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# Bansal classes physics study material pdf Author: JANINE SWIETONIOWSKI Language: English, Spanish, Arabic Country: Sri Lanka Genre: Politics & Laws Pages: 556 Published (Last): 27.10.2015 ISBN: 721-3-48672-647-8 ePub File Size: 26.85 MB PDF File Size: 14.33 MB Distribution: Free* [*Regsitration Required] Downloads: 33808 Uploaded by: DEAN

Find the maximum height reached by it during its subsequent motion above point of release. Calculate i the final velocity ofthe combined mass after collision ii the amount of heat liberated in the collision. The plates of the capacitors are connected as shown in figure with one wire from each 2nF capacitorfree. The 1. Current of 2 A is passed through the coil.

Bodies 2 and 3 are initially uncharged. Then, body 2 is removed from body 1 and touched with body 3, and then removed. Another condenser B has a capacity 1 pF with air between the plates. Both are charged separately by a battery C of V.

After charging, both are connected in parallel without the battery and the dielectric material being removed. Capacitor 2 contains a dielectric slab of dielectric constant k as shown. When the gap between the plates is filled with a dielectric, a charge of pC flows through the battery. The dielectric constant of the material inserted is: C 3 D none. The ratio of heat generated to the final energy stored in the capacitor will be A 1.

Another capacitor of capacitance 2C is similarly charged to a potential difference 2V. The charging battery is now disconnected and the capacitors are connect in parallel to each other in such a way that the positive terminal of one is connected to the negative terminal of the other. The two capacitors are then connected in a single loop, with the positive plate of one ; connected with negative plate of the other.

What heat is evolvecl in the circuit? The battery is then disconnected and the charged plates are now connected in a system as shown in thefigure. The system shown is in equilibrium. All the strings are insulating and massless. The magnitude of charge on one ofthe capacitor plates is: C VmgA D 0. Ifthe sphere is 0. The ratio ofthe radii of the spheres being n then the I- n-1 capacitance of such a sphere will be increased by a factor n n-1 A n B n-1 C -' n D a.

They are combined in series. What maximum voltage will the system of these two capacitor withstands if they are connected in series? The ratio — is: What should be the maximum value of the external emf source —H H. First of allfindout the break down voltages of each branch. After that compare them. Inner and outer shells are connected to each other. The capacitance across middle and inner shells per unit length is: The switch S has been closed for long IkSl time so as to charge the capacitor.

When switch S is opened, the ikn capacitor discharges with time constant A 33 ms B 5 ms C 3. When switch S is opened, the capacitor discharges with time constant. LAWvH t. A is constant c B increases with increase in time t C decreases with increase in time t D firstincreases then decreases Q. Each resistance is of 3Q. Ifthe charge on the capacitor 5. An identical capacitor B of capacitance C with air as dielectric is connected to voltage source 0. The charge 0. A discharged capacitor ofcapacity 1.

C chargeflowsthrough Afromrightto left. D chargeflowsthrough Afrom left to right. Ifthe switch S is closed. C the amount of chargeflowingthrough the cell will be CE. After closing the ——11 12V 2. D The potential drops across C is greater than that across C, 2. When a dielectric plate is introduced between the two plates then: A some charge from the capacitor willflowback into the source. B some extra charge from the source willflowback into the capacitor.

C the electricfieldintensity between the two plate does not change. D the electricfieldintensity between the two plates will decrease. The capacity ofthe capacitor after the introduction ofthe copper sheet is: A minimum when the copper sheet touches one of the plates. B maximum when the copper sheet touches one of the plates. C invariant for all positions of the sheet between the plates. D greater than that before introducing the sheet.

Initially the capacitor is completely uncharged and the switch S is 3. A The current through resistor R at the moment the switch closed is zero. B The current through resistor R a long time after the switch closed is 5 A. D The maximum charge on the capacitor during the operation is 5pC.

Later one of the parameters i. V, R or C is changed keeping the other two constant, and the graph 2 is recorded. A Both the capacitors are charged to the same charge. B The emf s of cells in both the circuit are equal. C The emf s of the cells may be different. D The emf E is more than E t 2. The battery is disconnected and the plates of the capacitor are pulled apart to make the separation between the plates twice.

