General Questions and Answers

AgCl The solubility product of AgCl is 2 8 x 10 10 The concentration of Ag ions in a saturated solution of Ag C O4 is 2 2 x 104 M Calculate the solubility of Ag C O4 in a solution which is 0 1 M in Na C O4 The solubility product of lead bromide is 4 106 Find the solubility of the salt in mixed with 50 mL of 2 0 10 M NaF Thef CaF

82 Energy is being emitted from the surface of black body at 127 C at the rate of 1 0 x 106J s m The temperature of black body at which the rate of energy is 16 0 x10 J s m will be 1 754 C 3 254 C 2 527 C 4 508 C

Given below are two statements One is labelled as Assertion A and the other is labelled a Reason R Assertion A Sharp glass edge becomes smooth on heating it upto its melting point Reason R The viscosity of glass decreases on melting Choose the most appropriate answer from the options given below 1 A is false but R is true 2 Both A and R are true and R is the correct explanation of A 3 Both A and R are true but R is NOT the correct explanation of A 4 A is true but R is false

80 The ideal black body is HT0087 1 Hot coal at high temperature 2 Surface of glass printed with coaltar 3 Metal surface 4 A hollow container painted with black colour 85

1 2 1 2 4 1 3 8 1 56 Two bars of thermal conductivities K and 3K and lengths 1 cm and 2 cm respectively have equal cross sectional area they are joined length wise as shown in the figure If the temperature at the ends of this composite bar is 0 C and 100 C see figure then the temperature of the interfa d is ctively 61 0 C K 1 cm 1 50 C 3 60 3K 2 cm 100 2 3 200 3 4 16 1 HT0061 C Session 100 C 2 Fig 61 RAD 62

3 30 m s 4 40 m s KN006 65 A stone is dropped from a certain height which ca reach the ground in 5 seconds It is stopped after seconds of its fall and is again released The total tim taken by the stone to reach the ground will be 1 6 s 2 6 5 s 3 7 s 4 7 5 s

3 Metal has low specific heat 4 Metal has low thermal conductivity HT0060 55 The ratio of the diameters of two metallic rods of the same metarial is 2 1 and their lengths are in the ratio 1 4 If the temperature difference between them are equal the rate of flow of heat in them will be in the ratio of 1 2 1 2 4 1 3 8 1 4 16 1 60 2 boilin 3 heatin bulb 4 air ard In natura moves ba 1 Its m 2 Of m

54 On a cold morning a person will feel metal surface colder to touch than a wooden surface because 1 Metal has high specific heat 2 Metal has high thermal conductivity 3 Metal has low specific heat 4 Metal has low thermal conductivity 50

Three rods made of the same material and having the same cross section have been joined as shown in the figure Each rod is of the same length The left and right ends are kept at 0 C and 90 C respectively The temperature of the junction of the three rods will be 1 45 C 0 C 2 60 C 90 C 90 C 3 30 C 4 20 C HT0044

In lassaigne s test h2o is not used anywhere so how does solubility of agf in h2o makes it undetectable 64 F cannot be tested by Lassaigne s test because 1 F is highly reactive 2 AgF is soluble in H O SVINCE 3 F is more electronegative 11

KN006 56 With what speed should a body be thrown upward so that the distances traversed in 5th second an 6th second are equal 1 58 4 m s 3 98 m s 2 49 m s 4 98 m s KN006

ve same nd cross What is nduction A 50 If the coefficient of conductivity of aluminium is 0 5 cal cm sec C then in order to conduct 10 cal sec cm in the steady state the temperature gradient in aluminium must be 1 5 C cm 3 20 C cm 2 10 C cm 4 10 5 C cm HT0056

9 A body falling from height h takes t time to reach the ground The time taken to cover the first half of the height is 1 42 7 2 3 1 31 2 4 2 4 None of these KN0059 CE BA ARGETPHYENG MODET

A particle moves along X axis in such a way that its coordinate x varies with the time t according to the expression x 2 5t St then A distance covered by the particle during t 0 to t 1 sec is 2m B distance covered by the particle during t 0 to t 1 sec is 4 m C distance covered by the particle during t 0 to t 1 sec is 0 m D distance covered by the particle during t 0 to t 1 sec is 2 5 m

3 Under steady state the temperature of a body 1 Increases with time 2 Decreases with time 3 Does not change with time and is same at all the points of the body 4 Does not change with time but is different at different points of the body

ht to ation 55 A stone falls from a balloon that is descending at a uniform rate of 12 ms The displacement of the stone from the point of release after 10 seconds is g 9 8 m s 1 490 m 2 510 m

