Physics Questions

1 3 2 2 5 3 2 Three capacitors 3uF 10uF and 15 F are connected in series to a voltage source of 100 V The charge on 15 F is 1 22 C 3 2800 C 4 200 C 2 100 C llel plates capacitors of value C and 2C are connected in parallel and are charged to a potential difference V d hotween the plates of the capacitor

A B C discussion I will use the Ask student if online template to send a message the student I will solve the entire question anyway and post the solution before exiting the session

Between the plates of parallel plate condenser a plate of thickness t and dielectric constant K is placed In the rest of the space there is another plate of thickness t and dielectric constant k The potential difference across the condenser will be o 5 A k k Q 3 A k k A t 2 4 QL A EQ k t k t

A man is inside a lift which goes up and comes down with same constant acceleration If the ratio of apparent weights in two cases is 3 1 what is acceleration of lift g 10 m s 3 3 m s 4 m s 1 5 m s

In the circuit given charge in uC on each capacitor in steady state will be 452 2 19 3 F HI 3 F 452 402 ww Fww 10V 12 3 8 3 F 11 3 F 4 6

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates The quantity tha remains unchanged is Charge Q 2 Potential V 3 Capacity C 4 Energy U

A body with mass 5 kg is acted upon by a force F 37 41 N If its initial velocity at 1 0 Is v 6 12 ms then the time at which it will just have a velocity along x axis is

Which graph best represents the variation of electric potential as a function of distance from the centre of a uniformly charged solid sphere of charge of radius R V4 V4 1 3 R 2 4 V R r R r

Four point charges of charge 1 C each are placed at four corners of a square of side 2 m The work done in removing a charge 2 C fr centre of square to infinity is 1 28 J O 19 61 J O 50 9 mJ 4 83 J View in English

The plates of parallel plate capacitor are charged upto 100 V A 2 mm thick plate is inserted between the plates Th to maintain the same potential difference the distance between the plates is increases by 1 6 mm The dielectric c stant of the plate is 1 5 2 1 25 3 4 4 2 5

The velocity of a body as a function of time t is given as v 2ti t j m s What is force acting on the body at t 2 s if its mass is 4 kg 41 7j N 12i 18 N 8 16 N 1111 12 16 N

17 ALI Five capacitors are connected to each other as shown ahead What is the potential drop and charge across 4 F capacitor D B HHH PH 18 F 6uF 4uF 8uF 18uF 1 6 V 30 C 3 6 V 40 C 30V 2 10 V 30 C 4 10 V 40 C

A ball moving with momentum of 15 kg ms strikes against wall at an angle of 60 with plane of wall and reflects back with same momentum at same angle The Impulse on the ball is 15 kg ms 51 36 kg ms 15 3 kg ms1 Fern

The position time graph of a body of mass 3 kg is shown in figure The magnitude of impulse acting on the object at t 3 sis 12 m Position 6 m 6 kg m s 9 kg m s 12 kg m s 2 3 t s

Problem 19 Find the induced emf in the V shaped loop of Figure given below a Take B 0 1azWb m and u 2ax m s and assume that the sliding rod starts at the origin when t 0 b Repeat part a if B 0 5x azWb m

1 100 joule 2 500 joule 3 1000 joule 4 300 joule A Carnot engine works between ice point and steam point Its efficiency will be 26 81 2 53 36 3 71 23 4 85 42 In the above problem in order to increase the efficiency of the engine by 20 its sink temperatur

A body starts falling from rest from a large height If t 1 and fo are the time taken by the body to cover successive equal distances then 1 is 1 2 3 1 2 3 1 2 4

The geographic meridian is defined as The vertical plane containing the latitude circle and the axis of rotation of earth The horizontal plane containing the latitude circle and the axis of rotation of earth The vertical plane containing the longitude circle and the axis of rotation of earth The horizontal plane containing the longitude circle and the axis of rotation of earth

