Physics Questions

4 103 A wedge of mass m and triangular cross section AB BC CA 2R is moving with a constant velocity vi towards sphere of radius R fixed on smooth horizontal table as shown in figure 4 156 The wedge makes an elastic collision with the fixed sphere and returns along the same path without any rotation Neglect all friction and suppose that the wedge remains in contact with the spare for a very short time A during which the sphere exerts a constant force F on the wedge a Find the force F and also normal force N exerted by the table on the wedge during the time At 2my b Let h denote the perpendicular distance between the centre of mass of the wedge and the line of action of F Find the magnitude of the torque due to the normal force N about the centre of the wedge during the interval At 1 A B Figure 4 156 LY 2mv 4mvh

The spectral line for a given element in light received from distant star is shifted towards longer wavelength side by 0 025 What is speed of star in line of sight O 2 5 x 104 ms 1 O 6 2 x 104 m s 1 O 7 5 x 104 m s 1 O 3 6 105 m s 1

A charged particle enters in a magnetic field in a direction perpendicular to the magnetic field Which of the following graphs show the correct variation of kinetic energy of the particle with time t

Two identical thin rotating rings move along a smooth horizontal plane towards each other Their velocities v and v are directed along a straight line connecting the centers of the rings Angular velocities of the rings o and o Determine the angular velocity of the rings after th ollision if the slipping relative to each other disappears at the last moment a blow A 30 0 4 B 0 110000 30 01 00 30 0 4 D 302 01

8 Two aeroplanes A and B are moving away from one another with a speed of 720 kmph 45 The frequency of the whistle emitted by A is 1100 Hz The apparent frequency of the whistle as heard by the passenger of the aeroplane B is velocity of sound in air is 350 ms 1 300Hz 2 400Hz 3 500Hz 4 600H 1 A to ec ai 1

Discharging of a capacitor across three different resistance is given in figure then Qo 3 Question Type Multiple Correct Type 2 2 1 All three has equal heat loss 4 average life of discharging is maximum for 1 3 Third has least resistance initial rate of heat loss is

7 A 2 000 kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails with magnitude of 6 000 N directed toward the northwest 45 N of W What is the direction of the resultant acceleration a 60 N of E b 30 N of W c 30 N of E d 74 N of W

A uniform cylindrical rod of mass m and length 17 L is rotating with an angular velocity oo The axis of rotation is perpendicular to its axis of symmetry and passes through one of its edge faces If the room temperature increases by t C and the coefficient of linear expansion is a the change in its angular velocity is 1 2mat 2 coat 3 3 mat 4 wat 2 95 am 1 2coat 3 3 out a fa a for you 2 coat 4 a wat 2

39 An engine is moving on a circular path of radius 100 metre with a speed of 20 metre per second The frequency observed by an observer standing stationary at the centre of circular path when the engine blows a whistle of frequency 500 Hz is 1 more than 500 Hz 3 500 Hz 2 less than 500 Hz 4 no sound is heard 7 1 13 3 19 4 25 2 31 1 37 4 43 2

A small objects slides height 50 cm shown in figure 3 126 and then loops the vertical loop of radius 20 cm from which a symmetrical section of angle 2a has been removed Find the angle a such that after losing constant at A and flying through the air the object will reach at point B Ans 60 1 H B Figure 3 126 A R

The motion of a body falling from rest in a medium dv dt is given by equation any time t is 1 1 e 3 1 e 1 2v The velocity at da 2 1 e t 4 1 8 2 bruo

A capacitor of 2uF draws a current of 4 mA 28 when connected across an a c of 300 Hz The voltage drop across capacitor is 1 1 06 V 2 1 5 V 3 2 1 V 4 6 6 V 2uF enten den 4 mA ferit ut farvater 1 1 06 V 3 2 1 V 300 Hz ac Enfaat dan 2 1 5 V 4 6 6 V

4 6 6 V A student connects a long air cored coil of 29 manganin wire to a 100 V D C supply and records a current of 25 amp When the same coil is connected across 100 V 50 Hz a c the current reduces to 20 A the reactance of the coil is 1 30 2 40 3 5 0 4 None of these 3 2 1 V 4 6 6 V va faerit at ang ate geeft fea a 100 V D C 25 A 100 V 50 Hz Andit atque auferat 1 30 3 5 02 2 40 4

