Physics Questions

Solid cylinder r 5 cm 30 A solid cylinder of radius 5 cm is pure rolling o 30 inclined plane Find out angular velocity afte it travels 6m on incline plane 1 40 2 40 10 3 4 10 4 3 10

Assuming human pupil to have a radius of 0 25 cm and comfortable viewing distance of 25 cm the minimum separation between two objects that human eye can resolve at 500 nm wavelength is 100 m 1 m a c b 300 m d 30um

A cubical block is floating in a liquid with one third of it s volume immersed in the liquid When the whole system accelerates upwards with acceleration of g 2 A The fraction of volume immersed in the liquid will change 4 B The buoyancy force on the block will change C The buoyancy force will increase by 50 percent D The pressure in the liquid will increased in metallic shell s of radius R and 2R out of which the inner shell is having charge O

The intensity of gamma radiation from a given On passing through 36 mm of lead it is reduced to 8 urc be a 9mm b 6mm c 12mm I I thickness of lead which will reduce the intensity to 2 d 18mm The will

Two men A and B are standing on a plank B is at the middle of the plank and A is at the left end of the plank Bottom surface of the plank is smooth System is initially at rest and masses are as shown in figure A and B start moving such that the position of B remains fixed with respect to ground and A meets B Then the point where A meets B is located at A the middle of the plank C the right end of the plank 40 kg A 60 kg B 40 kg 120 cm Smooth B 30 cm from the left end of the plank D None of these

mp a 1 62 36 d 1 4 b 1 59 c 1 54 In a common base amplifier the phase difference betwe the input signal voltage and output voltage is d 0 a T b 4 c E N T 2

0 If a simple harmonic motion is represented by dt its time period is a 2 a b 2T a d x 2 c 2 ax 0 d 2

37 The diagram shows the energy levels for an electron in a certain atom Which transition shown represents the emission of a photon with the most energy a IV I II b III III IV c II n 4 n 3 n 2 n 1 d I

Two point charges 8q and 2q are located at x 0 and x Lrespectively The location of a point on the x axis at which the net electric field due to these two point charges is zero is a L 4 b 2L c 4 L d 8 L

3 The variation of density of a cylindrical thick and x long rod is P Po12 then position of its centre of mass from x 0 end is 1 2L 3 2 L 2 3 L 3 4 3L 4

a 25 Hz b 50 Hz 41 Two simple harmonic motions are represented by the equations y 0 1 sin 100nt a The phase difference of the velocity of particle 1 with respect to the velocity of particle 2 is W 3 b 539 F 0 c and y2 0 1 cos t TC 6 d TC 3

Two point white dots are 1 mm apart on a black paper They are viewed by eye of pupil diameter 3 mm Approximately what is the maximum distance at which these dots can be resolved by the eye Take wavelength of light 500 nm

5 A bullet of mass 10g moving horizontally with a velocity of 400 m s strikes a wooden block of mass 2 kg which is suspended by a light inextensible string of length 5 m As a result the centre of gravity of the block is found to rise a vertical distance of 10 cm The speed of the bullet after it emerges out horizontally from the block will be 1 120 m s 2 160 m s 3 100 m s 4 80 m s Two identical balls A and B having velocities of 2

An observer moves towards a stationary source of sound with a velocity one fifth of the velocity of sound What is the percentage increase in the apparent frequency a 0 5 b zero c 20 d 5

In a balanced wheat stone bridge current in the galvanometer is zero It remains zero when 1 battery emf is increased 2 all resistances are increased by 10 ohms 3 all resistances are made five times 4 the battery and the galvanometer are interchanged A only 1 is correct C 1 3 and 4 are correct B 1 2 and 3 are correct D 1 and 3 are correct

A swimmer wishes to cross a river 500 m wide flowing at a rate u His speed with respect to water is v For this he makes an angle with the perpendicular the direction of the flow of the river as shown For u 4 km h and v 2 km h and to minimize the drift the swimmer must flow a path in which should be B O 30 OO O 60

length is F The ratio F F will be a 3 4 b 2 1 c 1 2 d 2 3 NEET 2019 bast A 2001 An equiconvex lens has power P It is cut into two symmetrical halves by a plane containing the principal axis The power of one part will be P d a 0 c d P b 2 P the equivalent focal 4 DO 20

