Physics Questions

Which of the following is a non conservative force 1 Buoyant force 2 Electric force experienced by a charge kept in a time varying magnetic field 3 Electric force experienced by a charge kept at a distance in front of an unlike stationary charge 4 Spring force

6 A alone can do a piece of work in 3 days while B alone can do the same work in 2 days If they wor together to complete the work their total wages is fixed X225 Find the share of A RRB 2008 a X 90 b X 75 c X 95 d X 65 e None of the above

Plane z 0 y 100 TONY X P Wide curved trace section Thin trace section L iii If the field at point P due to the thin trace section is H I sin 0 2 A m 2n a B a b 2 8 marks

Line x 2 z 2 carries charge of linear charge density 2 nC m while plane x 2 carries charge of surface charge density nC m Find the force N on a 2 point charge 3 C located at origin 1 9x 10 Sl unit 4 TE

6 A wire suspended vertically from one of its ends is stretched by attaching a weight of 500N to the lower end The weight stretches the wire by 2mm Then the elastic energy stored in the wire is A 0 25 joules B 10 joules C 1 joule D 0 5 joules

A uniform wire of resistance R is stretched uniformly to n times its original length and then cut to form five wires of equal length These wires are arranged as shown in figure The effective resistance betweer points A and B is 1 nR 5 n R A B 2 4 R 5n R

5 In an ideal transformer input A C voltage is 220 V Current in secondary coil is 2 5 A If the ratio of number of turns in primary coil and secondary coil is 1 10 find 1 Output voltage 2 Current in primary coil 3 Input and output power Ans 2200 V 25 A 5500 WI

A force F k acts at origin then torque of the 10 force w r t to point 1 1 is 1 F i j 3 F i j 2 F i j 4 F i j fara a forg k 11 1 F i j 3 F i j 2 F i j 4 F i j

Assertion Mass is a property of one object alone whereas weight results from the interaction of two objects Reason The weight of an object is proportional to its mass

A 2 D 1 B 12 12 C 1 Let the instantaneous velocity of a rocket just after launching be given by the expression v 2t 3t2 where v is in ms and t is in seconds Find out the distance traveled by the rocket from t 2 s tot 3 s sin 2x dx A 32 m B 24m C 15 m D 50m A particle moves with a constant acceleration a 2 ms along a straight line Obtain an expression for its velocity A 2t c B 3t c C 19t c D t c A particle moves with a constant velocity v t 3t 1ms along a straight line Obtain an expression for its displacement A 2t c t 3t 2 1 3t C t c A C D t c 3 2 The acceleration of a particle is given by a t 31 5 where a is in ms2 and t is in second Calculate the displacement of the particle where c d are constants t5 t 5t t t ct d 20 4 t ct d 2 t 5t 20 4 2 B ct d t 3t 2 4 t 3t D 3 2 B t c 20 4 t 31 5t 2 t c

A thin wire loop carrying current is placed in a uniform magnetic field B pointing out of the plane of the coil as shown in figure The loop will tend to O B Move towards right Move towards left Contract Expond

Two small balls having equal positive charge Q each are suspended by two insulating strings of equal length L from a hook fixed to a stand The whole set up is taken in a satellite into space The tension in each string is 0 8 48L 1 Q 4 21 1 Q 4TE 41

15 The magnitude and direction of the current in the circuit shown will be 10V 1 a 2 7 3 192 www www 6 92 www 692 C 4V A from a to b through c 29 b A from b to a through c 7 S 3 3 1 A from a to b through c12 01 16 C 1

The output of microphone is rated at 52 db The reference level is 1 V under specified sound conditions What is output voltage of microphone under the same sound conditions 2 5 mV 3 8 mV 6 3 mV 1 5 mV 2500 uV

A particle of mass m and charge q accelerate by potential difference V and enters a region of uniform transverse magnetic field B If d is width of region of magnetic field d r the angle through which particle deviates is sin 8 Bd cose Bd tan 8 Bd cote Bd 9 2mV 9 2mV 9 2mV 9 1 2 1 2 1 2 1 2

