Basic Physics Questions and Answers

Figure shows a small particle in a box which bounces back and forth at constant speed The reflections of particle from th wall creates a standing wave analogous to standing wave on a string tied at both ends Since a standing wave confined to region can have only selected wavelengths momentum of the particle is quantized We can safely assume that such particle only has kinetic energy This energy must also be quantized The momentum of particle in nth mode of standing wave is nh 2L Particle s energy in nth state is h n 8mL2 Matter wave in this case will be electromagnetic in nature None of these m L V 4

The missile at A takes off from rest and rises vertivally to B where its fuel runs out in 8 sec If the acceleration varies with time as shown determine the missile s height he and speed VB If by internal controls the missile is then suddenly pointed 45 as shown and allowed to travel in free flight determine the maximum height attained hc and the range R to where it crashes at D 0 VB is equal to 160 m s 0 1280 3 Ohc is equal to 900 m he is equal to m R is equal to 3000 m approx VB C 45 B he A he R A D a m s 40 8 t s

3 Ray will be totally transmitted into medium ll only if angle of incidence is increased 4 Ray will be totally transmitted in medium 1 31 The plane faces of two identical plano convex lenses each 31 having focal length of 40 cm are placed against each other to form a common convex lens The distance from this lens at which an object must be placed to obtain a real inverted image with magnification equal to unity is 1 80 cm 2 40 cm 3 20 cm 4 160 cm 3 F a fram a 4 fata 40 cm at K TEH TE FAA n zaman i faig un any man ang at para mafire an entform for fun 1 80 cm 2 40 cm 3 20 cm 4 160 cm

22 Two similar coaxial circular loops carry equal current in the same direction On moving loops further apart the electric current will 1 Increase in both 2 decrease in both 3 remain unaltered 4 Increase in one and decrease in second

marks A particle moves in a circle of radius R with a constant speed v Then during a time interval which of the following is true 0 0 a v a 3v TR 3v 75 2v TR TR 3v 3v

15 What is the net force on given square coil a b 25 X N towards left 25 X N towards right 35 X N towards left 35 X N towards right c d 2 A 1 A 2 cm 10 cm 15 cm

4 Two small iron particles each of mass 280 mg are placed at a distance 10 cm apart If 0 01 of the electrons of one particle are transferred to the other find the electric force between them Atomic weight of iron is 56 g mol and there are 26 electrons in each atom of iron

A system having initial state at t 0 is given by y x 0 5 and are three orthonormal state vectors The probability corresponding to state is a c d 3 10 q C 2 Here 2

Another Consider the cases i An initiallly uncharged capacitor is charged by a battery of emf V ii identical capacitor is charged by a battery of emf V 2 first and then it is connected with the positive plate connected to the positive terminal to a battery of emf V

Q4 Fill in the blanks with Only One Word to make meaningful and correctly structured sentences Answer Only 9 of the following 1 He picked the blue colour you feeling sick 3 When we were in the restaurant I saw something on the ground What that 4 He had finished his work he went home 5 What he like 2 night 6 David is an electrical engineer He is skilled and 7 I do have what you need 8 The magazine being printed 9 I do not feel well tonight I am going home 10 I was to find the car keys when she left

List 1 1 1 kWh 2 Voltage 3 Heat produced in a conductor 4 Charge on one electron Answer 1 2 A A List 2 B B A IR B 3 6 MJ C 1 6 x 10 19 C D Q i Rt C C

4 The vector potential A due to a magnetic moment m at a point r is given by A If m is directed along the positive z axis then find a x component of B b y component of B mxr c z component of B

4 ITT If force F acceleration A and time T are ITT Find the dimensions of energy 2 chosen as the fundamental physical quantities E MOT F 4 1 1 2 3 TAXAY F A T x F A T X F A T T 2 Ox F A T X 2 MLT M

Q18 An object weights m in a liquid of density d and that in liquid of density d is m The density of the object is a b c d m d m d M M m d m d m2 M m d m d m m m d m d M M

Write the answers to the follo X Establish the relation between dyne and 2 A neutral atom has 2 electrons in its K shell 8 electrons in shell Find the atomic number of the element Write the s syn the electrons in the M shell are removed from the atom 3 How will you estimate the apparent volume of a drop 4 Mention the shortcomings of Rutherford s model of 5 A toy car was moving with a speed of 20 cm s lis distance of Im Calculate the acceleration of the ca

Binding Energy per nucleon of a fixed nucleus XA is 6 MeV It absorbs a neutron moving with KE 2 MeV and converts into Y at ground state emitting a photon of energy 1 MeV The Binding Energy per nucleon of Y in MeV is 6A 1 6A 1 A 1 A 1 C 7 7 6

