Physics Questions

2 In the circuit shown figure C luF and C 2uF Capacitor C is charged to 100V and C to volts After charging they are con nected as shown When the switches S S and S all are closed C 100 V C 20 V No charge will flow through S A charge magnitude 80 C will flow through S Acharge magnitude 40 C will flow through S Acharge magnitude 60 uC will flow through S

Point charge q 2 C and q 1 C are kept at 40 points x 0 and x 6 respectively Electrical potential will be zero at points 1 x 2 and x 9 2 x 1 and x 5 3 x 4 and x 12 4 x 2 and x 2 92 q 2 C 3 q 11 x 0 3tx x 6 fa git ut fera faga fava farfafura fara m 1 x 2 3x 9 2 x 13 x 5 3 x 4 3x 12 4 x 2 3tx 2

28 The reading of voltmeter S in the circuit as shown in figure will be 12 V 1 4 V 3 9 V 20 2 wwww 60 2 ww 30 2 S 2 6 V 4 10 V 33 34

Q 1 The given figure shows an inductor and resistance fixed on a conducting wire A movable wire PQ starts moving on the fixed rails from t 0 with constant velocity 1 m s A constant magnetic field B 2T exist perpendicular to the plane of paper The work done by the external force on the wire PQ in 2 second is L 2H Answer A B 00000000 C R 20 Your Attempt 16 J 32 J 48 J B 2T 2m P v 1m s Q Correct answer Rate this quest

A second order phase transition is one in which a the plot of entropy as a function of temperature shows a discontinuity b the plot of specific heat as a function of temperature shows a discontinuity c the plot of valume as a function of pressure shows a discontinuity d the plot of comprehensibility as a function of temperature is continuous

A uniformly charged ring of radius R has Q Electric field at axis of ring at distance from its centre is 1 2 3 kQ R2 2 KQ 3 3 R 3 kQ 8 3 kQ 16 R Teque 39 1 2 3 kQ R 2 KQ 3 3 R 3 kQ 8 R2 3kQ 16 R2 V fra Q R ga m

A longitudinal harmonic wave is travelling along positive x direction The amplitude wavelength and frequency of the wave are 8 0 x 103 m 12 cm and 6800 Hz respectively The displacement s versus position graph for particles on the x axis at an instant of time has been shown in figure Find the separation at the instant shown between the particles which were originally at x 1 cm and x2 3 cm separation in given in cm hs X

All surfaces are smooth and the system is released from rest The block 2kg slides down an inclined surface by 10m Then the horizontal displacement of A wedge is 2 3 7 C block 1kg is m 2 6 3 7 m B block 2kg is 3 5 7 D block 1kg is zero m 2kg 60 4kg 1kg 30 20

A particle performs SHM with a period T and amplitude a The mean velocity of the particle over the time interval during which it travels a distance a 2 from the extreme position is A a T B 2a T C 3a T D a 2T particle performing SHM to

A stone weighs 750 N in air and has an apparent weight of 250 N in water The buoyant force experienced by the stone is Select one O a 100 N b 250 N c 500 N

A particle is moving with constant speed v in xy plane as shown in figure The magnitude of its angular velocity about point O is ya 1 0 b of V a b vb 3 2 6 a 0 V 2 b 4 VIC X ON

9 5VWww 2 7mVww A 430 ID 1101924461 Vous 1101924461 NOTE SCREENSHOT PROHIBITED ID 1101924461 Adder Amplifier out put Voltage 48 8 mV

The commutator x P2 where x and Pare position and momentum operators respectively is d 2ihxP a 2i P b i P c 2ihxP A spin half particle is in the state S 2 The expectation values of 5 5 5 5 are giver

In 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 initial internal energy of the gas was 40 J what will be final internal energy 18 J 28 J 52 J 32 J

Q20 A solid sphere has the same mass and radius as a thin spherical shell The ratio between their moment of inertia about a diameter is O A B a 1 2 b 1 c 3 5 d 5 3 O C O D O Other 1 pc

