Physics question and answers for December 29, 2023
- Q Two metal wires of identical dimension are connected in series If o and o are the conductivities of the metal wires respectively the effective conductivity of the combination is 2...
- Q A wire when connected to 220 V mains supply has power dissipation P Now the wire is cut into two equal pieces which are connected in parallel to the same...
- Q When 5 V potential difference is applied across a wire of length 0 1 m the drift speed of electrons is 2 5 x 104 ms If the electron density...
- Q Q 102 In the circuit shown in the figure the power dissipated in the circuit is Po if an ideal cell is connected across A and B Same power is...
- Q In the given circuit calculate the value of current in the 4 5 2 resistor and indicate its direction Also calculate the potential difference across each cell E 4V 0...
- Q same 5 The ratio of lengths of two wires made up of material is 2 3 and the ratio of areas of cross section 3 2 The ratio of their...
- Q the principle of working of a potentiometer ii In the following potentiometer circuit AB is a uniform wire of length 1 m and resistance 10 22 Calculate the potential gradient...
- Q When a battery sends current through a resistance R for time t the heat produced in the resistor is Q When the same battery sends current through another resistance R...
- Q Ans 1 13 A resistance wire connected in the left gap of metre bridge balances a 102 resistance in the righ gap at a point which divides the bridge wire...
- Q An electrical circuit is given in the figure Power developed in the 1 ohm resistance will be maximum if value of Xis 20 V 100 40 10 Zero www 492...
- Q Ten cell each of emf E and same internal resistance r are connected in series If due to oversight one cell is connected wrongly then the equivalent e m f...
- Q 5 Five equal resistances each of value R ar connected in a form shown alongside Th equivalent resistance of the network A R R B www D R R R...
- Q Using Kirchhoff s rules determine the value of unknown resistance R in the circuit so that no current flows through 402 resistance Also find the potential difference between A and...
- Q A potentiometer consists of a wire of length 8 m and resistance 20 Q It is connected to a cell of e m f 4 V Th potential difference per...
- Q 1 PHYSICS The color code of a resistance is given below Yellow Violet Brown Gold The values of resistance and tolerance respectively are 1 470 2 5 3 47 kn...
- Q A wire of resistance 10 2 is bent to form a circle F and Q are points on the circumference of the circle dividing it into a quadrant and are...
- Q Assertion A In a meter bridge experiment null point for an unknown resistance is measured Now the unknown resistance is put inside an enclosure maintained at a higher temperature The...
- Q Three resistance P Q Reach of 3 Q and an unknown resistance S form the four arms of a wheatstone bridge circuit When a resistance of 6 Q is connected...
- Q 0 A cell of unknown emfe and internal resistance r two unknown resistances R and R R R and a perfect ammeter are given The current in the circuit is...
- Q uestion No 02 alculate the power dissipated by the 5 volt zener diode for the following values of motor current assume the battery voltage remains constant at olts 3M For...
- Q Calculate the power dissipated by the 5 volt zener diode for the following values of motor current assume the battery voltage remains constant at wolts 3M a For motor current...
- Q The drift velocity of free electron in a conductor is vo when the current i is following in it If both radius and current are halved the drift velocity will...
- Q potential inside is onstant The charges Q Q Q Q are placed at the vertices of a square of side a n clockwise order The potential at the centre of...
- Q A Wheatstone bridge has arms of resistances 10 20 30 and 40 A galvanometer of resistance 502 is connected to the junctions of 102 and 40 coils and 20 and...
- Q Two circular rings of identical radii and esistance 36 2 are placed as shown in he figure Conducting joints are made t points A and B and a cell of...
- Q If an ideal voltmeter V connected across 4 2 in the circuit shown below shows null deflection then 2Q 4Q 15 V ww R value of R is 192 value...
- Q Two cells of emf E and are joined in series and the balancing length of potentiometer wire 550 cm If the terminal of is reversed the balance length obtained is...
- Q A The e m f of the driver cell in the potentiometer experiment should be greater than the e m f of the cell to be determined Reason R The...
- Q 1 Point Omotion of conduction electrons due to random collisions OOO motion of conduction electrons due to electric field E repulsion to the conduction electrons due to inner electrons of...
- Q When two identical batteries of internal resistance 12 each are connected in series across a resistor R the rate of heat produced in R is J When the same batteries...
- Q Question A steady current flows in a metallic conductor of non uniform cross section The quantity quantities constant along the length of the conductor is are L 1 Point current...
- Q A galvanometer having a coil resistance 100 2 gives a full scale deflection when a current of 1 mA is passed through it What is the value of the resistance...
- Q 27 The arrangement here shows a metallic sphere of radius r carrying charge Q The switch S is initially open The switch is closed at t 0 Charge on the...
- Q a Derive an expression for the resistivity of a material in terms of relaxation time number density and mass and charge of charge carriers in it Explain using this relation...
- Q a Are the paths of electrons straight lines between successive collisions with positive ions of the metal in the i absence of electric field ii presence of electric field b...
- Q A long straight wire carrying current of 25 A rests on a table as shown in figure Another wire PQ of length 1 m mass 2 5 g carries the...
- Q a State Kirchhoff s laws used in electrical networks b In the electric network shown in the figure use Kirchhoff s rules to calculate the power consumed by the resistance...
