Physics Questions

2 A circular loop of radil magnetic field pointing perpendicular to plane of figure when the current I flows in loop the tension produced in the loop is 1 BIR X X X X X XA X X X X xxx Rx x X X X X X X X 2 BIR 2

A spring block system undergoes vertical oscillation above a large horizontal non conducting sheet with uniform positive charge The time period of the oscillation T If the block is given a charge Q its time period of oscillation will be A T C T B T D T if Q is positive and T if Q is negative

If the electric flux through a spherical surface containing some point charges is zero then A the electric field is zero everywhere inside the surface B the electric field is zero everywhere at the surface C the electrostatic potential energy of the system inside the surface is zero D None of these

The figure shows the displacement time graph of a particle executing S H M If the time period of oscillation is 2s the equation of motion of its SHM is farger vert af SHMERY in m 10 A 5 for de 2 1 s A x 10sin nt n 3 B x 10sin t C x 10sin nt 6 D x 10sin 2nt n 6 Your Answer C

In the following circuit the output Y for all possible inputs A and B is expressed by the truth table Ao AD Bo A ABY 000 1 0 1 10 1 1 1 1 C AB 00 0 1 1 BY 1 1 1 0 1 1 0 A B ABY 000 B A 0 1 1 D A ABY 010 1 10 0 0 1 0 10 00 1 1 0 1 1 90

A uniform electric and magnetic fields are produced pointing in the same direction If an electron is projected with some velocity pointing in the same direction The electron s velocity will decrease in magnitude The electron s velocity will increase in magnitude Velocity remains constant Velocity first increase then suddenly become zero

Integrated chip IC is an electronic device that contains fa IC A transistors aifGree B resistors afari C transistors and resistors Efter en fari D transistors resistors and capacitors forex gfrieden

The electric field E A y j exists in a region where a cylinder of radius r and length L is placed with its curv surfaces parallel to y axis The charge inside the volume of the cylinder is TL A Ao o B A r L C r D 2A r L Je

Practice problems Electrostatics I Electric field potential Gauss s law Q 1 16 4 1 35 minut A half ring of radius R carries a charge per unit length The potential at the center of the half ring is A 27 THE O B 2 TE 0 C 280 D 2 480

accelerated through the same potential difference enter in uniform transverse magnetic field and describe circular paths of radii R and R respectively Then the ratio of their masses m m is 30 30 R R R EE 2 2 R R

View in English A proton of mass 1 67 x 10 27 kg and charge 10 x 10 19 C is projected with a speed of 2 x 106 m s at an angle of 60 to the x axis If a uniform magnetic field of 0 104 T is applied along y axis the path of proton s helix with circular O radius 0 2m O radius 01m O radius 0 5m radius 0 7m

A proton a deuteron and an a particle enter a magnetic field perpendicular to the field with same velocity What is the ratio of radii of circular paths 1 2 2 2 1 1 1 1 2

Orbital velocity of a given artificial satellite moving in a circular orbit just above the earth s surface is Vo The value of orbital velocity for another satellite orbiting at height half of earth s radius will be given by 3 A Vo B C 3 VO Correct Answer 2 3 Vo

A hollow metallic isolated sphere of inner radius R and outer radius 2R is carrying a net charge q Then the charges at the inner and the outer surface of the sphere are respectively A 0 q B q 2 q 2 C q 3 2q 3 D q 5 4q 5

A proton of mass 1 67 x 10 27 kg and charge 1 0 x 10 19 C is projected with a speed of 2 x 106 m s 1 at an angle of 60 to the x axis If a uniform magnetic field of 0 104 T is applied along y axis the path of proton is helix with circular radius 0 2 m radius 0 1 m radius 0 5 m radius 0 7 m

Two particles Y and Z emitted by a radioactive source at P made tracks in a cold chamber as illustrated in the figure A magnetic field acted downward into the paper Carful measurements showed that both tracks were circular the radius of Y track being half that of the Z track Which one of the following statements is certainlty true fi za f fuff P af fagur tefter for any f A Both Y and Z particles carried a positive charge ciaria B The mass of Z particle was one half that of the Y particle C The mass of the Z particle was twice that of the Y particle I D The charge of the Z particle was twice that of the Y particle Your Answer

View in Englis A uniform magnetic field B exists in space A particle of mass m and charge ais projected towards x axis with speed from a point 3 0 0 The maximum value of for which the particle does not h plane is O O O Boga m Boga 2m Bog am Bog

A particle is projected from the gound with an initial speed of v at an agnle 0 with the horizontal The average velocity of the particle between its point of projection and highest point of trajectory is fat a A B C 2 a for a fu 2 1 cos 0 V f 1 2 cos 1 3 cos 0 2 D vcose

