General Questions and Answers

157 When a particle is thrown horizontally the resultant velocity of the projectile at any time t is given by 1 gt 3 u g t 2 gt KN0158

KN016 160 A plane is flying horizontally at 98 m s and releas an object which reaches the ground in 10 s T angle made by it while hitting the ground is 1 55 2 45 3 60 4 75

range R for two 154 Two projectiles are fired from the same point with the time of flight the same speeds at angles of projection 60 and 30 respectively Which one of the following is true R 1 R KN0148 from the ground thrown at 60 to a haight attained 1 Their horizontal ranges will be the same 2 Their maximum heights will be the same 3 Their landing velocities will be the same 4 Their times of flight will be the same KN0155

146 Pre Medical Physics 145 A ball whose kinetic energy is E is thrown at an angle of 45 to the horizontal Its kinetic energy at the highest point of its flight will be 1 E E 2 3 WIN 4 zero KN0146 152 For is de 1 H 3 E

147 The root mean square velocity of hydroger molecules at 300 K is 1930 m s Then the r m s velocity of oxygen molecules at 1200 K will be 1 482 5 m s 2 965 0 m s 3 1930 m s 4 3860 m s HT0162

HT0149 137 The volume of an ideal gas is V at pressure P and temperature T The mass of each molecule of the gas in m The density of gas will be 1 K is Boltzmann s constant 1 mKT 2 Pm KT

Tin forms two chlorides compound A and compound B Mass percentage of tin in these chlorides are 62 63 and 45 6 respectively Select the incorrect statement Given data Atomic mass of Sn is 119 amu and Cl is 35 5 amu Given data illustrates law of multiple proportion Mole ratio of chloride in compound A to compound B is 1 2 X Mole ratio of tin in compound A to compound B is 1 1 Equivalent weight of tin is same in both compounds

KN0148 148 A body is thrown with some velocity from the ground Maximum height attained when it is thrown at 60 to the horizontal is 90 m What is the height attained when it is thrown at 30 to the horizontal 1 90 m 2 45 m 3 30 m 4 15 m 15

88 Pre Medical Physics 144 The rms velocity of gas molecules of a given amount 15 of a gas at 27 C and 1 0 x 10 N m pressure is 200 m sec If temperature and pressure are respectively 127 C and 0 5 x 105 N m the rms velocity will be 1 400 3 ms 2 100 2 mst

KN0150 PROJECTION FROM A HEIGHT ticle of mass 156 A body is thrown horizontally with a velocity 2gh e particle at was at rest from the top of a tower of height h It strikes the ground level through the foot of the tower at a distance x from the tower The value of x is 2 1 h 3 2 h 3050 2 h fla 2 4 3 03 EXERCISES

2 1 E 4 zero KN0146 146 A body is projected at such an angle that the horizontal range is three times the greatest height The angle of projection is 1 25 2 33 3 NIM 42 4 53 KN0147 3 153 A b If th 1 1

HT0157 3 At constant pressure hydrogen is having temperature of 327 C Till what temperature it is to be cooled so that the rms velocity of its molecules becomes half of the earlier value 1 123 C 2 123 C 3 100 C 4 0 C

148 The rms velocity of H is 2 x 10 m s What will be the rms velocity of O molecules at the same tem perature 1 10 m s 3 0 5 x 10 m s 2 500 m s 4 3 x 10 m s HT0163

45 Two containers of same volume are filled with atomic Hydrogen and Helium respectively at 1 and 2 atm pressure If the temperature of both specimen are same then average speed C for hydrogen atoms will be 1 CH 2 C 2 CH C 3 CH 2 CH 4 C C 2 152

If the range of a gun which fires a shell with muzzle speed v is R then the angle of elevation of the gun is 1 cos 3 zsin V Rg V Rg 2 cos 4 sin Rg Rg KN0139

same eights 139 The maximum range of a projectile fired with some initial velocity is found to be 1000 m The maximum height H reached by this projectile is 2 500 metre 4 2000 metre 1 250 metre 3 1000 metre

3 Four times 4 None of the above HT0166 151 The reason for the absence of atmosphere on moon is that the 1 Value of v of the molecules of gas is more than the value of escape velocity 2 Value of v of gas is less than escape velocity 3 Value of vis negiligible 4 None of the above HT0167