A triangle ABC is given where vertex A is 1 1 and the orthocenter is 2 4 Also sides AB and BC are members of the family of lines ax by c 0 where a b c are in AP 53 54 The vertex B is A 2 1 The vertex C is A 4 16 B 1 2 B 17 4 C 1 2 C 4 17 D none of these D 17 4

3 14 4 19 Number of electrons in one coulomb of charge 18 will be 1 5 46 1029 3 1 6 10 9 2 6 25 10 4 9 x 10 3 14 1 5 46 10 3 1 6 10 4 19 2 6 25 10 4 9 10

A ladder with a mass of m kg uniform mass and a length L is leaning against the corner of the top of a wall The contact point between the corner of the wall and the ladder is at 0 750L from the bottom of the ladder The angle between the ladder and the ground is 0 A painter of mass M kg is standing on a ladder rung L 3 from the bottom of the ladder and sees a paint can of mass m1 kg hanging from the very top of the ladder What is the magnitude of the force from the wall on the ladder if this force is straight up

A battery of e m f E and internal resistance ris connected to a variable resistor R as shown in figure Which of the following is true E R wwwwwwww www

D The angles of inclination of the suspended 20 o a fer 306 at 0 0 charged pendulum are 30 60 due to electric field of the infinite sheets of surface charge densities and a respectively then a a AN AN 60 2 3 2 3 4 1 3 4 1 3 1 3 3 1 3 T 1 3 3 1 3

he 44 of he y a source of sound is travelling towards stationary observer The freqency of sound heard by the observer is 25 more than that of the actual freqency if speed of sound is V that of the source is 1 V 5 2 V 4 3 V 3 4 V 2

1 A 10 kg block is pulled in the vertical plane along a frictionless surface in the form of an arc of a circle of radius 10 m The applied force is of 200 N as shown in figure If the block had started from rest at A the velocity at B would be 1 1 7 m s 3 27 m s A 2 15 7 m s 4 34 m s

Question 13 V g k on block B is A Block A is in equilibrium Now block A given velocity m in downward direction Maximum normal reaction B 3 mg 4 mg M M 3 00 3mg m A lllllll 88 min 33 sec 2m B N M 1 00 My Answer Correct Answer

Two particles A and B are projected in same vertical plane as shown in diagram If B particle hits A then A A B C D 53 60m s 100m UB 45 m s UB 80 m s UB 37 Correct Answer Velocity of B when it hits A is 74 4m s B Velocity of A when it hits B is

If R in Figure 5 25 is open the base voltage is a 10 V b 0 V c 3 13 V d 0 7 V If R is open the collector current in Figure 5 25 is a 5 17 mA b 10 mA c 4 83 mA R 10 k R 4 7 k Vcc 10 V Re 1 0 k a Faulty circuit 470 0 FIGURE 5 25 10 0v d 0 mA

What should be the ratio between the leng radius of the uniform solid cylinder so t moment of inertia about central axis is the as that about equatorial axis 2 3 1 3 3 2

44 The total flux associated with the given cube will be where a is side of the cube 5 ST 4 9 10 SI units A 162 x 10 3 Nm C 3 162 x 10 Nm C 162 x 10 6 Nm C 162 x 106 Nm C 4 C 2 C 6 C 8 C a a 1 C 3 C a 7 C 5

What is angular spread between central maxima and first ordered maxima of diffraction pattern due to single slit of width 0 25 mm w light of wavelength 600 nm is incident on it normally O 3 6 x 10 3 rad 4 2 x 10 3 rad 1 2 x 10 3 rad 2 4 x 10 3 rad

A parallel plate capacitor is charged with a battery of emf V volts After charging the battery is disconnected and the distance between the plates is increased to 1 5 times the initial value The new potential across the plates of the capacitor will become

Phy S This section contains 35 SINGLE CORRECT TYPE questions Each question has 4 choices 1 2 3 and A current is flowing through the loop as shown in figure below The magnetic field at centre O is O O O O R O 7 01 15R 16R 5 16R 7 17 15R 90 2R downward downward downward upward

