Physics Questions

13 Very small pollen grains are suspended in water A bright light shines from the side When looked at through a microscope small specks of light are seen to be moving in a rando jerky manner pollen grains in water eye microscope What are the moving specks of light pollen grains being hit by other pollen grains pollen grains being hit by water molecules bright light A B C water molecules being hit by other water molecules D water molecules being hit by pollen grains

Condition of charging and indicate the direc and electrolyte Q10 Define current density Write it s relation with electric field Q11 Using Krichoff s law determine current through each rocintor

In the following circuit the resistance of a 31 voltmeter is 10 0002 and that of an ammeter is 2002 If the reading of ammeter is 0 1A and that of voltmeter is 16 volt then the value of R is 1 1200 3 1180 4 12 4802 R ww 2 1000 4 1400 3 6 240 4 12 480 A fangen af 10 0000 2002 0 1 ofrer den alcenter a 48415 16 alez R 1 R www 1 1200 3 118Q 2 100 0 4 1400

of this cell is OT Q13 Derive condition for balanced wheatstone bridge condition Paragraph Q14 Electrons in a conductor are moving randomely due to thermal energy this making it s average velo with drift velocity

2 A series circuit of R 14 4 Ohm L 0 127H draws a current of 4 6 amp when connected to an alternating voltage source of 230V Find frequency of supply in Hz calculate active power reactive power and apparent power

A particle of mass as an electron 1 mg has the same wavelength moving with a velocity of 3 x 106 m s 1 The velocity of the particle is mass of electron 9 1 10 1 kg 1 2 7 x 10 21 m s 1 3 9 10 2 m s 1 X AIPMT Prelims 2008 2 2 7 x 10 18 m s 1 4 3 x 10 31 m s 1

Two wires of the same material and length are stretched by the same force Their masses are in the ratio 3 2 Their elongations are in the ratio Question Type Single Correct Type 13 2 2 9 4 3 2 3

1 27 A 2 54 A 3 108 A 4 054 A 9 A hollow cylinderical wire carries a current 1 having inner and outer radii R and 2R respectively Magnetic field at a point which 3R 2 distance away from its axis is 1 3 2 0 18TR 5 I 2 4 Hol 36 R 5 ol 9TR

A truck blowing horn of frequency 500 Hz travels towards a vertical mountain and driver hears echo of frequency 600Hz If velocity of sound in air is 340m s then speed of truck is 1 31 m s 2 41m s 3 51m s 4 21m s

A 1 00kg block is attached to a spring with a spring constant of k 30N m that is hanging from the ceiling The bottom of the block is then attached to a second spring with a spring constant of k 20N m that is attached to the floor When the two springs are unstretched there is a gap of 50cm between the end of the spring hanging from the ceiling and the end of the spring that is attached to the floor The potential energy function for this block is U mgx 1 2 k1 x 1 2 kz x 0 50m where x is the position of the block above the bottom of the spring that is attached to the ceiling when it is unstretched 1 What is the value of x that is the equilibrium position for this block

A rod non uniform mass distribution The mass increases from left end A to right end B It is easiest to rotate the rod about an axis ATTIT y Question Type Single Correct Type 1 Passing through A 2 Passing through B

A body at temperature 00 having Newton s cooling constant K is placed in a surrounding having temperature To at time t 0 The graph of temperature of the body as a function of time t is shown in the adjacent figure A tangent on the curve is drawn at t 0 as shown in the figure Find the value of T temp 1 K 2 1 K To Question Type Single Correct Type 3 K 00 To T time

21 Consider the following charged suspended ball 21 system If a B then the statements which can be true at equillibrium out of followings A a Q Q b Q Q c Q Q d Q Q 1 Only d 3 c d m m m m m m m m m m 2 Only c 4 b d faferfera frafa afera e faremo farem fa af at exa a Q Q b Q Q c Q Q d Q Q 1 d 3 c d A m m m m m m m m m m 2 dec 4 b d

In an oscillation of L C circuit the maximum 38 charge on the capacitor is Q The charge on the capacitor when the energy is stored equally between the electric and magnetic field is ON 1 f 2 3 olm 4 3 200 W L Caff a faga aga fer 1 f 4 2 3 ok

Two identical capacitors each of capacity C are charged upto same potential V Now their oppositely charged plates are connected together then calculate the a energy of each capacitor before connection b potential of each capacitor after connection c charge of each capacitor after connection d energy stored in each capacitor after connection e energy loss in the form of heat

b The graph in Fig 5 1 shows the variation of temperature with time for a substance that is initially liquid temperature A B time Fig 5 1 i State what is taking place at points A B and C You should say what changes of state if any are taking place point A point B point C

