Physics Questions

In the below figure shown H 0 25 10 kg 15 kg ongaper smooth Find the maximum value of F below which blocks move together 1 235 3 F 425 N 2 135 165 4 N

ctron mass A small concentration of minority carriers is injected into a homogeneous semiconductor held at 300K An electric field of 30 V cm is applied across a distance of 1 5 cm in a time of 300 us We width of the crystal As a result the minority carriers move s is the diffusion coefficient of the minority carriers in the semiconductor

A Plane mirror is placed on the other side of a convex lens having a focal length of 12 cm A distinct image is formed in front of the lens towards the object when the plane mirror is at a distance of 45 cm from the lens calculate the distance of image from the lens

One mole of a diatomic ideal gas is taken through a cyclic process starting from point A The process A B is an adiabatic compression B C is isobaric expansion C expansion and D A is isochoric respectively The volume ratios are given to be Vc 16 and 2 and the VB VA VB temperature at A is TA D an adiabatic 300 K Find the efficiency of the cyclic process in

Chapter 21 Electric Current and Direct Current Circuits 1 Given C 2 5 F C 4 5 F C 3 3 F and C 1 5 F what is the equivalent capacitance of the four capacitors between A and B Find the current I through the battery Note that the battery has an internal sistance of 0 4 ohms 30 V 0 492 A 44 5 00 WW AF 7 00 5 0 92 3 00

All surfaces shown in figure are frictionless pulley and strings are light Pulley P can move frictionlessly with a smooth light collar c Block A and B have mass m and 2m respectively Block B is pulled by a horizontal force F mg as shown in figure Then 2m P3 P o B A P2 C A Acceleration of block A is g 2 B Acceleration of block B is g 2 C Acceleration of pulley P is g towards left F mg

A particle of mass m is moving along a circle of radius r At some instant its speed is v and it is gaining speed at a uniform rate a then at the given instant acceleration of the mparticle is

14 A hollow cylinder and a solid cylinder having different mass diameter are released from rest simultaneously from the of an inclined plane Which will reach the bottom first a solid cylinder b cant be determined without knowing their masses c hollow cylinder d cant be determined without knowing their diameters

A magnet of length 14 cm and magnetic u is broken into two parts of length 6 cm and 8 cm They are put at right angle to each other with opposite poles together The magnetic dipole moment of the combination is Answer Rate this questic

For an inelastic collision the kinetic energy loss is the following 1 mm upp 1 e Happ 2 m m KE Lass where e coefficient of restitution v V u u a nd u app u approach U U

10V 43 Calculate the Norton resistance for the following circuit if 5 ohm is the load resistance 3 ohm O 10 ohm O 11 ohm 6 ohm 10 ohm www B ENGINEERING REMAINING TIME HOURS MINUTES SECONDS 1 56 ohm O 12 ohm O13 ohm

Which of the following is correct about a SHM along a straight line ONO No Ratio of acceleration to velocity is constant Ratio of acceleration to potential energy is constant Ratio of acceleration to displacement from the mean position is constant

A man pulls a loaded trolley of mass 70 kg along a horizontal surface at constant velocity as shown in Fig 2 39 The coefficient of kinetic friction between l k the tyres of the trolley and the road is 0 1 and the angle

Railway tracks are banked at the curves so that ONO the train may not fall down inwards the weight of the train may be reduced the necessary centripetal force to train may be obtained from the horizontal compoinent of the reaction force of railway tracks no frictional force may be produced between the wheel

In a horizontal spring mass system mass m is released after being displaced towards right by J some distance t 0 on a friction less surface The phase angle of motion in radian when it is first time passing through equilibrium position is equal to k m

partic A uniform magnetic field of magnitude 1 T exists in region y 0 is along k direction as shown A particle of charge 1 C is projected from point 3 1 towards origin with speed 1 m s If mass of Ay is 1 kg then co ordinates of centre of circle in which particle moves are pibs st 8 A 1 3 1 3 C 2 2 0 on abnowot ansig isin B 1 3 3 abusuot bata 3 D tax 0 s bi 2 2 2 a 3 1 B 1T hol A

