Physics Questions

0 A particle of mass m moving along a straight line experiences force F which varies with the distance travelled as shown in the figure If the velocity of the 2F then its velocity at 4x is particle at x is 3 2F 2F 0 F AX 2 2 Foxo 4 none of these

A right angled glass prism u 3 is kept on a horizontal surface in contact with a vertical plane mirror as shown A ray of light travelling horizontally retraces its path when transparent liquid of refractive index u is filled in the space between prism and mirror Refractive index u of the liquid is 6 1 2 5 6 45 45 2 5 3 4 F

Two man a and b starts from a common point on a circular track of radius 5m in opposite direction with speed 1m s and 2m s respectively If they move for a very long time At how distinct point will they meet

QUESTION NO 22 Aditya started driving his car He increases the speed till 4 seconds and then he kept his card in constant speed for 6 seconds Then after he decreased the speed of the car up to another 6 seconds After reaching at the starting place he draws the speed time graph of his 16 seconds driving as shown below B KON D 4 10 Time s Speed m s A 6543210 C 16

A wall is moving with velocity u and a source of sound moves with velocity in the same direction as shown in the figure Assuming that the sound travels with ve 2 10u If the ratio of incident sound wavelength on the wall to the reflected sound wavelength by the wall is a b Find a b u

If min is minimum wavelength produced in X ray tube and is the wavelength of K line As the operating voltage is increased A B C Ky increases 7 K decreases K min increases

E 3 3 3 In a double slit experiment n fringes are observed to be formed on a screen placed at a distance D from the slits when light of wavelength is used Now the screen starts moving from rest with constant acceleration a Then the time after which the first maxima disappears from screen and the direction of motion of screen are respectively 2D n 1 1 2 3 tionpaper 2D n 1 2D n 1 2D n 1 a away from slits towards slits away from slits towards slits

A block of mass slides on a rough inclined plane with constant velocity V and reaches the horizontal surface The work done by all the forces on the block is A mgh mg cos 0 h C zero mg sin 0 cos 8 h B D 0

A conveyor belt is used to move luggage in an airport from the ground into the hold of a plane The belt lifts a pile of suitcases with a combined mass of 120 kg 15 m up a 14 slope The luggage starts from rest at the bottom of the slope and accelerates uniformly until it reaches the top with a velocity of 2 2 m s a Calculate i The total work done by the conveyor belt in moving the luggage Ignore any friction in the movement of the conveyor belt

Example 6 5 A block of mass m is placed on the inclined surface of a wedge as shown in Fig 6 249 Calculate the acceleration of the wedge and the block when the block is released Assume all surfaces are frictionless 772 M 0 Fig 6 249

A choke coil is needed to operate an arc lamp at 250 V rms and 50 Hz The lamp has ar effective resistance of 1502 when running at 10 A rms The inductance of the choke coil is N 125T H Find the value of N

A planet of mass m is revolving around the earth at a height of R from earth surface Speed of this satellite is V speed of another satellite of mass 2m and revolving at a height 3R from earth surface will be A B V 2 2V

A massless spring of spring constant k has two ends P and Q as shown in the figure End Q is being pulled by person B with constant speed u towards right End P is being pushed by person A with constant acceleration a towards starting from rest Both starts simultaneously Choose the correct option at the instant when B appears to be at rest with respect to A right A P a A B C mmmm O u B work done by B ku 3a work done by A 5ku 24a work done by A 5ku 24a

Sir Ma am please explain the area calculation in details in the part above x axis because in the part beside 0 to 10 al ong positive y axis there is no force starting and just forc e starts from 10N so in this case how can we calculate the area of that part please explain 9 Figure shows the variation of a force F acting on a particle along x axis If the particle begins at rest at x 0 what is the particle s coordinate when it again has zero speed F N 20 104 10 20 1 2 1 x 3 3 x 5 3 4 5 6 18 9 10 2 X 6 4 x 7 x m

An idealized diesel engine operates in a cycle known as air standard diesel cycle as shown Fuel is sprayed into the cylinder at the point of maximum compression B Combustion occurs during expansion BC P B C A B C D Adiabatic Process D A V Heat is absorbed during process BC Heat is released during process DA Heat is absorbed during process CD Efficiency of the cycle is 1 To TA

English 36 37 38 Question No 41 39 40 In a problem an equation is given by A A O Velocity 2 VMV represent the physical quantity Kinetic energy Momentum Time Left 177 32 Force 41 42 cose In this problem Y Marks 4 1

Example 6 7 A block of mass m can slide freely in a slot made in a bigger block of mass M as shown in Fig 6 260 There is no friction anywhere in the system The block m is connected to one end of a string whose other end is fixed at point P System is released from rest when the string at P makes an angle with horizontal Find the accelerations of m and M just after release M Fig 6 260

