Basic Physics Questions and Answers

Two blocks are connected to an ideal spring of stiffness 200 N m At a certain moment the two blocks are moving in opposite directions with speeds 4 m s and 6 m s and the instantaneous elongation of the spring is 10 cm The rate at which the spring energy kx2 2 is increasing is A 500 J s B 400 J s C 200 J s D None A particle is moving on y avie has potential energy 11 2 20x 5 Joules along y

Two cells of emf 2 V and 4 V respectively and internal resistance 10 each are connected in series with emf in opposite sense The equivalent emf of the combination is fa far u 1 0 33 ufafafa faudrufaa OPTIONS MARK FOR REVIEW CLEAR SELECTION OA 6 V B 2V C 3V D 10 V

Assertion A When both gravitational and viscous forces are predominant in a flow scale ratio can be chosen at will Reason R With both gravitational and viscous forces being predominant scale ratio depends upon kinematic viscosity of the fluids CS 97 ill flow

From the configuration shown in the figure B is a particle which moves with constant velocity along x axis A is a particle that moves with same speed as B but has its velocity always directed towards B At t 0 B is at 3a 0 and A is 0 4a Final distance between A and B is found to be constant and equal to x a find x 4a 3a B u AY L X

Assertion A The kinematic viscosity of both air and water decreases as the temperature increases Reason R The kinematic liquids and gases at a given function of temperature viscosity of pressure is a ble CS 99

Iz A B to Two infinitely long wires carry currents I1 and 12 and are placed as shown in the figure Loops A and B are also on the same plane as the wires and are pulled in opposite directions Find the direction of the induced current in each loop

34 An evacuated thin tube has two tight caps C and C at its ends The tube is adjusted as shown in the figure below A h P dg P B h dg C h Atmospheric pressure P and density of the liquid d Neglect surface tension of liquid Match the entities of columns Column I P dg h 0 h 0 h 0 P D h h dg A h 0 Atmosphere Non viscous incompressible liquid B h C Atmosphere Column I P If C is opened first and then C is opened liquid level in the left arm of the tube will be on level with liquid in the pot Q If C is opened with C closed liquid will rise in the left arm but tube will not be fully filled R If C is opened with C closed tube will be fully filled with liquid S If C is opened first and then C is opened liquid will flow down continuously T After any of the above action pressure at the mid point of tube AB is non zero

suppose A and B standing at a distance x apart in an open field such that the lin e joining them is perpendicular to the di rection of wind by maintaining the sepa ration x What will be the time lag B find s between seeing and hearing the drum s being played by A Please explain what is the actual veloci ty of sound and relative velocity of sou nd w r t wind

dx Find the directional derivative of the scalar function x 2y 4z at 1 1 1 the direction 2 k Find the scalar potential if the given vector function is irrotational A x 2y az bx 3y z j 4x cy 2z k

TO 300 www 300 Q 00 60 V 30 V wwwwww 400 S 2 A 292 302 B Sere 30 D 202 Fig 3 70 Fig 3 71 21 Find the potential difference between points A and Bi e VA VB in the network shown in Fig 3 71

State Gauss divergence theorem Use divergence theorem to evaluate ff F dS wher F 4x 2y j z k and S is the surface bounding the region x y 4 z 0 an z 3

39 At t 0 a stone of mass 10g is thrown straight up from the ground level with a speed 10 m s Arte a second stone of the same mass is thrown from the same position with a speed 20m s What is the position of the first stone from the ground level at that moment Taken g 10 m s2 1 10 m 2 1 m 3 2 m 4 5 m mat br The acceleration of the particle will with time t as

a b 4 a b V 2 In the circuit shown the readings of voltmeter V V and V3 at resonance are given by 3 V R V oooooo L V E E sinwt w 1 LC C 24 The readings of voltm circuit are respectiv X 50 A 1 20 V 1 A 3 40 V 4 A Ankach Tower 8 Pusa Roas

ALLEN The linear density of a vibrating string 29 is 10 kg m A transverse wave is propagating on the string which is described by the equation y 0 02 sin x 30t where x and y are in meters and the time t is in seconds The tension in the string is 1 0 09N 2 0 36N 3 0 9 N 4 3 6N y 0 02 sin x 30t xala 1 0 09N 2 0 36N 10 kg m a forent affa 3 0 9 N 4 3 6N

Three of your friends are pulling a object placed on ground with forces shown in diagram When they are unable to push the object they call you for help Instead of pulling the object directly you start calculating the minimum force required to move the object May be you are intelligent may be you are lazy You find that minimum force required in any direction should be 60 N The minimum force you should apply to move the object is Assume that your friends are still applying force in the earlier directions 20N A 34 N C 38 N 37 53 10N 15N B 20 N D 60 N

09 T Two particles A and B start moving simultaneously from a point P on straight line paths Their paths make an angle of 37 with each other as shown in the figure One of them moves with uniform speed of 10 m s and the other with 8 m s Path of particle A 37 Path of particle B Distance between the particles 40 s after they leave point P is closed to a 192 m c 320 m b 240 m d 426 m