Again the capacitor is connected to the battery with same polarity then A Chargefromthe batteryflowsinto the capacitor after reconnection B Chargefromcapacitorflowsinto the battery after reconnection. C The potential difference between the plates increases when the plates are pulled apart. D After reconnection ofbattery potential difference between the plate will immediately becomes half of the initial potential difference.

Just after disconnecting the battery Q. Now a dielectric of dielectric constant K is inserted tofillthe whole space between the plates with voltage source remaining connected to the capacitor. A the energy stored in the capacitor will become K-times B the electricfieldinside the capacitor will decrease to K-times C the force of attraction between the plates will increase to K -times 2. D the charge on the capacitor will increase to K-times Q.

The potential drop across the 7 pF capacitor is 6 V. Then the: B Voltage across capacitor Cj is 5V. C Voltage across capacitor C is 10 V 2.

D Energy stored in capacitor C. Now if the capacitor plates are brought close slowly by some di stance: This region is nowfilledwith a dielectric slab of dielectric constant k. The capacitor is connected to a cell of emf E, and the slab is taken out A charge CE k - 1 flows through the cell B energy E C k - 1 is absorbed by the cell. C the energy stored in the capacitor is reduced by E C k - 1 2. They are connected in parallel with oppositely charged plates connected together.

A Final common voltage will be 5 V B Final common voltage will be 2. D Heat produced in the circuit will be A Charge of amount Q willflowfromthe negative terminal to the positive terminal ofthe cell inside it B The total charge on the plate X will be 2Q.

C The total charge on the plate Y will be zero. D The cell will supply CE amount of energy. Which of the following quantities will remain the same? A the electricfieldin the capacitor B the charge on the capacitor C the potential difference between the plates D the stored energy in the capacitor. Which of the following quantities will change? A charge on the capacitor B potential difference across the capacitor C energy of the capacitor D energy density between the plates.

The capacitor is now connected to a battery. Now, A the facing surfaces of the capacitor have equal and opposite charges. B the two plates of the capacitor have equal and opposite charges. C the battery supplies equal and opposite charges to the two plates. D the outer surfaces ofthe plates have equal charges. X - connect the capacitor to a battery of emf E. Y - disconnect the battery Z - reconnect the battery with polarity reversed. W - insert a dielectric slab in the capacitor A In XYZ perform X, then Y, then Z the stored electric energy remains unchanged and no thermal energy is developed.

Ifthe plates of the condenser are then moved farther apart by the use of insulated handle, which one of the following is true? The plates are then drawn apart farther. Again it is connected to the same source. A the potential difference across the plate increases, while the plates are being drawn apart. B the charge from the capacitorflowsinto the source, when the capacitor is reconnected. C more charge is drawn to the capacitor from the source, during the reconnection.

D the electric intensity between the plates remains constant during the drawing apart of plates. B all the energy drawnfromthe source is stored in the capacitor. C the potential difference across the capacitor grows very rapidly initially and this rate decreases to zero eventually. D the capacity of the capacitor increases with the increase of the charge in the capacitor.

A net charge on connected plates is less than the sum of initial individual charges. B net charge on connected plates equals the sum of initial charges. C the net potential difference across them is differentfromthe sum ofthe individual initial potential differences. D the net energy stored in the two capacitors is less than the sum ofthe initial individual energies.

A slab of dielectric constant K is then inserted between the plates ofthe capacitor so as tofillthe space between the plates. The quantities charge, voltage, electricfieldand energy associated with the capacitor are given by Q , V , E and U respectively. A dielectric slab is 0 Q 0 0. Which of the following are correct? The switches S t.

Now, if the plates of the capacitor are moved apart then: The black box may contain i 1 O-J -o A I! C O—i—vwv- 11 -o D 1. Initially, while the switch S is open, one ofthe capacitors is uncharged and the other carries charge Q. The energy stored in the charged capacitor is 0. Sometimes after the switch is closed, the capacitors Cj and C carry 0 2. Which of 2 2. Question No. Time Limit: Requires recollection of various concepts. Examine the statements carefully and answer the questions according to the instructions given below: A if both A and R are correct and R is the correct reason ofA.

