Physics Questions

93 In the diagram the input is across the terminals A and C and the output is across B and D Then the output is A a zero c full wave rectifier B C D b same as the input d half wave rectifier

25 For a particle in uniform circular motion the acceleration a at a point P R 0 on the circle of radius R is here 0 is measured from the X axis v a b c 10 WAWA R v cos e sine i R sin ei cos e i 2 v v R v R cos e j sin e j

A water tank standing on floor has two small holes punched in vertical wall one above the other The holes are 2 4 cm and 7 6 cm above the floor If the jet of water from holes hit the floor at the same point then height of water in tank is 10 cm 5 cm 2 5 cm 6 8 cm

Which of the following gates will have an output of 0 00 C 1 d Question Type Single Correct Type 2 a 3 b 00 10 4 c 00 00 b 6

1 An ionised H molecule consists of an electron and two protons The protons are separated by a small distance of the order of angstrom In the ground state a the electron would not move in circular orbits b the energy would be 2 4 times that of a H atom c the molecule will soon decay in to a proton and a H atom d none of these

A small satellite is in elliptical orbit around Earth as shown If L denotes the magnitude of its angular momentum and K denotes kinetic energy L L and K K L L and K K L L and K K Earth

Three products are being considered as possible thermal The thicknesses insulators conductivities of the three products are as follows Product I Product II Product III Conductivity arbitrary units arbitrary units 12 6 Thickness 2 and For a given cross sectional area which product would make the best thermal insulator Product I 2 Product II 3 Product III they would all give the same insulation

Q14 A beam of electrons of velocity 6 00 x 10 m s is made to strike a metal target in the Coolidge tube to produce x rays The minimum wavelength of the x ray is O A 0 121 nm O B 0242 nm c 0 024 nm D 0 012 nm

Q Nos 10 11 are based on the following paragraph A nucleus of mass M Am is at rest and decays into two daughter nuclei of equal mass M each 2 Speed of light is c 10 The binding energy per nucleon for the parent nucleus is E and that for the daughter nuclei is Then a E 2E c E E b E E d E 2F

Q12 A person is carrying a box applying a force of 10N He walks horizontally across a distance of 2 m and then climbs up vertically through a distance of 5m What is the total work don him O A 0 O B 50 J O C 70 J O D 20 J

Question No 25 The ammeter reading in the following circuit will be 6 0 wwww 202 2V wwwww 60 O 602 wwwwww 01 A 8 0 3 A 4 2 02A

Q6 The coordinate time graph of an object is a straight line with a positive slope The object has O A Steadily increasing acceleration O B Steadily increasing velocity O c Constant acceleration O D Constant velocity

Q9 A block of mass mis connected to two springs of force constants k and k as shown in figure The block moves on a frictionless table after it is displaced from equilibrium and releas The block exhibits simple harmonic motion with period A O B O C T 2n T 2n D T 2n m 772 k kq T 2n m k k kykz 2m 3 k k kyky m k k

An electromagnetic wave of frequency 1 10 4 hertz is propagating along z axis The amplitude of electric field is 4 V m If 8 8x10 12 C N m then average energy density of electric field EE 160E it 2014 will be A 35 2 10 13 J m C 35 2 10 11 J m Thi CH B 35 2x10 12 J m D 35 2 10 10 J m C

A certain mono atomic gas undergoes the process PV Here Q Heat supplied to the gas W work done by the gas AU change in internal energy of the gas The ratio for the process will be 2 The ratio IfAT W AU The molar specific heat capacity for the process is R for the process will be 1 3 Constant 100K and AU is 450 R joules then the number of moles of the gas must be 3

uestion No 7 This section has 7 questions Each question has FOUR options A B C and D Only ONE of Marking scheme o 3 if the correct option is selected o 1 in case if selected typed option is incorrect o 0 in case if no responses typed selected Referring to the shown circuit the current will be minimum in 212 Physics Se a

Example 22 Current is flowing in a wire frame kept as shown in the figure where EDCF is in y z plane and AFC is in x z plane Current in the wire frame is i and length of each side is a Find the magnetic mome Imon J plez plution as you Above wire frame can be seen as composed of two rectangular wire frames where current CF of loop EDCF cancels current FC in AFCB Magnetic moment M M M J Mis magnetic moment of AFCB C M ia j M2 is magnetic moment of FEDC M ia i So M ia i i Z E 9 GEZ A B Imp The electron of charge e perform constitutes a current I in the loop The current in the loop The magnetic moment u ass 1 According to Bohr s model Imp 1 T Here L is the angular inom 20 Vectorially Tim