In Young s Double Slit Experiment when monochromatic source of light is used we get interference pattern which shows a black line on screen where a minima occurs Similarly a bright line for maxima In a typical YDSE set up the light source S is at distance 20 m and 40 m from the slits The light of wavelength 500 nm is incident on slits separated at a distance 10 m A screen is placed at a distance D 2m away from the slits as shown in figure S A sin D B sin 1 The value s of 0 relative to the central line where maximum appear on the screen 1 11 D 0 0 20 20 C sin P 1 10 C

hat describes same plane with the same 2 50 keV 4 100 keV ce there exists a uniform along x axis and uniform of strength B along ge q and mass m is rallel to x axis from a article reaches a point es 2v then E mv qB 11 3 2 VB 3 Move up and turn clockwise 4 Move up and turn anticlockwise Figure below shows a square loop of side 10 a on each side in the x y plane with its centre origin An infinite wire is symmetrically placed z 12 cm above y axis 1 65A N44 12cm Y i 78A 10cm Find the magnetic torque on the loop 1 72x10 3 Nm 3 72 10 6 Nm 2 720 10 3 Nm 4 720x10 6 Nm 1 3 mg sing T 943 mg cose N 43 10 A circular coil of radius 4m has coil a current of 2A is fowing its uniform magnetic field of 0 1 work done in rotating through equilibrium position is 1 0 1J 3 0 4 J

A particle of mass 0 3 kg subject to a force F kx with k 15 N m What will be its initial acceleration if it is release from a point 20 cm away from the origin a 15 m s b 3 m s c 10 m s d 5 m s

ABCDECA is a planar body of mass m of uniform thickness and same material The dimension are as shown in the figure The moment of inertia of the body about an axis passing through poin A and perpendicular to planar body is I and that of about an axis passing through C an perpendicular to planer body is I Then choose the correct relation a AK E a B D a C a

25 If S is stress and Y is young s modulus of material of a wire the energy stored in the wire per unit volume is a S 2Y b 2S Y c S 2Y d 2Y S

17 The variation of the velocity of a particle mov ing along a straight line is illustrated in the graph given below The distance covered by the particle in 4 seconds is ms 1 a 20 c 40 20 10 0 2 m 3 b 35 d 55

densities P P and P2 A large tank is filled with two immiscible liquids of A small hole is made at the base of the tank and the liquid of density p starts flowing out of it Three points A B and C are m rked on a vertical line Bernoulli s equation can be applied A B C D A P B P C h h Only at points A and C Only at points B and C At any two points A B and C None of these

A system goes from A to B via two processes I and II as shown in figure If A U and A U are the changes in internal energies in the processes I and II respectively then p 8 none II A a relation between AU and AU can not be determined b AU AU2 c AU AU ATT 1 ATT B

Which of the following is incorrect regarding the first law of thermodynamics a It is a restatement of the principle of conservation of energy b It is applicable to any cyclic process c It introduces the concept of the entropy D It introduces the concept of the internal energy

A coaxial cylinder made of glass is immersed in liquid of surface tension S Radius of inner and outer surface of cylinder are R and R respectively Then the rise of liquid between the cylinders is Density of liquid is p

4 Average density of the earth a is a complex function of g b does not depend on g c is inversely proportional to g d is directly proportional to g

Two concentric metallic shell s of radius R and 2R out of which the inner shell is having charge C and outer shell is uncharged If they are connected with a conducting wire Then A Q amount of charge will flow from inner to outer shell B Q e number of electrons will flow from outer to inner shell where e charge on electron KQ C amount of heat is produced in the wire amount of heat is produced in the wire D 4R KQ 2R

ducting wire bent in the form of a y 4x is shown in figure and current flowing in the wire is 3 A If the wire is placed in a uniform magnetic field B 4k T then magnetic force acting on the wire in newton is y m 1 48 3 96 3 A A 4 x m B 2 48 i 4 96 i

The bob of a simple pendulum is a spherical hollow ball filled with water A plugged hole near the bottom of the oscillating bob gets suddenly unplugged During observation till water is coming out the time period of oscillation would a first decrease and then increase to the original value b first increase and then decrease to the original value c increase towards a saturation value d remain unchanged

