Physics Questions

In the circuit shown in figure neglecting source resistance the voltmeter and ammeter reading will respectively be V X 10 22 ooowooo 1 OV 3A 2 150V 3A 3 150V 6A wwww X 10 2 400 320V A

For a series LCR circuit for two different angular 002 frequency of A C supply system w and 2 power factor of the circuit is same Angular resonance frequency of the circuit is o 12 SI unit If w 25 SI unit then find the value of in rad s 1 7 2 5 3 4 4 3

Two wires of same length are shaped into a square and a circle If they carry equal current and placed in uniform magnetic field with their plane perpendicular to magnetic field then ratio of torque acting on them is 4 2 4

10 A body kept on a smooth inclined plane of inclination 1 in x will remain stationary relative to the inclined plane if the plane is given a horizontal acceleration equal to B D A x 1g gx C 1 x 1 X X g

OPTICS PHYSICS X APT 2021 22 13 Athin prism has different medium on its either side A light ray is incident almost normally on the first face What is the angle of deviation if all the angles are very small 0 1 1 A 1 4 0 1 1 1 A 1 1 c 1 A 1 A 12 sixe jed

Two parallel and opposite forces each 4000 N are applied tangentially to the upper and lower faces of a cubical metal block 25 cm on a side Find the angle of shear and the displacement of the upper surface relative to the lower surface The shear modulus for the metal is 80 GPa 90 a 0 2 x 10 6 cm c 2 65 x 10 5 cm b 2 0 x 105 cm 2014021 d 2 15 x 105 cm

daughter nuclei respectively in a radioactive decay The Q value of decay is Q and that for decay is Q If me is mass of an electron then which of the following is correct Q Mx My c Q Mx My c M M 2m l

The moment of inertia for a uniform rectangular slab about an axis passing through its geometric centre and perpendicular to its plane is length b breadth M 12 1 b 6 M 1 2 5 4 25 0 MP 223 Mb

A ball dropped from a tower strikes the ground in 6s Find the velocity strikes the ground What is the distance travelled by the ball in the last 3s g 9 8 m s with which the ball 58 8 m s 132 3 m in the last second of

The electric field near the earth s surface is 44 N C downward An object of charge 10 2 C floats at rest near the earth s surface as shown in the figure Find the mass of the object in g Use g 10 m s Eearth Eearth m mg

A certain charge Q is to be divided in the ratio p q between two bodies which are located at a certain fixed distance from each other For the force of repulsion between them to be maximum the ratio p q should be A 1 1 B 1 2 C 1 4 D 1 6

5 Given below are two statements labelled as Assertion A and Reason R Assertion A A capacitor can be given only a limited amount of charge Reason R After a limited value of charge the dielectric strength of dielect between the capacitor plates break down Select the most appropriate answer from the options given below a Both A and R are true and R is the correct explanation of A b Both A and R are true but R is not the correct explanation of A c A is true but R is false d A is false and R is also false

A very long line of charge density 7 nC m is placed parallel to a very large sheet of charge denstiy a 4 nC m as shown in the figure Find the magnitude of the net electric field at the indicated point P between the line and the sheet KA 10 cm long line O O O large sheet 0 6 23 10 N C 6 83 103 N C 4 43 10 N C 5 03 103 N C 5 63 x 103 N C

2a sin is silvered on one side as shown in figure x and y are in 37 a cm If a ray incident on surface parallel to x axis and reflected along y axis then the co ordinates of point of incidence are A curved surface given by y 1 2 2 4 TCX Silvered Surface 3a 4 a 3a

5 A rope 3 cm diameter has a breaking strength 1 5 105 N The breaking strength of a similar ro 1 5 cm is diameter is 1 2 10 5 N 3 35 105 N 2 0 375 x 10 5 N 4 6 105 N

please make me understand I am not getting understand Please explain in detail so that I can understand better

A cricket player catches a ball of mass 100 gm moving with velocity of 10 m s If the ball is caught and stopped in 0 02 second the average force exerted by ball on the hand of player is nearly O 51 N 80 N O 25 N 40 N

P Given below are two statements labelled as Assertion A and Reason R Assertion A Current density is defined as current per unit area and is directed along the direction of current Reason R The current density is a scalar quantity Select the most appropriate answer from the options given below a Both A and R are true and R is the correct explanation of A b Both A and R are true but R is not the correct explanation of A c A is true but R is false d A is false and R is also false

