Basic Physics Questions and Answers

Q75 A piece of copper and other of germanium are cooled from the room temperature to 80 K then a resistance of each will increase b resistance of copper will decrease c resistance of copper will increase while that of germanium will decrease d resistance of copper will decrease while that of germanium will increase

Q 25 75 In the given network a battery of emf 15 V and internal resistance 1 402 is connected directly between the points B and C The current in Amperes through the branch BC is A www 6523 D 392 1002 492 www B 202 C

A small block is at rest on the floor of a railroad boxcar that has length 20 as shown in the figure The coefficient of kinetic friction between the floor of the car and the block is u There is no friction between car and ground The car originally at rest begins to move with constant acceleration a Assume a ug wwwwww TITTIT

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