Basic Physics Questions and Answers

A circular portion is cut of a disc of thickness t its resistivity is p and radii of disc are a and b b a A potential difference is maintained between outer and inner cylindrical surfaces of the disc What is resistance of the disc Question Type Single Correct Type n 2 P 1 1 In 2nt 3 2 pt 1 2 1 2 2T

Three equal mass satellites A B and C are in coplanar orbits around a planet as shown in the figure The magnitudes of the angular momenta of the satellites as measured about the planet are LA LB and Lc Which of the following statements is correct A Question Type Single Correct Type 1 LA LB LC B 2 Lc LB LA

After molecules are broken from bonds by I atent heat the average speed of molecules i s same as molecules in bonds and they are moving so can I say that their is no differen ce between kinetic energy of a moving and stationary molecule at that movement

night un a minge is you see nearest to central fringe X Violet Yellow Red Green Solution Answer 3 First minima will occur for blue but other

A body is projected at an angle of 30 with the horizontal and with a speed of 30 ms What is the angle of velocity with the horizontal after 1 5 s g 10 ms 1 0 2 30 3 60 4 90 9 275 417 2482 g 10 m 1 0

11 A hiker stands on the edge of a cliff 490 m above the ground and throws a stone horizontally with a speed of 15 ms The vertical component of the velocity on hitting the ground is 1 79 ms 2 89 ms 11 l 490 m 15 mst 4213443149 1 79 ms 3 98 ms

speed v as shown in the figure The magnetic field at a small distance from plate is space for rough work Page 12

Two spheres A and B of radius 4 cm and 6 cm are given charges 80 C and 40 C respectively If they are connected by a conducting wire the amount of charge flowing through wire is 20 C from A to B 32 C from A to B 16 C from B to A 20 C from B to A

The vernier of a vernier scale is divided into 10 divisions which coincide with 9 divisions of the main scale each main scale division being 0 5 mm When the two jaws of the instrument are in contact with each other the 4th division of the vernier scale coincides with a main scale division and the zero of the vernier lies to the right of the zero of the main scale When a sphere is inserted between the jaws the zero of vernier scale lies slightly to the right of 1 8 cm and the sixth vernier division coincides with a main division The diameter of sphere will be A 1 85 cm B 1 81 cm C 1 75 cm D 1 71 cm

4 24 J 86 Power supplied to a particle of mass 2 kg varies 31 2 with time as P O 1 1 m s 3 2 m s 3 If velocity of particle at t 0 is v 0 the velocity of particle at time t 2 s will be watt Here t is in seconds 2 4 m s 4 2 2 m s

By inserting iron rod inductance decreases plz explain how Also provide step wise solution A light bulb and an inductor coil are connected to an ac source through a key as shown in the figure below The key is closed and after some time an iron rod is inserted into the interior of the inductor The glow of the light bulb momorro 1 decreases 2 remains unchanged 3 will fluctuate 4 increases m Asked by 1997421 aesl id Standard XII Stream NEET Aug 1 2021 at 2 10 PM

3 19 2 m 4 14 0 m The point from where a ball is projected is taken as the origin of the coordinate axes The x and y components of is displacement are given by x 6t and y 8t 5t What is the velocity of projection 1 6 ms 3 10 ms 2 8 ms 4 14 ms 15 3 19 2 m GE urid x 1 6 ms 2 10 m

An electron moves from rest from a point at which potential is 50 V to another point at which potential is 70 V Its kinetic energy in final state is 1 3 2 x 10 18 J 2 1 6 x 10 15 J 3 6 2 x 10 17 J 4 6 4 x 10 16 J 24 E Etc fa 1

At the top of the trajectory of a projectile the acceleration is 1 Maximum 3 Zero 2 Minimum 4 g 5 1 2 1 H EL 1 Her

only one is correct A pure inductor of inductance 0 7 H is connected in series with a resistance of 220 Q If an alternating emf of 440 V 50 Hz is applied to it then the wattless component of current is 2

A vessel containing water is moving with a constant speed towards right along a straight horizontal path Which of the following diagrams represents the surface of liquid 1 2 Question Type Single Correct Type 3 i ii i iii iii ii iv

A capacitor of capacitance C 1 F is charged to a potential of 100 V the charging battery is then removed and it is connected to another capacitor of capacitance C 2 F in parallel The charges on C and C in steady state are 100 c 200 O 50 C 50 C O 100 C 0 O Zero zero

When a bicycle is in motion the force of friction exerted by ground on two wheels is such that it act i In the backward direction on the front wheel and in the forward direction on the rear wheel ii In the forward direction on the front wheel and in the backward direction on rear wheel iii In the backward direction on both front and the rear wheels iv In forward direction on both front and rear Question Type Single Correct Type 1 2 iii iv 3 i ii 4 i iii ii iv

Q No 11 In the case of high precision surface plates of diameter up to 200 mm the working surface should lie between two parallel planes whose maximum distance apart is A 0 005 mm B 0 0005 mm C 0 05 mm D 0 5 mm