A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm Find the work to be done against the gravitational force between them to take the particle far away from the sphere you may take G 6 67 10 11 Nm kg a 3 33 10 10 J c 6 67 10 10 J b 13 34 10 10 J d 6 67 10 9 I

22 utbe d It introduces the concept of the internal energy Consider a car moving on a straight road with a speed of 100 m s The distance at which car can be stopped is HK 0 5 d 100 m a 1000 m b 800 m c 400 m mors m is accelerated uniformly from rest to a

250 When a particle is thrown horizontally th displacement of the projectile at any time t is give by 2 2 1 u g 2 3 u g t 1 2 u t S 2 2 4 u g t 2 4 2

The cross sectional area of a horizontal along its length linearly as moved in the direction of flow The variation of pressure as we move along its length in the direction of flow x direction can be best represented by the following graph P P A X X P P B D X X

An alpha nucleus of energy mv bombards a heavy 2 nuclear target of charge Ze Then the distance of closest approach for the alpha nucleus will be proportional to a v c 2 b E m

55 If the cold junction of a thermo couple is kept at 0 C and the hot junction is kept at T C then the relation between neutral temperature T and temperature of inversion T is AIPMT Prelims 2007 1 T T T T 2 2 T Tn 3 T 2T n

Consider the following reaction HHHH Yer The atomic masses are given as m H 1 007825 u m H 2 014102 u m H 3 016049 u 4 0 linn ofteaq The Q value of the above reaction will be 1 4 03 MeV OP 2 2 01 MeV 3 2 01 MeV 4 4 03 MeV

116 Extreme position to half of the amplitude A particle undergoes simple harmonic motion having time period T Find the time taken to complete 3 8 oscillation T The displacement of a particle executing simple harmonic motion is given by y 10sin 6t 3 Here

A point mass oscillates along the x axis according to the law x x cos oot 4 If the acceleration of the particle is written as a A cos oot 8 then 1 Axo 8 4 3 A x w 8 1 4 4 2 A x 0 8 4 4 A x 0 8 3 4 illator

Two objects A B of equal density and radius TA 1 mm and r 2 mm are moving in same medium then find the ratio of their terminal velocity VB B in the medium 2 1 2 VA 1 1 4 43 4 4 2

A bomb of mass 16kg at rest explodes into two pieces of masses 4 kg and 12 kg The velolcity of the 12 kg mass is 4ms The kinetic energy of the other mass is a 144 J b 288 J c 192 J d 96J

If B B B and B are the magnetic fields due to currents 1 12 13 and 14 respectively then in Ampere s circuital law B di l Bis 1 2 40 14 13 1 B B B 2 B B B 3 B B B B B 4 B B B

A radiation of energy E falls normally on a perfectly reflecting surface The momentum transferred to the surface is C Velocity of light 1 3 2E C E 2 4 2E

Initially spring is relaxed and m is released from rest When m come to rest for a moment string AB is cut at the same moment Find the acceleration of m just after cutting the thread A a m m 20 B a 2m m 000000 m m B A C a m 2m 3m 3m2 1 D a

EX A particle is dropped along the axis from a height f figure Find the maximum speed of image Sol VIM m VOM m gt where f f u f f f gt 2 2 dv For maximum speed dt 11 2f f gt v 0 t 3g 2f f gt V Imax on a concave mirror of focal length fas shown in 2 3 4 gt 3fg 4f gt f gt h 1 2 t 0 19

The current I drawn from the 5 volt source will be 1002 ww I a 0 33 A c 0 67A 5 Q 1002 5 volt 2002 www 1002 b d 0 5 A 0 17A

the body is vely charged 4 Calculate the charge on a body if two billion electrons are added t 10 10 lomb

The threshold frequency for a metallic surface corresponds to an energy of 6 2 eV and the stopping potential for a radiation incident on this surface is 5 V The incident radiation lies in a ultra violet region c visible region b infra red region d X ray region

The maximum velocity of a particle executing simple harmonic motion with an amplitude 7 mm is 4 4 m s The period of oscillation is a 0 01s c 0 1 s b d 10 s 100 s