His colleagues have considered the use of the frying oil used in the elaboration of other products eg soap and decided to compare two different oils corn and sunflower when they are not used 1 and after used for frying 2 Some of the results for three samples of each oil are summarized in the table in the image Assuming both oils were used equally for frying and considering what you learned in the course indicate the oil in which glycerol is esterified to longer carbon chains OIL Acid number mg KOH pr g fat saponification index mg KOH g fat Corn 1 Corn 2 0 413 0 581 0 611 0 886 0 567 0 834 111 133 114 120 128 138 Sunflower 1 Sunflower 2 1 1 363 1 239 148 133 140 1 944 1 976 1 822 163 148 161

136 At what angle to the horizontal should a ball be 142 The maxi thrown so that its range R is related to the time of 10 flight T as R5T Take g 10 ms 1 30 3 60 2 45 4 90 KN0137 07 20 must be 1 1600 3 200

Given 1066 diva Fe aq e Fe aq E 0 77 V O A1 aq 3e Al s E 1 66 V Br aq 2e 2Br E 1 09 V Considering the electrode potentials which of the following represents the correct order of reducing power a Fe Al Br 8 Br Fe Al c Al Br Fe2 Al Fe Br utraction of 1

A 1 00M NaOH B 1 10M HCI C 1 10 M HNO T T DT T T NaOH and HCI 22 0 28 70 NaOH and HNO 22 5 29 2 2 Heat of dissolution DHdiss of some salts Substance DHdiss J g Specific heat mass gT NH C 271 9 0 506 Jg K 5 00 25 0 16 0 T DT Na CO H O 222 0 0 840 Jg K 5 00 4 184 Jg K 20 0 27 5

The molar heat capacities at constant pressure assume constant with respect to temperature of A B and C are in ratio of 1 5 3 0 2 0 If enthalpy change for the exothermic reaction A 2B 3C at 300 K is 10kJ mol Cp m B is 300 J mol then enthalpy change at 310 K is A B D 8 5 kJ mol 8 5 kJ mol 11 5 kJ mol none of these

126 A projectile is thrown from a point in a horizon plane such that its horizontal and vertical velo components are 9 8 m s and 19 6 m s respective Its horizontal range is 1 4 9 m 3 19 6 m 2 9 8 m 4 39 2 m

HT0145 133 A cylinder contains 10 kg of gas at pressure of 10 N m When final pressure is reduce to 2 5 x 10 N m then quantity of gas taken out of the cylinder will be temperature of gas is constant 1 15 2 kg 3 zero 2 3 7 kg 4 7 5 kg 139

uble y of 127 A projectile is thrown into space so as to have the maximum possible horizontal range equal to 400m Taking the point of projection as the origin the coordinates of the point where the velocity of the projectile is minimum are 1 400 100 m 2 200 100 m 3 400 200 m 121 1x

A particle is projected at an angle of 45 8m away from the foot of a wall just touches the top of the wall and falls on the ground on the opposite side at a distance 4m from it The height of wall is 1 m 21 413 E 3 013 8 E 4 3 All KN0142

129 O gas is filled in a cylinder When pressure is increased 2 times temperature becomes four times then how much times their density will become 2020 2 4 4 NI

116 The speed of a projectile at its maximum height 3 is times of its inital speed u of projection Its range on the horizontal plane is 3u 3u 2g 2g 1 2 29 3 3u 9 10

122 During an experiment an ideal gas obeys an addition equation of state P2V constant The initial temperature and volume of gas are T and V respectively When it expands to volume 2V then temperature will be 2 2 T its 1 T 3 2T 4 2 2 T

124 IfR is the maximum horizontal range of a particle then the greatest height attained by it is 1 R 2 2R RIN 3 2 KNO125 sion 20 131

T0117 rate of hen the t energy 116 Two gases of equal molar amount are in thermal equilibrium If P P and V V are their respective pressures and volumes then which relation is true 1 RP V V 2 V V V V 3 N P N 4 P V P V

Van Arkel method of purification of metal involves converting the metal to a B C D Volatile less stable compound Non volatile stable compound Volatile stable compound None of the above