Figure shows a square current carrying coil of edge length L The magnetic field on the coil is given by j B Boy Box where B is a positive constant L h X If coil is free to rotate about x axis torque on the coil is given by iL Bi If coil is free to rotate about y axis torque on coil is given by L B Resultant force on coil is zero The net torque on the loop about any of its four sides has some magnitudo

When the object moves towards the co ncave lens its image shifts a towards the lens b away from the lens c towards the lens on the opposite sid e d none of these

A body starts from rest on a smooth horizontal surface under the action of a constant horizontal force F and a resistance force FR kv where k is a positive constant and v is instantaneous speed Choose the correct option as a function of time t t 0 u 0 m 0 F www F A Velocity achieved by body at time t is V L1 e v 1 e m k B Curve between velocity and time t and that between power of force F and time t are both straight line C Power of force F increase continuously and becomes constant finally after long time D Rate of change of power of force F decreases continuously and becomes zero finally after long time

Assume that the entire surface of a burning log of wood is at the same temperature Some small spots on the wood appear brighter than the rest of the surface At such a spot Question Type Single Correct Type 1 2 3 4 there is a small cavity in the wood there is a small hump convex portion in the wood less ash has formed than on the rest of the wood more ash has formed than on the rest of the wood

Xm 13 The position time x t graph for a particle of mass 2 kg moving along x axis is shown in the figure The impulse acting on the particle at 4 sis 140x2 21 8p 1000 2mu Houss LAYONG Do 1 20 N s x m 40 20 12 t s 2 20 N s 1 2x2

18 A small ball of mass m is affixed at one end of a light rod of length 1 th other end of which is hinged to a fixed pivot on a wall One end of spring of force constant k is attached on the rod at a distance d from th hinge and the other end of the spring is attached to a nail on the wal In equilibrium the rod stays horizontal and angle between the sprin and the rod is 00 If the ball is pulled slightly downwards and release the system begins to oscillate Find period of these small amplitu oscillations

8 A block of mass m starts fre spring unstretched on a rough incline Force constant of spring K 8 N m coefficient 1 of kinetic friction A The speed of 8 the block when it has slid a distance x 0 5m down the incline is N 12 mala k 37 mg N

At a point on the screen at distance D from the slits in standard YDSE experiment 3rd maxima is observed at t 0 Now screen is slowly moved with constant speed away from the slits in such a way that the centre of slits and centre of screen always lie on same line and at t 1 sec the intensity at that point is observed to be is A SD th 3 4 B of maximum intensity in between 2nd and 3rd maxima The speed of screen 13D 5 C 17D 5 D 7D 17

1 6 m 2 8 m 3 12 m 4 5 m 40 A body covers th part of a circular path Calculate the ratio of distance and displacement T N 2 T 7 2 2 2 4 None of these 41 The position of a particle moving on x axis is given by x At B Ct D The numerical

Q No 16 Plug gauges are used to A Measure the diameter of the work pieces B Measure the diameter of the holes in the work pieces C Check the diameter of the holes in the work pieces D Check the length of the holes in the work pieces

4 A body thrown upwards with some velocity reaches the maximum height of 50 m Another body with double the mass thrown up with double the inital velocity will reach a maximum height of 1 100 m 3 300 m 2 200 m 4 400 m

There exists a uniform but time varying magnetic field B a bt normal to plane of paper in a cylindrical region as shown A rectangular conducting loop is placed as shown Induced emf in branches AB and BC are 1 R b 2 0 R Question Type Single Correct Type 2 2R b 0 D

then An ant starts from origin of an x y plane and follows path given by equation y x where x and y both are in meters When it reaches the point 1m 1m it leaves the path and continues to move in the direction in which it was moving at the point 1m 1m When it crosses the line y 7m it x coordinate is

A block of mass m is attached to a fixed position O on a smooth inclined wedge of mass M The block oscillates along the incline with amplitude A and angular frequency w The wedge is located on a rough horizontal surface of friction coefficient Find the force of friction acting on the wedge if it always remains at rest 60 1 M m g Smooth mmmmmm Rough M Question Type Single Correct Type 2 mw A sin wt 4 3 M m w A sin wt p

An open pipe of length 40 cm and diameter 5 cm vibrates The wavelength of sound emitted by it in fundamental mode is 77 cm 81 5 cm Read More 86 cm

the dielectric constant for metals ia infinity reason when a charged capacitor is filled completel y with a mettalic slab its capacity becomes very large assertion wires of potential metre and metre bridge ar e made up of alloy reason

A particle is projected vertically upwards from ground with a velocity 50 m sec motion is considere till particle reaches the ground again Find the CORRECT statement s A It s distance covered in 5th sec 6th sec will be equal B For first 4 seconds distance displacement are same C Displacement in first last second of the motion are equal D Distance in first last second of the motion are equal