A boy stands 4m from a vertical wall and throws a ball The ball leaves the boy s hand at 2m above the ground with initial velocity v 10 10 m s When the ball hits the wall its horizontal component of velocity is reversed and its vertical component remains unchanged Where does the ball hit the ground measure distance from wall A 4 m C 18 m B 12 m D 16 m

38 39 ALLEN Two ends of a rod of non uniform area of cross 38 section are maintained at temperature T and T T T as shown in the figure T If I is heat current through the cross section of conductor at distance x from its left face then the variation of I with x is best represented by 1 2 3 r The temperature of a body falls from 62 C to 39 CARG sa fort ant fanger T a T TT NIN 21 feuchte X pada anda 1 2 3 r o X 10 fz 62 C frent

In an experiment on the determination of Young s Modulus of a wire by Searle s method following data is available don t consider significant figures Normal length of the wire L 110 cm Diameter of the wire d 0 01 cm Elongation in the wire 0 125 cm This elongation is for a tension of 50 N The least counts for L d and I are 0 01 cm 0 00005 cm and 0 001 cm respectively Calculate the maximum percentage error nearest aximum percentage error to an integer in calculating the value of Young s modulus Y

A car is moving with a velocity 54 km hr and then breaks are applied which provides a deacceleration of 5m s2 Then the displacement of the car in 10 sec will be B 100 m D 45 m A 100 m C 22 5 m

A particle is oscillating in SHM What fraction 23 of total energy is kinetic when the particle is at A 2 from the mean position A is the amplitude of oscillation 1 3 4 2 2 4 3 4 7 4 5 7 fa f det ta ki a hat A 2 A 1 3 4 2 2 4 3 4 7 4 5 7

O 15 cm A concave mirror is moving with velocity 41 21 cm s1 whereas a point object is moving with 87 11 cms 1 as shown in figure The object is at a distance of 15 cm in front of mirror whose focal length is 10 cm The axial velocity of image is v then 1 4xn find the value of n

Consider the circuit as shown in diagram In steady state 100 V sk 492 L 2 mH www 2023 reeeee 4 mH L Current through inductor Z is 25 A Potential difference across 12 is zero Energy stored in inductor Z2 is 1 25 J Current through la is zero

In the given circuit the potential difference between poin A and B is 18 V and charge on 2 F capacitor is 24 C The energy stored in capacitor C is 2 F A 6 F H 72 J 144 J 36 J C B

large number of molecules An ideal gas is taken through the cycle A B C 18 A as shown in the figure If the net heat supplied to the gas in the cycle is 5J the work done by the gas in the process C A is V m A 10P N m 1 5J 2 10J 3 15J 4 20 J 81 fa the farger Afa V m 4 2 C ABC F A 10P N m 1 5J 2 10J 3 15J 4 20 J

If C and C denote the specific heats of nitrogen 41 fe C C fa sch per unit mass at constant pressure and constant fed ad f volume respectively then 1 C C R 28 3 C C R In a thermodynamic 2 C C R 14 4 C C 28R process temperature and 42 1 C C R 28 3 C C R 2 C C R 14 4 C C 28R vannfach e

The speed of a small object undergoing uniform circular motion is 4 m s The magnitude of the change in the velocity during 0 5 s is also 4 m s 2T 6 36 A The angular speed of object is rad s 3 8T B The centripetal acceleration of object is 3 5 m s 6 C The radius of the circle is m the MmEVA JAYATE 3 D The radius of the circle m

Maximum and minimum magnitude of resultant of two vectors of magnitude p and q are in the ratio 3 1 which of following relation is true p q A p 2q C pq 1 B p q D None of these

A simple pendulum and a homogeneous rod 27 pivoted at its end are free to oscillate with small amplitude What is the ratio of their periods of swing if their lengths are identical TT 2 3 2 4 2 1 1 1 1 3 che ci cred 1 1 1 en le for a af TT 2 3 2 4 2 1

A sound source is moving with speed 4 m s 34 towards a wall If the velocity of sound is 320 m s the stationary observer would hear beats is equal to frequency of source 240 Hz 1 0 2 0 or 6 3 6 4 0 or 8 af 4 m s fra af site m 320 m s frerester 240 Hz 1 O 3 6 2 06 4 08

If a body losses half of its velocity on penetrating 3 cm in a wooden block then how much will it penetrate more before coming to rest A 1 cm B 2 cm C 3 cm D 4 cm

A capacitor and resistor are connected with an AC source as shown in figure Reactance of capacitor is X 302 and resistance of resistor 402 Phase difference between 37 current I and I is A 90 C 53 X 352 R 40 www V V sin cot tan B Zero D 37

69 10 The efficiency of carnot engine when source temperature is T and sink temperature is T will be a O T T T T T2 T b d T2 T T T T 1 A capacitor of the capacitance 10 F is charged by connecting through a resistance of 2002 to a battery of 20V as shown How much energy is supplied by the hattery

