Basic Physics Questions and Answers

SECTION 1 Answer all questions max marks 20 assume g 10 m s if required 1 A straight line represents uniform velocity acceleration in the distance time velocity time graph 2 2 The area under the V T graph represents for uniform acceleration motion only both uniform and non uniformly accelerated motion 2 3 A 20N force acts on moving body for 5s to bring it to rest What was the a initial momentur the body and b the momentum 3s later 3

Q 16 75 Both batteries in the given circuit are ideal If an ideal voltmeter is connected between the points P and Q it shows a reading 20V 392 www www 122 21 6 V 16 8 V 14 4 V Zero P 492 www Q www 252 12V

re wire toop having side a mass III uniform steady magnetic field B Bo k at t 0 sec as shown in the figure The magnitude of Vo is sufficient so that the loop comes out from region of magnetic field with V Neglect any type of energ loss other than heat loss in resistances of wires of square given Vo 3B a mR Read above passage carefully and answer the following questions OA a A The plot of speed of square versus position x will be represented by lo 3a O a B a 2a 3a 2a 3a resistance K is moving along positive X axis with speed Vo enters into X X lo lo a a 2a 3a 2a 3a X X

Two blocks connected by a horizontal link AB are supported on two rough planes shown in figure The coefficient of friction for the block on the horizontal plane is 0 35 The limiting angle of friction for block B on the inclined plane is 25 What is the smallest weight W of the block A for which equilibrium of the system can exist if weight of block B is 6 kN Weight of the link AB is negligible A 30 B

A uniform disc of mass M and radius R is mounted on an axle supported in frictionless bearings A light cord is wrapped around the rim of the disc and a steady downward pull T is exerted on the cord The angular acceleration of the disc is Question Type Single Correct Type 1 2 T MR T MR T

1 State the law of motion which defines force in terms of momentum 2 A horse is pulling the cart to the right The forces named F G are acting on the cart forces H and K are acting on the horse G and K are the frictional forces the ground applies on the cart and the horse respectively a From among these identify a pair of action reaction forces b Rank the forces F G H and K by magnitude smallest first 3 A body of mass 6 kg is dropped from a height of 5m CART GROUND 3 a What is its momentum just before it strikes the ground b It takes 0 4s to come to rest after touching the ground which is soft What is the average force applied by the ground HOP

Two small balls of same size and masses m and m 6 fac cu m 7 m m m van aivan y fafra Sand go for a few sealed m m are tied by thin weightless thread and drop from certain height If upward buyoncy force Facting on it the tension T of thread during the flight after the motion of ball become uniform is m 12 1 m m 3 m m g 2 m m g 4 m m 1 m m 3 m m g 2 m m g T

Consider following circuit and select correct alternative s 2V www D 60 www 60 402 40 www 40 30 O Current through each cell is A 1 Current through each 602 resistance is 6 Current through each 30 resistance is A 3 Current through each 402 resistance is A A 2

8 For the circuit shown below when the switch S is closed then the total amount of charge that flows from point a to point b through the switch is 12 F www 69 H 9V b CS 4 F HH a 392 O C

3 The switch in the circuit pictured is in position a for a long time At t 0 the switch is moved from a to b The current through the inductor will reach its first maximum after moving the switch in a time www 1 2 LC 2 LC

The edge length of the unit cells constituting simple cubic lattice bec and fee unit cells in term of the radius of spheres r are respectively 1 1 22 3 3 44 1 0 5r 0 43r 0 35r 2 0 35r 0 43r 0 5r 3 2r 2 31r 2 83r 4 2 83r 2 31r 2r The biopolymer stored in animal body is

An uncharged capacitor C 100 F with a resistor R is connected with AC source as shown in the figure If R is 50 and switch S is closed at t 0 the maximum value of VA VB is K volt Calculate K C 100 F www 10022 A B www R www 10002

Q 6 In the following Figure find the speed and direction of the follower D if driver A rotates at 500 rpm in clock wise sense and Gear B and C are mounted on same shaft 5 EB TA 30 Tg 45 T 25 Tp 40

A student measures the mass of an object five times The data are 2 46 kg 2 47 kg 2 41 kg 2 42 kg and 2 44 kg The reported mean mass with error should be Question Type Single Correct Type 1 2 3 4 2 44 0 01 kg 2 44 0 02 kg 2 44 0 03 kg 2 44 0 04 kg

