Physics Questions

12 A parallel plate capacitor with ci radius a is being charged as shown in the figure At the instant shown the displacement current in the to region between the plates enclosed between a is given by Id 000 2 1 i 3 8 8 4 100 TO 9 3 POIA

A thin rod of length 1 m is suspended from its end and is made to oscillate in a vertical plane The distance between point of suspension and centre of oscillation will be 1 m 3 2 m 3 1m 4 2 3 m

The distance between the point of suspension and the centre of gravity of a compound pendulum is and the rac of gyration about the horizontal axis through the centre of gravity is k then its time period will be 1 2 l k g l k lg l k g inimum period of oscillation will be 27 2 2 3 2T 4 2 2k eg

15 0 119 Acceleration a versus time t graph of a body in SHM is given by a curve shown below T is the time peirod Then corresponding graph between kinetic energy KE and time t is correctly represented by KE 1 h 3 KE V a XI KE 4 KE y alvin 4 1 a1

motion is S H M with amplitude a 2 4 The motion is S H M with amplitude 2a The resultant of two rectangular simple harmonic motions of the same frequency and unequal amplitudes but differ in phase by n 2 is 1 Simple harmonic 4 Parabolic 2 Circular 3 Elliptical

2 Coefficient of linear expansion of material of resistor is a Its temperature coefficient of resistivity and resistance are a and a respectively then correct relation is 1 r 3 3 2 4 Rap OL 3a

Attenuation of the x rays that penetrate through the body tissues which depends on I The tissue type II The intensity of the beam III The thickness of the tissue O I and III only O II and III only O I only O I II and III only

n an explosion a body breaks up into two pieces of unequal masses In this case O Both parts will have equal kinetic energies Lighter part will have more momentum Heavier part will have less momentum O Lighter part will have more kinetic energy

Two unequal soap bubbles are formed one on each side of a tube closed in the middle by a tap What happens when the tap is opened to put the two bubbles in communication 1 No air passes in any direction as the pressure are the same on two sides of the tap 2 Larger bubble shrinks and smaller bubble increases in size till they become equal in size 3 Smaller bubble gradually collapses and the bigger one increases in size 4 None of the above and a span bubble of radius r The pressure p

CP Simple Harmonic The potential energy of a particle with displacement X is U X The motion is simple harmonic when K is a positive constant KE 1m wy BE 2 U KX DU KX 2 A2 A2 to Im 3 U K 4 4 U KX onic motion will be equal when

The distance of point of a compound pendulum from its centre of gravity is the time period of oscillation relative to this point is T If g n the relation between and T will be 1 e x 0 2 1 1 x 0 K 0 3 uspension and centre of oscillation for a compound pendulum is 1 0 l k 0 4

A particle executes linear simple harmonic motion with an amplitude of 3 cm When the particle is at 2 cm from th mean positon the magnitude of its velocity is equal to that of its acceleration Then its time period in second is 5 1 2n 2 4T 5 2 t 3 3 5 T NEET 2017 2 3 They are connected in series and the new for

The force constant of a spring is k and that of another is 3k Now both spring are stretched through same distance if work done on springs are w and W2 respectively then O W1 W2 O W1 3W2 O W 3W W2 9W1

A disc of radius R is suspended from its circumference and made to oscillate Its time period will be R 2 3R 1 2T 2g In the above question its length equivalent to a simple pendulum will be 2 2 2 t 4R 2 R 3 2T 3 R 3R 2 4 2 4 2R 2R g

6 In the compound pendulum the minimum period of oscillation will be 20 1 2T k g 2 2 l g 2k 3 2 4 2T lum from its centre of gravity is f the time period of oscillation

1 Increases by 1 2 Increases by 0 5 3 Decreases by 0 5 In a simple pendulum the period of oscillation T is related to length of the pendulum as 1 constant 2 1 T constant 7 3 1 T constant 122 T constant

In a 18 cm long capillary tube water rises upto 16 3 cm height If tube is cut at a height of 12 cm then RPMT 20 1 Water will eject out as fountain from capillary tube 2 Water will remain at 12 cm in capillary tube 3 Height of water in capillary tube will be 10 3 cm 4 Level of water will fall down from capillary tube