Pre Medical Physics 79 uct 47 Consider a compound slab consisting of two different the materials having equal thicknesses and thermal conductivities K and 2K respectively The equivalent thermal conductivity of the slab is 1 3K 4 2 K 2K 3 K 4 K

A stone thrown upwards with a speed u from th top of the tower reaches the ground with a veloci 3u The height of the tower is 3u 9 2g v KN005 2 4u 9

58 A body dropped from the top of a tower covers a distance 7x in the last second of its journey where x is the distance covered in first second How much time does it take to reach the ground 1 3s 2 4s 3 5s 4 65 CS03EROSE PAS

39 ha on 00 at a C 1 45 C 2 60 C 3 30 C 4 20 C HT0044 40 The coefficient of thermal conductivity depends upon 1 Temperature difference of two ends 2 Area of the plate 3 Thickness of the plate 4 Material of the plate

KN006 52 If an iron ball and a wooden ball of same radii an released from a height h in vacuum then time taker by both of them to reach ground will be 1 unequal 2 exactly equal 3 roughly equal 4 zero

Pre Medical Physics 135 The velocity acquired by a body moving with uniform acceleration is 30 m s in 2 seconds and 60 m s in 4 seconds The initial velocity is 1 zero 2 2 m s 3 4 m s 4 10 m s

40 L ant ands 47 KN0046 Initially a body is at rest If its acceleration is 5ms then the distance travelled in the 18th second is 1 86 6 m 2 87 5 m 3 88 m 4 89 m KN0047

1 20 C 2 30 C 3 35 C 4 40 C HT0036 34 The ratio of coefficient of thermal conductivity of two different materials is 5 3 If the thermal resistance of rods of same area of these material is same then what is ratio of length of these rods 1 3 5 2 5 3 3 25 9 4 9 25 HT0038 ion

HT0038 5 Rate of heat flow through a cylindrical rod is Q Temperatures of ends of rod are T and T If all the linear dimensions of the rod become double and temperature difference remains same it s rate of heat flow is Q then 1 Q 2Q 3 0 40 2 Q 2Q 4 0 40 le TE th

10 Equation of a particle moving along the x axis is x u t 2 a t 2 1 the initial velocity of the particle is u 2 the acceleration of the particle is a 3 the acceleration of the particle is 2a 4 at t 2 particle is not at origin KN0040 46 A bo accele next total c 1 10 3 50

T0003 plot of ius and 8 The figure below shows four isotropic solids having positive coefficient of thermal expansion A student predicts that on heating the solid following things can happen Mark true T or False F for comments made by the student O O AJ i The angle a in figure 1 will not change ii The length of line in figure 2 will decrease iii The radius of inner hole will decrease ssion 2020 iv The distance AB will increase 1 TFFT 2 FTTF 3 TTTT 4 FFTF

Agl Ag PO4 Na CrO4 and K Cr O are all coloured Different concepts are used to explain colour of compounds In which of following sets compounds are differently coloured but same concept is used to explain colour 1 Ag PO and Agl 2 Na CrO and Ag PO4 4 3 K Cr O and Na CrO4 4 All of Agl A PO

HT0006 Two thermometers X and Y have ice points marked at 15 and 25 and steam points marked as 75 and 125 respectively When thermometer X measures the temperature of a bath as 60 on it what would thermometer Y read when it is used to measure the temperature of the same bath 1 60 2 75 3 100 4 90

Om s 0041 48 KN0047 If a body starts from rest and travels 120m in the 8th second then acceleration is 1 16 m s 3 0 227 m s 2 10 m s 4 0 03 m s KN0048

HT0003 The graph AB shown in figure is a plot of temperature of a body in degree Celsius and degree Fahrenheit Then 100 C Centigrade A a 32 F 212 F Fahrenheit 1 slope of line AB is 9 5 2 slope of line AB is 5 9 3 slope of line AB is 1 9 4 slope of line AB is 3 9 6 HT0004 The nigu positive c predicts Session 2020 9 can happ made by i The am ii The la iii The r iv The c 1 TFF At STP figure le floor The upto 35

reases by 0 15 d by 24 C The metal is x10 C x 10 5 C HT0011 ALLEN 16 A bullet moving with velocity v collides against wall consequently half of its kinetic energy is converted into heat If the whole heat is acquired by the bullet the rise in temperature will be 1 v 4S 2 4v 2S 3 v 2S 4 v S HT0018

