General Questions and Answers

RGE S 1 Force between two identical spheres charged with same charge is F If 50 charge of one sphere is transferred to the other sphere then the new force will be 1 m Al 3 2 F F LL 0000 4 none of these ES0004

198 A river 4 0 miles wide is flowing at the rate o 2 miles hr The minimum time taken by a boat t cross the river with a speed v 4 miles hr in sti water is approximately 1 1 hr and 0 minute 2 2 hr and 7 minutes 3 1 hr and 12 minutes 4 2 hr and 25 minutes KN0195

plz explain all the forces like dipole vanderwall in all of th em acting before and after mixing Which of the following is low boiling azeotropic mixture C6H6 CHCl3 H O HCl CHCI CH COOH ve deviation from

Consider a neutral conducting sphere A positive point charge is placed outside the sphere The net charge on the sphere is then 1 negative and distributed uniformly over its surface 2 negative and appears only at the point on the sphere closest to the point charge 3 negative and distributed non uniforme SIC its entire surface of the sphere 4 zero Se ES0007

180 A motorcycle is moving with a velocity of 80 km h ahead of a car moving with a velocity of 65 km h in the same direction What is the relative velocity of the motorcycle with respect to the car 1 15 km h 3 25 km h 2 20 km h 4 145 km h KN0181

91 CF from aq A solution is a mixture of 0 06 M KCl and 0 06 M KI AgNO solution is being added drop by drop till AgCl starts precipitating K AgCl 1x 10 0 and K Agl 4 x 10 16 The concentration of lodide ion at this stage will be nearly equal to sp 1 4 0 x 10 5 M 2 2 4 x 10 7 M 4 4 x 10 8 M 3 2 0 x 10 8 M tod as As S and not

ueous equal cid of has 128 0 001 mol of the strong electrolyte M OH been dissolved to make a 20 mL of its saturated solution Its pH will be K 1 10 4 4 9 8 2 3 3 1 13 3 11 Choose the wrong statement

is added in 1 1 2 0 02 3 0 009 4 0 01 increase in 124 8 g NaOH and 4 9 g H SO4 are present in one litre of the solution What is its pH 1 1 2 13 3 12 4 2 imes

197 In a process 500 calories of heat is given to a sys tem and at the same time 100 joules of work is done on the system The increase in the internal energy of the system is 1 40 calories 3 2193 joules 2 1993 joules 4 82 calories

strong acid of 4 4 0 e prepare as is in 1 L is in 2 L s in 3 L s in 4 L s in 5 L 4 7 129 Choose the wrong statement 1 For a neutral solution H OH K 2 For an acidic solution H K and OH K 3 For a basic solution H K and JOHN K 4 For a neutral solution at all temperatures H OH 10 7 M the following salts W W

X103 If the subsidiary quantum number of a subenergy level is 4 the maximum and minimum values of the spin multiplicities are b 10 1 a 9 1 c 10 2 d 4 4 104 Which two orbitals are located along the axis and not between the axis A

KN0179 79 A train is moving towards East with a speed 20 m s A person is running on the roof of the train with a speed 3 m s against the motion of train Velocity of the person as seen by an observer on ground will be 1 23 m s towards East 2 17 m s towards East 3 23 m s towards West 4 17 m s towards West tak 1 2 3 4 185 At with dra H 2

15 Kinetic and potential energy in eV of electron present in second Bohr s orbit of hydrogen atom are respectively Energy of first Bohr s orbit 13 6 eV NCERT Pg 46 1 13 6 27 2 3 3 4 6 8 2 1 51 3 02 0 4 3 02 1 51

67 A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T Neglecting all vibrational modes the total internal energy of the system is 1 4 RT 3 9 RT 2 15 RT 4 11 RT

Suppose the elements X and Y combine to form two compounds XY and X Y When 0 1 mole of XY weighs 10 g and 0 05 mole of X Y weighs 9 g the atomic weights of X and Y are 1 40 30 3 20 30 NEET Phase 2 2016 98 0 2 60 40 4 30 20

KNO 171 Six persons of same mass travel with same speed u along a regular hexagon of side d such that each one always faces the other After how what will they meet each other e CIP 3 2d ut ud 2d 3u 4 d 3u 2