B if both A and R are correct and R is not the correct reason of A. C if A is correct and R is wrong. D if A is wrong and R is correct. JE if both A and R are wrong. The gases which are isosteres diffuse at the same rate under similar conditions. Reason R. Diffusion and effusion do not follow the same law. The value of van der Waal constant b is higher for N than for NH. Reason R Molecular motion ceases at absolute zero. Helium shows only positive deviationfromideal behaviour. Reason R Helium is chemically inert noble gas. Which one ofthe following is correct?

A Force of attraction between the molecules exists at low pressure only. B Force of attraction between the molecules exists at high pressure only. C Force of attraction between the molecules affect gaseous property at high temperature. D Force of attraction between the molecules affect gaseous property at low pressure. The "E factor" is the amount in kg of by product per kg of products. Calculate "atom utilization" and "E factor". Identify X, the desired product.

What is molarity of solid CaC0. From this info calculate the following in terms ofn and a. CuS0 crystal by 36 gm. Deduce the molecular formula of the 4. Compute masses ofAs and CO formed if When this solution is dropped on surface, C H gets evaporated and acid forms aunimolecular layer on the surface.

Ifwe 6 6. What volume of solution in ml should be used? Area covered by one molecule of acid is 0. Ifthis 3. B if both A and R are correct and R is not the correct reason ofA. D ifA is wrong and R is correct. E if both A and R are wrong. Reason R a-particles are di-positive ions having appreciable mass.

Isotopes of an element can be identified with the help of a mass spectrograph. The Hg level stood 15 mm higher in the open end as compared to the end connected to gas chamber. If the atmospheric pressure is The gas pressure in k Pa is A Pick up the correct statement assuming ideal gas behaviour: Gas A will tend to lie at the bottom II.

The number of atoms of the gas 'X' present in STPwillbe A 6. Calculate expression ofB in terms ofgiven constant for a stable crystal lattice given that ions are at a distance of r. Calculate potential energy ofthe crystal in terms ofr and other given constants.

Plot 0 0. Can you give a possible reason for this. Find 7. H2 ii. The mass of one litre ofthis organic gas is exactly equal to that of one litre ofN.

Therefore the molecular formula of 2. Calculate planks constant in eVs. Calculate atomic weight of X. In the crystal clear water of the lake, things at the bottom of the lake are also clearly visible. As the bubble rises to the top, it gets saturated with the water vapours and has a volume of ml of the surface.

The pressure at the surface is mm Hg. Ifthe depth ofthe lake is The beam falls normally on an area 1.

## Bansal CLasses Physics Study Material for IIT JEE

Calculate the no. J E E Humour. A Physics teacher, a Maths teacher and a Chemistry teacher were walking on a sea shore. Fascinated by sea waves the physics teacher said, "I want to study the wave nature of sea waves" and went into the sea and never returned back.

The maths teacher said, "I want to measure the volume of sea water" and went into the Sea and never returned back. The chemistry teacher concluded "Both physics and maths teacher are soluble in sea water under condition of 1 atm and K.

What is the angle made by the net acceleration of the bob with the string at point Q. Find the force exerted by the vertical wall OM on wedge, when the ball is in position B. Then, find the magnitude of average 71R acceleration during a time interval.?

Find the kinetic energy ofthe spring. If the radius of vertical circle is 2m, then find the speed of revolving body. Find the ratio T, 0.

Find the total work done by the force F on the particle. What is the normal reaction at B just after the bead is released? If it is needed to deliver a volume 0. Find the angular velocity ofrotation. The smooth semicircular wireframeisfixedin vertical plane. Find the normal reaction between bead and wire just before it reaches the lowest point. The other end isfixedto a peg on vertical wall. String is given an additional extension of 2a in vertical downward direction by pulling the mass and releasedfromrest.

Find the maximum height reached by it during its subsequent motion above point of release. Neglect interaction with peg if any Q. Find the value of angular velocity co. How much time is needed after motion begins for the normal acceleration of the point to be 2. If the body is moving in a circular orbit of 5m,then find its energy. The plane of rotation is xy. Radius ofthe ring is 2m. Particle then continues to move with attained speed. Calculate a angular acceleration of the particle, b tangential velocity ofthe particle as a function of time.

At this instant of time, the horizontal component of its velocity is v. Friction between the bead and the string may be neglected. Which bead reaches point B earlier? For this casefindthe values of x,. Express all answers in terms a and b. One end of a taut cord is attached to point A ofthe plate and the other end is attached to a sphere of mass m.