View in English When the switch is open in lowermost loop secondary circuit of a potentiometer the balance point length is 60 cm When the switch is closed with a known resistance of R 4 ohm the balance point length decreases to 40 cm Find the internal resistance of the unknown battery 40 O20 O30

A spherical conducting shell of radius R is placed with its center at the origin Two charges Q and Q are placed at a a and a a respectively where a R The field at the center due to induced charges on the conductor will be A C 4 Q 2 towards ai aj towards ai aj B zero D 2 towards ai aj

A proton moving with velocity v is acted upon by electric field E and magnetic field B The proton will move undeflected with constant speed if 1 E is perpendicular to B 2 E is parallel to v and perpendicular to B 3 E B and v are mutually perpendicular and E y lm w B 4 E and B both parallel to v

A coil of inductive reactance 3192 has a resistance of 8 2 It is placed in series with a condenser of capacity reactance 252 The combination is connected to an a c source of 110 volt The power factor of the circuit is A 0 56 C 0 80 B 0 64 D 0 33

The orbital velocity of electron in the ground state is v If the electron is excited to energy state 0 54eV its orbital velocity will be 3 3 Saf sa 0 54eV A V B v 3 C v 5 D v 7 Coe

Choose only incorrect statement from the following A ful A The position of the centre of mass of a system of particles at any moment does not depend upon the internal forces between the particles effe fext B The centre of mass of a solid is never lies outside the body of the solid C A body tied to a string is whirled in a circle with a uniform speed If the string is suddenly cut the angular momentum of the body will not change from its intial value can go for for A Ruffa D The angular momentum of a comet revolving around a massive star remains constant over the entire orbit rg H n Enfera com

Five equal resistances each of connected as shown in the Figure A battery of V volts is connected between A and B The current flowing in AFCEB will be A VR 2 V D R R C R F www A www R B B B E D V 2 R 3 V

A proton a deuteron and an a particle with the same kinetic energy enter a region of uniform magnetic field moving at right angle to field What is the ratio of the radius of their circular paths 1 2 1 1 2 2 2 1 1

The V I graph for a conductor at temperature T and T is shown in the figure T T is proportional to V fag T T 1 T T K A cos20 B sin20 C cot20 D tan20 Your Answer

The moment of inertia of thin square plate ABCD of uniform thickness about an axis passing through the centre O and perpendicular to the plane of the plate is not equal to Given I I I3 and I respectively are the moments of inertia about axes 1 2 3 and 4 which are in the plane of the plate ABCD 1 1 1 2 3 D A 1 1 B 1 1 13 14 Iz C 1 13 D 1 1 1 14 Your Answer

A plano convex lens of refractive index 1 5 and radius of curvature 30 cm is silvered at the curved surface Now this lens had been used to form the image of an object At what distance from this lens an object should be placed in order to have a real image of the size of the object i 30 cm arafa for at O A 20cm B 30cm fafar and for fi fosen fafara C 60cm di 1 5 D 80cm tifo f

If two conducting slabs of thickness d and d and thermal conductivity K and K are placed together face to face a shown in figure In the steady state temperatures of outer surfaces are 0 and 0 The temperature of common surfac 1 is 1 3 K 0 d K 0 d K d K d K 0 K 0 0 0 2 4 K 0 K 0 K K K 0 d K 0 d K d K d K K

An electron beam accelerated from rest through a potential difference of 5000 V in vacuum is allowed to impinge on a surface normally The incident current is 50x103 mA and if the electrons come to rest on striking the surface the force on it is scacia a far fa A ford fa fa fazl dial BI 34TFTH STI 50 103 mA 727 32 24 i FORTHG A 5000 1 1924 10 N B 2 1 10 N C 1 6 10 N D 1 6 10 N Your Answer

A convave mirror of focal length 200cm is used to obtain the image of the sun which subtends an angle of 30 Then the diameter of the image of the solar disc is 200cm and add at at fafara sick an for A 13 48cm B 1 75cm C 9 87cm D 20 0cm Your Answer 30

Two satellites S and S revolve round a planet in coplanar circular orbits in the same sense Their periods of revolution are 1 hour and 8 hour respectively The radius of the orbit of S is 10 km When S is closest to S Find the angular speed of S as actually observed by an astronaut S S fem 13 1 f 10 km for starter A 3 10 rad sec B 4x10rad sec C 5 104 rad sec D 6 104 rad sec Your Answer

The mass of radium mass number 226 half life 1600 years with an activity of one curie is almost 544 2261600 A B OU O 1 gram 1 8 gram C 2 gram D 3 2 gram Your Answer

