Physics Questions

The energy required to charge a parallel plate condenser of plate separation d and plate area of cross section A su that the uniform electric field between the plates is E is JAIPMT 200 1 E E Ad 2 E Ad 3 EAd E Ad

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44 Velocity time graph is given for a object moving along a straight line then distance covered by the particle in to sec will be slope of graph is a v Ao 1 fore 2 v to at 4625 V V 60 2 CET B V Both are correct 4 None vito T V V to 2 mis a tyto 2 at Spul 2 S 14 5 4

H 4 P is best Q worst Two thermometers are used to record the temperature of a room If the bulb of one is wrapped in wet hanky 1 The temperature recorded by both will be same 2 The temperature recorded by wet bulb thermometer will be greater than that recorded by the other The temperature recorded by dry bulb thermometer will be greater than that recorded by the other 4 None of the above

One quality of a thermometer is that its heat capacity should be small If P is mercury thermometer Qis resistance thermomerter and R thermocouple type then 1 P is best R worst 2 R is best P worst 3 R is best Q worst 4 P is best Q worst is wrapped in wet hanky

In a photodiode the reverse current increases when exposed to light of wavelength of 750 nm or less The band gap of semiconductor used is O 1 2 eV O 1 65 eV O 0 9 eV O 1 50 eV

A particle moves along X axis Its equation of motion is x 2t t 2 where t is in second Then mark the correct statement s the particle moves away from origin for t 2s the particle momentarily comes to rest at t 1s the particle moves in S H M the given equation represents uniformly accelerated motion

0 12 N 2 0 21 N Length of a string tied to two rigid supports is 40 cm Maximum length wavelength in cm of a stationary wave produced on it is 1 20 2 80 3 40 4 120 linear mass density of 9 8 g m is stretched with a tension of 10 kg wt between two rigid supports 1

Two capacitors C and C are charged to same potential V but with opposite polarity as shown in the figure The switch S and S are then closed HF C C 0 p d across two capacitors are same and is given by p d across two capacitors are same and is given by C C V C C C V C C 0 ratio of final energy to initial energy of the system is given by C C C C C C C ratio of final energy to initial energy of the system is given by S S

If I is the moment of inertia of a solid body having a coefficient of linear expansion then the change in I correspondin to a small change in temperature AT is 1 qI AT 3 2 a IAT 2 a1 AT 4 3 a IAT

Light with intensity 18 W cm falls on non reflecting surface at normal incidence If surface has an area of 20 cm2 find the average power exertec surface during time span of one minute 0 1 2 x 10 6 N 2 4 x 10 6 N 3 2 x 10 6 N 1 9 10 5 N

A travelling wave represented by y A sin ot kx is superimposed on another wave represented by y A sin cot kx The resultant is TAIEEE 2011 1 A wave travelling along x direction 2 A wave travelling along x direction n 3 A standing wave having nodes at x 2 4 A standing wave having nodes at x n 0 1 2 1 5 n 0 1 2

A letter A consists of a uniform wire of resistance 0 2 oh m per cm The sides of the letter are each 20 cm long and the cross piece in the middle is 10 cm long while the apex angle is 60 degree Find the resistance of the letter betwe en the two ends of the legs

Q In a dispersive medium the phase velocity u is a u is a function of b u is a not a function of c u is a function of d None of the above

Zero Marks Negative Marks 1 If none of the options is chosen i e the question is unanswered In all other cases The capacitor in the figure has C 10 F and distance between the plates d 1mm when the switch was open Now with the switch closed the distance is reduced to 0 8d with the attached plate at equilibrium Assume left plate is fixed and the spring was initially in relaxed state If E 4volts then the spring constant K is equal to C 10uF K m

The figure shows two identical metallic plates kept parallel to each other and charged as shown Calculate the surface charge density in C cm2 that will appear on the side of plate I which is facing plate II Given Q 200 0 C and plate surface area 100cm 3Q Q

Neganve Marks The figure shows two identical metallic plates kept parallel to each other and charged as shown Calculate the surface charge density in C cm that will appear on the side of plate I which is facing plate II Given Q 200 0 C and plate surface area 100cm Q 8 in other cases 4 5 3Q Plate I Plate II