A stone is thrown upwards and it rises to a height of 200 m The relative velocity of the stone with respect to the earth will be maximum at 1 Height of 100 m 2 Height of 150 m 3 Highest point 4 The ground 0178

95 man is walking on a road with a velocity of 3km h when suddenly it starts raining velocity of rain is 10km h in vertically downward direction relative velocity of the rain with respect to man is 1 13 km hr 2 7 km hr 3 109 km hr 4 13 km h 2020

decomposes on heating to give carbon dioxide and 8 0 g magnesium oxide What will be the percentage purity of magnesium carbonate in the sample Atomic weight of Mg 24 1 60 2 84 3 75 4 96 S

ALLEN 179 Absolute zero temperature is one at which 1 All liquids convert into solid 2 All gases convert to solid 3 All matter is in solid state

xture Take and that of ture is 4 24g 177 Relation between pressure P and energy density E of an ideal gas is 2E 1 P 3 P 3 3E 5 2 P 3E 2 4 P E

B energy on increas K2 57 In the reaction A the temperature 1 K increases but K decreases 2 K decreases but K increases 3 Both K and K in creases 2 4 Both K and K decreases

A mixture of 2 3 g formic acid and 4 5 g oxalic acid is treated with conc H SO The evolved gaseous mixture is passed through KOH pellets Weight in g of the remaining product at STP will be NEET 2018 1 1 4 3 4 4 2 3 0 4 2 8

12 10 g of MnO on reaction with HCl forms 2 24 L of Cl g at NTP the percentage impurity 450 g of MnO is Mn 55 0x5 MnO 4HCl MnCl Cl 2H O 1 87 2 25 3 33 3 4 13 XI 1 01 2

For an elementary reaction 2A B A2B if the volume of vessel is quickly reduced to half of it s original volume then rate or reaction will A Unchange B Increase four times C Increase eight times D Decrease eight times

170 Four persons P Q R and S of same mass travel with same speed u along a square of side d such that each one always faces the other After what time will they meet each other u e CIP 2d 3 SF u R d 2 30 4 d 3u a spee 5 m s The tim equal to 1 12 3 15 175 Two tra direction ession 20 m s T 1 2 s 3 2

159 If the r m s velocity of hydrogen becomes equal to 10 the escape velocity from the earth surface then the temperature of hydrogen gas would be 1 1060 K 2 5030 K 2 8270 K jon

3 33 The switch shown in the figure 3 306 is closed at t 0 The charge on the capacitor as a function of time is given as OY R R R higo posled A CV 1 e RC C CV 1 e 3 RC Figure 3 306 0 7 TV B 3CV 1 e RC D CV 1 e 3RC

6 Two cars are moving in the same direction with the same speed of 30 km h They are separated by 5 km What is the speed of a car moving in the opposite direction if it meets the two cars at an interval of 4 minute 1 45 km h 3 105 km h 2 60 km h 4 None MATCS03 EXERCISES

Liquid water is in equilibrium with ice in a closed container The vapour pressure at equilibrium can be decreased by 1 Increasing volume of vessel 2 Addition of water 3 Addition of ice 5 Addition of NaCl

3 In which molecule mass of both elements in the molecule are equal NCERT Pg 19 9 1 CO 3 NH3 2 SO 4 H O2 A hydrocarbon contains 80 carbon by mass The empirical formula of the

163 A bomber is flying horizontally with a constant speed of 150 m s at a height of 78 4 m The pilot has to drop a bomb at the enemy target At what horizontal distance from the target should he release the bomb 1 0 mi 3 600 m 2 300 m 4 1000 m KN0164 54 tra 18 as 1 3

18 The density of 1 M solution of compound A is 1 12 g mL 1 The molality of the solution is Molar mass of A 120 g mol NCERT Pg 23 1 0 55 m 2 0 75 m 3 1 m 1 12 m

KN0175 trains each 50m long are travelling in opposite directions with respective velocities 10 m s and 15 m s The time of crossing is 1 2 s 2 4 s 3 2 3 s 4 4 3s 175 Two 2020 2

KN0150 150 A force F 6t i 41 acts on a particle of mass 3 kg What will be velocity of the particle at t 3 second if at t 0 the particle was at rest 1 181 6j 2 181 12 3 121 6 4 none KN0151