A uniform magnetic field B Boj exists in space A particle of mass m and charge q is projected towards x axis with speed v from a point a 0 0 The maximum value of v for which the particle does not hit the yz plane is Boga m Boga 2m Bog am Bea

Maxwell s modified form of Ampere s Circuital Law is weiter au feu a uda 74 642 A B B dA 0 B dA C fEdi dt dos D dog B d f c H Eo dt Your Answer D

A suitcase is gently dropped on a conveyor belt moving at 3 m s If the coefficient of friction between the belt and the suitcase is 0 5 find the displacement of the suitcase relative to conveyor belt before the slipping between the two is stopped g 10 m s 3 m s g 10 m s af de A 2 7m B 1 8m C 0 9m D 1 2m fr faze

A cup of tea cools from 80 C to 60 C in one minute The ambient temperature is 30 C In cooling from 60 C to 50 C it will take 1 30 seconds 2 60 seconds 3 96 seconds 4 48 seconds 70 C to 60 C in 5 minutes The time needed by same liquid to cool from 60 C to 50 C will be

If we shift a body in equilibrium from A to C in a gravitational field via path AC or ABC by force F Then af 2 at C and B A The work done by the force for both paths will be same a fan and jai qui q B W W AC C W W AC D None of these Your Answer A ABC ABC

In a two dimensional motion of particle the particle moves from point A position vector to point B position vector If the magnitudes of these vectors are respectively r 3 and r 4 and the angles they make with the x axis are 0 75 and 0 15 respectively then find the magnitude of the displacement vector fafanu fars A folus fefa after B foffa f aff A B C D 9 1 18 31 42 75 15 a fazenda 15 13 17 15 2 P

The lengths and radii of two rods made of same material are in the ratios 1 2 and 2 3 respectively If the temperatu difference between the ends for the two rods be the same then in the steady state the amount of heat flowing per seco through them will be in the ratio 1 1 3 2 4 3 3 8 9 4 3 2

A liquid when heated in a copper vessel and when heated in a silver vessel the apparent coefficient of expansion is C and S respectively If coefficients of linear expansion of copper is A then the coefficient of linear expansion of silver is T3 TA L face a far safada fer farart qui fueran the facar quires A C S 3A 3 B C 3A S 3 C 3A S C 3 D C S 3A 3

A square is made of four rods of same material one of the diagonal of a square is at temperature difference 100 C then the temperature difference of second diagonal 100 Y 0 C 2 100 3 100 2 8 100 C

Two bodies A and B have thermal emissivities of 0 01 and 0 81 respectively The outer surface areas of the two bodies are the same The two bodies emit total radiant power at the same rate The wavelengths and 2 corresponding to maximum spectral radiancy in the radiation from A and B respectively differ by 1 00 m If the temperature of A is 5802K Find 2 0 01 0 81 and 3 A 31 00 m 5802K 2 fa A 1 5 10 m B 3 2 10 m C 5 10 m D 7 5 10 m Your Answ

How many meters of a thin wire are required to manufacture a solenoid of length 1 100cm and inductance L 1mH if the solenoid s cross sectional diameter is considerably less than its length 1 100 L 1mHaki R FIT A B C D fyrf da I S N BIERZENI su 1 0 km 0 10 km 0 010 km 10 km

Two electric bulbs A and B are rated as 60W and 100W If they are connected in parallel to the same source then AB 60 100 DA GA S CAR A Both the bulbs draw the same current GHIA VIRI yafed m B Bulb A draws more current than the bulb B C A B Bulb B draws more current than the bulb A BRA D Currents drawn by the bulls are in the ratio of their resistances fu

Maxwell s modified form of Ampere s Circuital Law is ter a few da B dA Eo B 3 d4 0 A 5 C E d d dt D E dos dt B di Eo Your Answer D

A wall consists of alternating blocks with length d and coefficient of thermal conductivity k and k The cross sectional area of the blocks are the same The equivalent coefficient of thermal conductivity of the wall between left and right is 1 K K 2 K K 2 d K K K K K K 3 K K K K 4 2 K K K K

Try Yourself 6 Resistivity of a conductor of length and area of cross section A is p If its length is dout and area of cross section is halved then its new resistivity will be 1 2 4p 3 P

The region in space with x y 2 R and z 0 has uniform volume charge density p If electric field at point 0 0 1 is E then the electric field at point 0 0 will be x y z R af far 0 0 2 da a faz 0 0 2 aga sa sim A B C D P PR E k 6 Eo E PR k 6Eo E PR PRK E 6E TR