Physics Questions

The position vector of a particle at any time is given as 7 3ti 212 5k The direction of velocity of particle att 1 sis Making 53 angle with x axis Making 37 angle with x axis Making an angle of 30 with y axis Making an angle of 45 with x axis

30 The diagram below shows equipotential lines in a region where there is a uniform electric field A proton is released from rest at the point marked with an O Which ONE of the following statements best describes the motion of the proton after its release OV IV 0 1 0 m 2 V 3 V A It will remain stationary at the point marked with an O to the right B It will move at a constant velocity of 1 0 ms C It will move at a constant velocity of 3 0 ms to the left D It will accelerate at 1 2 x 10 ms to the right E It will accelerate at 2 9 x 10 ms2 to the left

The acceleration of a body starting from rest varies with time following the equation a 3t 4 where a is in ms 2 and tin s The velocity of body at 2s will be 18 m s 14 m s

1 total energy kinetic energy 3 potential energy A body starts from rest with uniform acceleration and acquires a velocity V in time T The instantaneous kinetic energ of the body after any time t is proportional to 1 V T t 2 V T t 1 V T 3 V T t If u mand F denote the velocity momentum and kinetic energy of the particle then

A pendulum bob of mass m carrying a charge is at rest with its string making an angle 8 with the vertical in a uniform horizontal field E The tension in the string is mg sin 8 mg cose qE sin 0 qE cose

At the room temperature the velocity of sound in 0 gas is V Then in mixture of H and O gas the speed of sound at same temprature BEGIGH 11 BERIG 49 30 31 F A will be less than V V B will be more than V v 30 t C will be equal to V V CRIER NI D nothing can be said Hal ches Your Answer D

One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge Then Mass of A and mass of B still remain equal Mass of A increases Mass of B decreases Mass of B increases and of A decreases

There is no net transfer of energy by the particles of the medium in Longitudinal wave Transverse wave Progressive wave Stationary wave

An insect crawling up a wall crawls 6 cm up in first second and then slides 4 cm down in next second It again crawls up 6 cm in third second and again slides 4 cm downwards in 4 second How long will insect take to reach a hole in wall at a vertical height of 24 cm from starting point 97

The parallax of a heavenly body measured from two points diametrically opposite on equator of earth is 2 arc minute If radius of earth is 6400 km the distance of heavenly body from earth is 1 1 x 109 m 1 9 x 10 0 m 2 2 x 1010 m

Coefficient of performance B of an ideal refrigerator working between temperatures 7 and T T T is B 11 T T T T T T B T T T T T T

A mosquito is moving with a velocity 0 5t i 3tj 9k m s and accelerating in uniform conditions What will be the direction of mosquito after 2 s tan tan 1 tan 1 tan 1 1 3 from y axis 2 3 from y axis from x axis from x axis

A uniform electric field is present in X Yplane Due to electrostatic field electric potentials of point A 2 m 2 m B 2 m 2 m and C 2 m 6 m are 4 V 10 V and 16 V respectively The electric field is V m 3 2j 31 6j 2 4i 6j 51 6j 2

A mass of 3 kg rests on horizontal plane The plane is gradually inclined until a an angle of 37 to horizontal the mass just begins to slide down The coefficie of static friction between block and surface is 0 0 2 0 5 O 0 75 0 90

A proton of mass m approaches from very large distance towards a free proton with velocity vo along straight line joining their centres The distance of closest approach of tw protons is e 2Emv 8 TEMV e TE MV

The number of electrons present in 8 C of charge is 5 0 1018 10 0 1018 5 0 1019 10 0 1019

Ques 4 A pipe 10 cm in diameter contains steam at 100 C It is covered with an insulating material that is 5 cm thick This insulating material has a constant of thermal conductivity K 0 0006 The outside surface of the system is 30 C Find the heat loss per hour from a meter length of the pipe

If an object is 8 cm from a lens and produces an image 4 cm from the lens what is the magnification factor M same size of the object triple size of the object double size of the object half the size of the object

10FI YA A bar is subjected to axial forces as shown If Y is the modulus of elasticity of the bar and A is its cross section area its elongation will be 4F 2F 8FI YA 4FI YA 6FI 2 2F hr 1 min

4 A long cylindrical vessel is half filled with a liquid When the vessel is rotated about its own vertical axis the liquid rises up near the wall If the radius of vessel is 5 cm and its rotational speed is 2 rotations per second then the difference in the heights between the centre and the sides in cm will be a 0 4 b 2 0 c 0 1 d 1 2

Identify the correct statement O Kinetic friction depends on area of contact for a given normal contact face O Coefficient of kinetic friction is generally less than coefficient of static friction O The magnitude of kinetic friction cannot be more than static friction Coefficient of static friction does not depend on surface nature in contact

Shown in the figure is a shell made of a conductor It has inner radius a and outer radius b and carries charge Q At its centre is a dipole pas shown In this case Main 2019 12 Argil I P Choose only 1 answer A Surface charge density on the inner Q 2 surface is uniform and equal to

he acceleration of a body starting from rest varies with time following the quation a 3t 4 where a is in m s2 and t in s The velocity of body at t will be 18 m s 14 m s O 12 m s 20 m s

An AC circuit consists of a 2200 resistance and a 0 7 14 choke Find the impedance of the coat when the resistance and the choice are in series and are connected to a 220 V and 50 Hz source O Click here to view this option tef No 241401 O O D Click here to view this option et No 211401 Click here to view this option set 241401 Click here to view this option et No 241401