Part B Select the answer that correspond to the correct way to read a graduated cylinder H the meniscus should be read at the very top or very bottom of the curve based on its upper or lower curvatu read graduated cylinder from bench level fill graduated cylinder with a given amount of a liquid always read the graduated cylinder at eye level Ensure that it is clean and in good condition always read water level from the bottom of the meniscus fill the graduated cylinder with only water

Which of the following pairs have identical value of e m 1 A proton and a neutron 3 Deuteron and an a particle 2 A proton and deuteron 4 An electron and y rays that

To practice let us read and reorganize this diary entry written by Manoj Dear Diary 1 However my parents had to stay in Delhi for work As luck would have it my father tested positive for Covid 19 Though he recovered but he still has weakness 2 My summer vacations are over and online studies have re started 3 During the summer vacation my sister and I left for our village as Corona cases had increased in Delhi 4 I am looking forward to meet and talk with my friends and teachers during online classes 5 We returned to Delhi on 30th June although many of our neighbors haven t come back from their villages yet 6 See you tomorrow diary Name Day Now lot na ito Mancila diom by noordering Date ore meaningful contongos The formet hog alvoody

120 A projectile is thrown with an initial veloci vai bj If range of the projectile is de the maximum height attained by it then 1 a 2 b 2a 3 b 2 b a 4 b 4a

3 A shell is fired vertically upwards with a velocit v from the deck of a ship moving with a spee V A person on the shore observes the motion a the shell as a parabola Its horizontal range is give by 1 3 2v v 9 2v Vz 9 2 4 2v v 9 2v v 9

L 3 b 2a 4 b 4a KN0121 1 The equation of a projectile is y 3x The angle of projection is 1 30 2 60 3 45 gx 2 4 none KN0122 proje 1 4 2 25 3 4 4 2 128 A par

KN0111 GROUND TO GROUND PROJECTION 111 In the graph shown in fig time is plotted along x axis Which quantity associated with a projectile motion is plotted along the y axis 1 kinetic energy 2 momentum 3 horizontal velocity 4 none of the above quantity

Number of electrons ejected from a metal surface during photoelectric effect depends on O Intensity of incident light Wavelength of incident light O Frequency of incident light O Energy of incident light

KN0110 110 A car accelerates from rest at a constant rate of 2 m s for some time Then it retards at a constant rate of 4 m s and comes to rest If it remains in motion for 3 seconds then the maximum speed attained by the car is 1 2 m s 3 4 m s 2 3 m s 4 6 m s KNOLL

t A When reading a graduated cylinder reading the water level correctly is important Explain what a meniscus is and why it is important when reading a graduated cylinder ssay answers are limited to about 500 words 3800 characters maximum including spaces 3800 Character s remaining

Which among the following is an incorrect statement about canal rays Canal rays are positively charged gaseous ions in discharge tube The charge to mass ratio of canal rays O depends on the gas from which these originate O Canal rays may carry a multiple of the fundamental unit of electrical charge O Canal rays originate from anode surface

In solar spectrum fraunhoffer s lines are presents because 1 Definite absorption takes place in photosphere of sun 2 Definite absorption takes place in chromosphere of sun 3 These wave lengths are not at all emitted by sun 4 Nuclear reactions take place in sun

1 30 2 60 100 100 3 45 122 The equation of a projectile is y 16x horizontal range is 1 16 m 2 8 m 18 4 none KN0122 3 64 m 4 The 4 12 8 m KN0123 128 A pa with whes 3 u 129 In th

ALLEN 109 A particle starts from rest Its acceleration at time t 0 is 5 m s which varies with time as shown in the figure The maximum speed of the particle will be a 5 m s 1 7 5 m s 2 15 m s 3 30 m s

18 A student is able to throw a ball vertically to a maximum height of 40 m The maximum distance to which he can throw the ball in the horizontal direction is 1 40 2 m 3 20 m 2 20 2 1 2m 4 80 m

Part C Using a buret is similar to using a graduated cylinder List at least 3 difference between how you measure a liquid sample from a buret versus a graduated cylinder Essay answers are limited to about 500 words 3800 characters maximum including spaces 3800 Character s remaining

KN011 117 A ball is thrown at an angle 9 to the horizontal and the range is maximum The value of tane is 2020 21 2 3 1 3 3 4 2 KN0118

Pre Medical Physics 141 0 The displacement time graph of a moving particle is shown The instantaneous velocity of the particle is negative at the point displacement of C E time