29 The magnetic field in a region is given by B Boy where L is a fixed length A conducting rod of length L lies along the Y axis between the origin and the point 0 L 0 If the rod moves with a velocity v vi find the emf induced between the ends of the rod B Bovol A 2BovoL C Bovol 2 D none of these

4 Zero 4 8 A body is projected vertically upward with speed 28 40 m s Velocity of the body at half of its maximum height 1 20 m s 2 20 2 m s 3 30 m s 4 30 2 m s 40 m s funds and 1 20 m s 3 30 m s at site that and for 2 20 2 m s 4 30 2 m s

A wire of length 1 tapers uniformly from end P to end Q with the diameter at P twice that at Q A potential difference is applied across the ends of the wire Which graph represents the variation of the drift velocity V of the conduction electrons with distance x P O X 0 VA DQ x l l x axis X

Two SHOs x a sinct and y a sin wt 27 acting on a particle in two mutually perpendicular directionsthe trajectory will be O Straight line with negative slope O Straight line with positive slope O A circle describing clockwise direction A circle describing anti clockwise direction

7 Starting from rest a 5kg object is acted upon by only one force as shown in figure Find the total work done by t force If your answer is aJ then find a 15 F N 20 10 0 10 2 3 t s

78 Two point charges of 1 C and 1 C are separated by a distance of 100 A point P is at a distance of 10 cm from the midpoint and on the perpendicular bisector of the line joining the two charges The electric field at p will be a 9 NC 1 c 90 NC b d 0 9 NC 0 09 NC 1

Six parallel infinite wires are placed at the vertices of a regular hexagon Five wires carry current lo each while the sixth wire carries current 4 as shown The resultant magnetic field at the centre of the hexagon is Q 1 410 9 olo 2ra O lo 0 a 2 0 54 do 2

Vsound 330 m s When sound waves are travelling from one medium to another medium it is observed that amplitude is increased by 50 Calculate the percentage change in intensity here an echo from a reflecting surface after 3 s How much distance he

An infinite long line charge of charge per unit length is passing through one the edge of a cube Length of edge of the cube is l Total flux linked with l M B cube is 480 280 D ABFE is zero A cube is C BCGF is ne 860 A H D TI B

10 The potential energy of a particle is determined by the expression U a x y2 where a is a positive constant The particle begins to move from a point with the co ordinates 3 3 only under the action of potential fields force When it reaches the point 1 1 its kinetic energy is 4Ka Find the value of K

Which of the following statement is true for passive transducer Simple design Low resolution Output obtains by receiving the signal from the external power source Draw energy from the measurand source

d Both move on straight line path 25 Sensitivity of a moving coil galvanometer can not be increased by a Increasing the number of turn b Decreasing restoring couple per unit angle of the suspending wire c Increasing current in the coil d Increasing the area of the coil

of the waves You hear thunder 3 0 s after you see a lightning Later you hear thunder 2 5 s after you see a flash If the sound travels at 340 m s how much closer was the second lightning strike than the first one

3 Two bodies A and B are moving towards a plane mirror B with speeds V and V respectively as shown in the figure The speed of image of A with respect to the body B is A u O image VA i VA i ge VA VA Body VB VB a V VB A C V V m m VA B 0 0 VB Normal b IVA Vgl d V V B VAL VAI VBi VA iti VB

thin glass equiconvex lens separates two media as indicated in diagram When an object is laced in air at distance of 10 cm from the lens a real image is formed at a distance of 12 cm rom the lens If an object is placed in water at distance of 15 cm from the lens the real image s formed at distance of 90 cm from lens Find the value of n H n 4 air Object Water Hwater 3

Alternating C Noms 7 13 The line that draws power supply to your house from street has Laj 2 zero average current b 220 V average voltage e c voltage and current out of phase by 90 X d voltage and current possibly differing in phase such that T

9 A block of mass m is connected to a massless pulley and mass less spring of stiffness k The pulley is frictionless The string is mass less Initially the spring is unstretched when the block is released When the spring is maximum stretched find the ratio of tension in the rope and weight of the block k elle m

36 A particle performs SHM in a straight line In the first second starting from rest it travels a distance a and in the next second it travels a distance b in the same side of mean position The amplitude of the SHM is a a b 2q 3a b c b 2a b 3 d None of these al

Before connecting a FET in a circuit Its source and drain terminals are interchangeable Its drain terminal is marked Its source and drain terminals are not interchangeable Its gate terminal is marked

SolveLancer Test A gas compressed adiabatically curve 1 and isothermally curve 2 from volume V to V If the gas has y work done in adiabatic process is 7 5 SolveLancer Test P V 2 V V a More than that in isothermal process b Less than that in isothermal process c Equal to that in isothermal process