A ray of light passes through an equilateral prism in such a manner that angle o incidence is equal to angle of emergence and each of those angles is equal to of angle of prism The angle of deviation is O 30 O 37 42 45

are A wave pulse is generated in a string that lies along x axis At the points A and B as shown in figure if R and R ratio of wave speed to the particle speed respectively then 1 R Rg 3 R R A B Vp slope Uwave 1 slepe V way Up SAZSB sloped A 2 R RA 4 Information is not sufficient to decide to the right without changing shape Consider two particles at

20 The following figure depicts a wave travelling in a medium Which pair of particles are in phase 1 A and D 2 B and F B wave depends E 3 C and E G 4 B and G

A uniform spherical ball of radius r and mass m is dropped into a lake having liquid of density one third of density of ball and viscosity n Choose INCORRECT statement for steady state having terminal speed UT O Drag force at steady state is mg O Gravitational potential energy is getting lost at rate mgur at steady state Heat produced at rate mgur at steady state O Ball gains approximately 63vT 100 speed after time t 6 m

We know moving charges are what produces an electrom agnetic field But we know the particles of light are photon s and that photons have no charge Then how can light pro duce an electric and magnetic field and hence how can it be considered as an electromagnetic wave

he dispersive power of material of a lens is 0 04 and mean focal length of lens s 15 cm The difference in focal lengths of lens for violet and red colour is 03 mm 04 mm O 5 mm 6 mm

Zero Marks 0 In all other cases sphere of radius R carries charge such that its volume charge density is proportional to the square of the distance from the centre What is the ratio of the magnitude of the electric field at a distance 2R from the magnitude of the electric field at a distance of R 2 from the centre ie Er 2R Er R 2

Two coherent sources are separated by a distance d 2A are placed at the centre of a large circular screen arranged symmetrically as shown R is radius circular screen R d Light of wavelength A is used in the experiment How many bright fringes will be observed on screen from A to B first quadrant Y axis S B 02 03 S A Circular screen d 2 X axis

A travelling wave on a string is given by y Asin ax t The displacement and velocity of oscillation of a point a 0 56 cm 12 sec A 7 5 cm x 1 cm and t Is is 1 4 6 cm 46 5 cm s 1 3 1 76 cm 7 5 cm s 2 3 75 cm 77 94 cm st 4 7 5 cm 75 cm s mond frequency Hz is propagating in a string in the negative x

4 Maximum displace There are some points in a stationary waves which 1 Are never at rest 2 Are always in motion 4 Are at rest once in each cycle 3 Are at rest twice in each cycle Actretched string of length L fixed at both ends can sustain stationary waves of wavelength give

In a lake a fish is rising vertically to surface of water uniformly at a rate of 3 m s observes a bird diving vertically towards water at a rate of 9 m s The actual velocity of the dive of the bird p 4 3 06ms 1 O 3 6 ms 1 4 5 ms 1 10 ms 1

Negative Marks 1 In all other cases If the escape velocity for an object placed at the surface of the earth is ve then the escape velocity for the same object when projected from the point of a tunnel made along diameter of the earth from a depth of d 0 05R where R is the radius of the earth is Less than v by a factor of more than 5 Greater than v by a factor of more than 5 Less than ve by a factor of less than 5 Greater than v by a factor of less than 5

There are n infinite metal plates arranged parallel to each other as shown Q Q Q3 charges on these plates Charge Q on the left surface of leftmost plate in the arrangement is I 1 0 To O O Q Q Q3 n Q Q Q3 Qn 2 Zero Indeterminate as distances between different plates are not given Qn are respective

A stationary man observes that the rain strikes him at an angle 60 to the horizontal When he begins to move with a velocity of 25 m s then the drops appear to strike him at an angle of 30 from horizontal The velocity of the rain drops in m s is

Two equal masses are situated at a separation ro One of them is imparted a velocity vo ind the ratio of maximum and minimum separation between them Gm To perpendicular to the line joining them both are free to move Treating motion only under mutual gravitational forces

A circular hole of radius R 2 is cut from a circular disc of radius R The disc lies in the xy plane and its centre coincides with the origin If the remaining mass of the disc is M then a determine the initial mass of the disc and b determine its moment of inertia about the z axis R y