3 Tom and Jerry are placed at a distance of 32 cm Between them a convex lens is placed having a focal length of 15 cm in such a way that images of both Tom and Jerry are formed at the same place What can be the possible distance of Tom from the lens

2 The angle of inclination of an inclined plane is 60 coefficient of friction between 10 kg body and its surface is 0 2 the acceleration of the body down the inclined plane in m s is g 10 m s 1 5 66 3 7 66 2 6 66 4 Zero

Three monochromatic 12 42nm 6 21nm each other in front of a converging lens such that equal powers from the three equal to 1mW each fall on a converging lens and then on a small spherical conductor of radius r 1mm and work function 62 1eV Assume 50 efficiency of emission and no change in effective value of work function due to photoelectric emission and potential rise Use hc 1242eV nm All electrons emitted by the sphere are immediately removed by some non electrical mechanism At t 8 sec switch S is closed so that the sphere gets connected to the earth via a resistor of value 6 750 Find the current flowing just after the switch is closed S S S3 sources having wavelengths and 24 84nm are placed close to Your Answer 2 5 R R Ground

The angles which the vector A 31 61 2k 5 makes with the cordinate axis 1 cos 1 2 cos 3 cos 1 4 None of these COS cos cos 4 7 005 TA 31 6j 2k ART 1 cos 1 2 cos 3 cos 1 4 Cos I COS COS I

Moment of inertia of a uniform hexagonal plate about an axis LL is T as shown in the figur a If the moment of inertia about axis XX of an equilateral uniform triangular plate of 13 imes density as hexagon is I a Find the value of a Ph L L Figure a PL X i Figure h 2 Kma Iday

26 In a uniform electric field if a charge is fired in a direction different from the line of electric field then the trajectory of the charge will be a 1 Straight line 2 Circle 3 Parabola 4 Ellipse

In the given figure if i 3 sin wt and i2 4 cos wt then i3 is i Question Type Single Correct Type 1 2 3 5 sin wt 53 5 sin wt 37 5 sin wt 45 H 3

41 Two charges of 25 x 10 9 coulomb and 25 10 coulomb are placed 6 m apart Find the electric field intensity ratio at points 4 m from the centre of the electric dipole i on axial line ii on equatorial line 1 3 1000 49 500 49 2 4 49 1000 49 500 it is a large d

14 A bullet of mass 50 g moving horizontally with a velocity of 400 m s strikes to a block of mass 20 kg placed on a smooth horizontal surface and rebounds back with same speed Then average force acting on the block if the time of interaction is 0 05 second is 2 1600 N 4 800 N 1 400 N 3 200 N 50 g af eft 400 m s fax fa in cu yffer la f 1 400 N 3 200 N 2 1600 4 800

A hollow conducting cylinder has an inner radius of a and an outer radius of b and carries a current I along the positive z direction Find H everywhere Use Ampere s circuital law Demonstrate clearly the correct usage of the Amperian paths

Find out the magnitude of resultant vector of 7 4N and 3N force 1 7 N 3 5 N W 4N 45 45 S 2 6 N 4 10 N 3N E 1 7 N 3 5 N W 4N 45 N S 2 4

Q3 The effective resistance for the below circuit is UT O 252 1 6 Q 2 422 2 802 5 6 Q 152 252 152 U

3 tan 4 tan A B If A 31 21 and B 21 31 k then find 3 unit vector along A B 1 3 i j k 3 i j k 3 2 j k 3 i j k 3 3 tan af A 31 21 am A B 1 3 i j k 3 i j k i j 3

A coil having area A is placed in a magnetic field which changes from Bo to 4B in t seconds as shown in the figure The induced emf will be 1 Coil Plane is parallel to Bo 3Ao Bo t 2 4 A Bot 3 Zero 4 None B 24 2 3

16 Two uniform discs A and B of equal masses and different radii rA and TB are mounted on fixed horizontal axles passing through their centres On each of the discs a light inextensible long cord is wound and the discs are held motionless If free ends of both the cords are pulled with equal forces for equal amounts of time lengths of the cord unwound from the discs A and B bear the relation relation a lA IB a L 1 b lA IB d More information needed