C 3 1 If y 3x 2 then find If y 3x tanx then find 6 2x 2x 5 dx 3 3 x dx 1 2 sin x cos x dx uy dx dy dx f sec ec xtanx cosx dx 3 If y 7x 11x 39 find dy dx

Assertion The tendency of skidding or overturning is quadrupled when a cyclist doubles his speed of turning Reason Angle of bending measured from ground decreases as velocity of vehicle increases

A battery of e m f 2 0 V and internal resistance 0 52 is connected across a resistance of 9 52 The number of electrons flowing through the cross section of resistance per second is 1 25 x 1018 1 25 x 1017 X 2 5 1018 17

A particle is dropped from the top of a tower and at the same time another particle is thrown horizontally from the same point Their relative velocity with time in air is A Vertical B constant in a different direction from horizontal as well as vertical C Horizontal D Variable

Six identical conducting rods are joined as shown in figure Points A and D are maintained at temperature of 200 C and 20 C respectively The temperature of junction B will be R A 200 C 1 120 C 3 140 C C B 2 100 C 4 80 C D 20 C

uniform linear charge densities 2 and Radius of inner cylinder is a and that of outer cylinder is b A charged particle of mass m charge q revolves in a circle of radius r Then its speed v is Neglect gravity and assume the radii of both the cylinders to be very small in comparison to their length q 2 Eo m 20 a VV b 2 2 q V Eo m a

One mole of an ideal monoatomic gas at temperature T expands slowly according to the law P V constant If the final temperature is 2T heat supplied to the gas is VZP 20 1 2RT 2 3 2 RT 2 LRT

Three conducting rods of same material and cross section are shown in figure Temperatures of A D and C are maintained at 20 C 90 C and 0 C The ratio of lengths of BD and BC if there is no heat flow in AB is 1 1 2 7 A 20 C 20 C B D C 90 c 2 7 2 O C

Assertion Magnitude of the contact force is always greater than the magnitude of frictional force Reason Contact force is the resultant of the friction force and normal reaction

O 18 J O 28 J Read More n a thermodynamic process pressure of fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas If nitial internal energy of the gas was 40 J what will be final internal energy O 52 J estio question

Kirchhoff s junction and loop laws of electricity are Law of conservation of charge only Law of conservation of energy only Law of conservation of charge and energy respectively Law of conservation of energy and charge respectively

Two infinite long parallel wires A and B carrying current 10 A and 20 A respectively in opposite direction are placed at a separation of 30 cm The magnetic field will be zero at 10 cm from A between the wires 10 cm from B between the wires 30 cm from A outside the wires 30 cm from B outside the wires

1 Two projectiles one fired from the surface earth with speed 5 m s and the other fired from the surface of a planet with initial speed 3 m s with some angle of project trace identical trajectories Neglecting friction effect the value of acceleration due to gravity on the planet is 2 3 5 m s 08 4 8 5 m s2 183 1 5 9 m s STU 3 16 3 m s 8

Choose the correct statement Read More O Internal energy is a path function while heat is not O Heat is a path function while internal energy is not O Both heat and internal energy are not path function

A conducting rod of length 1 m and mass 1 kg is suspended by two vertical wires through its ends An external magnetic field of 2 T is applied perpendicular to rod and plane of arrangement The current to be passed through the rod to make tension zero is g 10 m s 0 5 A 15 A 5 A 15 A

4 The length of the resistance wire is increased by 30 by stretching it What is the corresponding change in resistance of wire 1 30 3 44 2 55 4 69

The power output of an audio system is 18 W For a person to notice an increase in the output Loudness sound intensity of the system what must be the output power must be increased to 11 6 W 0 022 KW 22 68 W 14 2 W

The phase difference between current and voltage in an AC circuit is radian If the frequency of the AC used is 50 Hz then the phase difference is equivalent to the time difference O 0 78 ms 0 7 8 ms O 0 25 ms O 2 5 ms 7 4

184 A particle is moving along a circular path of cale a with constant angular velocity w Magnitud displacement of the particle as a function of t is ytbals 1 a cosot to omil edt 16 ot of S 2 acos Vieunul 2 si lainosi imelo A wot

