Physics Questions

U shaped block of mass M 89 5 kg is carrying a smaller magnetic block of mass M 48 2 kg inside of it Block 1 experiences a force Fi which accelerates it Ahead of Block 2 is a magnet which exerts a constant force 284 N F252 4 N on Block 2 in the direction of motion What is the force that Block 1 exerts on Block 2 Pick the correct answer 0284 N 0503 N 0336 N 118 N

Fill in the table below each column of which refers to a spherical mirror and real object Distances are in centimeters if a number has no plus or minus sign in front of it find the correct sign C Type f cm P cm Real Image Upright A Concave 40 50 B 20 0 5 20 30

The circuit diagram shows a source of emf 10 V having an internal resistance of 2 50 connected to an ideal ammeter The jockey can be slided to different points on the Rheostat whose total resistance is 102 What can be the reading of the www DIA 2A jockey A wwwwwwww B

In the crystal structure of Fe O Fe and Fe occupy collectively 1 50 tetrahedral and 50 octahedral voids 2 25 tetrahedral and 75 octahedral voids 3 12 5 tetrahedral and 50 octahedral voids 4 50 tetrahedral and 100 octahedral voids

A force F k yi xj where kis a positive constant acts on a particle moving in the x y plane Starting from the origin the particle is taken along the positive X axis to the point a 0 and then parallel to the Y axis to the point a a The total work done by the force Fon the particle is 1998 2M

A satellite revolves in an equatorial plane in west to east direction around the earth with a period of 8 hrs At an instant it is observed vertically overhead a longitude After how much minimum time will the satellite again be overhead the same longitude a 8 h c 24 h b 12 h d 36 h

97 A cylindrical piston of mass M slides smoothly inside a long cylinder a certain mass of gas The cylinder is kept with its axis horizontal closed at one end enclosing the piston is disturbed from its equilibrium position it oscillates simple harmonically The period of oscillation will be h P 98 Gas A a T 2 c T 2 M Mh PA M PAh PHYSICSKOT 2 MA Ph d T 2n MPhA A hollow sphere is filled with water through the small hole in it It is then hung by a long thread

An ideal spring with spring constant kis hung from the ceiling and a block of mass M is attached to its lower end The mass is released with the spring initially unstretched Then the maximum extension in the spring is 2002 2M

A rod of length 10 cm made up of conducting and non conducting material shaded part is non conducting The rod is rotated with constant angular velocity 10 rad sec about point O in constant magnetic field of 2 tes la as shown in the figure The induced emf between the point A and B of rod will be 1 0 029 v 2 0 1 v 2cm 3cm X B 3 0 051 v h 27 0x 90 10 210x9x10 4 2 10 3 0 009 4 0 064 v lor velocity about an axis passing through one end and 0 01

0 O m 2m 0 For For 3mg k maximum tension in string is 4mg Smg k minimum tension in string is mg Frequency of osciliation of system in for all non zero values of xal 3mg

Consider the situation shown in fig The resistanceless wire AB is slid on the fixed rails with a constant velocity If the wire AB is replaced by a resistanceless semicircular wire the magnitude of the induced current will l XB XXX 1 increase Pemain the same XX X X XX X X X X A X X X XX X X X X B X X X X X X X va ba 3 decrease 4 increase or decrease depending on whether the semicircle bulges towards the resistance or away from it uniform magnetic field as shown in figure 27 SX S

A particle of mass 0 2 kg is moving in one dimension under a force that delivers a constant power 0 5 W to the particle If the initial speed in ms 1 of the partial is zero the speed In ms 1 after 5s is

Two spheres A and B of same mass M are given equal positive and negative charges Q and Q respectively Their masses after charging 1 Remains same 2 Mass of sphere A mass of sphere B 3 Mass of sphere A mass of sphere B 4 Cannot be predicted

a Magnetic field at axial point which is well inside the solenoid Honl 2 b Magnetic field at both axial end points of solenoid 0 0 and 9 180 B 0 90 and 02 180 B Honl 2 cos 0 cos 1807 Honl 2 cos 90 cos 1801 Honl 2 0

2 In an L R C series circuit the rms voltage across the resistor is 30 0 V acros the capacitor it is 90 0 V and across the inductor it is 50 0 V What is the rms voltage of the source VR V V sin 2 ft 14 31