5 On a moving vehicle you want to drop a ball into a drown circle on road such that it remains there even after few bounces When should you throw the ball aiga uz i ct 34 CRE ARHIA H ch Uz ych d gy m a RAT HO COM 241 dig Hit ast Ball Velocity Launch Point Vehicle Velocity

40 A long solenoid has 1000 turns when a current of 4A flows through it the magnetic flux linked with each turn of the solenoid is 4 x 10 wb the self inductance of the solenoid is b 4H a 1H 0 3H

Orbit Speed Kepler s Second Law Set your planet at x y 100 0 as before and choose a y velocity 30 35 units la velocity Describe the speed of the planet as it moves around the orbit Where is the pl When is it moving slowest Circular motion velocity of the planet

A 0 012 kg sample at its melting point of liquid gallium metal is added to 50 0 g of water in a polystyrene Styrofoam calorimeter The temperature of the water changes from 24 0 C to 27 8 C as the gallium solidifies Calculate the molar enthalpy of solidification for gallium 5 Marks

Att 0 a wire loop in the shape of a right angled isosceles triangle PQR of side lengths QR RP a moving with constant speed v enters a region with a uniform magnetic field of strength B in a direction perpendicular to the plane of the loop The induced emf in the loop at t is N Bav Then the value of Nis a 5v R 013

A particle A having a charge of 4 x 10 6 C and a mass of 600 g is fixed at the bottom of a smooth inclined plane as shown Another particle B of same mass and charge is placed on incline such that it remains in equilibrium Then dis B 1 2 1 m d 37 2 0 2 m 2

0 Two periodic waves of intensities I and 1 pass through a region at the same time in the same direction The sum of the maximum and minimum intensities is a c I I b 2 1 1 d 2008

2 b a In a potentiometer of 10 wires the balance point is obtained on the 7th wire To shift the balance point to 9th wire we would a decrease resistance in the main circuit b increase resistance in the main circuit c decrease resistance in series with the cell whose emf is to be measured d increase resistance in series with the cell whos emf is to be determined

g block is 3 meters from a light spring The coefficient of kinetic friction between the floor and the block is 0 25 the coefficient of friction is the same on the entire surface The block has a of 3 m s when it hits the spring that has a force constant of 50 N m The block comes to rest when it has compressed the spring a maximum distance d Find 1 The speed of the object at the beginning of the 3 meters 2 The value of the maximum compression d

In the figure the value of resistors to be connected between C and D so that the resistance of the entire circuit between A and B does not change with the number of elementary sets used is A Be R 1 R R R ww ww 3 3 R ww R 2 R 3 1 RE R ww R R R R ww ww R D

Electric field inside the given capacitor with dielec material is k Find charge density a on the plates Given E 6 10 V m k 6 183 10 C m 3 18x10 G m b 81 10 C m d 3 18 10 C m

Phy Section This section contains 15 SINGLE CORRECT TYPE questions Out of these 15 questions candidate can choose to attempt any 10 Two spheres A and B of exactly same initial mass are given equal positive and negative charges respectively Their masses after charging Remains unaffected Read More O Mass of A mass of B Mass of A mass of B Nothing can be said

A ray of light is incident at the glass water interface at an angle i such that it emerges finally parallel to the surface of water The refractive index of water is increased by adding some impurity The angle of incidence in glass will Air increase water 2 decrease Glass Question Type Single Correct Type 1 r 3 remains same w 4 3 C

f COLUMN I B P A P P P C P R R R q S f and R variable resistance p 9 r COLUMN II R sh E E M R st E r 5 M r 5Q R sh r 32 R s R 0 R 392 R 5 Q R 59

30 24 AL 7 Marginal Willingness to Pay 24 Using the above information and graph complete the below statements filling in your final complete answer in the space provided to the right of the statement Do not show your work or calculations A BI a The marginal willingness to pay of the 5th unit of this product is equal to b The total willingness to pay for 5 units of this product is equal to c The value of 5 units of this product is equal to MWTP d If P MWTP of the 5th unit total expenditure this product is TH 54

ALLEN In an AC circuit V and I are given by 39 V 150sin 150t V and 1 150 sin 150t A A The power dissipated in the circuit is 1 Zero 2 5625W 3 150W 4 106W V 150sin 1501 V 1 150 sin 150t A 1 Zero 2 5625W 3 150W 4 106W

Consider the wavelength of the light is 383 nm The photo electrons are emitted from the surface of the specific metal when the light is falling on its surface Calculate the maximum kinetic energy of these electrons when the work function of the metal is 1 50 eV A 3 5 eV B 2 36 eV C 1 36 eV D 1 74 eV Answer