A water sprinkler is positioned at O on horizontal ground as shown Water sprinkler sprays water drops in every possible direction with fixed speed u This way the sprinkler is able to completely wet maximum circular area of ground as shown in diagram Now a horizontal wind starts blowing at speed of Choose CORRECT statements u 2 2 O A After the wind starts moving it will again wet a circular area of same radius u B The area which wet after wind start moving is C Centre of circle shifts by a distance of R 2 D The region which will wet after wind start is elliptical

To paint the side of a building painter normally hoists himself up by pulling on the rope A as in figure The painter and platform together weigh 200N The rope B can withstand 300N Then fabet Han Gia T I ca i faru l ch HIHIRAI TH T A 3 ti v g 3747 3774 347 30 200NB 300N A The maximum acceleration that painter can have upwards is 5m s B To hoist himself up rope B must withstand minimum 400 N force C Rope A will have a tension of 100 N when the painter is at rest D The painter must exert a force of 200 N on the rope A to go downwards slowly

State the mode different modes of heat transfer in the following situations a A paper cup full of hot soup lying on a table b Cooking vegetables in a pan c Melting of a chocolate bar in the school bag on a hot day d Cooking food in a microwave oven

In the circuit shown in figure 3 235 find charge on capacitor as a function of time t if at t 0 switch is closed 18V 552 www 192 352 4 F 302 A B

1 Massless spring of force constant K and natural L is hanging from a ceiling An insect of mass m is hanging at the lower end of the spring and the system is in equilibrium The insect starts slowly climbing up the spring so as to eat a bug sitting on the ceiling Assume that insect climbs without slipping on the spring and K mg L C When the insect is at D When the insect is at A The initial length of the spring is 2L B When the insect is at a distance L from the bug the extension in the spring is L K L Bug insect L from the bug the extension in the spring is 5L from the bug the length of the spring is

cle is taken from point A to point B a circle of radius R rizontal force constant in magnitude rtical force constant in magnitude ngential force constant in magnitude ints towards B constant in magnitu ints Towards O constant in magnite Homework Q R 3 R

A non viscous liquid of constant density 10 kg m flows in stream line motion along a vertical tube PQ of variable cross section Height of P and Q are 2m and 2 5m respectively Area of tube at Q is equal to 3 times the area of tube at P Then work done per unit volume by pressure as liquid flows from P and Q Speed of liquid at P is 3 m s Q 1 Question Type Single Correct Type 2000 J m 2 1000 J m 3 P 1500 J m 2m 2 5m

Plz explain it and also explain what will be the answer if we are asked about resistance box Will the answer vary Inyons TILULUUD 91 10 A bound wire in the form of a coil on an iron core behaves as an inductor A rheostat having similar structure has 1 only resistance but no inductance 2 both resistance and inductance 3 it offers resistance only to DC and impedance Z R to AC 4 it doesn t have iron core so no inductance Asked by 2025500 aesl id Standard XI Stream NEET Aug 1 2021 at 12 39 AM Add your responses Type Text Type your answer here OR you can upload an attachment from the option below

According to Moseley s law the ratio of the slopes of graph between Vf and Z for KB and Ka is where the symbols have their usual meaning Question Type Single Correct Type 1 2 3 32 27 27 32 33 22

When a rectangular box is going down a smooth inclined plane with initial velocity v a person standing on the rectangular box throws up a ball perpendicular to the inclined plane with velocity u with respect to himself as shown in the figure Which of the following is are true about the ball coming back to incline A It will fall behind the person B It will fall ahead of the person U return on the box is 0 C It will come back into the hands of person D Neglecting the height of point of projection above box total time taken by the ball to 2u g cos

The applied potential difference in the circuit shown is V 10 sin 100t where Vis in volt and t is in second If the power factor of the circuit is then the value of capacitance C of the 1 2 circuit nearly is 2002 www V 10 sin100t O 111 UF O 333 UF 0 1 H rooooo O 222 IIF C HI

24 What is the unit vector perpendicular to t following vectors 21 2j k and 61 33 2 101 18k 5 17 1 101 18k 5 17 2 E i 10 18k 5 17 i 10 18k 5 17

32 The equations of displacement of two waves are UP CPMT 2012 d 5 y 10 sin 3nt R 3 y2 5 sin3 t 3 cos3nt What is the ratio of their amplitude UP CPMT 2012 and b 2 1 a 1 2 d None of these simple pendulum is taken to a place where g 2 9 c 1 1

Question Although I got correct answer by using the method shown in attachment But I am not sure whether the method is c orrect or not Can we write T1 T2 in terms of Q1 Q2 Si nce there ratio is equal but individually they are not equal that s why I am asking Please check whether this method is correct or not 9 9 The temperature inside a refrigerator is t C and the room temperature is t C The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be NEET Phase 2 2016 1 3 t 1 1 t 273 t 1 93 W Js J Type Text 2 Add your responses 4 It Tg 7 272 273 t t2 t t 273 2 273 1 273 273 273 6 273 273 42 Asked by 2525299 aesl id Standard XI Stream NEET Aug 1 2021 at 11 45 AM T 273 T 273