A chain of mass m 4 kg and length 2 m rests on a rough horizontal surface such that some part of it hangs vertically when a small jerk is given the chain starts sliding down all by itself if the work done by friction till the chain slides of completely is 7 5 J then fraction of chain hanging initially is A 1 3 B 2 3 C 112 LD 14

Light is travelling from kerosene to air Its speed in kerosene is 2 08 x 108 m s Find the critical angle of kerosene air boundary Use nair 1 c 3x108 m s Select one a 43 9 b 40 8 c 50 1 0

An ideal gas is contained in a 3 5 L container at a temperature of 28 C If pressure is k constant what is the final volume of the gas if the temperature of the container is increased to 245 C Select one a 27 L b 7 2 L c 6 L

If a star has a parallax of 0 015 second of arc and an apparent magnitude of 8 how far away is it and what is its absolute magnitude distance pc absolute magnitude

26 In the given figure F 200 N m 20 kg m 25 kg g 10 m s Find the friction acting on the block of mass m Take g 10 m s 25 kg 20 kg m m M 0 5 1 125 N Z T 2 28 100 F 200 N 0 5 2 120 5 N 4 1232 N f f 2002 f

A liquid flows through two horizontal sections of tubing joined end to end In the first section the cross sectional area is 12 0 cm the flow speed is 250 cm s In the second section the cross sectional area is 2 50 cm Calculate the flow speed of the smaller section Select one O O a 12 cm s b 1200 cm s c 120 cm s

An object is acted on by the force shown in the figure 0 8 Z 0 6 Force F N 0 4 0 2 0 0 25 0 50 Position x m 0 75 1 00 a What is the final position of the object if its initial position is x 0 40 mm and the work done on it is equal to 0 21 J b What is the final position of the object if its initial position is x 0 40 m and the work

12 When an additional resistance of 1980 2 is connected in series with a voltmeter then the scale division reads 100 times larger value Resistance of the voltmeter is a 102 b 20 2 30 d 40 Q potentiometer circuit has been set w ance of a given cell The ometer wire he esistan b 7 9 Q d 6 9 Q the potentiome V cm is

The specific gravity of glass is 4 28 Its density is equal to Use Density of water 1 0 103 kg m Select one O a 4280 kg m O b 428 kg m c 4280 g m

5 A solid ball is fully immersed in a liquid contained in a cylinder The radius of cylinder is R A piston weightless is placed on the liquid surface If a pressure is applied on the liquid by a weight W placed on the piston then the fractional change in radius of ball is x Then the bulk modulus for the material of ball is given that x 1 2 1 W R X W 3 R x

A virtual erect and magnified image of a real object can be formed by A Plane mirror B Concave mirror C Convex mirror D Concave lens E Convex lens The correct option is A C and D B and E C and E A B and E

Retraction of light through a triangular glass prism is shown in figure The angle of incidence angle of emergence and angle of deviation are represented by respectively for y x Z y z p y p z x p y

Consider a uniform solid sphere of charge Q and radius R What is the electrostatic potential energy stored in the region O r R where r represents distance from centre of the sphere 1 Q 4 R 2 Q 10 R

Two identical cells connected in series send 10 A current through a 50 resistor When they are connected in parallel they send 8 A current through same resistance What is internal resistance of each cell 2 5Q 10 O 1 50

If an object is placed at a distance of 30 cm from a lens a virtual image is formed If the magnification of the image is find the position of the image and the focal length of the lens Also find the nature of the lens 3

16 An astronaut orbiting the earth in a circular orbit 1000 km above the surface of earth gently drops a ball out of spaceship The ball will Fall vertically down to the earth 2 2 Will remain stationary at the point of release 3 Will move along with the spaceship 4 Will move randomly in any direction

The system shown in figure is in equilibrium Masses m and m are 2 kg and 2 5 kg respectively Spring constants K K and K are 200 Nm 1000 Nm 500 Nm respectively If the elongation in spring A is 20 cm and the compression in spring C is 1 cm then find out the elongation in spring B in cm K Imm m K K

The incorrect statement among the following is 1 Sunlight is not always required for a solar cell 2 Semiconductors with band gap close to 1 5 eV are ideal material for solar cell fabrication 3 A solar cell works when it is reversed biased 4 I V characteristics for solar cell is drawn in fourth quadrant