KNO167 RELATIVE MOTION IN ONE DIMENSION 67 A train moves in north direction with a speed of 54 km h A monkey is running on the roof of the train against its motion with a velocity of 18 km h with respect to train The velocity of monkey as observed by a man standing on the ground is 1 5 m s due south 2 25 m s due south 4 10 m s due north KN0168 3 10 m s due south

3 3 202 21 4 3 KN0166 66 A boy wants to jump from building A to building B t of building A is 25 m and that of building B 5m Distance between buildings is 4m Assume that the boy jumps horizontally then calculate minimum velocity with which he has to jump to land safely on building B A 25 m A 4 m B 5 m

148 Pre Medical Physics 168 A lift is moving downwards with acceleration a A 172 man in the lift drops a ball within the lift The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively 1 g 9 3 g a g 2 g a g a 4 a g KN0169 169 A boat takes 2 hours to go 8 km and come back 173

Pre Medical Physics 147 64 A particle is projected horizontally with a speed of 20 3 m s from some height at t 0 At what time will its velocity make 60 angle with the initial velocity 1 1 sec 3 1 5 sec 20 m s 2 2 sec 4 2 5 sec

that he can successfully 1 3 1 2 4 0 make the jump 3 4 9 14 7 m s 62 From the top of a tower 19 6 m high a ball is thrown horizontally If the line joining the point of projection to the point where it hits the ground makes an angle of 45 with the horizontal then the initial velocity of the ball is 1 9 8 m s 3 sion 2 4 9 m s 4 2 8 m s KN0163

If water of crystallization is removed fr om all the hydrated salts as shown in t he figure will all get white colour in bec oming anhydrous like copper sulphate became white on losing water of crysta llization OR is it different colour in each salt if y es then tell in detail which colour each will give on losing water of crystallizati on

beying 164 According to Maxwell s law of distribution of lowing velocites of molecules the most probable velocity is 1 greater than the mean speed 2 equal to the mean speed 3 equal to the root mean square speed 4 less than the root mean square speed

KN0151 151 A number of bullets are fired in all possible directions with the same initial velocity u The maximum area 157 Wher of ground covered by bullets is veloci 1 3 5 2u 9 2g 2 3 4 1 gt 3

1 2 s 2 5 s 3 7 s 4 9 s KN0159 159 An aeroplane moving horizontally with a speed of 180 km h drops a food packet while flying at a height of 490 m The horizontal range of the packet is 1 180 m 2 980 m 3 500 m 4 670 m KN0160 ne 165

If the atomic mass unit u were defined to be 5 of the mass of an atom of C 12 what would be the atomic weight of nitrogen in amu or u in this state Atomic weight of N on conventional scale is 14 a 6 77 u c 14 u b 5 834 u d 23 u

61 A stuntman plans to run along a roof top and then horizontally off it to land on the roof of next building The roof of the next building is 4 9 metres below the first one and 6 2 metres away from it What should be his minimum roof top speed in m s so that he can successfully make the jump 1 3 1 2 4 0 3 4 9 Bic 4 6 2

In an experiment 50 mL of 0 1 M solution of a salt reacted with 25 mL of 0 1 M solution of sodium sulphite The half equation for the oxidation of sulphite ion is So aq H O SO2 aq 2H 2e If the oxidation number of metal in the salt was 3 what would be the new oxidation number of metal

Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a mathonde mathanda half life of 3 33 h at 25 C After 9 h the fraction of sucrose remaining is f The value of logio 7 2 is max 10 Rounded off to the nearest integer Assume In 10 2 303 In 2 0 693

Balance the chemical equation and then answer the following question ased on the balanced equation If there are 500 mL of 6 00 M HCl how many moles of HCl is that equal to 2 How many moles of NaOH will react with 3 moles of HCI

The eauivalent conductance of a solution containing 3 2h of CuSO4 M wt 160 per L is 91 0 ohm 1 cm eq Its conductivity would be 2 73x10 3 ohm 1 cm 1 3 64x10 3 ohm 1 cm cm 1 1 82 10 3 ohm 1cm 1 0 91 10 3 ohm cm 1 1