Light of wavelength 6000 from a distant source falls on a slit 0 5 mm wide The distance between first order dark bands on each side of the central bright band of the diffraction pattern observed on a screen placed at a distance 2m from the slit is 1 2mm 2 4mm 3 6mm 4 8mm

A uniform cylinder has a radius R and length L If the moment of inertia of this cylinder about an axis passing through its centre and normal to its circular face is equal to the moment of inertia of the same cylinder about an axis passing through its centre and normal to its length then 1 L R 2 L 3 R 3 L 3 4 L 0 5340 connected in the 45 Uch UCHAR L E el face fu yakala GREGRO a qui a anar a 1 L R 2 L 3 R 3 L 3 4 L 0 Before Brysten erfufa au f

A particle moves along a straight line and its position as a function of time is given by x t 3t 3t 3 then particle A stops at t 1s and reverses its direction of motion B stops at t 1 s and continues further without change of direction e

A house is to be moved A car pulls with a force of 250 N at an angle of 25 degrees North of East A pickup truck pulls with a force of 600 N at an angle of 20 degrees east of north Determine by scale drawing the resultant force on the boulder

If a particle is moving on straight line p ath along positive direction whose acc leration displacement relation is a a x where a is positive constant find vel ocity time relation a acceleration alpha

In a certain system of absolute units the acceleration produced by gravity in a body falling freely is denoted by 5 the kinetic energy of a 500 kg shot moving with velocity 400 metres per second is denoted by 2000 and its momentum by 100 The unit of mass is 200 kg 400 kg 800 kg 1200 kg

Q1 A spherical ball of radius 0 15 cm takes 6 seconds to travel a distance of 80 cm through a viscous liquid If the density of ball is 8x 10 and that of liquid is 1 2 x 103kg m find

Sync Last Sync 12 16 PM PHY SEC I Question 18 PHY SEC II Numeric Type Instructions PHY SEC III Question Paper CHEM SEC I CHEM SEC II CHEM SE QUESTIO A body is projected upwards from level ground with certain speed at an ar

A liquid flows through a pipe of diameter 10 cm with a speed of 0 5 m s The density of liquid is0 8 x 10 kg m and the coefficient of viscosity is 0 4 Ns m Determine Reyoind s number and state whether the flow is turbulent or stream line 1 Given diameter 10 cm

A flag is mounted on a car moving due to north with velocity of 20 km hr Strong wind is blowing due east with velocity of 20 km hr The flag will point in the direction 1 East 2 North East 3 South East 4 South West 45

13 A long triangular open channel with two different side slopes these are 2 1 and 3 1 H V The Manning coefficient is 0 014 the flow discharge 15 m3 s And the longitudinal bed slope 0 004 Critical depth is 2 Points 1 5891 0 585 0 367 O1405

without selecting any incorrect option second option in this case will result in 1 marks Each of the following planar objects is placed as shown in figure between two frictionless circles of radius R The mass density per unit area of each object is o and the radii to the points of contact make an angle 8 wit horizontal For each case find the horizontal force that must be applied to the circles to keep them together F 0 Choose the correct option s 0 L R For 8 For 8 cos 1 F For 90 and object being an isosceles triangle with common side length L force will be maximum L 5 1 T and object being a rectangle of height L force will be maximum and object being a circle force will be maximum 2 For 80 and object being a circle force will be maximum

The taylor series expansion of the function In cosh x where x is real about point x 0 starts with the following terms c 1 x 12 1 1 2 x x 4 b 1x 2 2 1 4 12 1 x x 6

D What is law of levers One end of a uniform weightless rod of length 3 m is pivoted and works as fulcrum A load W acts on this rod at distance 1 m from the fulcrum What minimum effort is required on the other end of the rod to lift this load What class of lever is this rod What is its mechanical advantage

A mass which is free to move on a horizontal frictionless surface is attached to one end of a massless string that wraps partially around a frictionless vertical pole of radius r see the top view in figure You hold on the other end of the string At t 0 the mass has speed vo in the tangential direction along the dotted circle of radius R shown Your task is to pull on the string so that the mass keeps moving along the dotted circle You are required to do this in such a way that the string remains in contact with the pole at all times You will have to move your hand around the pole of course The mass can be kept moving in the circle only upto time T sec Find the value of T Given R 2r 2m vo 5 m s top view hand

a ground to ground projectile with zero air resistance choose the correct statement s 0 0 Clear Respons A projectile is freely failing body Acceleration of projectile is maximum at the highest point in its flight Time of flight is maximum when the range of projectile is maximum Acceleration perpendicular to the velocity of projectile is maximum at

Two persons Ram and Shyam are throwing ball at each other as shown in the figure The maximum horizontal distance from the building where Ram can stand and still throw a ball at Shyam is d The maximum horizontal distance of Ram from the building where Shaym can throw a ball is d If both the of them can throw ball with a velocity of 2 gh find out the ratio of 2 d Neglect the height of each person h Shyam Ram