01 Section B Graph of specific heat at constant volume for a monoatomic gas is C 1 2 Cy Previous Year 3 R 3R 2 4 Cy T AHMS 2013 TI TI T 1 mola of hydrogen is mixed with I mole of neon The molar specific heat at constant pressure is AIIMS 2014

the figure shown a uniform disc of mass 2m and radius 12 is lying at rest on a smooth horizontal surface A particle A of mass m is connected to a light string of length whose other end is attached to the circumference of the disc Initially string is just taut and tangential to the disc and particle A is at rest In the same horizontal plane another particle B of same mass m moving with velocity vo perpendicular to string collides elastically with A Just after impact which of the following statements will be true IC 2mv2 5l mv2 A Tension in the string is C Tension in the string is B 2m A 111 B Acceleration of the centre of the disc is 50

A mass of 2 grams is acted on by a restoring force 10 dynes cm and resisting force 2 dynes s cm The motion of the particle is 205 overdamped simple harmonic damped oscillatory critically damped

The coefficients of friction and masses of various blocks are shown If f is the limiting frictional force between block A and surface and f is the frictional force between block B and C for what value of applied force F f 5f 71 B 10 57 10 A C 51 10 mg 61 10 umg D mg umg B mass 10 m Rod 09 8 C mass 50m P 0 A mass m f ELE

02 mp T TI 3 mole of hydrogen is mixed with 1 mole of neon The molar specific heat at constant pressure is AIIMS 2014 1 9R 4 13R 2 13R 9R 4 2 73 2 4 ntained in a box of volume V 1 00 m at T 300 K The gas is heated to a temperature of T

A metallic rod of cross sectional area 9 0 cm and length 0 54 m with the surface insulated to prevent heat loss has one end immersed in boiling water and the other in ice water mixture The heat conducted through the rod melts the ice at the rate of 1 gm for every 35 sec Find the thermal conductivity in W m K of the rod Latent heat of fusion of ice 80 cal g J 4 2 J cal

In which of the following devices the eddy current effect is not used 1 Electric heater 2 Induction furnace 3 Magnetic braking in train 4 Electromagnet A 800 turn coil of effective area 0 05 m is kept perpendicular to a magnetic field 5 105 T When the plane of the c NEET 2015

The mutual inductance between a primary and secondary circuits is 0 5H The resistance of the primary and the seconday circuits are 2002 and 5 2 respectively To generate a current of 0 4 A in the secondary current in the primary must be changed at the rate of 4 0 amp sec 2 16 0 amp sec 3 1 6 amp sec 4 8 0 amp sec are placed near each other on a passing a current of 3 0 A in A the flux linked with A

A circular platform rotates around a vertical axis with angular velocity 1U rad s On the platform is a ball of mass 2 kg attached to the long axis of the platform by a thin rod of length 6 cm 3U F normal force exerted by the ball on the platform in newton Friction is absent

A block of mass 2 kg is free to move along the x axis It is at rest and from t 0 onwards it is subjected to a time dependent force F t in the x direction The force F t varies with tas shown in the figure The kinetic energy of the block after 4 5 s is 2010 F t 4N L 1 3s 4 5s

2 In a thermocouple the temperature of the cold junction and the neutral temperature are 40 C and 275 C respectively If the cold junction temperature is increased by 60 C the neutral temperature and temperature of inversion respectively become a 275 C 530 C c 275 C 590 C b 355 C 530 C d 355 C 590 C

If a thin mica sheet of thickness t and refrective index 5 3 is placed in the path of one of the interfering bean as shown in fig Then the displacement of the fringe system is Question Type Single Correct Type 1 2 3 Dt 3d 2Dt 3d Dt 4d Dt 2d 2D

4 The work done in an adiabatic process is always zero Two thermally insulated vessels 1 and 2 are filled with air at temperature T T volume V V and pressure P P respectively If the valve joining the two vessels is opened the temperature inside the vessel at equilibrium will be AIEEE 2004 1 T T 2 T T 2 T T PV P V 4 PVT P V T T T PV P V 3 PV T P V T Which of the following is incorrect regarding the first law of thermodynamics AIEEE 2005

4 A wire of length is bent to form a semicircle If it has charge Q then electric field intensity at the centre of the ring is a Qn 4801 b Q c 4 1 O O 480 2801 d

Two uniform rods tied together with the help of a string are balanced as shown in the figure The minimum coefficient of friction for which the system will remain in equilibrium in the position will be 37 37

4 The all times If the water level falls by 4 cm every hour determine the shape of the jar i e specify x as a function of y The radius of drain hole is 2 mm and can be assumed to be very small water clock jug is such that water level descends at a constant rate at compared to x Drain hole X

A rectangular coil has 60 turns and its length and width is 20 cm and 10 cm recpectively The coil rotates at a spec 1800 rotation per minute in a uniform magnetic field of 0 5 tesla Then the maximum induced emf will be 3 113 V 2 110 V 1 98 V 4 118 V