In the process, the cord gets wrapped around the plate. The sphere is given an initial velocity v on the horizontal plane perpendicular to the cord which causes it to make a Q. Find the velocity ofthe sphere when it hits point A again after moving in a circuit on the horizontal plane. Alsofindthe time taken by the spheretocomplete the circuit.

The string passes through a smooth fixed ring R and the other end of the string is attached to the fixed point A, AR being horizontal. Find the speed ofthe bead as it passes O, and find the greatest depth below O ofthe bead in the subsequent motion. The particle is attached to one end of a spring whose other end is fixed to the top point O of the ring. Determine the force constant of the spring. The particle moves up the vertical section A JZL and ultimately loses contact with it.

How far from point B will the mass land. Find R such that after losing contact at A and flying through the air, the particle will reach at the point B. Also find the normal reaction between particle and path at A. The ring is held on a level with the peg and released: Show that it first comes to rest after falling a distance: Alight fiictionless, small pulley isfixedat aheight of 6 mfromthe floor. Alight inextensible string of length 16 m, connected with Apasses over the pulley and another identical block B is hungfromthe string.

Initial height of B is 5mfromthe floor as 6m shown in Fig. When the system is releasedfromrest, B starts to move vertically downwards and A slides on the floor towards right. The upper string is attached to the ceiling, a box that weighs N hangsfromthe lower spring. Two additional cords, each 85cm long, are also tied to the assembly; they are limp i. Also find the tension T in the cord in terms of 9. A light j erk sets the system in motion. What will be the velocity u of the body at this moment?

Friction should be neglected. TTwmvmr Q. Find the ratio of instantaneous acceleration of blocks? A small ring of mass m, which can slide on the track, is attached to the other end of the spring. Consider the instant when the ring is released and i draw the free body diagram of the ring. The coefficient offrictionbetween the table and m, is 0. The table is rotating with an angular velocity 2. The masses are placed along the diameter ofthe table on either side ofthe centre O such that m, is at a distance of 0.

The masses are observed to be at rest with respect to an observer on the turn table. At rest is is the resultant force acting on it at Q? Startingfromthe origin, the particle is taken along the positive x-axis to the point a,0 and then parallel to the y-axis to the pint a,a. At a certain instant of time, the stone is at its lowest position and has a speed u.

The object given a horizontal velocity u. At the instant of crossing AB, its velocity is horizontal. Find u. The rod is set in angular motion about A with constant angular acceleration a. Each of the tracks risks to the same height. The speed with which the block enters the track is the same in all cases. At the highest point ofthe track, the normal reaction is maximum in [JEE Scr ' ]. Ifthe line j oining the centre of the hemispherical surface to the insect makes an angle a with the vertical, the maximum possible value of a is given by [JEE Scr.

Another 3. Determine the minimum horizontal velocity which should be imparted to the lower ball so that it can make complete revolution. When the displacement ofthe bob is less that maximum, its acceleration vector a is correctly shown in [JEE Scr.

Here k and a are positive constants. The mass is released with the spring initially unstretched. Then the maximum extension in the spring is [JEE Scr. The smaller sphere A has a radius R and the space between the two spheres has a width d. The ball has a diameter veiy slightly less than d. All surfaces are frictionless. The ball is given a gentle push Sphere B. The angle made by the radius vector ofthe ball with Sphere A the upward vertical is denoted by 9 shown in the figure.

Calculate the linear momentum ofthe particle w.

Collision is a kind of interaction between two or more bodies which come in contact with each other for a very short time interval. Types of collision: Elastic and Inelastic Collisions may be either elastic or inelastic. Linear momentum is conserved in both cases. Coefficient of Restitution: It is defined as the ratio of the velocity of separation to the velocity of approach of the two colliding bodies. Discrete System: The position vector of the centre of mass is.

The components of the position vector of centre of mass are defined as Zmixi. Continuous system: Centre of Mass of Some Common Systems: The centre of mass lie closer to the heavier mass.

Motion of the centre of mass: The kinetic energy of a system ofparticles consisits of two parts. Note that the term K' may involve translational, rotational or vibrational energies relative to the centre of mass. Newon's Laws of a system of particles: The first and second laws of motion for a system of particles are modified as: First law: The centre of mass of an isolated system is at rest or moves with constant velocity.