2 ALLEN A cylindrical metallic rod in thermal contact with 42 two reservoirs of heat at its two ends conducts an amount of heat Q in time t The metallic rod is melted and the material is formed into a rod of half the radius of the original rod What is the amount of heat conducted by the new rod when placed in thermal contact with same two reservoirs in time t 1 999 2 3 26 27 2 16 and action for at and GET aft forf fen ve soffren a fontari 3 1

15 A uniform rope of length L and mass m hangs vertically from a rigid support A block of mass m is attached to the free end of the rope A transverse pulse of wavelength 2 is produced at the lower end of the rope The wavelength of the pulse when it reaches the top of the rope is 2 The ratio is m m a b m c m Vm m Vm d m m m NEET I 2016 16 4 0 g of a gas occupies 22 4 litres at NTP The specific heat capacity of the gas at constant volume is 5 0 J K mol If the speed of sound in this gas at NTP is 952 m s then the heat capacity at constant pressure is Take gas constant R 8 3 J K mol a 7 0 J K mol b 8 5 J K mol d 7 5 J K mol c 8 0 J K mol 2015

A cylindrical conductor carries a constant current I out of the screen The line integral of the magnetic flux density vector B along a closed circular counter clockwise contour C not shown centered outside the conduc is 88880 10 conductor HOI ol greater than I positive and less than I zero

In a region of uniform field as an electron travels from A to B it slows from UA 6 1 x 106 m s to up 4 5 106 m s What is its potential change AV VB VA in volts A 18 B 18 C 48 Correct Answer

4 All reach the ground with same velocity 4 M A solid cylinder of mass M and radius R rolls 22 down an inclined plane without slipping The speed of its centre of mass when it reaches the bottom is h is the height of inlined plane 1 2gh V3gh 2 3 Vash 4 4g h deh 2gh 1 2 V3gh 48h a fel de 4g h ne questionper d

19 A string of length 0 4 m and mass 102 kg is tightly clamped at its ends The tension in the string is 1 6N Identical wave pulses are produced at one end at equal intervals of time At The value of At which allows constructive interference between successive pulses is a 0 05 s b 0 10 s c 0 20 s d 0 40 s

Find the magnitude of induced emf in the loop if magnetic field is changing as B Bot O B R O B 2 R O BR O Zero

The total kinetic energy of a body of mass 10kg 15 and radius 0 5m rolling with a velocity of 2 m s without slipping is 32 8 J The radius of gyration of the body is Telegram neetquestionpaper 1 0 25 m 2 0 2 m 3 0 5 m 4 0 4 m 10kg fan fhuc at an af gut from groft 30 5m 2 m s 332 8 1 0 25 m 3 0 5 m 2 0 2 m 4 0 4 m

6 58 Two satellites move in circular orbits around the earth at distances 9000 km and 9010 km from earth s centre If the satellite which is moving faster has a period of revolution 90 minutes Find the difference in their revolution periods Ans 9 s

tional equil only 8 A 1200 kg car moves in horizontal circular track of radius 20 m The separation between the two back tyres is 1 7 m The center of mass of car is 0 5 m Find the coefficient of friction between road and tyre so that car slips before toppling A 1 7 B 1 7 C 3 4 D 3 4

Which of the following is a property of equipotential surfaces 0 77 Mark O The direction of electrostatic field will be perpendicular to the equipotential surface The potential difference between any two points on an equipotential surface is zero For a point charge the equipotential surfaces will be concentric spheres All the statements above are correct

45 Smooth B 10 5 10 57 45 rough The ratio of acceleration of blocks A placed on smooth incline with block B placed on rough incline is 2 efficient of kinetic friction between block B and incline is 2 0 75 4 None of these

162 A 8 kg block A is placed on 2 kg block B which rests on a table Coefficient of friction between A and B is 0 5 and between B and table is 0 2 A 60 N horizontal force is applied on the block A then the friction force between the blocks A and B is 1 Zero 3 28 N 2 2 5 N 4 40 N

