Physics Questions

res A particle execute S H M with frequency f Find frequency with A particle of mass 10g is placed in potential field given by V 50x2 100 erg g What will be frequenc of oscillation of particle

m 4 A charged particle moving with some unknow velocity enters into an unknown uniform magneti field The kinetic energy of the particle 1 Increases 2 Decreases m 3 Remains constant 4 Depends on the value of intensity of field in proiecto

A particle of mass m is attached to one end of the light inextensible string and other end of the string is fixed in vertical plane as shown Now 5 particle is given horizontal velocity u gl then which of the following 2 statement s is are correct U A The string makes angle with the downward vertical is 60 when acceleration of the particle is horizontal B The tension in string is 2 mg when acceleration of the particle is horizontal 3 C The speed of the particle is gl when acceleration of the particle is horizontal 2 D The particle will not complete the circle

A particle describes SHM in a straight line about O OP If the time period of the motion is T then its kinetic energy at P be half of its peak value at O if the time taken by the particle to travel from O to P is 4 T 12 1 T T 2 T 3 2 2

A block of mass m placed on a smooth horizontal surface is attached to a spring and is held at rest by a force P as shown Suddenly the force P changes its direction opposite to the previous one How many times is the maximum extension of the spring longer compared to its initial compression SME

The electric outward and is given by E Ar A charge contained in a sphere of radius a centred at the origin of the field will be given by AIPMT 2015 1 Aa 2 4 Aa 3 A a

The SI unit of intensity of wave is 2 a W m W m b Jm s c 2 d Jm s U

Projectile motion on inclined plane up motion u Vor u usin 0 a t 0 O D 0 eucos a Ja Time of flight T Hax 2u a gcosa gsina ASCO ucose T gcosa 2usin 0 a cosa t T A B

Three identical spherical shells each of mass m and radius r are placed as shown in figure Consider an axis XX which is touching to two shells and passing through diameter of third shell Moment of inertia of the system consisting of these three spherical shells about XX axis is 1 3 mr 3 4 mr X 16 mr mr

1 direction shown are placed concentrically in the e conducting rings each having current in the same plane as shown in the figure The radii of rings are R 2R 4R 8R 00 Net magnetic field at the common centre O of rings will be 8 Ho R 2 Hol 2R 1 Ho sine 4nd 4pol nd si 14 3 Two gec magneti their id oscilla taken the F the ma 1 15

A Standard tuning fork contains frequency n another TF n have 20 more compared to no na 30 more compared to n n ng have beat relation of 6 beat sec Then determine no n ng

particle starts moving along a m with a constant tangential acceleration If he velocity of the particle is 120 m s at the end of he second revolution after the motion has begun me tangential acceleration is 1 40 m s 35 m s 45 m s 50 m s2 adius

7 A rod of weight W is supported by two parallel l edges A and B and is in equilibrium in a horizo position The knives are at a distance d from other The centre of mass of the rod is at dista x from A The normal reaction on A is 1 3 Wd X W d x d 2 4 W d x X Wx d

18 53 Based on equation E 2 178 107 J Z 2 n certain conclusions are written Which of them is not correct a Equation can be used to calculate the change in energy when the electron changes orbit b For n 1 the electron has a more negative energy than it does for n 6 which means that the electron is more loosely bound in the smallest allowed orbit c The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus d Larger the value of n the larger is the orbit NEET

20 A particle can be moved in the xy plane from O to P along different paths as shown in figure A force that continuously acts on the particle during its motion along any path is F 41 6j N Consider the action of only the given force and match column I and column II y Column I A Work done is 80 J B Mechanical energy is conserved C Linear momentum is not conserved D Angular momentum about O is non zero at some instant M N P 8m 8m L Column II P For the path OP Q For the path OLP R For the path OMP S For the path ONP T For the path OQP

Transverse waves can propagate 1 only in solids 2 both in solids and gases 3 neither in solids nor in gases 4 only in gases Light