Second law: The net external force acting on a system of total of mass M is related to the acceleration of centre of mass of the system. A particle ofmass m is placed on the top ofthe hemisphere.

Find the angular velocity ofthe particle relative to hemisphere at an angular displacement 0 when velocity of hemisphere has become v. When his feet are just about to leave the ground his centre of mass is h 2. The motion ofball occurs on smooth horizontal plane. Find the impulse ofthe tension in the string when it becomes taut. The combined mass of trolley A excluding bag and the man is kg.

Find the ratio of velocities of trolleys A and B, just after the bag lands on trolley B. At the bottom most point of its motion, an identical mass m gently stuck to it. Find the anglefromthe vertical to which it rises.

Find the maximum height attained by their centre of mass. Bis pulled with constant —' L-r-' — acceleration a in direction shown. They are connected by a light spring. Find the maximum 2. Initially the system is at rest on a level fiictionless surface. The vertical plank falls anticlockwise and fmaly comes to rest on the top ofthe horizontal plank. Find the displacement ofthe hinge till the two planks come in contact.

The x coordinate of m is plotted against time. Then plot the x t. Both are initially located at origin 2 2 t in sec. It is observed that the path of their centre of mass is a straight line bisecting the angle between the given straight lines.

Find the magnitude ofthe acceleration of the centre of mass of the two blocks. Find the centre of mass of remainder is at a distance, from the centre Q.

Find the ratio ofm,: Find the maximum height up to which the centre of mass of system of the two masses rises. Find the value of coefficient of restitution for which the two disks move in perpendicular direction after collision.

The segments shown are circular. Find the linear momentum gained between 4 and 8 second. Assume S. A man of mass M is standing on the platform which is at rest. If the man leaps vertically upwards with velocity u,findthe distance through which the platform will descend.

Show that when the man meets the platform again both are in their original positions. If his body comes to a complete stop 0. Determine the velocity of each ball after coll ision. L A billiard table is 15 cm by 20 cm.

Find the position ofthe point and the direction of projection. The striker is a smooth plastic disc of radius 3 cm and mass gm.

## Physics and Chemistry Study Material From Bansal Classes

The board is fiictionless. The impact parameter for the collision is'd' shown in the figure. The side of the board is L. Find the value of impact parameter' d' and the time which the Queen takes to enter hole D after collision with the striker.

The system is at rest on a smooth horizontal table with the string just taut and in a straight line. The particle M is given a velocity V along the table perpendicular to the string. Prove that when the two end particles are about to collide: After being released, the 2m mass falls a distance x before the limp string becomes taut. Thereafter both the mass on the left rise at the same speed.

What is the final speed? Assume that pulley is ideal. On one scale pan there is an inelastic particle A of mass 2m. The system is released from rest with the hanging parts of the string vertical. Find the tension in the string and the acceleration of either scale pan.

At the instant when motion begins, a particle of mass 3 m is allowed tr fallfromrest and after t seconds it strikes, and adheres to, A. Find the impulsive tension in the string and the velocity of either scale pan immediately after the impact. Knowing that the cord is taut when Q.

A small block of mass m rests over it at left end A as shown in figure. A sharp impulse is applied on the block, due to which it starts moving to the right with velocity B v, 6 ms.

At highest point ofits traj ectory, the block collides with a particle -1? Initially, trolley is stationary and it isfreeto move along horizontal rails withoutfriction.

As a result, thread starts to deflect towards right. Plate A rests directly on hard ground, while plate C rests on a foam-rubber mat. Determine a the coefficient of resitution between the ball and the plates, AV CV b b the height h, of the ball's first bounce. Find the impulse it receives.

Find also the coefficient ofrestitution between the sphere and the wall. They collide when their line of centre is parallel to i - j. Find the velocity ofthe wedge and the ball immediately after collision.

On smooth surface of plank, a mass m is kept as shown above. It its end A is raised vertically at a constant speed v , express in terms of the length y of 0. The masses are moving to the right with uniform velocity v each, the heavier mass leading the lighter one. The spring in between them is of natural length during the motion. Block B A B collides with a third block C of mass m, at rest. The collision being K 2m v m completely inelastic. Calculate the maximum compression ofthe spring.