A mild steel wire of length 2L and cross sectional area A is stretched within elastic limit horizontally between two pillars as shown in the figure A mass m is suspended from the mid point of the wire Strain in the wire is

Q1 A uniform pressure of 7 0x105 N m is applied to all six sides of a copper cube What is the percentage change in volume of the cube for copper B 14x100 N mm O A 0 4 x 10 2 O B 0 5 x 10 3 O C 24 x 10 2 O D 8 4 x 10 2

Q10 The expression Ex Sml becomes dimensionally correct if and only if where E Kinetic energy h plank s constant m mass of an object L length A h should be replaced by h B m should be replaced by m C h should be replaced by h D should be replaced by L

The first diffraction minima due to a single slit diffraction is at 8 30 for a light of wavelength 5000 A The width of the slit is Question Type Single Correct Type 1 5 x 105 cm 2 1 0 x 104 cm 3 2 5x 105 cm English Review Q 4 1 25 x 105 cm

The value of a a and 3 are current gain in CB CE configuration Question Type Single Correct Type 2 a B G 3 1 is equal to None of these

Q7 Young s modulus of a material is defined as ratio of stress and strain If strain of the material is increases by two times the Young s modulus of the mater O A Increases by two times B No change in the Young s Modulus C Decreases by two times O D Increases by four times

Q2 In a given process of an ideal gas dW 0 and dQ 0 Then for the gas O A The temperature will decrease O B The temperature will increase O C The pressure will remain constant O D The volume will increase

A water jet whose cross sectional are is a strikes a wall making an angle 0 with the normal and rebounds elastically The velocity of water of density d is v Force exerted on wall is 1 2 av d cose 2 aud coff 0 0 2 2 av d sin0 4 ayd cose

ple 23 A current carrying circular loop of radius R is placed in a uniform magnetic field B Tesla in x y plane as shown in figure The loop carries a current i 1 A in the direction shown Find the torque acting on the loop V ANS on V M TR K T B B cos 45 i B sin 45 j t MxB VED BY R kx i j 2 AIDUAL CAMERA TR B i 1 2 makanya kalau 45 V crock wise ve sign 2021 08 21 15 38

A car is moving with 54 km h speed at t 0 Its break produces the retardation of 2 5 m s If he applies break at t 0 and produces constant retardation till car stops then the displacement travelled by car in X 10 sec is X Fill

A man wishes to cross a river of width 120 m by a motorboat His rowing speed in still water is 5 m s He takes t seconds to cross the river and reach to the point directly opposite to his starting point Speed of water is 3 m s Find t

Activity 3 Ohm s Law at Home Directions Read and understand the situation below Write your answers on a separate sheet of paper In the Philippines an electric energy distributor supplies each household 220 volts of voltage and 60 A of current Applying your knowledge on Ohm s Law in what way your appliances be used at home to maintain a safe amount o current 2 points 1 point Rubric for Scoring The answer is consistent with the concept of Ohm s Law The answer is not consistent with concept of Ohm s Law

A single conservative force F x acts on 1 kg particle that moves along x axis The potential energy U x is given by U x x 2 20 Where x is in meters and U x in joules If particle has a kinetic energy of 20 J at x 5 find mechanical energy in joules at x 2m

hoose true or false for each statement regarding convex mirrors If an object is placed 3 9 cm from a convex mirror with f 4 cm then its image will be reduced and virtual A convex mirror produces an enlarged virtual image when the object is placed far beyond its focal point Regi If an object is placed 8 1 cm from a convex mirror with f 4 cm then its image will be enlarged and virtual

A the figure a ball A is released from rest when the spring is at its natural unstretched length For the block B of mass M to leave contact with the ground at some stage the minimum mass of A must be mk nig F ma zelle voo A for m v 4

Initially spring is compressed by 0 5 m and surface is smooth Choose the correct option s Initial potential energy in spring is 12 5 J Kinetic energy of block A when spring is at natural length for first time is 12 5 J Work done by all forces on B is zero till spring attains it s natural length for first time None of these A B 100 N m 2kg 000000000000 2kg

Can it be fixed 15 minutes ago of A bullet is fired from a gun The bullet travels a distance L 235 0 5 m during a time interval t 0 5 0 04 The speed of the bullet in m s can be calculated using the formula Speed L t Calculate the a Speed of the bullet in m s b Fractional uncertainty in the speed c Absolute uncertainty in m s in the speed 9