The cylindrical filament of an incandescent lamp of power 64 W is made of Tungsten The operation temperature of the lamp is 2000K Consider the filament a black body and find its radius in mm Given o 6 10 8 W m length of 10 filament is 37 cm

11 An air column closed at one end and open at the other resonates with a tuning fork when the smallest X length of the column is 50 cm The next larger length of the column resonating with the same tuning fork is 2016 1 a 66 7 cm c 150 cm b 100 cm d 200 cm

Determine the angular momentum of a 70 g particle about the origin of coordinates when the particle is at r 4 3 m y 5 8 m and it has velocity 3 11 8 4k m s th Find the ar component Express your answer using two significant figures VAE DOCE

5 37 A hollow sphere of radius r is rotating about a horizontal axis at some angular speed oo It is gently lowered to ground and the coefficient of friction between sphere and the ground is How far does the sphere move before it starts pure rolling 2 2 2 wor Ans 5 25 119

A conducting frame is placed in a horizontal plane as shown in the figure The two sides are parallel and separated by a distance of 0 25 m A massless conducting rod can slide without friction on the frame The total resistance of the circuit is 40 Q The rod is connected to a 0 2 kg mass by a massless cord which passes over a massless and frictionless pulley uniform A magnetic field of 2 T points vertically upward The voltage of the battery is 100 V Find the constant velocity in m s with which the rod and mass eventually move 40 2 100 V B 2T 0 2 kg 0 25 m

When two charged particles are placed at the certain distance apart in vacuum then the force experienced by one of the charges is equal to F If vacuum is replaced by a medium of dielectric constant 6 then the net force experienced by the charged particle will be equal to

The diagram shows two co planar conducting loops whose centres coincide If R then the mutual inductance will be 0 14012 4R O MOR 21 O H40 2R TULO 12

A thin plate separates two liquids of coefficients of viscosity n and 4n kept between two fixed plates as shown If plate has to be pulled by applying d minimum force then d is F 1 Question Type Single Correct Type 1 2 2 00 3 3 d d

Three charges are positioned as follows 91 2 at A 3 1 0 92 2 at B 1 3 0 93 at C 3 3 0 Assuming that the charges are static and fixed in space what should the charge q3 be so that the electric field intensity at 0 0 0 is zero E

2 3i j 4 1 6i 2j 3 6i 2j Two particles of masses m and 2m with charges 34 24 and 2q are placed in a uniform electric field E and allowed to move for the same time The ratio of their kinetic energies will be 1 2 1 2 8 1 3 4 1 4 1 4 1 3i j 3 6i 2j 2 3i j 4 1 6i 2j 2 2q8 afa sura ya ats fear and at gre fre a farma 1 2 1 2 8 1 3 4 1 4 1 4

9 A solenoid at 1 5 metre length and 4 0 cm diameter posses 10 turn per cm A current of 5 ampere is flowing through it The magnetic induction at axis inside the solenoid is 1 2 x 10 Tesla 2 2x 10 Tesla 3 4x 10 Gauss 4 2 x 10 5 Gauss 4

Read More The magnetic force acting on a charged particle having charge 2 C in a magnetic field of 2 T acting in y irection moving with velocity 21 3 x 106 m s is O4 N in z direction O 8 N in y direction O 8 N in z direction O 8 N in z direction

25 E x graph for the uniformly charged ring will be 25 E on y axis 2 X LEADER TEST SERIES JOINT PACKAGE COURSE 32844 XX Ey 0999DMD310320001

32 A parallel plate capacitor of capacitance 90pF is connected to a battery of emf 20 5 V If a dielectric material of dielectric constant x 3 plates the magnitude of the induced charge will be a 1 2 nC b 0 3 nC c 2 4 nC is inserted between the d 0 9 nC

m m 3 Now a new block with mass m 16 2 kg is attached to the first block The new block is made of a different material and has a greater coefficient of static friction What minimum value for the coefficient of static friction is needed between the new block and the plane to keep the system from accelerating

16 4 2Q Assume that lamp radiates power P uniformly in 43 all directions The magnitude of electric field strength at a distance r from the lamp is P P 1 2 2ncer 3 P 3 4 2Q 1 stionpaper P CEOT P 2 P fayda P 2nceor

6 53 A body is projected vertically upwards from the surface of earth with a velocity sufficient to carry it to infinity Calculate the time taken by it to reach height h 3 2 2R ARE 1 4 1 Ans 1 3 g R