P Problem 4 The surfaces p 3 p 100 z 3 and p 5 p 130 z 4 5 define a closed surface a Find the enclosed volume b Find the total area of enclosing surface Ans a 6 28 b 20 7

A hollow conduct sphere is placed in an electric field produced by a point charg figure Let V and V be the electrostatic potential at points A and B respectively Then 1 VA VB 2 VB VA 3 VB VA 4 Relation cannot be determined with the given information ACITORS AND CAPACITANCE B A P onstant verywhere

Problem 9 Two straight nonconducting wires parallel to the z axis pass through points O and A as shown in figure below The wires carry equal and uniform charge density 0 4 C m Determine the electric field at point P EA 45 P Eo 8 0 m

Two point charges of 1 0 C are kept stationary 2 m apart How much work is needed to be done to bring them 1 m apart 2 1 4 5 mJ 3 45 mJ An particle is accelerated from root thro 10 6 10 2 9 mJ 4 90 mJ tontial of Y volts Its final kinetic energy is

When a horse pulls a wagon the force that causes the horse to move forward is the force Horse exerts on ground Horse exerts on wagon Wagon exerts on horse Ground exerts on horse

The electrostatic potential existing in space is given by V xy yz zx volts where x y and z are in metres The angle made by electr field Eat 2 m 2 m 2 m with positive x axis is a Then cosa 1 3 cosa 3 sin a tana 1 3 5

The motion of a particle is described by an equation x at bt where a 15 cm s and b 3 cm s The instantaneous speed of particle at 3 s is 32 cm s 16 cm s 18 cm s

Electric Potential due to a Point Charge Electric Dipole System of Charges and Charged Bodies 4 Three isolated equal charges are placed at the three corners of an equilateral triangle as shown in figure The statement which is true for net electric potential V and net electric field intensity E at the centre of the triangle is q 94 1 E 0 V 0 3 V 0 E 0 O q 2 V 0 E 0 4 V F 0

The displacement of a progressive wave is represented by y Asin kx ot where x is distance and t is time The dimension of w k is same those of Angular wave number Frequency Amplitud e Speed

Which of the following statements is are true A A body can have constant speed with varying velocity B A body can have constant velocity with varying speed C A body can have velocity without acceleration D A body can have acceleration without having velocity A and B A B and C A C and D B C and D

In case of an unbiased PN junction 1 N side is at higher potential than P side 2 N side is at lower potential than P side 3 There is no potential difference exists 4 No electric field is present

An electric dipole of length 2 cm is placed with its axis making an angle of 30 to a uniform electric field 105 N C If it experiences a torque of 10 3 N m then potential energy of the dipole 1 10 J 3 30 J 2 20 J 4 40 J

12 Two concentric hollow conducting spheres of radius r and R are shown The charge on outer shell is Q What charge should be given to inner sphere so that the potential at any point P outside the outer sphere is zero 1 Qr R 3 Q R X 2 4 P QR r 2QR

Four charges of same magnitude q are placed at four corners of a square of side a The value of electric potential at the centre of the square will be Where k 1 1 4 0 4kq 4kq 3 2a 2 4 2 kq a 4 kq a 2

1 127 C Efficiency of carnot engine is 100 if 1 T 273 K 2 T 0 K 3 T 273 K 2 The effriency of Carnot s engine operating between reservoirs maintained 4 T 0 K at temperatures 279 4 04

A rectangular coil 25 cm by 45 cm has 150 turns This coil produces a maximum emf of 75 V when it rotates with an angular speed of 190 rad s in a magnetic field of strength B Find the value of B 0 98 T 0 72 T 0 023 T 0 054T

A charge of 10uC is placed at the origin x y coordinate system The potential differenc between two points 0 a and a 0 in volt will b 1 all 3 9 104 a 9x104 2 9 104 a 2 4 Zero