AB is 20 m high and CD is 3 0 m highfromthe ground. The two objects move in the same vertical plane, collide in mid air and stick to each other a Calculate the distance d between the towers and b findthe position where the objects hit the ground? The separation between the near surfaces of any two adj acent blocks is L. The bucket is 2 2. The masses of large and small spheres are 4M and M respectively. This arrangement is placed on a horizontal table. There is no friction between any surfaces of contact.

The small sphere is now released. Find the coordinates of the centre of the large sphere when the smaller sphere reaches the other extreme position.

They collide at the origin and stick together. Calculate i the final velocity ofthe combined mass after collision ii the amount of heat liberated in the collision.

At the highest point of its trajectory, the stone hits an object of equal mass hung verticallyfrombranch of a tree by means of a string of length L. A completely inelastic collision occurs, in which the stone gets embedded in the object. Determine a the speed ofthe combined mass immediately after the collision with respect to an observer on the ground. Calculate the angle between the velocity vectors of the two particles after the collision.

The coefficient of friction between each of the blocks and the inclined plane is 0. The 2kg block is given a velocity of It collides with M, comes back and has a velocity of 1. The other block M after the collision moves 0. Calculate the coefficient of restitution between the blocks and the mass of the block M. Which procedure would lead to a larger change in the velocities of the trolleys?

Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed v, the electrical power output will be proportional to: They collide at time t. Their velocities become vj and v, at time 2t while still moving in air. The 0 0. The height AC is m. Thefirstcanon ball hits the stationary carriage after a time t and sticks to it. At t , the second cannon 0 0 0. Assume that the resistive force between the rails and the carriage MM is constant and ignore the vertical motion of the carriage throughout.

What will be the horizontal 1 velocity ofthe carriage just after the second impact? The velocity of the centre of mass is: Vfirst V. That is, for the same input energy, the fluorescent bulb gives offmore light than the incandescent bulb. Carefully touch a fluorescent bulb and in an incandescent one after each has been lit for a few minutes. Explain why the incandesent bulb is a less efficient light emitter.

Why are they not electrocuted, even when they perch on a part ofthe wire where the insulation has worn off? Then resistor R is added in parallel. Are a the 2. S Consider a circuit containing an ideal battery connected to a resistor.

Do "work done by the battery" and " the thermal energy developed" represent two names of the same physical quantity? The portion out of the water becomes brighter. Is work done by the battery equal to the thermal energy developed in the resistor? Does your answer change ifthe battery is ideal? How then does a bulb light up as soon as the switch is turned on, although the bulb may be quite farfromthe switch? Recall that heat is defined as the energy being transferred due to the temperature difference.

Is the statement under quotes technically correct? Ifthe resistance ofour body is so large, why does one experience a strong shockfroma live wire of V supply? The internal resistance of the storage battery is lfi.

When thecharging current is0. A 13 Volts B The internal resistances — I—. The terminals of the battery are short circuited and the current I measured. Which one of the graph below shows the relationship between I and n? EMF of each shell is E and internal resistance r. What is the potential difference across the terminals ofbattery 2?

Each battery has an emf of 1. The voltage difference across any ofthe battery is A 0. What is the e. The e. I1-I2 Q. If the 3V,IQ 15V. Due to the current, the temperature of the wire is raised by AT in time t. The temperature of the wire is raised by the same amount AT in the same time t. The value ofN is: When resistance R of rheostat is changed correct graph of potential difference across it is v A B D R.

The generator has a terminal voltage of volts when the charging current isl 0 amperes. The battery has an emf of volts and an internal resistance of 1 ohm.

In order to charge the battery at 10 amperes charging current, the resistance R should be set at A 0. Volt y? Which ofthe graphs given below represents current voltage characteristics when P and Q are in series. Ofclt 10 P. Volt 10 20 P. Total resistance R is independent of temperature for O small temperature change if Thermal expansion effect is negligible A a! The Potential difference between A and B is kept volt. C 40V D None Q. Then equivalent resistance between A and B as shown infigureis: A voltage V is applied between the points A and B.