1 If Y K G are Young s modulus bulk modulus and shear modulus of elasticity respectively and o is Poisson s ratio then which of the following relations is correct 9 1 3 YKG 3 Y 2G 1 o 1 2 Y 3K 1 20 4 All of these

A cylindrical tube of cross sectional area A has two air tight frictionless pistons at its two ends The pistons are tied with a straight two ends The pistons are tied with a straight piece of metallic wire The tube contains a gas at atmospheric pressure P and temperature T If temperature of the gas is doubled then the tension inthe wire is Pressure outside cylinder P 0 To 2PO 2 1 4 PA 3 P A A A 2 P A 2 4 2P A PO 2 Po 2To

Two capacitors are connected of capacitance 2 F and 3 F in series The outer plate of the 2 F capacitor is connected to 1000 V source and outer plate of 3 uF is earthed The potential of inner plate of each capacitor is 300 V 500 V 600 V

Select the wrong statement 1 Work done by human heart per beat is 0 5J 2 The energy required to break one bond of DNA is 0 06eV 3 Work energy theorem is the scalar form of newtons second law 4 In a non elastic collision total kinetic energy after collision is always less than total KE before collision

0 and 20 The curve between potential en distance r between atoms of a diatomic molecule is shown in figure If FA FB FC FD and Faro B forces of interaction between atoms of molecule corresponding to points shown on curve then U A 1 169in d B C E 1 Fp FB FAI 2 FB 0

The spectral emissive power E for a body at temperature T is plotted against the wavelength and area under the curve is found to be A At a different temperature T the area is found to be 9A Then 2 2 1 3 IdE d 2 2 T T 1 2 1 3 ATTE P

Two parallel metal plates disconnected from battery having charges Q and Q face each other at a certain distance between them If the plates are now dipped in kerosene oil tank the electric field between the plates will Remain same Become zero Increase door

Two men start from origin at the same time Man A is moving speed V while B is moving towards Y direction with speed 3 V Find out the magnitude of the speed of the Man B with respect to man A A V B 2V C 3 V D None flowing with speed V The speed of swimmer is 3V with respect to river Find moving upstream

10 gm of ice at 0 C is kept in a calorimeter of water equivalent 10 gm How much heat should be supplied to the apparatus to evaporate the water thus formed Neglect loss of heat 1 6200 cal 313600 cal 2 7200 cal 4 8200 cal

The Young s modulus of a wire is numericall equal to the stress at which 1 Strain produced in the wire is unity 2 Length of wire gets doubled 3 Length increases by 100 4 All of these

The balancing potentiometer length for a cell is 560 cm in a experiment When an external resistance of 10 is connected in parallel to cell the balancing length change by 60 cm The internal resistance of cell in ohm is 1 6 1 4 1 2 1 0

Statement I The ferromagnetic property depends on temperature At high temperature ferromagnet becomes paramagnet Statement II At high temperature the domain wall area of a ferromagnetic substance increases In the light of the above statements choose the most appropriate answer from the options given below A Statement I is false but Statement II is true B Statement I is true but Statement II is false Both Statement I and Statement II are false D Both Statement I and Statement II are true

VB 56 A projectile is projected from the ground with spe 20 m s at an angle 30 with vertical The radius curvature of the path of projectile when velo makes 30 with horizontal is g 10 m s 2 15 4 m 1 8 5 m 3 26 2 m 4 32 6 m nanti

A multistage amplifier consists of three stages the voltage gain stages are 60 100 and 160 Calculate the overall gain in dB 11 964 10 dB 120 20 dB 12 020 10 dB 119 64 dB 1 1964 100 dB

4 If the river wa of rest then what was the displacement of swimmer 9 A man is moving with velocity V finds that rain is falling at an angle 45 with ver When man stops then he finds that rain falling vertically What is the speed of with respect to man A V B V 2 C 2V D None

2 A V A river is flowing with speed V The speed of swimmer is 3V with respect to river Find out the speed of the swimmer with respect to earth while it is moving upstream B 2V A V C 3V D None the cwimmer is swimming upstream then his