A tube of length 3 m is filled completely with an incompressible liquid of mas kg and closed at both ends The tube is rotated in horizontal plane about one its ends with angular speed of 1 rad s The force exerted by liquid at other en is 1 N 02N 03 N 06N

soap bubble is charged to a potential of 16 V its radius is then doubred The potential of the bubble now will be Click here to view this option Ref N 241101 Click here to view this option et No 241401 Click here to view this option et No 241401 CEck here to view this option Ref No 241401

The radii of circular paths of two particles of same mass are in ratio 3 4 ther what will be ratio of speed if they have some magnitude of centripetal force 02 3 O32 O 3 1 45

A wheel of per meter 220 cm rolls on a level road at a speed of 9 km h How many evolutions does the wheel make per second 5 Click here to view this option Ret No 241401 Click here to view the option stel No 241401 Click here to view this option et No 241401 Click here to view this option set No 291491 D D D

Ques 3 A circuit consists of a resistance R ohm s and a condenser of C farads connected to a constant e m f If is the voltage of the condenser at time t after closing the circuit Show that the voltage at time t is E 1 eck

A truck starts from rest and has acceleration of 4 ms 2 A box is inside truc which is at 6 m from open end of truck The coefficient of friction between t and truck is 0 1 How much time box will take to slip out of truck 02s 03 1s 03 85 01 5s

vectors each of a magnitude V make an angle of 60 with each other The magnitude of the sessitant vector a Click here to view this option et N 241401 Click here to view this option et No 241401 GEMEENTE W

By how much should the temperature of a brass rod be increased so as to increase its length by 1 Given for brass is 0 00002 O Cick here to view this option et No 341401 D Click here to view this option D el tu 241401 Click here to view this option Ref No 241401

Ques 5 A constant electromotive force E volts is applied to a circuit containing a constant resistance R ohms in series and a constant inductance L henries If the initial current is zero show that the current builds up to half its theoretical maximum in L log2 R seconds

A body executing uniform circular motion has position vector and accelera vector Are perpendicular to each other Are along same direction Are in opposite direction May be inclined at any angle

n accordance with Kirchhoff s law for a black body radiation which one is wrong Bad absorber is a bad emitter Bad reflector is a good emitter Bad emitter is a good absorber

Two point charges 4Q and Q are placed on X axis as shown in the figure Distance between two charges is 4 m Electrostatic potential is zero on the X axis at a distance 4Q Q 4 m m from charge Q m from charge 4Q 4 m from charge 4Q Both 1 and 3 are correct

A man of mass 60 kg stands on weighing machine in a lift which is moving down and speeding up with an acceleration of 2 3 m s What will be reading the weighing machine scale g 9 8 m s 450 N 720 N 680 N 380 N

A freely running motor rests on a thick rubber pad to reduce vibration Fig 1 53 The motor sinks 10 cm into the pad Estimate the rotational speed revolutions per minute i e RPM at which the motor will exhibit the largest vertical vibration UC Berkeley TT 10 cm

An object is dropped from the top of a tower It travels a distance 5 m in the fir second and 25 m in the last second The speed with which object strikes the ground is g 10 m s 30 m s O 50 m s 40 m s 20 m s

um logic gate we switch cloxo I uhim ourdon t wined Path 6V 221 1 bez it will offer existence m 14 The circuit 1 NOR 3 OR A 0 B 71 31 ww R ww R LED Y 2 AND 4 NAND

7 893 gram of a substance occupies a volume of 1 1 cm The density c substance with appropriate significant figures is 07 18 g cm 3 O 7 20 g cm 3 7 2 g cm 3 O 7 175 g cm 3

The lengths of two cylindrical rods are measured as I 5 62 0 4 34 0 02 cm What is maximum percentage error in measur difference of lengths of two cylinders 0 1 6 02 34 O 1 95 O 3 16

For the velocity v time t graph shown below what is the average velocit object during first 7 seconds 10 m s 013 O 4 2 m s 6 5 m s O 5 7 m s O 5 0 m s 5 7 t s

11 From a place on the ground that is 20 m away from a wall a bullet is fired aiming at a 50 m high mark on the wall The location of the bullet is shown by a circular dot at some point of time Where on the wall will the bullet hit a 20 m mark c 30 m mark b 25 m mark d 35 m mark 50 25 m 5 10 15

TO 180 2 An electric dipole is situated in electric field of uniform intensity Ewhose dipole moment is P and moment of inertia If the dipole is slightly disturbed from the equilibrium position then the time period of oscillation about its centre is 2 2 PE 2 PE 2 2PE Mark Tor Review 2PE 02 35 hr min

Two concentric spheres of radii 1 m and 2 m have similar charges with equal surface densities o The electric potential at the common center is 30 blow 20 ola

q Three charges each of magnitude q are placed at the corner of an equilateral triangle of side a the electrostatic force on each charge will be 9 q 4 a N 39 4 8a 2q 4 a Zora nr 9 min

When separation between the charges is increased the electric potential energy of the system of charge Increases Decreases Remains same May increase or decrease

Electric Potential at the Edge of a Disc Calculate the electric potential due to a uniformly charged conducting circular disc at a point lying at the edge of disc Surface charge density on disc is o cou x 8 5 Coul n

When a car passes mark A driver applies brakes Thereafter reducing where in the Road speed uniformly from 160 km h at A the car passes mark with a speed as the car moving 40 km h The marks are at equal distances on the road as shown below with a speed of 100km ha Neglect size of car a at mark B Mark A Mark B Mark C Lb wA B c B w l