Physics Questions

The figure shows four identical conducting plates each of area A The separation between the consecutive plates is equal to L When both the switches xV A Find the value of x Treat symbols as having are closed then q L usual meaning 4V 9 O

4 3 76 S2 A compass is placed between the platesc charging capacitor then its deflection will 1 Be zero always 2 will be non zero always 3 will become zero at steady state 4 None

A wave is propagating in a medium of dielectric constant 2 and relative m permeability 50 The wave impedance a medium is 1 5 Q 3 1883 N 2 376 6 S 4 3776 Q the

2 12 A circular current loop of magnetic moment M is in an arbitrary orientation in an external magnetic field B The work done to rotate the loop through 45 about an axis perpendicular to its plane is a zero b 3MB 2 MB c 2 d 2MB

spring of force constant k and a block of mass m If the block is slightly displaced vertically down from its equilibrium position and then released the period of its vertical oscillation is fea ya fiera an quan fad ya una farci yen fein foren a gen af g a A B C D facenfura a visi m 2 0 K R 47 m 4K K m

1 and 2 14 Figure shows the variation of i with oo in a m 1 0 in A 0 5 0 0 FG 11 00 0 5 1 0 1 5 rad s 1 R L C circuit 3 R C circuit 2 0 2 R L circuit 4 None of these

When a high frequency current is passed through a coil which surrounds the metal the generated in metal produces sufficient to it 1 induced emf low 2 induced current low 3 eddy current high 4 mechanical energy high temperature freeze melt melt freeze

A metal sheet with a circular hole is heated The hole 1 Gets larger 2 Gets smaller 3 Remains of the same size 4 Gets deformed EXERCISE stant volume gas thermometer shows pressure reading of 50 cm and 90 cm of mercury at 0 C and 100 ctively When the pressure reading is 60 cm of mercury the temperature is 5 C 2 40 C 5 C 4 12 5 C

Consider a point A far away from short dipole p By keeping r constant 0 varies from 0 to 360 Variation of potential of dipole at A with respect to 0 A 1 0 3 0 360 360 0 2 0 4 0 0 360 0 360

Equation sin cot implies that the 12 dt equation for i t the current as a function of time must be such that di 1 its slope is a sinusoidally varying quantity dt with the same phase as the source voltage 2 an amplitude given by 3 Both 1 and 2 4 Neither 1 nor 2

1 2 8 A metallic vessel of negligible heat capacity contains 0 5 kg of water of specific heat capacity 4200 J kg K It is heated from 15 C to 85 C by a 750 W immersion heater in 4 minutes The average loss of heat in watts to the surroundings from the vessel during this time is nearly 1 70 2 123 3 138 4 212

The X X bond length is 1 5 and Y Y bond length is 1 48 If electronegativity values of X and Y are 3 and 3 5 respectively then Y X bond length would be 1 1 44 A 3 1 75 A 2 0 98 A 4 0 73 A

Consider the following statements regarding the real images formed with a converging lens Real images can be seen only if the image is projected onto the screen The real image can be seen only from the same side of the lens as that on which the object is positioned I II III Real images produced by converging lenses are not only laterally but also longitudinally inverted as with mirrors Which of the above statement statements is are incorrect A Only I and III B All three C None D Only II

1 5 7 10 C 2 0 63 10 PC 3 1 9 10 c 4 16 1 x 10 rc Ratio among linear expansion coefficient c area expansion coefficient B and volume expansion coefficient y is 1 1 2 3 3 4 3 2 2 3 2 1 4 All of these

3 A projectile of mass m is fired with velocity from a point as shown in figure neglecting air resistance what is the change in momentum when leaving from P and arriving at Q 30 P 1 Zero 01 AV 2 mv AY 2mv Q

A ball of mass 3 kg is moving at speed of 20 ms makes a head on collision with an identical ball at rest The kinetic energy of the ball is 3 4 th of the original The coefficient o restitution is 1 IN 2 13 1 1 1

A man has a mass of 78 0 kg What is his weight on Earth 764 N You are correct Previous Tries Your receipt no is 161 3011 What would he observe his weight to be if he is accelerating vertically in a spaceship at 2g far from gravitational influences

A milli ammeter of range 10 mA and resistance 9 Q are joined in a circuit as shown in the figure The meter gives full scale deflection when current in the main circuit is I and A and D are used as terminals The value of I is A A B www 0 192 C B 1 09 A 10 9 A zero 0109 A wwww 0 3 C wwww 0 62 D 0 992 E Correct Answer

