Experiments Questions and Answers

The value of can be B me obtained by using a specially designed vacuum tube The figure contains a heated filament F and an anode A which is maintained at a positive potential relative to the filament by a battery of known voltage v Electrons get emitted from the heated filament and are accelerated towards the anode which has a small hole in the centre for the electrons to pass through into a region of constant magnetic field B which points into the plain of the paper The electrons then move in a semicircle of diameter d hitting the detector cathode as A F

3 0 50 mm A student measures the time period of 100 oscillations of a simple pendulum four times The data set is 90s 91s 95s and 92s If the minimum division in the measuring clock is 1s then the reported mean time should be 2016 1 92 5 0s 4 0 75 mm 101 9 A scr Main Circu Giver The c 1 C

5 In the circuit shown in figure find the amount of heat generated when switch s is closed SV SON

The measure of mass and volume of a body are 2 00 g and 5 0 cm respectively with possibl errors of 0 01 g and 0 1 cm What would be the maximum permissible error in its density Hint Ad Am AV Ad dx m V Am AV m V where d m V 1

During measurement of kinetic energy T the percentage error in measurement of mass of particle and momentum of particle are 2 and 3 respectively The percentage error in measurement of kinetic energy is a 2 b 5 c 3 d 7

13 A triple slit experiment is performed as shown in the figure with monochromatic light of amplitude au SMS N 8 The graph between resultant amplitude A versus 8 is plotted Choose the correct option s A B C D 42 3 A A20 Sol A C A10 A 20 A 0 2 2n S 2 d 21 3 S S S N 2 2 3 52 42 22 3 3 3 3 M 0 N A A 3 AN RIN N 3 2 D d 27 3 22 2 42 3 3 1 A20 42 3 A10 52 3 A10 A20 8 screen 8 2 where A1o and A20 are the values shown in option A A 0 5 where A10 and A20 are the values shown in option A A10 A20

A student measures the time period of 100 oscillations of a simple pendulum four times The data set is 90 s 91s 92 s and 95 s If the minimum division in the measuring clock is 1s then the reported mean time should be Choose only 1 answer A 92 2 s B 92 5 s C 92 1 8 s

During Searle s experiment zero of the Vernier scale lies between 3 20 x 102 m and 3 25 x 102 m of the main scale The 20th division of the Vernier scale exactly coincides with one of the main scale divisions When an additional load of 2 kg is applied to the wire the zero of the Vernie scale still lies between 3 20 x 102 m and 3 25 x 10 2 m of the main scale but now the 45th divisio of Vernier scale coincides with one of the main scale divisions The length of the thin metallic wir is 2 m and its cross sectional area is 8 x 10 7 m The least count of the Vernier scale is 1 0 105 m The maximum percentage error in the Young s modulus of the wire is 2014

C L V D 6 Which statement is not true in case of relative motion A Relative displacement is independent to the frame of references B Relative separation is independent to the frame of references C Relative velocity is independent to the frame of references D Time is independent to the frame of references

n a meter bridge a standard resistor R ohm is connected in left gap and two dentical wires A and B are connected one after the other in right gap The balancing length measured from left gap is 50 cm If two wires are connected in parallel and put in right gap the balancing length measured from left gap would De in cm 25 Read More 60

The displacement of a particle along the x axis is given by x asin cot The motion of the particle corresponds t 2 simple harmonic motion of frequency 30 2r AIPMT 2 1 simple harmonic motion of frequency art 3 non simple harmonic motion 4 simple harmonic motion of frequency w 2m

1 Increases by 1 2 Increases by 0 5 3 Decreases by 0 5 In a simple pendulum the period of oscillation T is related to length of the pendulum as 1 constant 2 1 T constant 7 3 1 T constant 122 T constant

A Galileo telescope has an objective of focal length 100 cm magnifying power 50 The distance between the t lenses in normal adjustment will be 2 100 cm 3 98 cm 4 200 cm 1 150 cm The convex lens is used in

When two bodies collide elastically the force of interaction between them is conservative 2 non conservative 3 either conservative or non conservative 4 zero

In the Davisson and Germer experiment the velocity of electrons emitted from the electron gun can be by AIPMT 2011 increasing the potential difference between the anode and filament 2 increasing the filament current 3 decreasing the filament current 1 decreasing the potential difference between the anode and filament JAIPMT 2011

180 Proton Which of the following is not deflected by electric field Electron Mark for Review a particle Neutron hr

and area of shown in the circuit given below Given that resistivities of the wires PA PB Pc and Po are 22 m 62 m 12 2 m and 2 2 m respectively S 12 V H A 4V 122 H M ww 492 B 152 S Then the position of null point is 1 Mid point of wire B when both switches are open 2 Mid point of wire C when both switches are open 3 Right end of wire A when switch S is closed and S remains open