Consider the following statements 1 XeO3 is a colourless explosive solid 11 XeOF4 is a colourless volatile solid III lonization enthalpy of molecular oxygen is identical with xeno Choose the correct statements O I II and III OII and III only OI and III only OI and II only

A bulb is placed at depth of 2 7 m in water and a floating opaque disc is placed over the bulb so that bulb does not appear visible from the surface The minimum radius of the disc is w 4 3 06m O 2 7m O 4 9 m 12 m

The wire of a sonometer has a length of 1 m and mass 5 x 10 4 kg It has a tension of 20N IF the wire is pulled at a point 25 cm away from one end and released the frequency of its vibrations will be 6 1 2X1 2 150 Hz 3 250 Hz 4 100 Hz 201 6x10 40 27 h 1 200 Hz wova having 3 podes and antipodes is formed between two atoms having a distance of 1 21 between

How many number of maximas are formed on a finite screen in Young s double slit experiment given slit screen separation as 1 meter separation between slits 3 mm and wavelength used is 0 5 mm 05 06 O 11

Ques 2 A particle of unit mass is projected vertically upward with a velocity u Assuming that the ir resistance is k times the instantaneous velocity of the particle show that the particle will return o point of projection with velocity V given by g kuj kV V u log k 9

A radioactive isotope A with a half life of 1 25 x 1010 year decays into B wh stable A sample of rock from a planet is found to contain both A and B pre in the ratio 1 15 The age of the rock is 0 4x107 year O 5 x 10 year O 5 10 0 year O 4 x 10 1 year

A charged particle q is placed inside a grounded metallic shell of inner and outer radii a and h respectively as shown in the figure The particle is at a distance of magnitude of potential at the center of the sphere is equal to I 1 4m o Lb 1 191 4mo la 1 47 o a CE L 9

A monoatomic gas undergoes a polytropic process which is defined by expression PV3 constant The molar specific heat capacity of the gas will be R is universal gas constant OR O2R O 3R

Section A Q 1 When white light enters a prism it gets split into its constituent colors This is due to a Different refractive index for different wavelength of each color b Each color has same velocity in the prism c Prism material have high density d Scattering of light

The resistnace of a wire of length 2m and area of cross section 0 5 mm is 2 20 The specific resistance of the material of wire will be Question Type Single Correct Type 1 5 5 x 10 70 m 2 Zero 3 5 5 107 Q m

An electron is moving with velocity v around a nucleus in eliptically orbit then moment of inertia of electron v respect to nucleus is 1 always zero 2 always constant 3 changes with time 4 can t fond Relation between wavelength of photon and electron of same energy is

Zero Marks 0 In all other cases At t 0 a particle leaves the origin with a velocity of 6 m s in the positive y direction Its acceleration is given by a 21 3m s If the x and y coordinates of the particle at the instant the partic maximum y coordinate are x y then find x y in meters

An electric bulb rated 100 W 100 V has to operated across 141 4 V 50 Hz A C supply Th capacitance of the capacitor which has to b connected in series with bulb so that bulb will glo with full intensity is NCERT Pg 25 10 3 1 F 2 4 10 2 1 F F

Sound waves from a tuning fork F reach a point P by two separate routes FAP and FBP when FBP is greater th FAP by 12 cm there is silence at P If the difference is 24 cm the sound becomes maximum at P but at 36 cm there is silence again and so on If velocity of sound in air is 330 ms the least frequency of tuning fork is 1 1537 Hz 2 1735 Hz 3 1400 Hz 4 1375 Hz closed pine R have the same frequencies at a given temperature

In a stationary wave all particles are 1 At rest at the same time twice in every period of oscillation 2 At rest at the same time only once in a every period of oscillation 3 Never at rest at the same time 4 Never at rest at all Jocity of

During a 3 minus decay O An atomic electron is ejected O A neutron in the nucleus decays emitting an electron O A part of binding energy is converted into electron O An electron which is already present in nucleus is ejected

Two particles A and B of de Broglie wavelength AA and Ag are in motion in one dimension They combine to form a particle C This process conserves momentum The incorrect relation of de Broglie wavelength of C in relation to that of A and B is 0 010 0 AAXAS AA AB XA XAB 8 1 A AXAB AXAR