A metal sphere weighs 200 gram in air and 170 gm in water Then find the volume of cavity in cc in metal sphere If Pmetal 8gm c c Pwater 1m c c Answer

Same current is flowing in two alternating 2 circuits The first circuit contains only inductance and the other circuit contains only a capacitance If the frequency of the e m f of A C is increased the effect on the value of the current will be 1 increase in the first circuit and decrease in the other 2 increased in both circuits 3 decrease in both circuits 4 decrease in the first circuit and increase in the other Non resonant circuit what will be the nature of

A force F acting on an object varies with distance x as shown here The work done by the force in moving the object from x 0 to x 6 m is W J find value of 2W F N 321 2 0 3 Answer 20 08 6 x m 01 02 03 04 05 06 07 09 20 01 02 03 04 05 06 07 08 09

A zinc ball of radius R 1 cm charged to a potential 0 5 V The ball is illuminated by a monochromatic ultraviolet UV light with a wavelength 290 nm The photoelectric threshold for zinc is 332 nm The potential of ball after a prolonged exposure to the UV is A 0 5 V B 0 V C 0 54 V D 0 79 V

lonized hydrogen atoms and a particles with same momenta enters perpendicular to constant magnetic field B The ratio of thei radii of their paths will be 1 2 1 3 4 2 1 2 4 1 4

Body A of mass 4m moving with speed u collides with another body B of mass 2m at rest The collision is head on and elastic in nature After the collision the fraction of energy lost by the colliding body A is 1 3 1 9 4 9 2 4 8 9 5 9

The density of liquid contained in the tank of area 0 5 m is 1200 Kg m It has a hole of area 1 cm near the bottom A load of 30 Kg is applied on the liquid at the top Find the velocity of efflux when the height of liquid level is 75 cm above the bottom g 10 m s 30Kg h A B C D 0 4 m s 8 m s 12 m s 16 m s 2 Correct Answer

Sec 6 3 Consider a block with a mass of 1 82 kg that is tied to the end of a rope R 5 34 m long The block moves in a circular ortit on a frictionless horizontal surface see figure If the maximum tension that the rope can withstand without breaking is 48 2 14 the maximum tangential velocity that the mass can have will be approximately R 6 18 m s 11 89 m s O 61 84 m s 1 19 m s

n the given circuit a charge of 80 C is given to the left plate of 4 F capacitor Then in steady state energy stored inside 2 F capacitor will E 2 F 80 C 4 F O100 J O200 J O 150 J 3 F

WTON S LAWS Two masses M and M are connected to the ends of a string passing over a smooth pulley The tension in the string is T and the masses are moving with acceleration a If the masses are interchanged then A both a and I will change B a will change but T will remain unchanged C T will change but a will remain unchanged D none of them will change

1 Two bodies of mass 4 and 6 kg arc attached to the ends of a string passing over a pulley A 4 kg mass is attached to the table top by another string The tension in this string T is A 19 6 N B 25 N T 4 kg T T 6 kg C 10 6 N D 10 N

If A 21 3 and B 51 7 then the vecto having the magnitude of A and direction of B would be 1 2 1 74 21 33 2 74 5 7 direction of B 13 Vector 51 71 4 5 13 i 7 13 3 13 1 2

A 56 0 g toy car is released from rest on a frictionless track with a vertical loop of radius R The initial height of the car is h 4 a What is the speed of the car at the top of the vertical loop Use the following as necessary R and g x V b What is the magnitude of the normal force acting on the car at the top of the vertical loop N

The energy band diagram of a semiconductor material is shown in figure C B V B The semiconductor is of n type E p type Intrinsic type Data is insufficient

The physical quantity electric potential V has dimensions M LbTCA and capacitance C has dimensions MSLITSA Then a b c d ef g his Answer

1 23 points An electron has an initial speed of 6 2 x 106 m s at point A The electron moves from point A and stops at point B Find the potential difference VA VB between the two points in volts

A circuit is made up of resistance 3 0 and inductance 0 01 H An alternating emf of 100 V at 50 Hz is connected then the phase difference between the current and the emf in the circuit is tan tan tan 76 3 TE 7 2