KN0042 43 If a body starts from rest the time in which it covers a particular displacement with uniform acceleration is 1 inversely proportional to the square root of the displacement 2 inversely proportional to the displacement 3 directly proportional to the displacement 4 directly proportional to the square root of the displacement KN0043

is 19 Two identical masses of 5 kg each fall on a wheel from a height of 10m The wheel disturbs a mass of 2kg water the rise in temperature of water will be 1 2 6 C 2 1 2 C 3 0 32 C 4 0 12 C 20

KN0051 52 If a car at rest accelerates uniformly and attains a speed of 72 km h in 10s then it covers a distance of 53 1 50 m 3 200 m 2 100 m 4 400 m KN0052 A stone is dropped into a well in which the level

76 10 Pre Medical Physics The volume of a metal sphere increases by 0 15 16 when its temperature is raised by 24 C The coefficient of linear expansion of metal is 1 2 5 x 10 5 C 2 2 0 x105 C 3 1 5 x 105 C 4 1 2 x 10 C HT0011 A bullet mot consequent into heat If the rise in t 1 v 4S 3 v 25

9 h 9 is 202 one of the above KN0044 If a car at rest accelerates uniformly to a speed of 144 km h in 20 seconds it covers a distance of 1 20 m 2 400 m 3 1440 m 4 2980 m KN0045

A3 A4 10 in 15 2 5 2 A 50 20 3 4 3 A 1 A 4 A HT0014 13 An iron bar Young s modulus 10 1 N m a 10 6 C 1 m long and 10 3 m in area heated from 0 C to 100 C without being allowed to bend or expand Find the compressive force developed inside the bar 1 10 000 N 3 5000 N 2 1000 N 4 105 N 19 20

41 The velocity of a particle moving with constant acceleration at an instant t is 10m s After 5 seconds of that instant the velocity of the particle is 20m s The velocity at 3 second before to is 1 8 m s 2 4 m s 3 6 m s 4 7 m s KN0041 48 ther 1 3 If a 8th 1 3

10 00 3 5000 N 2 4 105 N HT001 14 A rod of length 2m rests on smooth horizontal floo If the rod is heated from 0 C to 20 C Find th longitudinal strain developed a 5 x 10 5 C 1 10 3 3 Zero 2 2 10 4 None TOO

3 The velocity of a body depends on time according to the equation v 20 0 11 The body has 1 uniform acceleration 2 uniform retardation 3 non uniform acceleration 4 zero acceleration 10025 1 velocity is constan 2 acceleration is com 3 acceleration is va 4 None of these 35 A body is moving h12

3 slope of line AB is 1 9 4 slope of line AB is 3 9 HT0004 Oxygen boils at 183 C This temperature is approximately in Fahrenheit is 1 329 F 2 215 F 2 261 F 4 297 F HT0005 1 The roc 2 If ad 3 If a rod

0 2 The table gives the initial length o change in temperature AT and change in length Al of four rods Which rod has greatest coefficient of linear expansion 1 A Rod m AT C A m A1 1 A2 2 A3 A4 1 1 15 25 2 A 100 100 50 20 3 4 3 A 4 A

E 028 by and 029 2 acceleration is constant 3 acceleration is variable 4 None of these KN0034 35 A body is moving according to the equation x at bt ct Then its instantaneous speed is given by 1 a 2b 3ct 2 a 2bt 3d 3 2b 6ct 4 None of these KN0035

32 The relation t x 3 describes the position of a particle where x is in meters and t is in seconds The position when velocity is zero is 2 4 m 4 zero 1 2 m 3 5 m 20 21 KN0032

25 The position x of a particle varies with time t as x at bt The acceleration at time t of the particle will be equal to zero where t is equal to 1 2a 3b 2 11 0 3 a 3b 4 zero KN0025 3 32 Th E pa Th

4 equal to or greater than one KN0018 9 A particle moves in a straight line for 20 seconds with velocity 3m s and then moves with velocity 4 m s for another 20 seconds and finally moves with velocity 5 m s for next 20 seconds What is the average velocity of the particle 1 3 m s 2 4 m s 3 5 m s 4 zero KN0019

Groundwater containing 0 0004 M of DDT molecular weight 354 5 g mol is added to a silt loam soil with 4 organic carbon content and has a density of 1 2 g cm Calculate the concentration of DDT in g kg that is sorbed to soil at equilibrium using Koc 1 13 x 105 remember 1 L 1000 cm

4 X English O Mark for review A radioactive showing of c14 activity 20 Calculate its activity in C after sample curie 12000 yrs t1 2 of C14 6000 yr Question Type Integer Type

26 A particle moves along a straight line such that its displacement at any time t is given by s t 6t 3t 4 metres The velocity when the acceleration is zero is 1 3 m s 2 12 m s 3 42 m s 4 9 m s