Physics Questions

When the system shown in the diagram is in equilibrium the rigth spring is stretched by 1 cm The coefficient of static friction between the blocks is 0 3 There is no friction between the bottom block and the supporting surface The force constants of the springs are 150N m and 450 N m refer figure The blocks have equal mass of 2kg each Find the maximum amplitude in cm of the oscillations of the system shown in the figure that does not allow the top block to slide on the bottom M 450 N m 0000 m 150 N m m 0000 AYAT

A student performs an experiment for determination of l 9 47 0 and in time T is AT and n is number of times the reading is taken The measurement of g is most accurate for A B C Al 5mm AT 0 2sec n 10 The error in length lis Al Al 5mm AT 0 2sec n 20 Al 5mm AT 0 1sec n 10 se 1mm AT 900 50

8 A small body is thrown at an angle to the horizontal with the initial velocity vo Neglecting the air drag find a the displacement of the body as a function of time r t b the mean velocity vector v averaged over the first t seconds and over the total time of motion

we apply When a car is acclerated force then pseudo force is opposite direction In that it is non innertial frame So when we consider its tota system then it s innertial frame And net force is zero But in this system force has present and accleration also Total system we consider inertial frame and net force is zero

The focal lengths of the lenses of an astronomical telescope are 50 cm and 5 cm If the image is formed at the least distance of clear vision then the length of the telescope is 275 1 cm 6 3 55 cm 325 6 4 45 cm 2 cm

Two concentric shells have radii R and 2R charges q and qB and potentials 2V and 3 2 V respectively Now shell B is earthed and let charges on them become and Then B A O 9A 9B 1 2 O Potential of A after earthing becomes 3 2 V 4 O None of these

5 Using screw gauge of pitch 0 1 cm and 50 divisions on its circular scale the thickness of an object is measured It should correctly be recorded as 1 2 121 cm 3 2 125 cm 2 2 124 cm 4 2 123 cm

Two blocks of mass 20 kg and 10 kg are connected by a massless string as shown in the figure How much time will 20 kg block take to travel 0 6 m distance when released from rest Take gravitational acceleration as 10 m s 1 0 2 s 10 kg 20 kg 2 0 4 s

Three concurrent forces of the same magnitude are in equilibrium What is the angle between the force Also name the triangle formed by the force as sides A 60 equilateral triangle B 120 equilateral triangle C 120 30 30 an isosceles triangle D 120 an obtuse angled triangle

In a simple microscope f 6 cm the final image is produced at infinity Eye is placed at a distance of 1 cm behind the lens D 25 cm Magnification produced is 1 6 3 5 0 2 5 5 4 4

47 Critical angle of glass air interface is 0 and that water air interface is 02 The critical angle for glas edeconser 1 water interface would be 1 a 1 less than 0 3 greater than 3 2 between 0 and 0 4 lose than a

5 Find the resultant of the following two vectors A and B A 40 units due east and B 25 units 37 north of west A 25 units 37 north of west C 40 units 53 north of west passo T B 25 units 37 north of east D 40 units 53 north of east

body is projected from ground at speed v at an angle above horizontal Radius of curvature of its path at the highest point is 1 2 3 v cos e 2g V cose g v cos 0 g

In free space a particle is projected from a point P on axis of a fixed rigid cone AOB at an angle a 37 with the axis see figure Distance of point P from the apex O is x 10 cm and the apex angle of the cone is 8 20 All the collisions of the ball with the cone are perfectly elastic Find the distance of closest approach of the ball from the apex in centimeters B P A O

C 15 A bucket has oil of density 1 2 g c c upto a height of 3 cm On top of the oil is a water column of height 10 cm If density of mercury is 13 6 g c c the pressure at the bottom of the beaker due to liquids is C P M T 1993 1 1 cm of mercury 2 5 cm of mercury 3 13 cm of mercury 4 15 cm of mercury

A paramagnetic material had a magnetic field intensity of 105 A m If the susceptibility of the material at room temperature is 4 5 103 calculate the flux density in the material 12 61 x 104 Wb m 12 61 x 10 2 Wb m 12 61 x 10 3 Wb m 12 61 x 10 1 Wb m Test time

9 If the size of an image formed by a convex mirror of focal length fem is 1 nth of the size of the object then calculate the distance of the object from the mirror when n 1 Ans n 1 fcm