A particle is travelling on a curved path In a certain time interval it speed changes from v to however magnitude of change in velocity is 3v then 1 Final velocity is perpendicular to initial velocity 2 Final velocity vector makes an angle of 120 with initial velocity vector 3 Final velocity vector makes an angle of 60 with initial velocity vector 4 None of these

In the figure shown there is a equi convex lens of radii of curvatures 20cm The observers A B are at rest Slab lens are moving rightward as shown then At rest O 5cm air 3cm 10cm s u 1 5 8cm A air 5cm s 1 5 B air 1 Velocity of object O as observed by observer A is 10 cm s is towards right 2 Velocity of object O as observed by observer B is 75 cm s is towards right 3 Velocity of object O as observed by observer B is 75 cm s is towards left 4 Velocity of object O as observed by observer B is 85 cm s is towards right

3 15 mm 25 Breaking stress of a wire of radius r is So If radius becomes double then breaking stress of same wire becomes 1 So 3 450 w 2 2So 4 2

lock B of mass m is suspended from a cord of length attached to a cart A of mass M as shown in the figure The horizontal surface on which the cart moves is smooth Initially both the cart and the block are at rest in the position shown Now B is released Take M m 2 kg 0 45 and g 10 m s Answer the following questions 18 19 The acceleration of the cart immediately after the system is released from rest is 1 A 2 m s C m s 10 3 2 C B 5 3 2 10 The tension in the cord immediately after the system is released from rest is A 10 N 10 B 3 m s D 5 m s D N 20 2 3 N

corners of a square of side and a charge qo is ke at its centre so that whole system is in equilibriur The charge q is 1 90 11 2 2 2 9 1 2 2 2 do 11 2 21 4 011 251

34 A point charge Q is fixed above a large conducting sheet Select correct statement regarding electric field 1 Electric field is uniform in space upper and lower side of sheet Q 2 Direction of electric field lines on upper and lower fance of sheet are in opposite direction 2 Flo One Year Medical 2016 2017

Which of the following statements is wrong for an image formation of a real object NCERT Pg 315 1 The magnification produced by convex mirror is always less than one 2 A virtual inverted same size image can be obtained using plane mirror 3 A virtual erect magnified image can be formed using a concave mirror 4 A real inverted same sized image can

even be used analytically such as in a mass spectrometer Q 5 If an electron describes half a revolution in a circle of radius r in the magnetic field B then energy acquired by it is 1 Point 00 mv 2 2 mv 2 4 pir X Bev

An electric dipole of moment p is kept at the origin pointing along the z axis Given that z is much greater than the length of the dipole the potential difference between the point 0 0 z along its axis and a point on the equatorial plane x y plane is A B C P 2 4 Z D P 4 Z P 2 2 Z P

g 9 8m s 122 5 m A body is released from rest from a height of 490 m Find the time taken by the body to reach the ground How much distance does it cover in the 4th second of its motion p 9 8 m s 10 s 34 3 m

estion 2 Two point charges are located on the x axis The first is a charge q11 00 nC at x 0 500 m At what distance x in cm a second charge q2 1 8 nC should be placed so the net electric field at the origin is E 43 0 i N C 91 92 0 5m x X

When an AC voltage of 220 V is applied to the capacitor C a the current is in phase with the applied voltage b the charge on the plates is in phase with the applied voltage c the maximum voltage between plates is 220 V d power delivered to the capacitor is infinite

A particle is projected from origin in x y plane x in horizontal direction y in vertical direction If there exists a field that exert a force on the particle equal to weight of particle in vertically upward direction then particle passes through point 3 4 after 0 2 sec If this particle moves only under gravity of earth then the equation of path followed by particle will be x x 45 4 1 y x 3 80 4 2 y x 3 x 4 80 3 3 y x 3 4 y x 4 x 45

A load of 2 kg produces an extension of 1 mm im a wire of 3 m in length and 1 mm in diameter The Young s modulus of wire will be 1 3 25 1010 Nm 2 2 7 48 x 1012 Nm 3 7 48 x 1010 Nm 4 7 48 x 10 10 Nm 2