Average speed of a bus measured by six different students is given as follows Student number Speed m s 1st 12 5 m s Column l Mean absolute error A B Mean value C D Percentage error Relative error Which option is correct 2nd 12 3 m s P Q R S 3rd 11 8 m s 0 2 12 3 m s 0 0163 1 63 4th 12 4 m s 5th 12 2 m s Column II 6th 12 6 m s

a A steady current flows in a metallic conductor of non uniform cross section Which of these quantities is constant along the conductor current current density electric field drift speed

9 A mosquito net over a 7 ft x 4 ft bed is 3 ft high The net has a hole at one corner of the bed through which a mosquito enters the net It flies and sits at the diagonally opposite upper corner of the net a Find the magnitude of the displacement of the mosquito b Taking the hole as the origin the length of the bed as the X axis its width as the Y axis and vertically up as the Z axis write the components of the displacement vector

of the above Which of the following is the most precis instrument for measuring length 1 Metre rod of least count 0 1 cm 2 Vernier callipers of least count 0 01 cm 3 Screw gauge of least count 0 001 cm 4 Data is not sufficient to decide

30 In a potentiometer of 10 wires the balance point for measuring the emf of a cell is obtained on 6th wire To shift the balance point on 8th wire we should 1 Decrease resistance in series with the cell whose emf is to be measured 2 Increase resistance in series with the cell whose emf is to be measured 3 Decrease resistance in main circuit in series with potentiometer battery 4 Increase resistance in main circuit in series with battery

42 teur 1 r 1 Fort 201 Loter K 2 3 A uniform magnetic field of indu confined to a cyclindrical region of radius R The magnetic field is increasing at a constant dB dt rate of tesla second An electron e m placed at the point P on the periphery of the field experiences an acceleration 4 0 CIER leR dB 2m dt leR dB 2m dt eR dB m dt X X X X X X x R X xx x X X X X P X towards left towards left X towards right X X X xx X E R I

Q No 13 While measuring the surface tension of a liquid by a capillary of non uniform bore its radius should be measured 1 at the lower end dipped in liquid at the upper end open in air 3 by taking mean of the radii at the two ends by cutting the capillary at the point up to which the liquid rises in the capillary Correct Answer 4 Status unattempted

Which of the following measurement is more accurate 1 40 m 3 400 x 10 m 2 0 04 m 4 4 x 10 m If the random error in the arithmetic mean of 50 observations is a then the random error in the mean of 150 observations would be 1 s 2 3

3 In the potentiometer circuit shown in figure the internal resistance of the 12 V battery is 1 2 and length of the wire AB is 100 cm When CB is 60 cm the galvanometer show no deflection The emf of cell E is the resistance of wire AB is 3 2 A 1 3 6 V 3 3 V E 12 V 20 2 2 4 V 4 4 5 V B

d the voltage e voltmeter ng V A micrometer has a resistance of 10002 and full scale deflection current of 50 A How can it be made to work as an ammeter of range 5mA By connecting 102 resistance in parallel with it

The VC shown in the diagram has zero error in it as you can see It is given that 9 msd 10 vsd The observed reading of the length of a rod measured by this VC comes out to be 5 4 mm If the vernier had been error free then reading of main scale would be and the coinciding division of vernier scale would be zero of vernier scale a 6 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 b 6 3 c 6 4 d 7 3

The diagram shows a boiling tube filled with water There is an ice cube wrapped with wire gauze at the bottom of the tube and the water at the top of the tube is heated as shown When water at the top of the tube is boiling the ice cube remains frozen What can you infer from this experiment A Heat gain causes matter to expand C Ice cubes melt at 0 C Ice cube with wire gauze Water Boiling po Bunsen burner B Heat loss causes matter to contract D Water is a poor conductor of heat

4 Coulomb s Law can be expressed as F A r Use the fitting curve of the data to estimate the value of A Express your estimate with the correct units Hint Do not confuse A with the proportionality constant k of Coulomb s Law BIU Force N 0 006 0 005 0 004 0 003 0 002 0 001 10 15 Force vs Distance 20 25 Distance cm 30 35 40

Examine the table Items A B C D E TI F Colour in acid No colour Light pink Black Yellow Red White Colour in alkali Pink Light yellow Black Red Blue White 1 Which of the above items can be used as indicators 2 Name the items A and E 3 Name two natural things which can be used as indicators

particle moving along x axis has acceleration f at time t given by f fo 1 where fo and T are constants The particle at t 0 has zero velocity In the time interval between t 0 and the instant when f 0 the particle s velocity v is b for d f T a c 1 for IN in for 2007

Two cylindrical tanks contain two different liquids with density in the ratio 2 1 Holes of cross section with ratio 2 1 are made at heights h and h below the liquid from bottom of the tanks Find the ratio when mass flux through holes is same h 16 1 8 1

rv A particle is projected at an angle 60 with horizontal with speed 10 m s The time after which the s 1 of the particle remains times of its initial speed is 3 1 5 3 s 2 S 1 3 s 4 10 3s above