Given a wave with the dispersion relation w ck m for k 0 and m 0 which one of the following is true a The group velocity is greater than the phase velocity b The group velocity is less than the phase velocity c The group velocity and the phase velocity are equal d There is no definite relation between the groun velocity and the pho

A flywheel of mass 50 kg and radius of gyration about its axis of rotation of 0 5 m is acted upon by a constant torque of 12 5 N m Its angular velocity at t 5 s is 2 rad s 5 rad s O 10 rad s 12 rad s

An electromagnetic wave is propagating in free space in the z direction If the electric field is given by E cos t kz i where oot ck then the magnetic field is given by a B 1 c cos t kz j b B 1 c sin wt kz j c B 1 c cos t kz i d B 1 c cos t kz j

For a particle projected from horizontal surface the ratio of range to maximum height reached is 0 is angle of projection with vertical 1 4 tane 3 tan 0 4 24cote R u jin20 cot 0 4 4 g 4 sin g

Q18 The radius of gyration of a 1 point disc of mass 100 gm and radius 5 cm about an axis passing through its centre of gravity and perpendicular to the plane is a 0 5 cm b 2 5 cm c 3 54 cm d 6 54 cm O A B O C O D

A charge particle having charge 2 C is thrown with velocity of 21 31 m s inside a region having 2 N C and magnetic field 5k T The Lorentz force acting on particle is 30i 16 N C 15i 20 N O 15i 30j N

Solvelancer Test A and starts from rest and moves with acceleration ratio 49 If dince covered by A is 25 of distance covered by then find the ratio of time required by and A Solvelancer Test n 3 4 6 4 3 c 2 3 d 3 2 a b d

Bullets of 0 03 kg mass each hit a plate at a rate of 200 bullets per second with velocity of 50 m s and reflect back with velocity of 30 m s The average force acting on the plate in newton is 120 180 480 245

Question No 8 Single Correct A A A rocket is launched upward with an acceleration of 5 m s2 initial velocity is zero after 30 seconds its fuel is finished then find total time taken t it to reach the maximum height from ground 30 seconds 60 seconds 45 seconds 90 seconds Marks 4 00

Q19 A thin uniform circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to the plane with angular velocity D Another disc of same mass but half the radius is gently placed over it coaxially The angular speed of the composite disc will be a 5 4w b 4 5w c 2 5w d 5 2w O A O B O C O D O Other 1 po

In the equation of angular displacement of a particle moving on a circular path is given as 0 2t 0 5 0 is in radian and in second The angular velocity of the particle at t 2 s is 16 5 rad s 19 5 rad s 24 rad s 12 rad s

Question No 21 Single Correct A A If particles of mass 1 kg 2 kg and 3 kg are placed at 1 0 1 2 2 3 and 1 3 0 Position of the centre of mass of the system is D 311 2 5 6 5 28 6 3 4 4 2 8 6 6 6 None

The equation of particle executing simple harmonic T motion is x 5m sin s t Write down 3 the amplitude time period and maximum speed Also find the velocity at t 1 s

10 A rod with non uniform density is placed along x axis such that the end A of the rod is at the origin If the density of the rod increases as we move away from the origin then I and I rep resent the moment of inertia of the rod about A end points A and B 1 I IB LA 2 I IB 3 IA IB 4 None of these

Question No 15 Single Correct A A B C Fixed 37 777 For the given arrangement find force of friction on the block D 24 N 4 kg 12 8 N 4N 12 N 0 4 A

In the figure shown sound waves A and B both of A wavelength are initially in phase and travelling rightward as indicated by the two rays Wave A is reflected from four parallel surfaces but ends up travelling in original direction The possible value s of distance L in terms of wavelength in figure which put A and B exactly out of phase with each other after all the reflections is are A 2 2 C 32 4 B 32 2 D 2 mih B

Two spherical bodies having masses M and 3 M and radii r and 4r respectively are released in free space from rest such that the initial separation between their centres is 13 r If only force is gravitational attraction the distance covered by the smaller body just before collision is 1 6r 2 2r 3 13r 4 4 39r