In a constant volume gas thermometer the pressure of the working gas is measured by the difference in the levels of mercury in the two arms of a U tube connected to the gas at one end When the bulb is placed at the room temperature 27 0 C the mercury column in the arm open to atmosphere stands 5 00 cm above the level of mercury in the other arm When the bulb is placed in a hot liquid the difference of mercury levels becomes 45 0 cm Calculate the temperature of the liquid Atmospheric pressure 75 0 cm of mercury At constant volume po T P2 T2 P T 11 by attaching it P2 12 T 273 30 or T2 T 45 75 5 75 450 K 450 273

29 One mole of a gas isobarically heated by 40 K receives an amount of heat 1 162 kJ What is the ratio of specific heats of the gas a 1 7 b 1 4 c 1 3 d 1 5

Q3 A particle moves a distance x in time according to the equation x t 5 1 The acceleration of particle is proportional to CBSE AIPMT 2010 a velocity 3 2 b distance 2 c distance 2 d velocity 2 3

respectively Find the velocity of their centre of mass Two blocks of masses 5 kg and 2 kg placed on a frictionless surface are connected by a spring An external kick gives a velocity of 14 m s to the heavier block in the direction of the lighter one Calculate the velocity gained by the centre of mass binc forces rros 19 C M

A particle executing linear SHM Its time period is equal to the smallest time interval in which particle acquires a particular velocity v the magnitude of v may be Vmax B Vmax C A Zero 2 D Vmax 2

5 A uniform circular disc of radius 50 cm at rest is free to turn about an axis which is perpendicular to its plane and passes through its centre It is subjected to a torque which produces a constant angular acceleration of 2 0 rad s2 Its net acceleration in m s at the end of 2 0 s is approximately 1 8 0 2 7 0 3 6 0

What is the shape of the water different containers

53 When an unpolarized light of intensity I is incident on polarizing sheet the intensity of the light which does r d baget transmitted is a 10 b 22 10 c Io d zero

In the figure given below a hemisphere made of glass u 1 5 is shown Find the location of final image for the object O placed at a distance 40 cm from point P on the hemisphere Consider outside medium as air P 040 cm Hemisphere radius 40 cm 1 5

Q 142 Just after release of rod as shown on smooth horizontal track Find the ratio acceleration of point A and a is angular acceleration of rod just after release vertical 60 60 ammun smooth massless string 60 B uniform rod 2a la where a

10 An inductor L 0 03 H and a resistor R 0 15 k2 are connected in series to a battery of 15V EMF in a circuit showr below The key K has been kept closed for a long time Ther at t 0 K is opened and key K is closed simultaneously A t 1 ms the current in the circuit will be e5 150 6 7 mA 0 03 H vooo 15V K 0 15 k K b 0 67 mA

Two electric bulbs whose resistances are in the ratio of 1 2 are connected in parallel to a constant voltage source The powers dissipated in them have the ratio 11 2 2 1 3 21 4 1 4

Two vectors A and B are inclined at an angle 9 If A B and A B make angles a and B respectively with A then value of tana tan will be 1 2 3 4 2AB sine A B cos 0 2AB sin0 A B cos 0 A sin 0 A B cos 0 B sin 0 A B 2 cos 0

A particle moves in a circular path of radius R such that its speed v varies with distance x as v a x where a is a positive constant The acceleration of the particle after traversing a distance 2 R is 1 a 3 8 a 2 3 2 a 2 4 5 20 a

18 If Io is the intensity of the principal maximum in the single slit diffraction pattern then what will be its intensity when the slit width is doubled a 410 b 210 c Io 2 d Io

Example 16 Two identical billiard balls strike a rigid wall with the same speed but at different angles and get ref lected without any loss of speed as shown in Fig 5 19 What is i the direction of the force of the wall due to each ball and ii the ratio of the magnitudes of the impulses imparted on the two balls by the wall NCERT Delhi 161

10 A far sighted person can see object beyond 71 cm clearly if separation between glasses and eye 3 lens is 2 cm then find focal length of glass 1 23 cm 2 34 5 cm 3 18 4 cm 4 30 cm

