Physics Questions

Consider N coherent sources described as follows E Eosin wt b E Eosin wt 24 E3 Eosin wt 36 EN Eo sin wt No Find the minimum value of for which ER E1 E2 E3 Ey is zero 3

86 Units and Measurements 18 The frequency of vibrations f of a mass m suspended from a spring of spring constant K is given by a relation of type f cm K where c is a dimensionless constant The values of x and y are 1

A P V diagram for a thermodynamic process is shown in the figure If T TB then choose the correct option during the process PA 3Po Po V 0 B 2Vo Temperature continuously increases Temperature continuously decreases Temperature first increases then decreases

India s Superlatives Match the following and mark in the box given below A B 1 Longest River 2 Longest Road 3 Fastest Train 4 Smallest State 5 Largest Residence of the head of India 6 Most Populous City 7 Largest Desert 8 Highest Mountain Peak a National Highway 44 b Kanchenjunga c Ganga also Ganges d Vande Bharat Express e Goa f Rashtrapati Bhawan g Mumbai h Thar

SolveLancer Test A particle of mass m moves with a variable acceleration a which changes with distance covered x along a straight line as a k x where k is positive constant The velocity of the particle will be Consider the particle initially at rest SolveLancer Te a v b v c v d v 4k 3 x3 4k 11 3 3 x 2k 3 x3 2 x

questions Each question has 4 choices 1 2 3 and 4 out of which only one is correct A particle is thrown vertically up with velocity 10 m s from a point P which is 10 m above the ground Time after which particle reaches the ground g 10 m s 10 m s

The distance travelled by a particle is directly proportional to where this time elapsed Which of the following is correct regarding the motion of the particle Particle is moving with increasing acceleration Particle is moving with decreasing acceleration Particle is moving with decreasing retardation

minimum angle of deviation is also A then in terms of refractive index mothongo mathoriga mothonga mathongo mathonnomathango 1 2 cos 9 2 sin mathongs mathango mathongemathongo mathongo mathongozion mathongo Math Bole Toh MathonGo www mathongo com mathongo mothongo mathango

A parallel plate capacitor A of capacitance 1 F is charged to a potential drop 100 volt and then disconnected from the battery Now the capacitor A is completely filled with a dielectric slab of dielectric constant k 4 Another parallel plate capacitor B of capacitance 2 F is charged to a potential drop 20 volt and then disconnected from the battery Now the two capacitors A and B are connected with each other with opposite polarities Then the heat dissipated after connecting the capacitors is A 1 15 10 J C 1 35 10 J B 1 25x10 J D 1 45 10 J

A time varying magnetic field B Kr t is existing in a cylindrical region of radius R as shown where k is a constant The induced electric field E at R is 2 A C KR 20 KR4 60 B D KR 40 KR4 80 B kr t

A thin film of oil n 1 25 is located on a smooth wet pavement When viewed perpendicular to the pavement the film reflects most strongly red light at 640 nm and reflects no blue light at 512 nm How thick is the oil film

Displacement of a truck moving along x axis is given by x at t 7 where tis time and a and 7 are positive constants Velocity of truck when its acceleration is zero will be O B 3y O a E Oa 28

A beam of light in air hits a stack of three slides with thicknesses of 2d d and d and refractive indexes of 2n n and n respectively at an incident angle of 600 as seen in the figure O 30 O None of these 90 2d O 60 O 120 d 60 d What is the angle 0 when the light exits the stack 8 no 2n n n no

An object of height 5 cms is placed in front of a concave mirror of focal Length 15 cms at a distance of 10 cms Find the image distance image Height and the nature of the image 2

A periodic voltage V varies with time t as shown in the figure T is the time period The r m s value of the voltage is V V T 4 T t Question Type Single Correct Type

4 The potential energy u of a particle varies with A x X B distance x from a fixed origin as where A and B are constants The dimensions of A and B are respectively 1 ML52T L 2 MLT 2 L 3 L ML 2 T 2

A possible means for making an airplane invisible to radar is to coat the plane with an antireflective polymer If radar waves have a wavelength of 3 00 cm and the index of refraction of the polymer is n 1 50 how thick would you make the coating

