL0015 How much force is required to produce an increase of 0 2 in the length of a brass wire of diameter 0 6 mm Young s modulus for brass 0 9 x 10 N m 1 Nearly 17 N 2 Nearly 34 N 3 Nearly 51 N 4 Nearly 68 N FL0016 23 1 360 3 144 Poisson 1 0 1 24 Two w differer

pe and size FL0001 nd of weight roof and a r end If s is The stress in er end is 6 irst increases 4 first decreases then increases ecreases FL0005 A fixed volume of iron is drawn into a wire of length The extension produced in this wire by a constant force F is proportional to 1 3 4 FL0006

2 A square of side 3 cm is placed at a distance of 25 cm from a concave mirror of focal length 10 cm The centre of the square is at the axis of the mirror and the plane is normal to the axis The area enclosed by the image of the wire is 1 4 cm 2 6 cm 3 16 cm 4 36 cm INSTRUMENT PERCEP

The Young s modulus of a rubber string 8 cm long and density 1 5 kg m is 5x10 N m is suspended on the ceiling in a room The increase in length due to its own weight will be 1 9 6 x 10 m 3 9 6 x 10 m 2 9 6 x 10 m 4 9 6 m FL0008 D MECHANICSOPROPERTIES OF MATTER AND FLUID

16 A boy stands straight infront of a mirror at a distance of 30 cm away from it He sees his erect image whose height is 1 5th of his real height The mirror he is using is 1 Plane mirror 3 Concave mirror 2 Convex mirror 4 None n 22 2 C E

3 9 3 10 J 4 2 5 x 10 J FL0013 14 If the strain in a wire is not more than 1 1000 and Y 2x10 1 N m Diameter of wire is 1mm The maximum weight hung from the wire is 1 110 N 2 125 N 3 157 N 4 168 N FL0014 20 21

15 An object of height 1 5 cm is situated at a distance of 15 cm from a concave mirror The concave mirror forms its real image of height 3 0 cm The focal length of concave mirror will be 1 10 cm 2 20 cm 3 20 cm 4 30 cm

GO0013 14 An object is lying at a distance of 90 cm from a concave mirror of focal length 30 cm The position and nature of image formed by it will be 1 45 cm of the size of object 2 90 cm smaller than object 3 30 cm bigger than object 4 45 cm smaller than object

DEL 3 O CH4 g 2Cl2 g CH Cl2 1 2HCl g 4 Xe g 2F2 g XeF4 s F ARE SAM E For which one of the following is AH reaction equal to AHf for the product Options 1 O 200 g O2 g 2CO2 g 2 N2 g 03 g N203 g

The boiling point of 0 001 M aqueous solutions of NaCl Na2SO4 K3PO4 and CH3COOH should follows the order A CH3COOH NaCl Na2SO4 K3PO4 B NaCl Na2SO4 K3PO4 CH3COOH C CH3COOH K3PO4 Na2SO4 NaCl D CH3COOH K3PO4 NaCl Na2SO4

An object of height 7 5 cm is placed in front of a convex mirror of radius of curvature 25 cm at a distance of 40 cm The height of the image should be 1 2 3 cm 2 1 78 cm 3 1 cm 4 0 8 cm

18 A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it For the image to be real the focal length should be 1 10 cm 2 15 cm 3 20 cm 4 30 cm