Example 2 Boron naturally occurs as a mixtu of boron 10 5 protons 5 neutrons an boron 11 5 protons 6 neutrons isotope The percentage abundance of B 10 is 20 an that of B 11 is 80 Then the atomic mass boron is calculated as follows

An ideal choke draws a current of 8 A when connected to an AC supply of 100 V 50 Hz A pure resistor draws a current of 10 A when connected to the same source The ideal choke and the resistor are connected in series and then connected to the AC source of 150 V 40 Hz The current in the circuit becomes 1 15 A 2 3 18 A 2 8 A 4 10 A

A horizontal force of 49 N is just able to move a block of wood weighing 10 kg on a rough horizontal surface Calculate the coefficient of friction g 9 8 m s 1 0 5 3 0 75 2 0 25 4 0

What is the angle between A and the resultant of 2 A B and A B 1 0 3 tan 1 B 2 tan 4 tan 1 B A B A B Efe A B f 1 0 3 tan

The coefficient of static friction between contact surfaces of two bodies is 1 The contact surfaces of one body support the other till the inclination is less than 1 30 3 60 2 45 4 90 X

Consider a wooden ring kept on a horizontal plane A bar magnet is held above the ring with its length along the axis of the ring If the magnet is dropped freely the acceleration of the falling magnet is g is acceleration due to gravity S N 1 More than g 2 Equal to g 3 Less than g i Magnet Ring

A body of mass 5kg is taken up an inclined plane of length 10m and height 5m and then released to slide down to the bottom If the coefficient of friction between the surface and the body is 0 1 the net work done against frictional force and gravitational force in the round trip are 1 25J 0 3 0 50 3J 2 50 50 3J 0 4 50 3J 50J

R www V If switch is closed 1 v increases 2 Both V and R www minimum R www V 2 suonon and v decreases V increases S 3 Both v and v decreases

5 Two identical uniform rod each of mass m and length joined perpendicular to each other An axis passes through junction and in the plane of rods Then M I of system about the axis is m m I K 90 m I my

If A B and C are vectors having a unit magnitude 4 If A B C 0 then A B B C C A will be 1 1 2 3 3 3 2 1 3 4 zero 2 ABC Son A B C 0 1 1 2 3 2

A coil has an inductance of joined in series with a resistance of 22092 When an alternating e m f of 220 V at 50 cps is applied to it then the wattless component of the rms current in the circuit is 1 5 ampere 2 0 5 ampere 3 0 7 ampere 4 7 ampere T H and is 35

NURTURE PHASE I TO MII INTERNAL TEST 06 23 09 2020 If the coefficient of friction is 3 the angle of

The equivalent resistance between A and B as shown in the given circuit is 692 wwwww 402 www 692 30 50 40 60 B

2 A vertical U tube of uniform cross section contains water in both the arms A 10 cm glycerine column R D 1 2 is added to one of the limbs The level difference between the two free surfaces in the two limbs will be A 4 cm B 2 cm

6 94 Particles of mass m and energy E move from the left to the potential barrier shown in Fig 6 3 Find a the reflection coefficient R of the barrier for E Uoi b the effective penetration depth of the particles into the region x 0 for E Uo i e the distance from the barrier boundary to the point at which the probability of finding a particle decreases e fold E UA H U

24 04 An object is at a depth H below The surface of le liquid of refractive index What is its apparent depth when the angle of vision at surface is 0 from vertical 3 I D a 3 8 1 pelos a sine 3 H 2 lose 7 C cos HE LONE

In a certain circuit current changes with time according to i 2 t r m s value of current between t 2 to t 4s will be 1 3A 2 3 3A 3 2 3 A 4 2 2 A

1 A Galileo telescope has an objective of foca length 100 cm magnifying power 50 The distance between the two lenses in norma adjustment will be A 150 cm C 98 cm B 100 cm D 200 cm

es en 20 Three charges 4q Q and q are placed in a straight 2 line of length at points 0 and distance away from one end respectively What should be Q in order to make the net force on q to be zero 1 q 2 4q 3 q 4 2q LIE J 1M mr d 2312