Physics question and answers for July 08, 2024
- Q The particle is moving in a spherical symmetric potential r ar Here w constant Express the average potential energy of the particle in terms of the aven kinetic energy Answer...
- Q 16 A radioactive nucleus Po210 decays to a stable nucleus Pb206 Then time graph of rate of formation R of Pb206 against time t is best shown by R R...
- Q If the frequency of light incident on a metallic plate be doubled how will the maximum kinetic energy of the photoelectrons change 1 It becomes more than double 2 It...
- Q Two spherical vessel of equal volume are connected by a n arrow tube The apparatus contains an ideal gas at one atmosphere and 300 K Now if one vessel is...
- Q 7 A painter ladder is formed by joining two uniform ladders each 3m long and weighing 150 N Both the ladders are hinged at the apex and are held together...
- Q A monochromatic point source of light is placed at a distance d from a metal surface Photo electrons are ejected at a rate n per second and with maximum kinetic...
- Q A light rod of length L is hinged to a plank of mass m The plank is lying on the edge of a horizontal table such that the rod can...
- Q 2 a nuclear fusion process the masses of fusing nuclei be m and and the mass of product nuclei be m then m stion ape 1 m m m 2...
- Q Figure shows electric field lines in which an electric dipole p is placed as shown Which of the following statements is correct 9 a The dipole will not experience any...
- Q a 0 b 45 3 Two simple pendulums of length 0 5 m and 20 m respectively are given small linear displacement in one direction at the same time They...
- Q 13 180 An AC circuit having supply voltage V consists of resistor of resistance 4 Q and capacitor of reactance 3 Q as shown in the figure The voltage across...
- Q Consider the circuit shown in fig With switch S closed and the other two switches open the circuit has a time constant 0 05 sec With switch S closed and...
- Q A point charge q is placed at a distance 2r from the centre O of a conducting neutral sphere of radius r Due to the induced charge on the sphere...
- Q The cathode of a photocell Is work function changes from w to w w If the saturation currents before and after the change are I and 2 and all other...
- Q In the circuit shown when the input voltage of the base resistance is 10 V VBE is zero and VCE is also zero The value of is 10 V R...
- Q 2 Two similar coils are kept mutually perpendicular such that their centres coincide At the centre find the ratio of the magnetic field due to one coil and the resultant...
- Q 57 In a circuit L C and R are connected in series with an alternating voltage source of frequency f The current leads the voltage by 45 The value of...
- Q An a particle accelerated through V volt is fired C towards a nucleus Its distance of closest approach is r If a proton accelerated through the same potential is fired...
- Q A 4 pole d c shunt motor has a flux per pole of 0 04 Wb and the armature is lap wound with 720 conductors The shunt field resistance is...
- Q A wheel of mass M and radius r having charge Q uniformly distributed over its rim is rolling on rough horizontal ground without slipping about a light rod of length...
- Q 8 The beam shown in the figure has negligible weight If the system hangs in equilibrium when W 400 N calculate the value of W Take sin 20 0 34...
- Q You have 10 23 carbon atoms Imagine that all the nuclei are put at north pole of the earth and electrons at the south pole of the earth radius 6400km...
- Q The work function of a substance is 4eV The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately 1 540 nm 2 400...
- Q 9 If the threshold wavelength for a metal is 6200 A then minimum energy required to eject an electron from the surface of metal is nearly 1 1 eV NCERT...
- Q 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...
- Q A charge particle is projected with velocity v 41 31 m s in a region of space where uniform electric field 3 i 5 5 exist Motion of charge particle...
- Q When a metallic surface is illuminated with light of wavelength the stopping potential is x volt When the same surface is illuminated by light of X 3 wavelength 22 the...
- Q The motion of a body of mass 2 kg is depicted graphically as shown in the given figure then the magnitude of net force acting on the body is A...
- Q An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter If alg 1 5 the distance of bubble from...
- Q A particle having charge q and mass m moving with velocity Venters a region of magnetic field B and electric field The motion of the particle will be Given V...
- Q President Duterte is driving his BMW motorcycle mass 980 kg and wants to accelerate from 18 m s to 32 m s is 7 seconds President Duterte is amazed of...
- Q 22 Two parallel conducting rails separated by a distance I are fixed on a plane surface inclined at an angle a to the horizontal as shown in figure Copper rod...
- Q 2 Given that a photon of light of wavelength 10000 has energy 1 23 eV Now when light of intensity and wavelength 5000 falls on a photo cell the saturation...
- Q 21 A uniform but time varying magnetic field B t exist in a circular region of radius R and is directed into the plane of the paper The magnitude of...
- Q Two bodies A and B of masses 20 g and 15 g respectively are on a horizontal plane A is at rest and B is moving at 5 ns to...
- Q A plastic rod of length 1 0 m carries uniform positive charge 4 0 C on half of its length and uniform negative charge 4 0 C on the remaining...
- Q 11 An insulating rod of length 1 carries a charge q distributed uniformly on it The rod is pivoted at an end and is roated at a frequency f about...
- Q esistance ed in it gnitude 0 lio d b 2 5 mJ O 1 coil of inductance L 50 H and resistance 0 52 is connected to a battery of...