38 If the kinetic energy of a free electron doubles it s de Broglie wavelength changes by the factor a 2 12 b 1 c 2 HAS d 2

a Be b 40 In a full wave rectifier circuit operating from 50 Hz mains frequency the fundamental frequency in the ripple would be a 25 Hz b 50 Hz c 70 7 Hz d 100 Hz 1 Two simple harmonic motions are represented by the

A y ray photon produces an electron positron pair If the rest mass energy of electron is 0 51 Mev and the total kinetic energy of electron positron pair is 0 78 MeV then the energy of Y ray photon in Mey is 1 0 78 2 1 8 3 1 28 4 0 28

A body A of mass M while falling 01 under gravity breaks into two parts a body B of mass 1 3 M 2 and a body C of mass M The centre of mass of bodies 3 a does not shift b depends on height of breaking c body B body B and C taken together shifts compared to that of body A towards

D All the above When the branch of a tree is shaken the ripe fruits get detached from the branch This is ar example of A Newton s first law of motion C Newton s third law of motion B Newton s second law of motion D All of the above

When two tuning forks fork 1 and fork 2 are sounded simultaneously 4 beats per second are heard Now some tape is attached on the prong of the fork 2 When the tuning forks are sounded again 6 beats per second are heard If the frequency of fork 1 is 200 Hz then what was the original frequency of fork 2 a 202 Hz b 200 Hz c 204 Hz d 196 Hz

A body of mass m is accelerated uniformly from rest to a speed v in a time T The instantaneous power delivered to the body as a function of time is given by a O mv 2 T 7 12 2 1 mv 2 b d mv 2 T 1 mv 2 t

7 A bar magnet has dimensions of 25 cm 10 cm anc 5 cm If length of magnet is 25 cm and its pol strength is 200 x 10 3 Am then intensity magnetisation of magnet is 1 40 A m 2 6 25 A m 4 80 A m 3 62 5 A m

The formula R radius of curvature R approaches infinity Hence becomes zero Substituting this in above R we get formula for the plane surfacesh 0 The distances u and y are measured from the plane of interface png V u a Water and glass together act as diverging lens b Water and glass together act as converging lens vu CLASSROOM PACKAGES CLARITY ACHIEVER IV A lemon kept in water in a glass tumbler appears to be bigger than its actual size when viewed in sides because I c Water acts as converging medium where as glass will act as diverging medium H Water acts as diverging medium where as glass will act as converging medium a Both A and c A is true B Assertion A Reason R object is pre a both A an b both A a c A is true When a parallel beam of light rays passes through an air bubble in water then it will become dive eam because The ray of a Real For a fish a farther c movin

In the circuit shown the current in the 192 resistor is 6V 3 0 a 0 13 A from Q to P c 1 3A from P to Q P 202 W 102 9V 2 30 b 0 13 A from P to Q 0 08

13 On closing the switch S the amount of charge flows from A to B is 10 C 10 C A 1 5 C 2 F S 1 F 2 10 C B 5 C 5 C

are ideal 3 2 g ILB ILB ug Block m X X XI I I X X X 1 I Minimum value of mass m of block to pu square frame in equilibrium is 1 2 X X XI ILB 2 g x B 4 2ILB

7 Two boys are left in the middle of a frictionless floor A boy of mass 20 kg gives a blow lasting for one millisecond of 100 kN to the other He himself will move with a velocity of a 1 ms b 0 5 ms d 0 005 ms 1 c 0 01 ms Ahody of mass 1 kg moving on a smooth horizontal surface with velocity 5 ms is to be brought

27 A sonometer wire is to be divided into three segments having fundamental frequency in the ratic 1 23 the ratio of lengths should be 2 4 3 1 4 6 3 2 1 3 2 1 3 4 2 3

In a series resonant LCR circuit the voltage across R is 100 volts and R 1 k2 with C 2uF The resonant frequency w is 200 rad s At resonance the voltage across Lis a 2 5 10 2 V b 40 V c 250V d 4 10 V

In a common base mode of a transistor the collector current is 5 488 mA for an emitter current of 5 60 mA The value of the base current amplification factor B will be a 49 b 50

3 He has given me a novel 4 I promised him a reward 5 I taught him a lesson