An a particle is accelerated from rest through a potential of V volts Its final kinetic energy is 4 90 mJ 1 2 eV 2 1 eV 3 4 eV 4 1 eV

A gas is expanded from volume V to 2V under three different processes Process 1 is isobaric process process 2 is 0 isothermal and process 3 is adiabatic Let AU AU and AU3 be the change in internal energy of the gas is these three processes Then

7A body is subjected to a constant force of 10 N towards the East and it is moving towards the West with the speed of 54 kmph If it is given that mass of the body is 1600 grams and assuming that the force is applied at an instant t 0 then find the difference between the positions of the body at t 8 seconds and 12 seconds

4 H and He respectively In a cyclic process shown in the figure an ideal gas is adiabatically taken from B and A the work done on the p during the process B A is 30 J when the gas is taken from A B the heat absorbed by the gas is 20 J The chan in internal energy of the gas in the process A B is 30J 3 50 I 20J V 4 10 J

3 It is quite probable 4 Data are incomplete A Carnot s engine is made to work between 200 C and 0 C first and then between 0 C and 200 C The ratio of efficiencies of the engine in the two cases is 1 1 73 1 2 1 1 73 3 1 1 4 1 2 finou of a carnot engine is 50 when temperature of outlet is 500 K In order to increase up to 60 keeping

1 1 x 105 N m 2 1 x 10 5 N m 3 1 4 N m A given quantity of a gas is at pressure P and absolute temperature T The isothermal bulk modulus of the gas is 1 P 2 P 3 P 4 2P Then A and B corresponds to different gases Then A and

MT 2 2 MLT 3 MLT 4 LT Some students find values of C and C for a gas in calorie gm mol K Which pair is most correct RPMT 2010 P 1 C 3 C 5 4 C 3 C 42 Hydrogen gas is filled in a container of volume 20 litre Average translational kinetic energy of all its molecules is 1 5 2 C 4 C 6 3 C 3 C 2 IRPMT 2010

In compound microscope the magnification is 95 and the distance of object from objective lens 1 3 8 cm and focal length of objective is 1 4 cm What is the magnification of eye piece when final image is formed at least distance of distinct vision A 5 C 100 B 10 D None

HONCHHICHOLO C H I2 T THHITH WITH DOMOVIT 15 49 one statement of text book is two thermometers through the corks are used to note the temperature T2 of water in calorimeter and T1 of hot water in between the double walls Is it true I think both temperature will interchange I mean T2 will be T1 and T1 will be T2 please explain thank you 15 49

A hollow cylinder of mass 2kg and radius 10cm is rotatitng about its axis at 30 rpm Torque required to stop it after 2 rotations in Nm is 1 25 x 10 A B 2 25 x 10 C 1 25 x 10 4 D 2 5 10 4

3 W 0 Q 0 and AU Q 4 W 0 Q 0 and In an adiabatic process on a gas with y 1 4 the pressure is increased by 0 5 The volume decreases by about 1 0 36 2 0 5 3 0 7 4 1 of an ideal gas undergoes the chage represented by XYZX below Fig Which one of the following s

1 1000 K 2 960 K 3 846K 4 754 K A scientist says that the efficiency of his heat engine which operates at source temperature 127 C and sink tempera ture 27 C is 26 then AUMS 41

11 Two metal plates have potential difference of 300 V and are 1 cm apart A charged particle of mass 1 96 10 15 kg is held in equilibrium between the plates of the capacitor then the electric field will be 1 30 V m 3 3 V m 2 30000 V m 4 300 V m

The potential at a point 0 1 m from an isolated point charge is 100 volt The nature of the point charge is 1 Positive 2 Negative 3 Zero 1 Either positive or zero

3 at normal temperature and pressure 4 Q If a diatomic gas is supplied heat Q in a process it performs work process 2R 1 5 f 2 R 3 What is molar heat capacity of the gas in this RPMT 2010 dimension of a RPMT 2010