This applied value ofvoltage is halved after each section. What is the value ofRj? The resistance of the cylinder is independent of the temperature. The reading 6R. Ifthefreeend ofthe longer wire is at an electric potential of 8. If the wire is cut into n equal parts and all the parts are connected in parallel across the same supply, the total power generated in the t wire is H H A "a B n H C nH D n n 2.

Some heat is developed in it. The heat developed is doubled if A both the length and the radius ofthe wire are halved. B both the length and the radius of the wire are doubled C the radius of the wire is doubled D the length ofthe wire is doubled Q. A proportional to their marked voltage Is B inversely proportional to their marked voltage C proportional to the square oftheir marked voltage D inversely proportional to the square oftheir marked voltage E the same for all ofthem Q.

Which one is likely to fuse? The total heat produced in the 2. A second heater B gives out W when connected to a v d. The power consumed will be A X isfirstjoined to Y and then to Z. C twice the energyfinallystored in the capacitor D 4 times the energyfinallystored in the capacitor t-ws— Q 40 Three 60 W light bulbs are mistakenly wired in series and connected to a V power supply Assume the light bulbs are rated for single connection to V With the mistaken connection, the power dissipated by each bulb is: To convert it into a 10 A ammeter, the galvanometer coil should have a A 0.

The metre gives full-scale deflection for current I when A and B are used as its terminals, i. The —V v— -WA— value ofI is 0. A resistance is connected in series with the galvanometer to make a voltmeter. Ifthe least count of the voltmeter is 0. The ammeter reading is 0. When R2 is shunted by a resistance of 10 Q, A balance shifts to 50 cm. The ammeter shows zero deflection when the jockey touches the wire at the point C.

Acell of emfE is balanced at a length fromthe positive end of the wire. A potentiometer P is joined in parallel to R.

The ammeter reading is I 0. P is now replaced by a voltmeter of finite 0. The ammeter reading now is I and the voltmeter reading is V. The length AC for no deflection in galvanometer is A 2 m B 1. Agraph was plotted ofthe potential difference V between the terminals of the cell against the current I, which was varied by adjusting the rheostat. The graph is shown on the right; x and y are the intercepts of the graph with the axes as shown.

What is the internal resistance ofthe cell? Assume an ideal voltmeter and an ideal ammeter. Ifthe densities of charge carriers in the two wires are in the ratio 1: The resistivity of a semiconductor decreases with increases oftemperature. In a conducting solid, the rate of collision betweenfreeelectrons and ions increases with increase of temperature. A ' Select the correct statementfromthe following: C Both Y and Z are true.

D Yis true and Z is the correct reason for Y. The resistance of: A steady current flows through it. The drift speed of electrons at points P and q is v and v. When the voltmeter ofvery large resistance is connected across X it reads 1V.

When the point A and B are shorted by a conducting wire, the voltmeter measures 10 V across the battery. The internal resistance of the battery is equal to A zero B 0. The length ofthe wire3.

If the charge on a carrier is q coulombs, the drift 2. C Currentflowsin the branch from F to C. A The currentflowingin the icft loop is independent ofthe right loop. B The currentflowingin the right loop is independent ofthe left loop. The internal resistance of the battery is r. A Potential difference across points A and B must be more than E. Anonymous 23 November at Engineer Government Jobs 19 December at Anonymous 22 December at Shalini 23 December at Anonymous 26 December at Anonymous 9 January at Railway Government Jobs 16 January at Rahul Vikas 1 February at Anonymous 20 March at Sanjeet Kumar 24 March at Anonymous 28 March at Anonymous 30 March at Unknown 9 April at Anonymous 17 April at Mohd Huzaifa 24 April at Sudhir Yadav 19 July at Anonymous 8 July at Gaurav 17 July at Akshay Muthal 17 August at Anonymous 22 August at CareerLive 29 August at Vishal 11 September at Rishabh Tripathi 23 September at Anonymous 13 October at Anonymous 13 November at Bunty Singh 29 November at Rakesh Kumar 8 December at Chirag Sharma 20 January at Chetan 6 February at Nucleuseducation education 12 February at Unknown 19 March at Ritik Mohapatra 18 April at Sarang 9 May at Sudhir Kumar Singh 10 May at Aditya Vardhan Agarwal 27 June at Sachin 12 July at Unknown 27 August at Unknown 2 September at Chetan 8 December at Unknown 9 December at Newer Post Older Post Home.