In sonometer experiment the string of length L under tension vibrates in second overtone between two bridges The amplitude of vibration is maximum at MHT CET 2017 L 2L 5L A B LOS C 5 3 3 LLL Pen 3 24 6 6 LLL 2 8 4 2 L L 5L 2 62 6 ww

5 Two tunning forks have frequencies 380 and 384 Hz respectively When they are sounded together they produce 4 beats second After having the maximum sound how long will it take to hear the minimum sound 1 1 second 1 3 second 8 2 4 1 1 16 second second

A hemispherical glass paper weight of radius 10 cm contains a small air bubble located at a distance of 4 cm from its flat surface on its axis of symmetry What is apparent shift in the position of air bubble when it is looked by observer from top 4 Refractive index of glass 3

In the figure ab and cd are two long conducting wires kept parallel to each other at a separation I in a uniform time varying magnetic field The ends a and c are connected together by a resistor of resistance R The magnetic induction B perpendicular to the plane of the wires varies with time according to the relation B Bot where B is a positive constant with proper unit and t is the time in second A conducting wire PQ placed on the wires ab and cd and dragged on the wire with constant speed v along the length of the wires by applying a constant force F At t 0 PQ is very close to ac Ignore any resistance electrical as well as mechanical other than R Find the value of FR 250 R 1 y X X RX X X a www X X X X X X X X O X X X X F X X

A plano convex lens when silvered in the plane side behaves like a concave mirror of focal length 30cm However when silvered on the convex side it behaves like concave mirror of focal length 10 cm Then the refractive index of its material will be

In a resonance tube experiment a vibrating tuning fork is held above the open end water level is gradually pushed down The first the second resonances occur when the water level is 24 1 cm 74 1 cm respectively below the oper end The diameter of the tube is A 2 cm C 5 cm HOTE MHT CET 2019 4 cm 3 cm B 1 DY

Is Eg 1 Y bisons 6 50 ww 7 602 Internal resistances are 0 5 ohm 0 4 ohm respectively and E1 15 V and E2 12 V If switch S is 1 open 2 closed By applying Kirchoff s law calculate the value of 11 12 and 13 and the current in each of the remaining branches of the network shown in figure

Example 6 3 Pulleys shown in the system Fig 6 244 are massless and frictionless Threads are inextensible The mass of blocks A B and C are m 2 kg m 4 kg and m3 2 75 kg respectively Calculate the acceleration of each block 06 Fig 6 244

Example 6 6 The mass of wedge shown in Fig 6 256 is M and that of the block is m Neglecting friction at all the places and mass of the pulley calculate acceleration of the wedge Thread is inextensible M 07 Smooth Fig 6 256

It is once suggested that the mirror for an astronomical telescope could be produced by rotating mercury in a container at a prescribed angular velocity about a vertical axis With what angular velocity in rad sed the disk be rotated to produced a 10 cm focal length mirror Give answer in nearest integer

A car moving with an initial velocity of 5 mph accelerates at the rate of a t 2 4t mph per second for 8 seconds a How fast is the car going when the 8 seconds are up b How far did the car travel during those 8 seconds

27 28 29 30 Question No 29 OX 31 32 A body is projected vertically upward from the surface of the earth the speed time graph is doi 33

Light rays can enter from flat circular surface of a transparent cylinder The minimum value of refractive index of material of cylinder is such that no ray can emerge from curved surface of cylinder Find R 20

162 3 The energies of three conservative energy levels L3 L and L of hydrogen atom are E respectively A photon of wavelength is emitted for a transition L to L What will be the wavelength c emission for transition L to L 31 19 20 2 4E0 9 27A 7 and Eo 4

A bead of mass m is located on a parabolic wire with its axis vertical and vertex directed toward downward as in figure and whose equation is x ay If the coefficient of friction is the highest distance above the x axis at which the particle will be in equilibrium is a Find the value of n 4

56 A light source emitting a light of frequency 6 1015 Hz is moving away from an observer with a speed of 4 m sec Then the apparent change in the frequency of light as observed by the observer will be 1 8 107 Hz 3 2 107 Hz 2 4 107 Hz 4 8 108 Hz

ottom oI A wheel of radius R and mass M is placed a fixed step of height R as shown in the figure A constant force is continuously applied on the surface of the wheel so that it just climbs the step without slipping Consider the torque t about an axis normal to the plane of the paper passing through the point Q Which of the following options is are correct JEE Adv 2017 a b c d P S R If the force is applied at point P tangentially then decreases continuously as the wheel climbs If the force is applied normal to the circumference at point X then t is constant If the force is applied normal to the circumference at point P then t is zero If the force is applied tangentially at point S then t 0 but the wheel never climbs the step