Monkey A 10 kg is climbing on a pole while B 5 Kg is holding on to the tail of monkey A If monkey A is climbing with acceleration 1 m s and its tail can withstand tension of 65 N before it snaps with what maximum relative acceleration in m s with respect to monkey A monkey B climb on its tail A 10 kg B 5 kg

An oil film n 1 45 floating on water is illuminated by white light at normal incidence The film is 280 nm thick Find a the color of the light in the visible spectrum most trongly reflected and b the color of the light in the pectrum most strongly transmitted Explain your reasoning

Interference effects are produced at point P on a screen as a result of direct rays from a 500 nm source and reflected rays from the mirror as shown in Figure P37 52 Assume the source is 100 m to the left of the screen and 1 00 cm above the mirror Find the distance y to the first dark band above the mirror Source Mirror Viewing screen P

In a bicycle the radius of rear wheel is twice the radius of front wheel If rF and r are the radius VF and V are speeds of top most points of wheel then A Vr 2VF C VF VI B VF 2Vr D VF Vr

Q31 In Young s double slit experiment distance between two sources is 0 1 mm The distance of screen from the sources is 20 cm Wavelength of light used is 5460 Then angular position of the first dark fringe is 1 0 08 2 0 16 3 0 20 4 0 32 1 2 3 From NCERT 4

Two glass plates 10 0 cm long are in contact at one end and separated at the other end by a thread 0 0500 mm in diameter Fig P37 39 Light containing the two wavelengths 400 nm and 600 nm is incident perpendicu larly and viewed by reflection At what distance from the contact point is the next dark fringe

A material having an index of refraction of 1 30 is used as an antireflective coating on a piece of glass n 1 50 What should be the minimum thickness of this film in order to minimize reflection of 500 nm light

A body of mass M and moving with velocity u makes a head on elastic collision with another stationary body of m If A m M then the ratio f of the loss of energy of M to its initial energy will be O f A A 1 O A A 1 f 0 1 UA A 1 4A A 1 Marks 4 1

A beam of 580 nm light passes through two closely spaced glass plates as shown in Figure P37 37 For what minimum nonzero value of the plate separation d is the transmitted light bright I

Pure Si at 500 K has equal number of electron n and hole n concentrations of 1 5 10 6 m Doping by indium increases n to 4 5 10 m The doped semiconductor is of h 1 p type having electron concentration n 5 x 10 m e 2 n type with electron concentration n 5 x 1022 m e 3 p type with electron concentration n 2 5 x 10 0 m e 4 n type with electron concentration 25 x 1023 m 3 n

The position vector of a particle R as a function of time is given by 7 R 4 sin 2nt 4 cos 2nt j where R is in metre t is in seconds and i and denote unit vectors along x and y directions respectively Which one of the following statements is wrong for the motion of particle a Acceleration is along R b Magnitude of acceleration vector is v R where v is the velocity of particle e Magnitude of the velocity of particle is 8 m s Both of the particle is a circle of radius 4 m

1 04 A ship A is moving Westwards with a speed of 10 km h and a ship B 100 km South of A is moving Northwards with a speed of 10 km h The time after which the distance between them becomes shortest is a 0 h b 5h c 5 2h d 10 2 h

Two narrow parallel slits separated by 0 850 mm are illumi nated by 600 nm light and the viewing screen is 2 80 m away from the slits a What is the phase difference between the two interfering waves on a screen at a point 2 50 mm from the central bright fringe b What is the ratio of the intensity at this point to the intensity at the center of a bright fringe

When a liquid is introduced into the air space between the lens and the plate in a Newton s rings apparatus the diameter of the tenth ring changes from 1 50 to 1 31 cm Find the index of refraction of the liquid

A wave function expressing the displacement a as a function of position and time t is given as Pe QB Rt which of the following expression has dimension different from other A aR B PR C D QR

A rigid body is rolling without slipping on the horizontal surface A 2 3 60 A 00 Column I Velocity at point A i e VA 1 Velocity at point Bie VB 2 Velocity at point Cie VC 3 Velocity at point D i e VD 2 1 B 1 EVE B B C 4 D B T Column II VV2 Zero V 2V

