Physics Questions

The relative density of a metal by hanging a block of the metal from a spring balance and noting that in air the balance read 5 0 05 N while in water it reac 4 0 05 N The relative density would quoted as 1 5 0 05 2 5 11 4 5 6

Al Arrangement of three metallic rods riveted to each other is as shown in figure a is the coefficient of linear expansion for aluminum and a when a ag for steel The arrangement is heated then Al Steel AI Steel 52 1 Tensile stress is developed in the aluminum rod 2 Compressive stress is developed in the aluminum rod 3 No stress is developed in the aluminum rod 4 Data s are incomplete to decide

In a container air is filled and maintained at temperature To Inner surface of walls of the container is maintained at temperature T At different values of temperatures T that are less than equal to and greater than To pressure exerted by the air on the container walls are P P2 and P3 respectively Which of the following statements is correct a P P P3 c P P P3 b P P P3 d P P P3 A piston can slide without friction inside a horizontal cylindrical vessel which contains an idool mot mi

A wire elongates by mm when a load W is 5 hanged from it If the wire goes over a pulley and two weights W each are hung at the two ends the elongation of the wire will be in mm 1 l 2 20 3 zero 4 1 2

4 Becomes zero Water is flowing through a long horizontal 3 tube Let P and P be the pressure at two point A and B of the tube then 1 P must be equal to P 2 P must be greater than P 65 P must be less than P 4 P P only if cross sectional area at A an

Find the right condition s for Fraunhoffer diffraction due to a single slit Multiple correct WB PMT 2015 Your Answer PARTIALLY CORRECT X Source is at infinite distance and the incident beam has converged at the slit Source is near to the slit B and the incident beam is parallel ATTEMPTED Source is near to the slit ATTEMPTED Source is at infinity and the incident beam is parallel

A string of a material of length 1 m cross sectional area 0 2 cm requires 2000 N to extend it by 1 mm The same material is used to manufacture the legs of a robot of 50 cm length and of cross sectional area 0 5 cm each The mass of the robot is 50 kg When it jumps from a building of height h it experiences a strain 0 05 The maximum height through which the robot can jump without breaking its legs is g 10 ms 2 1 m 0 2 cm s progone in sargo 1 mm ad agos as d aus od 5 o Options 1 do 60 a sprego 0 5 cm og 50 kg a 553 0 05 3580 Dood de se ono drsne 3 12 5 m 2 2 5 m 10 m 2000 Ne5550 50 cm hegne 45502 5008 og Joh g 10 ms 4 7 5 m

A ball is Pwater P Poil with Poil and Pwater representing the densities of oil and water respectively The oil and water are immiscible If the above ball is in equilibrium in a mixture of this oil and water which of the following pictures represents its equilibrium position oil 1 water 3 oil water 2 water 4 oil water Foil

A ball of m 1kg is connected from a spring of force constant 225 N m and another ball of mass 3m is hanging from it with the help of thread The system is in equilibrium now the thread is burned The maximum speed of mass m during the subsequent motion is vo Write the value of vo in OMR sheet EN

SolveLancer Test Consider Colour Code for Carbon Resistors with bands A B C D B D Case i A Green B Violet C Orange and D Silver Case ii A Yellow B Red C Orange and D No colour The value of R and R is given by SolveLancer Test R x y and Ri P Q where x y and P Q are a 52500 10 40000 5 b 57000 10 42000 20 c 37000 5 42000 10 d 29676 10 49000 20

Consider a parallel plate capacitor having an E inside it as shown in the adjacent figure A particle of mass m and charge q is hanging inside the capacito through a light inextensible string of length The time period of this pendulum for small oscillations is a T 2n b T 2 c T 2n 1 g qE m 8 T 9 E 29gE m d none of these xx 1 q E 2qgE m m

10 If one of the i p of studied comparator is connected to 1Vdc other i p voltage is varied around this 1Vdc continuously Then the o p waveform of comparator is 2 Points sine wave Traingle wave Square wave can not predict

Sir please explain this question also explain how to u nderstand such graphs and sorry sir there s one more opti on but I couldn t capture that So pls don t reject nd kindly answer accordingly Two long parallel wires at a distance 2d apart they carry equal current flowing out of the plane of paper as shown in figure The variation of magnetic field along the line xx is given by X

A cavity of the radius R 2 is made inside a solid sphere of radius R The centre of the cavity is located at a distance R 2 from the centre of the sphere The gravitational force on a particle of mass m at a distance R 2 from the centre of the sphere on the line joining both the centres of sphere and cavity is opposite to the centre of the cavity Here g where M is the mass of the sphere GM R A mg 2 B 3 mg 8 Correct Answer mg 16

Two forces of same magnitude act on an isolated body in opposite directions to keep it at equilibrium position is this true according to Newton s third law