- Q A proton of charge e and mass m enters a uniform and constant magnetic field B B with an initial velocity V Vox Vor Which of the following will be...
- Q 5 When photon of energy 3 8 eV falls on metallic surface of work function 2 8 eV then the kinetic energy of emitted electrons are 1 1 eV 3...
- Q 2 Figure shows two identical magnetic dipoles P and Q of magnetic moment M each placed at a separation 2d with their axes parallel to each other The magnetic field...
- Q 3 A circular coil is in y z plane with centre at origin The coil is carrying a constant current Assuming direction of magnetic field at x 25 cm to...
- Q Will power not depend on the res stance of apparatus 27 An apparatus is connected to an ideal battery as shown in figure For what value of current power delivered...
- Q nC m Let there be a non conducting infinite large sheet of charge of surface charge density 36T uncharged conducting spherical shell of radius 20 cm is placed in front...
- Q TO 45 O There exists a magnetic field in a cylindrical region of radius R The magnetic field is increasing at a constant rate a with respect to time The...
- Q A metal block of mass m slides on a horizontal surface which is lubricated with oil Assume that the initial velocity of the block is v at x 0 and...
- Q 71 A man stands on a frictionless horizontal ground He slides a 10 kg block on the surface with a speed of 3 m s relative the ground towards a...
- Q The true value of the angle of dip at a place is 0 If the plane of the dip circle is at 30 with the magnetic meridian the angle of...
- Q The photoelectric work function 1 Is different for different materials 2 Is same for all metals 3 Depends upon frequency of the incident lig 4 Depends upon intensity of the...
- Q Y An electron is to be accelerated from a velocity of 1 00x10 m s to a velocity of 7 50x10 m s Through what potential difference must the electron...
- Q The photoelectric threshold for a certain metal surface is 330 What is the maximum kinetic energy of the photoelectrons emitted if radiations of wavelength 1100 are used 1 1 eV...
- Q A triangular loop of side carries a current i It is placed in a magnetic field B such that the plane of the loop is parallel to magnetic field The...
- Q The wedge shown can slide without friction on a horizontal floor Mass of the wedge is M and its angle of inclination is 30 A block of mass m slides...
- Q While looking from the window you witness a squirrel moving with the speed of 18 m s on a horizontal ground The squirrel slides a distance of 18 m until...
- Q A particle starts from rest at t 0 and moves in a straight line with an acceleration as shown below The velocity of the particle at t 3 s is...
- Q 7 A tennis ball of mass 150 g is thrown towards a wall at a velocity of 10 m s It is hit back in the opposite direction with a...
- Q 5 Two trains each of length 100 m moving in opposite directions along parallel lines meet each other with speeds of 50 km h and 40 km h If their...
- Q 34 A charged particle moves along a circle under the action of possible constant electric and magnetic fields Which of the following are possible 1 E 0 B 0 2...
- Q A 90kg 120Kg 50 B 40Kg What is of Mr Incredible s feet so he stays in equilibrium a Determine the acceleration of the system if is less than your...
- Q 6 A box of mass 20 kg is sliding along the inclined plane which makes an 60 with the ground What is the magnitude of the Normal Force Assume g...
- Q a photoemissive cell with executing wavelength the fastest electron has speed v If the exciting wavelength is changed to 3 4 the speed of the fastest emitted electron will be...
- Q A particle is moving on a straight line with a speed of about 0 5 m s To measure its speed points are marked on the line of motion which...
- Q Find the velocity and the position as functions of the time for a particle of mass m which starts from rest subject to the following force function F x Fosinct...
- Q A cell is connected between the points A and C of a circular conductor ABCD of same material with centre at O If B and B2 are the magnitude of...
- Q The bob of a pendulum is 0 2 kg It is hung by mean of 1 2 m string from the ceiling If it is pulled horizontally and make a...
- Q A 100 ohm resistor is connected in series with a 4 H inductor The voltage across resistor is Vo 2 sin 1900 The voltage across inductor is 1 60 sm...
- Q kinetic energy 4 mu of the molecules p is not always equal to p The average of a squared quantity is not necessar the square of the average Can you...
- Q The electric field in an electromagnetic wave is given by E 50 N C sino t x c Find the intensity of the wave 1 3 3 W m 3...
- Q A potential difference of 600 V is applied across the plates of capacitor the separation between the plates is 3 cm An electron is projected parallel to plates with velocity...
- Q 20 A circuit containing resistors and an inductor Find the values of i soon after the switch S is closed and long after the switch S is closed 150 V...
- Q Two spheres A and B of exactly same initial mass are given equal positive and negative charges respectively Their masses after charging Remains unaffected Mass of A mass of B...
- Q A wheel having moment of inertia 12 kg m about an axis is rotating at 180 rpm If the wheel is stopped in a time of 10 second how much...
- Q Two beams of light having intensities 41 and 9 interfere to produce an interference pattern on a screen The phase difference between the beams is 2 at point A and...
- Q Photoemission by Black Body Radiation A black body emits peak spectral intensity at 9000 On increasing its temperature total radiation power increases by 81 times At the initial temperature when...
- Q De excitation of a moving hydrogen atom Consider a hydrogen atom with its electron excited to nth state moving at speed v c It emits a photon in the direction...
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