Negative Marks In all other cases For Example If first third and fourth are the ONLY three correct options for a question with second option being an incorrect option selecting only all the the without selecting any incorrect option second option in this case will result in 2 marks Selecting only one of the three correct options either first or third incorrect option s second option in this case with or without selection of any correct option s will result in 1 marks A particle is projected from ground at an angle 9 At a certain instant the velocity vector of particle makes an angle a with horizontal dv g ofd gsince modulus of Tangential acceleration has magnitude of g sin a Normal radial acceleration g cos a

Acceleration of a particle which is at rest at x 0 is a A B D particle further comes to rest at x 4 particle oscillates about x 2 maximum speed of particle is 4 units all of the above 4 22 i s 2x i Select the correct alternative s

A wheel starting from rest is uniformly accelerated at 2 radis2 for 2 seconds It rotates uniformly for the next 2 seconds and is finally brought to rest in the next 2 seconds calculate the total angular displacement of the wheel

19 A property R of a circular disc of thickness dx dx and area A is defined as A same property R for the cylinder shown in figure dx 1 TV4 K 2KL TDd L 2 R k W D J 2KL D d d Find the

Two strings A and B of same material are stretched by same tension The radius of the string A is double the radius of string B Transverse wave travels on string A with speed VA and on string B with speed VB The ratic V MHT CET 2016 VB A C 2 is 142 LOB D 1 2 4

What is physics Name its various branches How are different sciences related to physics Give five examples to explain the relation of physics with technology 2 What are the various branches of physics Explain in brief the field of these branches 3 4 Describe in brief the scope and excitement in physics Max Planck said We have no right to assume that any physical laws exist or if they have existed upto now that they will continue to exist in a similar manner in the future Comment 5 In the words of Bertrand Russel We know very little and yet it is astonishing that we know so much and still more astonishing that so little knowledge can give us so much power Justify the statement 6 In the Alexan compre Comm 7 Scien unders a few 8 Wha prop kinc 9 Stat and ap

PHYSI Gradually lowered mass stretches the spring by y metre If same body attached to the same spring is released suddenly the maximum stretch in this will be A same B double C triple D half T

11 A uniform thin rod of length 4a 2a and of mass 4m 2rm is bent and fabricated to form a square surrounded by semicircles as shown in the figure The moment of inertia of this frame about an axis passing through its centre and perpendicular to its plane is Olympiad 2014 stage 1 4 2 ma 3 A B 4 ma 2 C 4 3 ma 3 D ma 10 3 3

The vibrations of a string of length 60 cm fixed at both ends are represented by displacement cos 96 t where x and y are in cm TUX y 4sin 15 and t in second The particle velocity at x 22 5 cm and t 0 25 s is CAS C zero 1 100 cm s B D MHT CET 2019 4 x 96 cm s 1 1 96 cm s

With reference to given figure where current enters a circular loop at a point P through a straig and leaves at Q through another straight wire both of which appear to pass through centre v the net magnetic field at the centre of circular coil of radius R Here 1 and 12 are the length two segments of the circular loop 1 Zero 14 2 Ho 2 4 2 R 4 1 Ho 14 2 3 4 R 1 1 4 M Ho 14 2 2R2 4 12

The figure shows a metallic strip whose resistance is such that current flowing through the battery is 4 8 A If B 1 T width of strip 1 cm and number density of free electrons 1029 m then potential difference developed across the width of the strip is V E B Thickness b 1mm

A C A simple harmonic progressive wave is represented by y A sin 100 t 3x The distance between two points on the wave at a TU phase difference of radian is 3 T 18 T 3 m m B D MH CET 2010 RIO RO 6 8 m 8

In the shown figure B and B2 are two boxes which can contain only R or C or L or series combination of any two or a three If emf of source S and current through source are in phase then mark the correct option S B B If B contain R then B may contain R only IfB contain R then B may contain L C R If B contain L R then B2 may contain R C If B contain L R then B may contain L C R

The figure present an arrangement in horizontal plane It consists of a parallel plate capacitor with one of its square plate fixed by means of an insulating support While the other plate is attached to the free end of a spring made of insulating material of force constant K If the capacitor carries charge Q and battery is disconnected mass and side length of plate A be M and L respectively time period of oscillation of A assuming that it does not strike B would be ignore any friction A B mtum K US14

The fundamental frequency of an air column in a pipe closed at one end is 100 Hz If the same pipe is open at both the ends the frequencies produced in Hz are MHT CET 2017 A 100 200 300 400 B 100 300 500 700 200 300 400 500 D 200 400 600 800

A dumbbell is constructed by fixing small identical balls at the ends of a light rod of length 1 The dumbbell stands vertically n the corner formed by a frictionless wall and frictionless floor When it is slightly disturbed the dumbbell begins to slide and he lower ball moves towards right At the instant when the upper ball leaves the wall mass of each ball is m