32 A bar magnet of magnetic dipole M 51 A m is placed in region of magnetic field B 21 31 4k tesla the magnitude of torque EY les acting on magnet is C MX B 1 Zero 2 10 Nm 3 15 Nm 4 25 Nm

A liquid dose containing radioactive substance x is scheduled to be prepared at 9 AM and 1 ml of it is given to a patient at 10 30 AM If patient gets late and takes the dose at 11 15 AM how much quantity of dose should be given to patient Half life of x is 90 min A 4 ml B 1 41 ml D 2 82 ml C 2 ml

Two large parallel sheets charged uniformly with surface charge density o and o located as shown in the figure Which one of the following graphs shows the variation of electric field along a line perpendicular to the sheets as one moves from A to B A B 0 AX 0 be X B

An air bubble in sphere having 4 cm diameter appears 1 cr from surface nearest to eye when looked along diameter aHg 1 5 the distance of bubble from refracting surface is A B C D 1 2 cm 3 2 cm 2 8cm 1 6 cm My Answer

A solid sphere rolling on a rough horizontal surface with a linear speed v collides elastically with a fixed smooth vertical wall The speed of the sphere after it has started pure rolling in the backward direction is A B C D 2v 7 3v 7 Zero Correct Answer

13 The phase of a particle in SHM at time t is 1 6 The following inference is drawn from this 1 The particle is at x a 2 and moving in X direction 2 The particle is at x a 2 and moving in X direction 3 The particle is at x a 2 and moving in X direction 4 The particle is at x a 2 and moving in X direction

The time period of a body undergoing simple harmonic motion is given by T p DSC where p is the pressure D is density and S is surface tension The values of a b and c respectively are A 1 2 3 2 B 3 2 1 2 1 C 1 1 2 3 2 D 3 2 2 1

Attempt All 35 questions The length and breadth of a rectangle are 5 5 0 1 cm and 2 5 0 1 cm Calculate area of the rectangle with error limit A B C D 13 0 8 cm 14 0 8 cm 13 0 6 cm 14 0 6 cm Correct Answer

If an inclined plane is made slowly horizontal by reducing its inclination with horizontal the component of weight parallel to the plane of block resting on the inclined plane A remains same B increases C decreases D first increases and then decreases

A steel tank contain 300g of ammonia gas at pressure 1 35 106 Pa and temperature 77 C If some gas is removed from tank and temperature reduced to 27 C then pressure is 8 7 105 Pa Then find amount of gas leaked A B C 225 56 g 74 44 gm 200 g 70 Correct Answer

Note All questions are compulsory Each question carry 1 mark 1 The mathematical expression of density is Density mass volume Density mass x volume a b C d Density area x mass Density volume x weight 2 Density of water in SI system is 3 1000 b 100 c 10 d 1 3 If the density of object is more than water it will Float on water a b Sink in water c d Neither floats nor sinks Both a and b 4 Which physical quantity is measured in dyne centimetre Torque Moment of force a b c Turning effect of force d All of the above 5 If the perpendicular distance between fixed point and poin of application of force increases the moment o force a Increases b Decreases c Remains same d None of these 6 The SI unit of pressure is a Newton metre b Dyne centimetre c Pascal d None of these 7 A force of 10 N acting on a body causes a displacement of 2m in its own direction The work done by the force is a b c 5 joule d 0 joule 10 joule 20 joule 8 If the mass of the body is doubled the kinetic energy will be a Same b Halved c Doubled d Four times 9 Force applied on a wall of the room results in a Negative work done b Zero work done c Both a and b d None of these

A particle is suspended from a fixed point by a string of length 5m It is projected from the equilibrium position with such a velocity that the string slackens after the particle has reached a height 8m above the lowest point So height the particle can rise further A B C D 0 80 m 0 96 m 96 m 0 48 m Correct Answer

30 A U shaped wire having current i is place of magnetic field as shown in figure the magnetic force acting on wire is 41 1 r 21 Bi 3 2Bir Exi 2 r 21 Bi 4 2Bil Road Office

05 Three equal weights A B C of mass 2 kg each are hanging on astring passing over a fixed frictionless pulley as shown in the figure The tension in the string connecting weights B and C is A zero B 13 N C 3 3 N D 19 6 N

The energy gap of an element is given as 5 9 10 ev Calculate the intrinsic com length if 1 5 82 10 m s n 5 0 mm b 1 2 m c 9 5 mm d 2 1 m Answer 8 question 3 e ec D