The Sun has a surface temperature of 5778 K and a radius a 6 96x108 m The Sun is at an average distance of 1 5x10 1 m from the Earth If the Sun s temperature were to increase by 224 K calculate the Solar Insolation at the Earth in W m 2

al nt t SS m bob is 6 22 A simple pendulum is a device in suspended from a support by means of a string figure 6 108 If the string is pulled aside by a small angle from the vertical and released the bob executes simple harmonic motion For two pendula whose bob have the same gravitational mass at one of which has an inertial mass 1 larger than the other show that the one with the larger inertial mass has a time period approximately 0 5 greater than the other one 0 tagitany m

on the pulley in the upward di A block of mass m placed on a smooth floor is connected to a fixed support with the help of a spring of force constant k It is pulled by a rope as shown in the figure Tension T of the rope is increased gradually without changing its direction until the block losses contact the floor The increase in rope tension T is so gradual that acceleration in the block can be neglected 7 0 a Draw its free body diagram well before the block losses contact with the floor b What is the necessary tension in the rope so that the block looses contact with the floor c What is the extension in the spring when the block looses contact with the floor

The dispersive powers of glasses of lenses used in an achromatic converging pair are in the ratio of 5 3 If focal length of concave len 15 cm then nature and focal length of other lens will be O Convex 9 cm O Concave 3 cm O Concave 12 cm O Concave 9 cm

2 84 A heavy particle of mass 1 kg is suspended from a massless string attached to a roof A horizontal force Fis applied to the particle such that in the equilibrium position the string makes an angle 30 with the vertical The magnitude of the force F equals A 10N C 5 N B 10 3 N D 10 3 N 30 Figure 2 180

1 Total energy density of electromagnetic waves in vacuum is given by the relation 1 E B 2E0 2po 2 EE MOB 3 E B C 2 4 EE B 2 0 R TEST SERIES JOINT PACKAGE COURSE UG 2021 11102020 Araia faya grad vere ata Telegram ne estio 1 3 B 280 2 0 2 50E E B C HoB2 4 EE B 2 0 Space for Rough Work ferg Grie 0999DMD310320008 LTS Page 13 48

IV The acceleration of a particle moving along a straight line at any time t is given by a 4 2v where v is the speed of particle at any time t The maximum velocity is 1 4 m s 3 6 m s 2 2 m s 4 Infinity

1 A body of mass 3 kg travelling along a straight horizontal path covers a distance of 5 m in its 5th second of motion If it starts from rest the momentum of the body 3 s after its start of motion is 10 10 20 2 kgms kgms 3 3 10 kgms 4 kgms 3 2 The displacement of a particle having 1 kg mass in two successive 2 second intervals are 10 m and 4 m respectively If it starts with initial velocity 20 m s the momentum of the particle after 76 m displacement is 1 9 kgms 2 18 kgms 3 27 kgms 3 Two objects are connected by a string that passes over a frictionless pulley as shown in the figure where m ma and as and as are the magnitudes of the respective accelerations Which mathematical statement is true regarding the magnitude of the acceleration as of the mass m 1 a g 3 a2 g 4 The momentum of a body moving on a straight path vaires with time according to the graph shown in the figure The average force acting on the particle between t 0 tot 6 sis 1 0 75 N 2 1 67 N 3 0 33 N 4 zero 5 An object of mass m is acted upon by two antiparallel forces F and F F F If the change in velocity of the of the object is AV in time AT the force F in terms of F is AV AV 1 F F M3 2 F F M At 3 F F At 1 At MAV 4 F F MAV At Momentum kgm s 4 36kgms 4 a a 4 4 Time s 6 When a man climbs up the stairs without holding the railings the action and reaction force pair are 1 normal reaction by the step on him his weight 2 his weight normal reaction by the step on him 3 his force pushing the step horizontally forward force by the step horizontally backwards 4 force of his foot vertically downwards force by the feet vertically upwards Marked Incorrect ov Next

ds ta nd in 20 In the figure the intensity of waves arriving at D from two coherent sources s and s2 is Io The wavelength of the wave is 4 m Resultant intensity at D will be a 4 S10 3m S2 h lo 4m 21 D