4 viscosity A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V If T is the surface tension of the liquid then AIPMT 2014 1 Energy 4VT 1 3 Energy 3VT R is released is released 2 Energy 3VT is released 4 Energy is neither released nor absorbed of capillary tube above the surface of water is made less than

A soap bubble in vacuum has a radius of 3 cm and another soap bubble in vacuum has a radius of 4 cm If the bubbles coalesce under isothermal conditions then the radius of the new bubble is 1 2 3 cm 2 4 5 cm 3 5 cm 4 7 cm

1 A circle 2 An ellipse 3 A straight line 4 A parabola A S H M is represents by x 5 2 sin 2nt cos 2nt The amplitude of the S H M is 1 10 cm 2 20 cm 3 5 2 cm 4 50 cm

Two blocks of masses 3 kg and 6 kg are connected by an ideal relaxed spring and are placed on a frictionless horizontal surface The 3 kg block is imparted a speed of 2 m s towards left k 2 N m 2m s3kg mm 6kg List I P Q R The speed of 3 kg block is m s at time The speed of 6 kg block is time m s at The speed of 3 kg block is m s at time List II 1 2 3 TT sec 7 3 k 4 sec sec ho

A cylinder with a movable piston contains air under a pressure p and a soap bubble of radius r The pressure p to which the air should be compressed by slowly pushing the piston into the cylinder for the soap bubble to reduce its size by half will be The surface tension is o and the temperature T is maintained constant 1 SP 240 8p r 3 2p 240 240 2 4p 4 2p r 120

At critical temperature the surface tension of a liquid His zero 3 is same as that at any other temperature 2 is infinity 4 cannot be determined

Maximum acceleration of the train at which a box lying on its floor will remai stationary with respect to floor coefficient of friction between box and floor below the box is 0 25 is 2 9 ms 2 1 7 ms 2 O2 45 ms 2 16 mr 2

60 A man stands in the middle of a rotating table which has an angular velocity w He is holding two equal masses at arms length in each hand Without moving his arms he just drops two masses vertically on table The new angular velocity O will be greater than w O will be less than w Will not change min sec Will increase or decrease depends on initial angular momentum

The composition of two simple harmonic motions of equal periods at right angle to each other and with a pha difference of results in the displacement of the particle along 1 Straight line 2 Circle 3 Ellipse 4 Figure of eight Tun mutually perpendicular simple harmonic vibrations have same amplitude frequency and phase When t

A spherical soap bubble of radius 1 0 cm is formed inside another of radius 2 cm If a single soap bubble is fo which maintains the same pressure difference as inside the smaller and outside the larger bubble the radius c bubble is 1 0 005 m 2 0 05 m 3 0 0067 m 4 0 067 m

3 A capillary tube 1 is dipped in water Another identical tube 2 is dipped in a soap water solution Which of the following shows the relative nature of the liquid columns in the two tubes AIEEE 2008 1 3 B 4 hl 213 sgr asupfue hat water but of Tren

A second s pendulum is placed in a space laboratary orbiting around the earth at a height 3R where R is the radius the earth The time period of the pendulum is dist 1 zero 2 2 3 sec ar En 3 4 sec guillo ad inc 4 Infinite

A player caught a cricket ball of mass 200 g which was moving at velocity of 2 ms If catching process was completed in 0 1 s the force exerted by the ball on the hands of player is 20 N O 40 N O 30 N 80 N

A body of mass 5 kg at rest on smooth surface is acted upon simultaneously b two forces 3 N and 4 N at right angle to each other The kinetic energy of body the end of 6 s is 60 J 80 J 85 J 90 J

For a particle executing simple harmonic motion the kinetic energy K is given by K K cos cot The maximum val of potential energy is Pemax 1 K 2 Zero 4 Not obtainable

A particle starts S H M from the mean position Its amplitude is A and time period is T At the time when its speed is half of the maximum speed its displacement Y is 1 4 1 2 2 A 2 3 A 3 2 2A 4 3