A particle of mass m and charge q is fastened to one end of a string fixed at point O The whole system lies a frictionless horizontal plane Initially the mass is at rest at A A uniform electric field in the direction shown then switched on Then A E 60

If initially flux through hemisphere is zero Now 9 and 92 placed according to figure Due to which charge flux through hemisphere will change Question Type Single Correct Type 1 Only 91 9 92

3 An combination of a concave and convex lens has power 5 D If the magnitude of focal length of concave lens is 100 cm the power of convex lens is 1 1 D 3 4 D 2 2 D 4 6 D

Two point charges q each are fixed at a 0 and a 0 A third charge Q is placed at origin Electrostatic potential energy of the system will O Increase if Q is slightly displaced along x axis O Increase if Q is slightly displaced along y axis O O D crease if Q is slightly displaced along x axis Remain constant if Q is slightly displaced along y axis

A positive charge Q is fixed at a point A Another positively charged particle of mass m and charge q is projected from a point B with velocity u as shown in the figure The point B is the large distance from A and the distance d from the line AC The initial velocity is parallel to the line AC The point C is a very large distance from A The minimum distance in meters of q from Q during the motion is d 1 A Find the value of A Take Qq 47 omu d and d 2 1 meter B d

24 0 3 A vector B which has a magnitude 8 0 is added to a vector A which lie along the x axis The sum of these two vectors is a third vector which lie along the y axis and has a magnitude that is twice the magnitude of A The magnitude of A is 8 A 5 B 4 5 C 2 5 Infusib D 6 5

If an object moves towards a plane mirror with a speed v at an angle 0 to the perpendicular to the plane of the mirror find the relative velocity between the object and the image 0 1 V 2 2v 3 2x cosA 0 X

A and B are two conducting concentric spherical shells A is given a charge Q while B is uncharged If now B is earthed as shown in figure Then which statement is incorrect O B The charge appearing on inner surface of Bis Q O The field between A and B is not zero O The field inside and outside A is zero The charge appearing on outer surface of B is

White light is incident on the interface of glass and air as shown in the figure If green light just undergoes total internal reflection then the emerging ray in air contains Air Glass White 1 Yellow orange red 2 Violet indigo blue 3 All colours Green Telegram o

A point charge q is placed at origin Let E E and be the electric fields at three points A 1 2 3 B 1 1 1 B and C 2 2 2 due to charge q Then O ELEB O E 8 Ec O E Ec O None of these

1 An astronomical telescope for normal adjustment has magnitude of magnifying power 24 and tube length 150 cm The focal lengths of eye piece and objective lens are respectively 1 144 cm and 6 cm 3 6 cm and 144 cm 2 120 cm and 30 cm 4 30 cm and 120 cm

An electric dipole of dipole moment 10 6C m is released from rest in uniform electric field 10 V m at angle 0 60 Maximum rotational kinetic energy of the dipole is say K and maximum torque during the motion is then O K 5 0 x 10 5 J O T 5 0 x 10 N m 19 dan y O K 2 0 x 10 J O None of these

4 30 km 221 A particle is moving along a straight line its position varies x 6a t asin ba t a sin where x is its position 1 t a 2 with time t as metre t is time in s and a is a positive constant The particle comes to rest at T 2 t a 3 t n 4 t 0 in d en ont ats si

An electric dipole moment p 201 30 C mis placed in a uniform electric field 301 20k 10 NC X mark incorrect statement O The torque that exerts on is 0 67 0 47 0 9k Nm O The potential energy of the dipole is 0 6J O The potential energy of the dipole is 0 6J If the dipole is rotated in the electric field the maximum potential energy of the dipole is 1 3J

5 Two plane mirror are inclined at angle 0 as shown in figure If a ray parallel to OB strikes the other mirror at P and finally emerges parallel to OA after two reflections then 0 is equal to A 44 www 0 TB