Find the work done when a 25 kg weight is i lifted to JUE a vertical height of 2 0 m from the ground ii carried ELE TH to the same place by pushing it up an inclined plane W making an angle of 30 with the ground Take g 9 8 m s 71 2 Sjaa Ans i 490 J ii 490 J 7

5 In the diagram A and B are two conductors on insulating stands Both A and B were initially uncharged A X Y B i a Conductor A is given the positive charge shown on the diagram i On a copy of the diagram mark the signs of the charges induced at end X and at end Y of conductor B 1 ii Explain how these charges are induced 3 iii Explain why the charges at X and at Y are equal in magnitude 1 b B is now connected to earth by a length of wire Explain what happens if anything to i the charge at X ii the charge at Y 1 2

A bus is moving on a straight road toward North with a uniform speed of 50 km h If the speed remains unchanged after turning through 90 the increase in the velocity of bus in the turning process is a 70 7 km h along South West direction b zero c 50 km h along West Lako 7 km h along North West direction

A bob is circulating in horizontal plane whose radius is constant with the help of ideal str that it forms a conical pendulum Then choose the correct option s Answer A B C Your Attempt Correct answer Angular velocity of the string is constant Magnitude of angular velocity of the string is constant Direction of angular velocity of the string is varying ular velocity are varying Rate this qu

The speed of a boat is 5 km h in still wate It crosses a river of width 1 0 km along the shortest possible path in 15 min The velocity of the river water is in km h 201 d 4 a 5 L c 3

5 An insulated cylinder covered by a weighted frictionless piston of 500 kg and an area of 100 cm contains air at 1 MPa and 300 C The piston is held in position by a stop The environment is air at 100 kPa and 30 C The stop is removed and the piston rises to a new equilibrium position 50 cm higher a Find final pressure of air b Find initial and final volume of air C Calculate the mass of air 50 cm

Time period of a particle executing SHM is 8 sec At t 0 it is at the mean position The ratio of the distance covered by the particle in the 1st second to the 2nd second is Type Nu perical T

4 X 1 English A Stretched wire of length 110 cm is divided into three segments whose frequencies are in ratio 1 2 3 Their length must be Question Type Single Correct Type 2 3 120 cm 30 cm 60 cm 60 cm 30 cm 20 cm 60 cm 20 cm 30 cm Review 4 30 cm 60 cm 20 cm

Shown in the figure are the displacement time graph for two children going home from the school Which of the following statements about their relative motion is true after both of them started moving X C C T Their relative velocity A first increases and then decreases B first decreases and then increases C is zero D is non zero constant

An electric dipole consisting of two opposite charge of 2 x 10 6 C each separated by a distance of 3 cm is placed in an electric field of 2 x 105 N C The maximum torque on the dipole will be Question Type Single Correct Type 1 12 10 Nm 2 12 x 10 N m 3 24 10 N m

6 Two particles of equal mass m go round a circle of radius R under the action of their mutual gravitational attraction The speed of each particle is 4Gm b v d v R a v Gm VR Gm c v 1 Gm 2 R 2 R tunnel is dug along a straight line

A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm What is the area of the surface of water through which light from the bulb can emerge out Refractive index of water is 1 33 Consider the bulb to be a point source

SolveLancer Test Calculate the mutual inductance of a straight solenoid which has 100 turns per cm in primary and total 700 turns in the secondary The cross sectional area of the solenoid is 8 cm Given Primary is tightly kept inside the secondary SolveLancer Test a 5 14 mH b 12 71 mH c d a O b 7 04 mH 5 0 mH

The potential difference between points A and B is A 2V 192 1 4V 192 Question Type Single Correct Type 2 V 3V 19 B 2 6 V

Find the potential difference across the capacitor in volts R R R 10V R C R

1 A log of wood floats in water with of its volume above the surface What is the density of wood A 750 gm cc 750 kg m 250 gm cc 250 kg m

In Young s double slit experiment with slit separation 0 1 mm one observes a bright fringe at angle 1 40 rad by using the light of wavelength 2 When the light of wavelength 22 is used a bright fringe is seen at the same angle in the same setup Given that 1 and 2 are in the visible range 380 nm to 740 nm their values are A 400 nm 500 nm B 625 nm 500 nm C 380 nm 525 nm D 380 nm 500 nm