From the given position as shown in the figure the plank starts moving towards left with initial velocity and acceleration zero 8 m s The rod flies in the air and falls back on the plank With all surfaces smooth what should be the least possible length so that the rod doesn t fall off the plank A 4 84 m B 3 84 m C 5 62 m D 4 62 m 37

STATEMENT 1 A body is lying at rest on a rough horizontal surface A person accelerating with acceleration al where a is positive constant and i is a unit vector in horizontal direction observes the body With respect to him the block experiences a kinetic friction STATEMENT 2 Whenever there is relative motion between two rough contact surfaces then kinetic friction acts A Statement 1 is True Statement 2 is True Statement 2 is a correct explanation for Statement 1 B Statement 1 is True Statement 2 is True Statement 2 is NOT a correct explanation for Statement 1 C Statement 1 is True Statement 2 is False D Statement 1 is False Statement 2 is True

27 View In English A 2 volt battery a 150 resistor and potentiometer of 100 cm length all are connected in series If the resistance of potentiometer wire is 50 then the potential gradient of the potentiometer wire is 1 2 3 4 rect Answer 1 ar Answer 3 tus incorrect 0 005 V cm 0 05 V cm 0 02 V cm 0 2 V cm Add to Bookmark List Dimicuity Lover Ow Topic prysics Falternating current oor

1 20 A car C travelling at a uniform speed of 75 kph passed another car C at rest beside the track Two minutes later C starts and accelerates uniformly until its speed increases to 100 kph then it maintains the speed After 12 minutes from the instant C passes C C is 800 m ahead of C Find when and where C overtakes C and the acceleration of C Ans 10 1 min 12 6 km 0 443 m s

The terminal potential difference of a galvanometer is 1 V for its full scale deflection A resistance of 950 con nected in series with it converts it to a voltmeter that can read a maximum of 20 V What is the resistance of the gal 502 vanometer

In the figure ab and cd are two long conducting wires kept parallel to each other at a separation I in a uniform time varying magnetic field The ends a and c are connected together by a resistor of resistance R The magnetic induction B perpendicular to the plane of the wires varies with time according to the relation B Bot where B is a positive constant with proper unit and t is the time in second A conducting wire PQ placed on the wires ab and cd and dragged on the wire with constant speed v along the length of the wires by applying a constant force F At t 0 PQ is very close to ac Ignore any resistance electrical as well as mechanical other than R Find the value of FR 250 R 1 y X X RX X X a www X X X X X X X X O X X X X F X X

The velocity of a rocket in meters per second t second after it was launched is modeled by v t 2 t Then the total distance traveled by the rocket during the first four seconds of its launch is 16 1 3 m 2 32 m 32 m 3 4 16 m 3

5 Using screw gauge of pitch 0 1 cm and 50 divisions on its circular scale the thickness of an object is measured It should correctly be recorded as 1 2 121 cm 3 2 125 cm 2 2 124 cm 4 2 123 cm

The density p of a piece of metal of mass m and volume Vis given by the relation p m V If m 275 32 0 01 g and V 36 41 0 01 cm then the percentage error in p will be a 0 01 c 1 b 0 02 d 0 03

A uniform magnetic field of induction B is confined to a cyclindrical region of radius R The magnetic field is increasing at a constant rate of dB tesla second An dt electron e m placed at the point P on the periphery of the field experiences an acceleration X 1 X X X X X X X X x x R X X X P X X x x X X 1eR dB 2m dt towards left X Question Type Single Correct Type X X X

216 To compare the emfs of two primary cells and e in the given circuit of potentiometer first balance point is obtained for E cell in the circuit only for length 1 x 1 1 Now balance point obtained again for the cell of emf only for length 12 B x 1 From Eqs i and ii 12 1 In the figure a long uniform potentiometer wire AB is having a constant potential gradient along its length The null points of the two primary cells of emfs and E connected in the manner shown are obtained at a distance of 120 cm and 300 cm from the end A E The value of will be 62

A and A and B are measured with error A B AA and AB respectively then relative error in Z 1 If Z AZ that is is equal to Z AA 1 A AA AB A B LAR 2 AA AA AB A A B A AA AB

Which of the following instruments has minimum least count a A vernier callipers with 20 divisions on the vernier scale coinciding with 19 main scale divisions b A screw gauge of pitch 1 mm and 100 divisions on the circular scale c A spherometer of pitch 0 1 mm and 100 divisions on the circular scale d An optical instrument that can measure length to within a wavelength CHOL

4 2 3 1 Br Chemistry 2 Correct reactivity order for S 1 reactions is Br Br Y Br Y Br Br Y Br CH Br A Br Br Br CH Br CH Br CH Br Br t Br

The displacement x time t graph o f a particle moving along a straight line is shown in graph The ratio of magnitu de of velocities of particle for two regio ns OA and AC is X 60 A VOA VAC 30 t

A body of mass m was slowly hauled up the hill as shown in fig by a force F which at each point was directed along a tangent to the trajectory Find the work performed by this force if the height of the hill i h the length of its base 1 and the coefficient of friction k M I