In the figure shown ground smooth whereas surface between 3 kg block and 2 kg block is rough A force of magnitude 10 N is applied on 3kg block horizontally If net work done by friction on the system on 3 kg and 2 k blocks in any time frame is zero then coefficient of friction between 3 kg and 2 kg can be 0 1 03 04 2kg 3kg Rough 10N Smooth

A block of mass 2 kg initially is at rest on a rough surface having coefficient of friction p 0 5 A force 20N is applied as shown in figure then which of the following is are CORRECT 20N 0 Acceleration of block is 6m s Work done by applied force F when block has moved by 2m is 323 Work done by kinetic friction when block has moved by 2m is 8 J Magnitude of normal contact force applied by block on the ground is BN 2kg F 0 5

a sv ww R b 10 V 12 V 1 2 c only 3 www Question Type Single Correct Type Q Game 5 V a and c a b and d b and d R 9 10 V are

The threshold frequency for a certain photosensitive metal is vo When it is illuminated by light of frequency v 200 the maximum velocity of photoelectrons is vo What will be the maximum velocity of the photoelectrons when the same metal is illuminated by light of frequency v 5v0 O 2vo 0 240 O 2 2vo 0440 Marks 4 1

the disc s to rest tween e two tant 5 47 A small ball is suspended from a point O by a light thread of length 7 Then the ball is drawn aside so that the thread deviates through an angle 0 from the vertical and set in motion in a horizontal direction at right angles to the vertical plane in which the thread is located What is the initial velocity that has to be imparted to the ball so that it could deviate through the maximum angle 2 in the process of motion Ans 2gl sec 0 www

An air bubble in glass u 1 5 5 is situated at a distance 3 cm from a convex surface of diameter 10 cm as shown The distance from surface at which the image of bubble appears is 1 5 3cm 1 4 I 1 2 5 cm 2 5 cm 3 4 cm 4 1 5 cm Aray of light is incident at angle of 60 on a cm fi th V W 14 Telegram neetqstion paper 3 3 4 A

Two radio active substances A and B have decay constant 52 and respectively At t 0 they have the same number of active nuclei The ratio of number of active nuclei of A to those of B will be 1 e2 after a time interval O 4 O 22 O 122 Marks 4 1

A 2 volt battery a 15 Q2 resistor and a potentiometer of 100 cm length all are connected in series If the resistance of potentiometer wire is 5 02 then the potential gradient of the potentiometer wire is O 0 005 V cm O 0 05 V cm O 0 02 V cm O 0 2 V cm Marks 4 1

A particle P performs circular motion such that its position vector F makes an angle 0 with x axis according to following equation e F 6t 8 rad Att 0 particle is at point A Particle changes its direction of motion only once O Particle does not change it s direction of motion Angular acceleration of particle is constant

Focal length of a convex lens of refractive index 1 5 is 2 cm Focal length of lens when immersed in a liquid of refractive index 1 25 will be 1 5 cm 3 10 cm 2 7 5 cm 4 2 5 cm

A particle moves with a velocity V 51 31 6k m s under the influence of a constant force F 101 10 20 k N The instantaneous power applied to the particle is in J s Backspace

cm 3 4 cm 2 5 cm 4 1 5 cm A ray of light is incident at angle of 60 on a 3cm thick plate u 3 The shift in the path of the ray as it emerges out from the plate is in cm 1 1 3 0 5 2 1 2 4 1 8

0 375 x 18 x 10 6 75 X mple 9 A magnetic dipole of magnetic moment M is placed on the axis of a current carrying circular la of radius R at a distance x from the centre Find the force acting on the dipole

A black hole is an object whose gravitational field is so strong that even light cannot escape from it To what approximate radius would earth mass 5 98x1024 kg have to be compressed to be a black hole 1 10 m 2 106 m 3 10 2 m 4 100m 24M

choose the one that best describes the two statements Statements 1 Out of the radio waves and microwaves the radio waves undergo more diffraction Statement 2 Radio waves have greater frequency compared to microwaves A Statement 1 is true Statement 2 is true Statement 2 is the correct explanation of Statement 1 B Statement 1 is false Statement 2 is true C Statement 1 is true Statement 2 is false D Statement 1 is true Statement 2 is true Statement 2 is not the correct explanation of 2013 Statement 1

Two strings of linear mass densities u and 9u are stretched under same tension A wave travelling on the lighter string towards the heavier string gets partially reflected and transmitted at the junction Then fraction of incident wave energy getting transmitted to the heavier string is 1 11 3 4 9