A soap bubble of diameter 8 mm is formed in air The surface tension of liquid is 30 dyne cm The excess pressu inside the soap bubble is 1 150 dyne cm 2 300 dyne cm 3 3 x 10 3 dyne cm 4 12 dyne cm

17 Water is filled up to a height h in a beaker of radius R as shown in the figure The density of water is p tension of water is T and the atmospheric pressure is P Consider a vertical section ABCD of the water column through a diameter of the beaker The force on water on one side of this section by water on the other side of this section has magnitude 1 2P Rh nR pgh 2RT 3 PR R pgh 2RT 2R A B 2 2P Rh Rpgh 2RT 4 PR R pgh 2RT

A body of mass 1 kg is moving in a vertical circular path of radius 1 m The difference in kinetic energy at lowest and highest position is g 10 m s 10 J 20 J 25 J O 30 J

A thin wire is bent in the form of a ring of diameter 3 0 cm The ring is placed horizontally on the surface of som solution and then raised up slowly Upward force necessary to break the vertical film formed between the ring and t solution is 1 6 T dyne 2 2nT dyne 3 4T dyne 4 3T dyne

The maximum speed with which a car is driven round a curve of radius 12 5 without skidding with coefficient of friction between tyres and roadway 0 2 is 12 km hr 1 16 km hr 1 18 km hr 1 36 km hr 1

A cyclist is riding at speed of 10 m s takes a turn on a horizontal circular road radius 103 m without skidding What is his angle of inclination to the vertical 15 30 45 60

A spherical liquid drop of radius R is divided into 8 equal droplets If the surface tension is T then work done in th process will be 1 2TR T 2 3 R T 3 4 R T 4 2 RT ubblo in vacuum has a radius of 4 cm If the t

Two parallel glass plates are dipped partly in the liquid of density d keeping them vertical If the distance betwe the plates is x Surface tension for liquid is T angle of contact is 0 then rise of liquid between the plates du capillary will be 1 Tcose xd 2T cos 0 xdg 3 2T x dgcose 4 Tcose xdg

A particle is vibrating in a simple harmonic motion with an amplitude of 4 cm At what displacement from the equilibrium position is its energy half potential and half kinetic 1 1 cm 2 2 cm 3 3 cm 4 2 2 cm Y K Y cos ot The maximum val

A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making a angle with vertical edge of the disc If the disc displaces a weight of water W and surface tension of water is T the the weight of metal disc is 1 2 rT W 2 2 rT cose W 3 2x rT cose W 4 W 2n rT cose

A block of mass 2 kg is kept on the floor The coefficient of static friction between block and floor is 0 2 If a force of 3 N is applied on block as shown in diagram the frictional force between block and floor is F 3N 2 kg 02N 03 N O4N O Zero

A body of mass m strikes a stationary body of mass M and undergoes an elasti collision After collision m has speed one third of its initial speed The ratio m Mis 3 1 02 1 3 2 O 5 3

A capillary tube of radius R is immeresed in water and water rises in it to a height H Mass of water in capillary tube is M if the radius of the tube is doubled mass of water that will rise in capillary tube will be 1 2M 2 M 3 M 4 4M 2 bubble of radius r r The radius R of the soapy film

Which of the following statement is wrong Torque in rotational motion is analogue to force in linear motion Couple acting on an object can produce linear acceleration For an extended body centre of mass and centre of gravity may not coincide Rolling motion is combination of linear and translation motion

A wheel initially at rest is rotated with uniform angular acceleration The wheel rotates through angle 0 in first 10 seconds and through additional angle of 02 in next 10 seconds The ratio 33 is 04 1 3 1 4 3

Two skates A and B of weights 40 kg wt and 60 kg wt respectively are facin each other 5 m apart Then they pull a light rope stretched between them Assuming surface to be smooth They will meet at a distance of O 3 m from A 2 m from A 2 5 m from A O 3 5 m from A

A particle of mass M is situated at centre of a spherical shell of same mass wit adius R The change in gravitational potential when mass is taken to surface of the shell is O O GM 2R GM 2R 3 GM 2 R Zero