Column I A If swimmer can swim at 5m sec in still water and if velocity of water flow is 4m sec then angle between direction of swimming and direction of river flow to minimize drift B If swimmer can swim at 5m sec in still water and velocity of flow is 3m sec then angle between direction of velocity of swimmer with respect to river and the direction of river flow if swimmer crosses the river in minimum time C If swimmer can swim at 4 m sec and velocity of flow is 3m sec then angle of resultant velocity w r t ground with the direction of river flow if swimmer heads perpendicular to flow of river P Angle between direction of fluttering of flag and north if wind blows towards south west direction with a velocity 3 2 m sec Man moves with a velocity 7m sec along west holding flag in his hand P 53 Q 127 R 143 S 90

3 Calculate the contact force acting on the mass placed over the inclined plane of friction co efficient 0 5 as shown if nysind 1 mg 3 Zero m 370 mgrose 2 mg 2 5 4 mg

p 4 A charged particle travels along a straight line with a speed in a region where both electric field E and magnetic field are present It follows that a E B and the two fields are perpendicular b E v B and the two fields are perpendicular c B vE and the two fields are parallel two fields are perpendicular FI

The intensity distribution of X rays from two coolidge tubes operated on different voltages v and V and using different target materials of atomic numbers Z and Z2 is shown in the figure Which one of the following inequalities is true V x I 1 Mr Ma 2 1 V V2 Z Z 2 V V2 Z Z 3 V V2 Z Z AY V 16 7 7 21 I 1 x 2

In all numericals questions of non uniform motion are in type of non equal distances in non equal intervals of time then why definiti on of non uniform motion is non equal dista nces in equal intervals of time instead of no n equal intervals of time For example An object travels 8m in 4 seco nds and then 15m in 2 seconds What is the average speed of the object Here it is a question of non uniform motion i n which an object is covering non equal dist ances in non equal intervals of time but acc ording to the definition of non uniform moti on that object should cover non equal dista Explain it

SolveLancer Test The time period of an electron in nth orbit in a hydrogen atom is T Find the time period T when the electron is in n 1 th orbit SolveLancer Test 3 n 1 a T n 3 b T n T n c n 1 d None of these

configuration I or in configuration II as shown in the figure One of the blocks has thermal conductivity K and the other 2K The temperature difference between the ends along the X axis is the same in both the configurations It takes 9s to transport a certain amount of heat from the hot end to the cold end in the configuration I The time to transport the same amount of heat in the configuration II is A B 00 C A K 2 K 2 0 s 3 0 s Configuration I 4 5 S Configuration II 2 K K X

SolveLancer Test Density of an imaginary solid sphere varies with the distance from center as p r ar What is the moment of Inertia of the sphere about its diameter if radius is R SolveLancer Test a aR6 b R6 18 c aR6 d R6

Among the following models which one s can be fitted to a data set by least squares using the method of normal equations Notes The model parameters are the coefficients a No further manipulation e g change of variable or model linearisation etc is done to the models Select one or more a yao a e b y a A a sin x c y a a x a x a x d ya sin x a a x cos ar ar a Q I 1 z

SolveLancer Test A cylindrical vessel of 5 L consists of 2 g of hydrogen 8 g of oxygen and 11 g of carbon dioxide gas The mixture is at 27 C Find the pressure in the vessel in Nm SolveLancer Test a 5 x 105 b 7 47 x 105 c 4 x 105 d 6 47 x 105

no se 8 The power supplied by a force acting on a particle moving in a straight line is constant The velocity of the partic 1 varies with displacement as xK Find the value of K

over a above the rest With ck hit the 4 A force of F 0 5 N is applied on lower block as shown in figure The work done by lower block on upper block for a displacement of 6m of the upper block with respect to ground is in J Take g 10m s W 0 1 1 kg 2 kg Smooth F

A block of mass m 2 kg is placed on a rough horizontal surface and is being acted upon by a time dependant force F N 2t where t is in second The coefficient of static friction between the block and the horizontal surface is 0 20 The frictional force f developed between the block and the surface versus force F N plot is as shown 2 kg 1 2 5 m s 101 f N F N 2t 1 N N F N The velocity of the block at t 4s will be 2 5 m s www

Vd Only a capacitor 1 7 10 Electrical energy is transmitted over large distances at alternating voltages Which of the following statements is correct I want deal solution Not copied from internet as a For a given power level there is a lower current I have b Lower current implies less power loss c Transmission lines can be made thinner already gone LIET It is easy to reduce the voltage at the receiving end using step down transformers there 711 For an ICR circuit the power tromafom