Consider two sets of a measurement Set 1 10 8 g 10 7 g 10 9 g Set 2 10 431 g 10 742g 9 821 g Set 1 0 is more precise than set 2 is less precise than set 2 has higher mean absolute error in comparison to set 2 has lower mean absolute error in comparison to set 2

The image formed by convex lens is real and magnified Now if we cover a half of the lens by black paint as shown in the figure then ons 1 1 22 3 3 1 Size of the image will diminish 2 Full image will not be formed 3 Position of image will change 4 Brightness of the image will diminish

A particle in a rectilinear motion is at origin at time t 0 velocity v of the particle related to the distance travelled x by the particle as v 5x 2 x is in metre and t is in second Thus velocity of the particle at t 0 is

then 10V 202 mono A Current just after switching is 20 Amp 3 C Current in the circuit varies e 0000 IH shifted to position 2 B Current just after switching is 4 Amp D Current just after switching is 0

1 A ray of light passes through an equilateral glass prism such that the angle of incidence equals the angle of emergence which is equal to 0 75 times the angle of prism The refractive index of the prism is A 3 2 C 2 1 2 B 21 2 D 5 4

uniform semi circular ring is placed on rough inclined plane as shown If friction is large for no sliding then the minimum angle 9 at which toppling occurs is tan 2 tan 1

A 30000 kg air plane takes off at a speed of 50 m s and 5 min later it is at an elevation of 3 km with a speed of 100 m s What average power is required during this 5 min if 40 percent of the power is used in overcoming dissipative forces 1 09 F

Catalyst Package for NEET 33 10 F 2mg 10 B 10 m 2m 36 F mg In the figure the blocks A B C of mass m each have acceleration a a2 and a respectively F and F are external forces of magnitudes 2mg and mg respectively 1 a a 83 2 a a3 a2 3 a a2 a2 a3

waves Normal Modes of Oscillation of an Air Column with One End Closed and Other Open Closed Organ F A glass tube partially filled with water is an example of such a system Further a closed organ pipe is closed at one end also illustrates this system

3 4m from u 16 A force F is acting between two charges in air If the space between them be completely filled with a medium K 4 the force will be 1 F 2 4F 3 F 4 4 2F amb are

On a two lane road car A is travelling with a speed of 36 km h two cars B and C approach car A in opposite directions with a speed of 54 km h each At a certain instant when the distance AB is equal to AC both being 1 km B decides to overtake A before C does What minimum acceleration of car Bis required to avoid an accident A 9 8 ms 2 B 10 ms 2 C 1ms 2 D 2 0 ms 2

2 The adjoining D T graph describes the motion of A and B Study the graph and answer the following a What is the distance between them at t 0s b What is the distance between them at t 4s c How far from the origin do they meet d What is the speed of B 100 40 0 M

In a region of space both electric and magnetic field are present simultaneously in opposite directions A positively charged particle is projected with certain speed an angle 0 90 with magnetic field It will move in a 1 Helical path of uniform pitch 2 Helical path of increasing pitch 3 Helical path of decreasing pitch 4 Helical path whose pitch first decreases and then increases

Q4 Derive an expression for electrostatic potential at any point due to a point charge 2 Q5 Two point charges of 1 C and 4 C respectively are placed at 12 cm apart Find the position of the point where electric field is zero 2 Q6 Define the term electric dipole moment and derive the expression for electric field intensity due to dipole on its

A spring of spring constant 2000 N m is suspended vertically in earth s gravitational field and a mass of 0 8 kg is hung from it It is hanging in equilibrium At t 0 a force of 72 N starts acting in vertically downward sec If the amplitude of resulting SHM in mm after that is A 2 direction The force ceases to act at t then find value of A 12 TU

A current carrying circular coil of 1000 turns and radius 10 cm produces a magnetic field of 3 14 x 10 4 T at its centre The value of current is mA Answer 0 8 9 1 2 3 4 5 6 7 00 01 02 3 4 5 6 7

PHYSICS Q1 Three equal charges q each are placed at the vertices of a square electric field at centre O will be AR a q 4 a b Medic 2 a 9 c dations shown in the figure The intensity of 1 2E Fot 9 2 a d 29 2 Ta

Three identical balls each of mass m 0 5 kg are connected with each other as shown in Fig and rest over a smooth horizontal table At moment t 0 ball B is imparted a horizontal velocity v 9ms Calculate velocity of A w r t ground in m s just before it collides with ball C

The flux linked with a circuit is given by 32 7 The graph between time x axis and induced emf y axis will be O A straight line O Circle O Parabola O None of these