A constant force F is being applied on a rod of length kept at rest on two parallel conducting rails connected at ends by resistance R in uniform magnetic field B as shown the power delivered by force will be constant with time 2 the power delivered by force will be increasing first and then will decrease 3 the rate of power delivered by the external force will be increasing continuously 4 the rate of power delivered by external force will be decreasing continuously Gal aft side of line PO has a magni

3 Two straight infinitely long current carrying wires are kept along z axis at the coordinates 0 a 0 and 0 a 0 respectively as shown in the figure The current in each of the wire is equal and along negative z axis into the plane of the paper The variation of magnetic field on the x axis will be approximately a AB X

Four capacitors are joined as shown in the figure The capacity of each capacitor is 8uF Equivalent capacitance between A and B is A 1 2 F 3 16 F H1 2 TH B 8 F An P

8 A circuit consists of five identical conductors as shown in figure The two similar conductors are added as indicated by the dotted lines The ratio of resistances before and after addition will be a c 755553 12 12 1Q 12 b d 315 65 19

In the figure shown a block of weight 10 N resting on a horizontal surface The coefficient of static friction between the block and the surface 0 4 A force of 3 5 N will keep the block in uniform motion once it has been set in motion A horizontal force of 3N is applied to the block then the block will Choose only 1 answer A R Your Answer Move over the surface with constant velocity Move having accelerated motion over the

NAU AW in a adiabatic process 3 AU AW in a adiabatic process 4 AU AW in a isothermal process If C and C denote the specific heats per unit mass of an ideal gas of molecular weight M where R is gas constant then AIPMT 2010 1 C C R M 2 C C R 3 C C R M 4 C C MR th of its original volume What is

A B ring along the axis of the ring and it passes through the ring N S B A are right left faces respectively 1 when magnet goes towards the ring the face B becomes south pole and the face A becomes north pole 2 when magnet goes away from the ring the face B becomes north pole and the face A becomes south pole 3 when magnet goes away from the ring the face A becomes north pole and the face B becomes south pole 4 the face A will always be a north pole tic particle is released from a point on the axis

uniform magnetic field of intensity directed into the plane of the paper exists in the cylindrical region of radius 1 m A uniform loop of resistance 100 olded in the form of equilateral triangle of side length 2m is placed as shown in figure Find the maximum potential drop in volt in wire AB A xx1m xxx x X x xx X xxx B sin 2t B

A 30 cm by 40 cm rectangular loop rotates at 130 rad s in a magnetic field 0 06 Wb m normal to the axis of rotation If the loop has 50 turns determine the induced voltage in the loop

A particle of mass m is thrown with speed vo at an angle 30 with horizontal The angular momentum about the point of projection when the particle is at the highest point of its trajectory Question Type Single Correct Type 1 2 3mv 2g 3mv 8g

Find the value of a for which the vector A is solenoidal A 2xi 2ayj 4zk ans

A force is given as F a B vis velocity Then dimensional e 1 ML T 2 3 M L T 4 where F is force formula of a B 2 is 2 M L T 2 4 M L T 2

5 points An optical power of 0 5mW is initially launched into an optical fibre The power level is found to be 0 0199mW after 4 km The attenuation coefficient in this fibre will be 1 5 dB km 2 5 dB km 3 5 dB km 345 dB km Save Answer

48 A circuit consists of five identical conductors as shown in figure The two similar conductors are added as indicated by the dotted lines The ratio of resistances before and after addition will be a G 5 192 12 192 19 b d 315 615 12

As shown in figure two vertical conducting rails separated by distance 1 0 m are placed parallel to z axis At z 0 a capacitor of 0 15 F is connected between the rails and a metal rod of mass 100 gm placed across the rails slides down along the rails If a constant magnetic fields of 2 0 T exists perpendicular to the plane of the rails what is the acceleration of the rod Take g 9 8 m s AIIMS 2017 HT 3 9 8 m s 4 zero

A thermodynamic system undergoes cyclic process ABCDA as shown in figure The work done by the system in the cycle is NEET 2014 1 RY 2 2P V P 3Po 2Po Pot A V 2Vo V 3 P V 4 zero

Two particles are in SHM with same amplitude A and same angular frequency o At time t 0 on A A at x and other is at x Both are moving in same direction 2 2 A Phase difference between the two particle is B Phase difference between the two particle is C They will collide after time t D They will collide after time t NET 200

The excess pressure inside an air bubble of radius r just below the surface of the water is P The pressure inside a drop of the same radius just outside the surface is P2 If T is the surface tension then AP 2P Your Answer B P P Correct Answer P 2P DP 0 P 0