A particle of mass m moves in circular orbits with potential energy V r Fr where F is a positiv constant and r is its distance from the origin Its energies are calculated using the Bohr model If the radius of the particle s orbit is denoted by R and its speed and energy are denoted by v and E respectively then for the nth orbit here h is the Planck s constant A R x n 3 and vx n 3 1 3 C E 4x m B R x n 3 and v x n 3 1 3 D E 2

A is false and R is also false 7 Assertion A The voltage sensitivity may not necessarily increase on increasing the current sensitivity Reason R Current sensitivity increases on increasing the number of turns of the coil 1 Point 0 0 Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false and R is also false

An isolated conducting sphere of radius R has a positive charge Q Another uncharged conducting sphere of radius R 2 is brought in contact with the first one and then the two spheres are separated The charge that remains on the first sphere is A Q 3 B 2 Q 3 C 3 Q 4 D 4 Q 3

The x z plane is the boundary between two transparent medium Medium I with y 0 has refractive index and medium Il with y 0 has refractive index 1 A ray of light in medium l given by e 1 31 is incident on the plane surface of separation If the reflected and refracted rays are perpendicular to each other find the value of 1 3 2 2 3 2 3 33 4 2 srl blen

37 When inner and outer concentric spheres as shown in figure have 20 C and 15 C charges potential difference between them is 40 V If charge on outer sphere is doubled potential difference between two spheres becomes n times the initial value The value of n is 1 2 3 1 b a 2 2 4 1 2

The path of a projectile is defined by the equation r 3t t 30 and 0 1600 t Find its velocity and acceleration after 30 sec r 3t t 30 0 1600 430 PR

A thin uniform rod AB of mass m and length L is placed on a smooth horizontal table Rod is hinged at centre of mass as shown A constant horizontal Force of magnitude F starts acting on the rod at one of the ends B Initially the force is perpendicular to the length of rod Acceleration of the point on L the rod located at distance from end A just after F starts acting is nF m Find the value of n

The circuit as given in figure contains two diodes each with a forward resistance of 30 0 and with infinite backward resistance if the battery is 3 V the current through the 50 Q resistance in ampere is D D 3 V Zero 0001 0 02 7002 m 700 www 500

8 A parallel plate capacitor is charged to a potential difference V by a DC source and the If the distance between the plates is doubled Capacitance will change t of initial capacitance disconnected a Half b Double c remain same d four times

1 A slender prismatic bar AB is supported in a horizontal position as shown in Fig A At what distance x from the hinge A should the vertical string DE be attached to the bar in order that when it is cut there will be no immediate change in the reaction at A Ans x 21 3 K AK C w FIG A E D 7 2 B

A particle of mass m moving with velocity v strikes elastically with a mass m at rest then the condition for maximum transfer of kinetic energy is Om m O O m m m m C

3 Acceleration of 1 w r t rope is 5g upwards Find acceleration of 2 w r t rope so that block remains at rest 113 2 m

6 In the following four situations charged particles are at equal distance from the origin Arrange them the magnitude of the net electric field at origin in increasing order i iii 5q 2q 3q de de OX 4q 29 1 i iii ii iv 2 ii i iii iv 3 i ii iv iii 4 iv ii iii i OX ii iv 3q 2q 3q OX 9 OX q New Lig

20 The poten energy function for the force between two atoms in a diatomic molecule is approximately given by a where a and bare b 6 constants and x is the distance between the atoms If the dissociation energy of the molecule is D U x Uat equilibrium 1 D is 6 b U x m 020x12 a c 2a 6 4a d 6 12a 6 6a vid

When frequency of applied alternating voltage is very high then a A capacitor will tend to become SHORT b An inductor will tend to become SHORT c Both A and B d No one will become short

In a metre bridge what is the effect on null deflection of galvanometer when the radius of the meter bridge wire is doubled a There will be no change b Null point will shift to right c Null point will shift to left d Null point will not be available

32 Three identical ideal electric dipoles are arranged as shown in the figure The electric field strength at point R is equal to symbols have their usual meaning 1 41 o P 5p 2 R 2 3 P 1 3p 3 4 o

A ball of mass m is thrown at an angle is with the horizontal with an initial velocity The change in its momentum during its time of flight T is A mgT B 2musin 0 C mu sin D Mg