- Q b 4 V 422 www www 292 1 f 692 www 5 V 322 ww 392 13 d 7 V A two ring circuit is given below a Kirchhoff s...
- Q Amount of heat generated in the resistance R due to flow of charge q when current in the resistance linearly decreases down to zero in time interval from t 0...
- Q Four cells of identical emf and internal resistance are connected in series to a variable resistor The following graph shows the variation of terminal voltage of the combination with current...
- Q A closed circuit consists of a source of constant emf of 10 V connected to a resistor of resistance 10 0 and inductor of inductance O 1 H At time...
- Q The current through the 5 Q resistance in the network as shown in figure is L 00 5 3 A 40 20 V 2 10 V 1 292 wwww 1...
- Q Carbon silicon and germanium have four valence electrons each At room temperature which one of the following statements is most appropriate 1 The number of free conduction electrons is negligibly...
- Q 43 Sixteen resistances each of 5 2 are connected as shown in the figure wwwww www wwww wwww A www wwww www www www 24 V b wwww If a...
- Q A 5 wire potentiometer with each wire of 1 m is connected to a storage cell of emf 2 V and resistance 1 2 A primary cell is balanced against...
- Q Inside solid conductor electrons m randomly and keep colliding with fixed i If there N electrons and the velocity of the it clea i 1 2 3 N at a...
- Q 26 Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt...
- Q In a circuit shown in figure the heat produced in 5 Q resistor due to current flowing in it is 20 J The heat produced in 6 resistor is 12...
- Q The ammeter A reads 4 A and the voltmeter V reads 40 V The value of resistance R is Assuming finite value of resistance of ammeter and voltmeter A Exactly...
- Q In the network shown below potential difference across PC is 20 22 wwww 5 V 8 V 4 V 10 V HI P 40 Q www wwwww 40 Q
- Q The efficiency of Carnot engine is 50 and temperature of sink is 500 K If temperature of source is kept constant and its efficiency raised to 60 then the required...
- Q INTEGER ANSWER TYPE A conducting medium is in the form of a quarter of an annulus of radii a and b a with uniform thickness h as shown in figure...
- Q Jasthan Heat is flowing through a conductor of length I from x 0 to x 1 If its thermal resistance per unit length is uniform which of the following graphs...
- Q 28 The length of potentiometer wire is 1 m and its 28 Ha resistance is 4 22 A current of 5 mA is flowing in it An unknown source of...
- Q 6 Two bulbs whose resistances are in the ratio 2 3 are connected in series with a steady voltage source The ratio of powers expended in the bulbs will be...
- Q of the bridge if AC corres ponding to null defle ction of galvanometer is x what would be its value if the radius of the A wire AB is doubled...
- Q In a part of a network shown if at an instant current 10 A and it is decreasing at the rate of 5 As then find the value of potential...
- Q Maximum and minimum radii of given cylindrical conductor PQ are r and then current through the battery will be p resistivity 1 E Question Type Single Correct Type 2 Er...
- Q A reactance bridge arrangement replaces the resistor in a Wheatstone bridge with a capacitor or inductor Such a reactance bridge is then excited by an AC voltage Consider the following...
- Q 27 All the diodes are ideal The current flowing in resistor connected between the diodes D anc is 1 1A 2 20 192 D D D 292 www 7 9...
- Q 1 In the given circuit the switch is closed at t 0 The ratio of electric current through resistance R at t 0 and at t is 1 32 R...
- Q 16 To draw maximum current from a combination of cells how should the 2 points cells be grouped O a Series Ob Parallel O c Mixed O d depends upon...
- Q statement regarding the circuit 202 1 6V 892 4 F 2 F 40 Just after the switch S is closed I1 3A 12 0A and 13 0 Long time after...
- Q A coil of inductance L 27H and R 12 is connected to a source of constant emf E 3V A resistance Ro 22 is connected in parallel with the coil...
- Q Q No 12 An electric bulb is rated 220 V and 100 watt Resistance of bulb when operated on 110 volt will be 1 3 Correct Answer 2 1210 484...
- Q 93 A current is flowing through a cylindrical conductor of radius R such that current density at any cross section is given by J J where r is the radial...
- Q A branch of a circuit is shown in the figure If current is decreasing at the rate of 10 As the potential difference between A and B is AP EAMCET...
- Q A galvanometer of coil resistance I 2 is converted into voltmeter by using a resistance of 5 in series and same galvanometer is converted into ammeter by using a shunt...
- Q 12 Ammeter is always used O a in series with the element through which current is to be determined Ob in parallel with the element through which current is to...
- Q an applied electric field will polarise the polar dielectric material reason in polar dielectric each molecule has a permanent dipole moment but these ar e randomly oriented in the absence...
- Q After being closed for a long time the switch 5 in the circuit shown in the figure below is thrown open at t 0 In the circuit 24 0 V...
- Q A 6 The diagram shows an electric circuit 152 resistor T battery ammeter lamp A 1 g Another 150 resistor is connected in parallel with the 150 resistor that is...
- Q 6 The diagram shows an electric circuit 152 resistor battery lamp ammeter d i Name the instrument that would be needed to measure the potential difference p d across the...
- Q The length area of cross section and density of a metallic wire are respectively 1 m 10 6 m and 5x10 kg m Assuming that each atom contributes one free...
- Q ER In the figure internal resistance of the cell is negligible If resistance R is decreased A Current through R increases C The voltage drop across R decreases E None...
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