Why will we apply F TL not F T2L As there will be film fo mation and film has 2 layers so we should use 2L but an wer is coming after using L Pls help 13 2 035 10 14 6 Calculate the force required to take away a flat plate of radius 5 cm from the surface of water Given surface tension of water 72 dyne cm Ane 200

An ice cube is suspended in vaccum in a gravity 37 free hall As ice melt it 1 Will retain its cubical shape 2 Will change its shape to spherical 3 Will fall down on the floor of the hall 4 will fly up bigge

When light passing through rotating nicol is observed no change in intensity is seen What inference can be drawn Your Answer INCORRECT B The incident light is unpolarized The incident light is circularly polarized FIRST ATTEMPT The incident light is cunpolarized or circularly polarized The incident light is SECOND ATTEMPT

Density of viscous fluid only For an aerofoil which of the following statement s is are correct 1 The orientation of the wings relative to flow direction causes the streamline II Flow speed on top is lower than that below it III Upward force resulting in dynamic lift of the wings 1 Only I 2 Only III

E OF FORCES NEWTON S THIRD LAW FREE BODY DIAGRAM An object of 5 kg is far away from the surface of the earth and has an acceleration of 6 m s towards t center of earth Find the force exerted by the object on the earth

1 Gaseous helium filled in a horizontal fixed cylindrical ves separated from its surroundings by a piston of finite mass whic move without friction Inner surface of the vessel as well as of the are coated with a perfectly heat insulating material The ex pressure is increased rapidly to triple of its initial value w changing the ambient temperature How many times of its initial will the volume of helium become when the piston finally stops a b 3 5 3 5 3 5 7 1 3

Detailed mai samajha dijiye sir A cell is connected between the points A and C of a circular conductor ABCD of same material with centre at O If B and B are the magnitude of magnetic field at O due to current in ABC and ADC respectively then ratio is B B 05 02 1 B 60

V3 V is the frequency of series limit of Lyman series v is the frequency of the first line of Lyman series and v3 is the frequency of the series limit of Balmer series then O V V V3 V V V3 1 V V 1 1 V V3 V 1 1 V

The three vessel shown in figure have same base area Equal volumes of a liquid are poured in the three vessel The force on the base will be VUU B A C 1 Maximum in vessel A 2 Maximum in vessel B 3 Maximum in vessel C 4 Equal in all the vessels

a 1 0 H coil Ans 159 24 112 16 A coil has an inductance of 1 H At what frequency will it have a reactance of 3140 What capacitance will have the same reactance at that frequency 7 Ans 500 Hz about 1 x 10 F ad to a series

The stopping potential is 4V when wavelength of incident monochromatic radiation is X If wavelength of incident radiation is doubled on same photosensitive material the stopping potential becomes V The threshold wavelength of the photosensitive material is Only one correct answer B i

Q10 Two plane mirrors intersect at right angles as shown in figure A light ray incident on first mirror at a point 12 cm from their point of intersection The angle of incidence at first mirror for which the light ray strikes the midpoint Marks 3 0 of second mirror is O A 90 O B 30 O c 45 O D 60 12 00 cm 24 00 cm

The pressure in a liquid at two points in the same horizontal plane are equal Consider an elevator accelerating upward and a ca accelerating on a horizontal road then the abo statement is correct for 1 The car only 2 The elevator only 3 Both of them 4 Neither of them levator aco

When a transparent sheet of thickness t and refractive index u is introduced in one of the paths in YDSE having slit width d and distance between slit and screen is D then the fringe pattern shifts by Only one correct answer A 1 t B C d D 1 t 2 1 t 11

The terminal velocity of an object in a viscous fluid is proportional to 1 Sum of densities of both object and fluid 2 Difference of densities of both object and fluid 3 Density of object only 4 Density of viscous fluid only 24

between the pistons becomes 60 cm 16 Two rubber balloons filled with the same ideal gas when held at the bottom of a lake in thermal equilibrium with the surrounding water occupy equal volumes Rubber of the first balloon is a good conductor of heat while that of the second balloon is a good insulator of heat Both the balloons are set free simultaneously If temperature of water in the lake is uniform which balloon will occupy more volume when it comes near surface of the lake a The first balloon b The second balloon c Both the balloons will occupy equal volumes d Decision depends on the adiabatic exponent of the gas One mole of a mono atomin

Cross a 230 V supply terminals in a house an electric iron having a resistance of 500 and incandescent lamp of resistances 450 d 800 respectively are connected For this operation exhibit the total current involved and also find the power taken from the pply mains

Q15 Tension is maintained in a string as in figure The observed wave speed in string is v 24 m s when suspended mass is m 3 kg The mass per unit length of string is O A 0 026 kg m O B 0 051 kg m O c 0 102 kg m D D 0 72 kg m