Four particles each of mass M are located at the vertices of a square with side L The gravitational potential due to this at the centre of the square is Question Type Single Correct Type 1 32 GM 2 64 GM L

1 Two conductors of same material having equal lengths but radii in the ratio of 1 3 are connected in series across a battery The drift velocities of free electrons through them I will be in the ratio of a 3 1 b 1 3 c 4 9 d 9 1

Five rods with identical geometries are arranged as shown Their thermal conductivities are shown Only A and Care maintained at 100 C and 0 C respectively In other words heat flows in from A and flows out of C If temperature difference between ends D and B can be written as 102 C where z is an integer Then find z A D K 2 2K E K F 3K B K 2 C

Figure shows two vectors a in y z plane and b in x y plane such that a b 5 units What is angle between a and b 3 A 0 cos C 0 cos 12 25 9 25 B D 0 cos 0 90 16 25 N4 37 37 b

3 36 10 2 N 5 A charge Q is divided into two parts q and 42 such that they experience maximum force of repulsion when separated by certain distance The ratio of Q q and q is 1 1 1 2 2 1 2 2 3 2 2 1 4 2 1 1 charge of 10 units so that

A particle is projected from the level ground at an angle of 60 from the horizontal with a speed of 40 m sec then correctly match the column I II and III take g 10m s Column l Column II Speed 40 m sec y 20 m sec z 40 m s Angle of velocity From the horizontal p 60 q 0 r 30 Column III Distance m i 60 ii 19200 160 3

f 1 su Options O Four time Oeight time 3 O Sixteen time T O three time Auf

Please answer must be correct and from the source of choose the correct answer of the following mcq questions with a short explanation as possible Subject Antennas and propagation Sources Antenna Theory Analysis and Design 3th 4th Edition material sheets link https drive google com file d 1BsAOAv7ihL3vrdEFIH1Nv8zySY7awbte view usp sharing 8 The refractive index n and refractivity N of air usually vary with height above ground as a both decrease with height c both increase with height b n decreases and N increases with height d none of these 167 Tamburl

A steel ring of radius r and cross section area A is fitted on to a wooden disc of radius R R r If Young s modulus be E then the force with which the steel ring is expanded is Question Type Single Correct Type R 1 AE r 2 AE R r r

In system shown in fig 1 79 C the coefficient of static friction 3 between m and m is and that between m2 and M is All other surfaces are frictionless Given that M 13 4 kg m 1 kg m 2 kg and m3 3 6 kg a What minimum force F must be applied to M so that m does not slip on M b What is the maximum value of F for which m does not F m m M

18 Two point charges of 2 C and 6 C repel each other with a force of 12 newton If a charge of 4 4 C is given to each of these charges the force will be now 1 Zero 3 8N repulsive 2 4N attractive 4 4N repulsive

A ball of mass m is suspended by a massless string of length L from a fixed point A ball of mass 2m strikes in the direction of 0 45 from horizontal and sticks to it If the velocity is n ge so that system deflects by 2 find A m 2m 45

the figure shown water is filled in the cylindrical tank of cross sectional area 100 cm up to a height of 10 cm The mass of the thin tight fitting and frictionless piston is 100 kg The small hole in t iston has area 2 2 mm Due to weight of the piston water spurts upwards in a jet from the hole Find the time in sec in which the tank becomes empty Assume that spurted water does not f ack on piston

27 A boat is sailing at a velocity 31 4 respect to ground and water in river is flo with a velocity 31 43 Relative veloc the boat with respect to water is 1 81 3 61 8 JAIPMT 1 2 5 2 4 61 81

In certain electronic transition from quantum level n to ground state in atomic hydrogen in one or more steps no line belonging to Brackett series is observed The wave numbers which may be observed in Balmer series is 8R 5R 9 36 3R 8R 16 9 5R 3R 36 16 3R 3R 4 16

Photon with kinetic energy of 1MeV moves from south to north It gets an acceleration of 1012 m s by an applied magnetic field west to east The value of magnetic field Rest mass of proton is 1 6 x 10 27 kg 1 71mT 2 7 1mT 3 0 071mT 4 0 71mT

A barometer with a brass scale reads 75 cms at a temperature of 16 C What will be the reading at 6 C if the coefficient of linear expansion of brass is 18 x 10 6 C and that of cubical expansion of mercury is 18 10 5 C A 73 785 cm C 76 215 cm B 73 515 cm D 76 485 cm