A microammeter has a resistance of 100W and a full scale range of 50 A It can be used as a voltmeter or a higher range ammeter provided a resistance is added to it Pick the correct range and resistance combination s 1 10V range with 200 kW resistance in series 2 50V range with 10 kW resistance in series 3 5 mA range with 1W resistance in parallel 4 10 mA range with 1 kW resistance in parallel

b How much work is required to separate the two charges infinitely away from each other c Suppose that the same system of charges is now placed in an external electric field E A 1 r A 9 x 105 C m2 What would the electrostatic energy of the configuration be Solution a U 4 1992 9 10 x r Scanned by TapScanner 7x 2 x10 2 0 18 0 7 J b W U U 0 U 0 0 7 0 7 J c The mutual interaction energy of the two charges remains unchanged In addition there is the energy of interaction of the two charges with the external electric field We find

5 A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angle is equal to 3 The angle of deviation is 1 45 3 39 of the angle of prism 2 70 4 30

52 An object and a screen are kept at a distance of 120 cm A lens is kept between them so that a real image is formed on the screen for two different positions of the lens Difference between the positions of the lens is 60 cm The focal length of the lens is 1 22 5 cm 3 20 cm 2 45 cm 4 20 5 cm

Numerical A stationary source is emitting sound at a fixed frequency fo which is reflected by two cars approaching the source The difference between t requencies of sound reflected from the cars is 1 2 of fo What is the difference in the speeds of the cars ho The cars are moving at constant speeds much smaller than the speed of sound which is 330 ms at km per hour to the nearest inte m

54 In a vessel two insoluble liquids are filled as shown in the figure The effective refractive index of the combination for normal view is 1 1 33 3 1 45 2 1 26 4 1 58 10 cm 10 cm 6 60 The cm lenc 1 3 61 An has leng obje 3

A particle of charge q and mass m moves rectilinearly under the action of an electric field E a Ba Here and are positive constants and x is the distance from the point where the particle was initially at rest Ther B O The motion of the particle is oscillatory O The amplitude of the particle is 23 O The amplitude of the particle is O None of these

forces of 3N 2N and 1N act on a particle as shown in the figure Calculate the net force along the x axis net force along the y axis and a single additional force required to keep the body in equilibrium A I NNF N 1 N 3 F 2 3 B 2N 3N IN X 3 B N 1 N F 2 NU 3 N

A circular ring carries a uniformly distributed positive charge The electric field E and potential V varies with distance r from the centre of the ring along its axis as O n n O n None of these

3 3 2 59 In a compound microscope the intermediate image formed is 4 1 Virtual erect and magnified 2 Real inverted and diminished 3 Virtual erect and diminished

43 A particle slides on the surface of sphere starting from the topmost point Find th angle rotated by the radius through the partic when it leaves contact with the sphere 1 cos 3 tan G 4 3 2 cos 4 tan 1 2 3 2 3

PLS PROVIDE SEPWISE SOLUTION Show clear diagram marking all the Forces 24 A simple pendulum is attached to a block which slides without friction down an inclined plane ABC having an angle of inclination a as shown A C B While the block is sliding down the pendulum oscillates in such a way that at its mean position the direction of the string is A at angle a to the perpendicular to the inclined plane AC B parallel to the inclined plane AC C vertically downwards D perpendicular to the inclined plane AC

A particle of mass 10 g moves along a circle of radius 6 4 cm with a constant tangential acceleration What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to 8 x 10 4 J by the end of the second revolution after the beginning of the NEET 2016 motion 1 0 2 m s 2 0 1 m s 3 0 15 m s 4 0 18 m s

ik 7 wt Assume E E where k 2 k cos ik sing k 1k and and 2 a Cartesian unit vectors Choose the correct statement a Electric field s magnitude is attenuated with the propagation of wave b The energy of the electromagnetic wave is flowing in the x direction c Electric field s magnitude is constant d Speed of wave is same as speed of light that is c

Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string The string passes over a pulley which is frictionless see figure The acceleration of the system in terms of acceleration due to gravity g is 1 g 2 to 4kg 2 g 5 6kg 3 g 10 4 None of these

Write the law of refraction of light beam in vector form using directing unit vectors e and e of the incident and refracted beams in medium of refractive indices 2 respectively and the unit vector of the outside normal to the interface of two mediums 441 14

An object is placed at a distance x from the focus of a concave mirror of focal length f Find the distance of image formed from the focus 1 2 2 3 fx 2 4 4 fx

36 Two particles of mass 1 kg each are moving in opposite direction with speed of 6 m s and 4 m s and undergoes collision with coefficient of restitution 1 Calculate loss in kinetic energy 2 75 4 3 75 2 4 300 8 3 4