A sports car moves along a straight road with constant acceleration It has an initial velocity y and after traveling a distance of 800 m in 25 s its velocity becomes v 20 m s What is the car s acceleration during this covered distance a b C d e 0 96 m s 1 12 m s 1 28 m s 1 44 m s 1 60 m s 800 m

X 3 Z y B A 25 A student in an experimental study of a process 1 2 3 on an ideal gas prepares two graphs to show relations between absolute temperature T pressure P and volume V Later he found that he has forgotten to specify a coordinate axis in each graph and marking states in the second graph Unspecified coordinates are shown by letters A and B and unspecified states by letters x y and z in the second graph Which of the following combinations best suits these graphs a A P B b A P B T x 1 y 2 z 3 T x 3 y 2 z 1 c A T B V x 3 y 2 z 1 d A T B T x 1 y 2 z 3 Questions 26 and 27 are based on the following physingl Two heat cond 1

Sir why the solution given in the book is a b c d since ther e is a force Ncostheta on wedge which will produce an acc eleration in the wedge since no 9 Wedge shown in the figure is fixed Syner force is acting on it is released from rest Neglect friction 1 Acceleration of block is M msine g M m Mgm 1 sin M m 2 Tension in the spring is 3 Net force on pulley is zero 4 Net force on wedge is zero M

Equal masses of three liquids are kept in three 30 identical cylindrical vessels A B and C The densities are PA PB Pc respectively where PA PB PC then the force on the base will be 1 Maximum in vessel A 2 Maximum in vessel B 3 Maximum in vessel C 4 Fqual in all the vessels

If the streams of protons closely move parallel to each other in the same direction then they 1 do not exert any force on one another 2 repel each other 3 attract each other 4 get rotated to be perpendicular to each other E

A Beaker containing a liquid is kept inside a big 3 closed jar If the air inside the jar is continuously pumped out the pressure in the liquid near the bottom of the liquid will be 1 Increase 2 Decrease 3 Remain constant 1 First decrease and then increase

Answer the following questions

A space 2 5 mm wide between two large pla surfaces is filled with oil as shown in diagra Force required to drag a very thin plate of a of one side 0 5 m just midway of the surfac at a velocity of 0 5 m sec is 1 N The coeffici of viscosity in kg m sec is 2 5mm 1 1 x 10 11 25 mm F 2 2 5 x 10 2 0 35 x 10 3

Q14 Reciprocal of bulk modulus is called compressibility If pressure experienced by certain volume of liquid increases by two times the compressibility becomes O A Decreases by half of its original value O 8 Decreases by two times c Compressibility will not vary under pressure D D Increases by two times

4 A voltmeter with resistance 500 2 is used to measure the emf of a cell of internal resistance 49 The percentage error voltmeter will be nearly in the reading of the 1 0 2 3 1 4 2 0 8 4 2 2 CEN

A particle is thrown at an angle a sin 3 in air as shown in the figure The angle received from the inside water is water Only one correct answer A 15 B 45 C 30 D 60 43

ght of the liquid in the beaker We have three beakers A B and C containing 21 three different liquids They are stirred vigorously and placed on a table Then liquid which is 1 Most viscous comes to rest at the earliest 2 Most viscous comes to rest at the last 3 Most viscous slow down earliest but comes to rest at the last 4 All of them come to rest at the same time

Two spherical metal balls of the same material with radii 0 2 cm and 0 3 cm are falling through a fluid at constant speeds If the speed of the first ball radius 0 2 cm is 4 cm s What is the speed of the other ball 1 6 cm s 2 8 cm s 3 9 cm s 4 12 cm s

If internal energy U of an ideal gas depends on pressure p and volume V of the gas according to equation U 3pV which of the following conclusions can you make regarding the gas a The gas is not a mono atomic gas b The gas can be a di atomic gas c The gas can be a tri atomic gas d Molar specific hoot

ALLEN 13 Two identical air bubbles are rising in water If they coalesce under isothermal condition to form a single air bubble the combined air bubble would have 1 Higher excess pressure but smaller terminal velocity 2 Higher excess pressure and higher terminal velocity 3 Lower excess pressure and smaller terminal velocity 4 Lower excess pressu

3 Infinite 4 Maximum but not infinite A displacement equation of a particle executes S H M is x sin oot then a Mean position x 0 1 b Mean position x 2 c Time period 3 1 a d 0 d Time period 2 b c 2 0 3 a c 4 b d 14 4 37 x sin a x b c 371 d 37 1 a

3 When a cation leaves its normal position in the crystal and moves to some interstitial space the defect in the crystal is known as a Schottky defect b F centre c Frenkel defect d non stoichiometric defect