Physics question and answers for December 31, 2023
- Q If two conductors say A and B of same material are placed in contact with eac h other and not in contact with the eart h Then say if one...
- Q A battery of EMF 120 0 V is connected to a 38 0 ohm resistor As a result current of 2 0 A exists in the resistor The rate at...
- Q Consider the following circuit where the capacitor is initially empty zero initial conditions the capacitance C is C 1mF and the voltage across the capacitor is vc t 5e 10t...
- Q 18 12 The velocity of charge carriers of current about 1 ampere in a metal under normal conditions is of the order of a a fraction of mm sec b...
- Q the circuit shown the current through the 42 resistor is 1 A when the points P and M are connected to a d c voltage source The potential difference between...
- Q 73 When the key K is pressed at time t 0 then which of the following statement about the current in the resistor AB of resistance 1000 of the given...
- Q value of the single equivalent resistor that could be used to replace the entire resistor network Assume the following values for the circuit elements 12 0 V Ra 18 00...
- Q C 2 28 In following diagram boxes may contain resistor or battery or any other element 1A I 10 V 10 A 1A i Electric power output across box 10...
- Q A heater coil connected across a given potential difference has power P Now the coil is cut into halves and joined in parallel Across the same potential difference this combination...
- Q 6 In the electric network shown when no current flows through the 402 resistor in the arm EB the potential difference between the points A and D will be 292...
- Q 22 In the situation shown the potential difference across the cell of smaller e m f is 12 V 1 2V 12 www 10 V ww 112 www 292 2...
- Q 1 Charge Q passing through a cross section of conductor at an instant is given by Q 0 5 t C where t is in second Current through the conductor...
- Q 54 Two cells having the same emf are connected in series through an external resistance R Cells have internal resistances r and r r r respectively When the circuit is...
- Q A letter A is constructed of a uniform wire with resistance 1 02 per cm The sides of the letter are 20 cm and the cross piece in the middle...
- Q 03 A resistance wire connected in the left gap of a metre bridge balances a 10 resistance in the right gap at a point which divides the bridge wire in...
- Q The equivalent resistance of the resistors connected in the circuit as shown in following figure between the point A and Bis A R 3R 9R 2 R ww 3R www...
- Q Two bulbs of rated power 60 W and 100 W and same specified voltage 220 V are connected in series to a 440 V DC source 60 W bulb gives...
- Q 3 27 A piece of wire is cut into four equal parts and the pieces are bundled together side by side to from a thicker wire Compared with that of...
- Q In the circuit given below current flowing in 6 Q resistor is 2 A The emf E of the battery is 2 A 692 4922 ww 84 V 24 V...
- Q 7 In the circuits shown below the readings of th voltmeters and the ammeters will be i 10 Q2 wwwww V 10 V Circuit 1 4 a V V and...
- Q An ideal voltmeter Vand ideal ammeter A are connected in a circuit as shown in the figure If the reading of the voltmeter is 32 V the reading of ammeter...
- Q or has been 3 29 Variation of current and voltage in a cond shown in figure 3 304 The resistance of the conductor is A 40 392 I A A...
- Q The charge flowing through a resistor R 20 varies with time as q 3 4t The heat produced in 2 second is about where q is in C and tis...
- Q 3 7 Resistivity of Various Materials 5 The color code of a resistance is given below um Yellow Violet Brown Gold The values of resistance and tolerance respectively a a...
- Q An N P N transistor in a common emitter mode is used as a simple voltage amplifier with a collector current of 4mA The terminal of a 8V battery is...
- Q Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance The ratio of power consumption by the bulbs when...
- Q If a cell of constant E M F produces the same amount of the heat during the same time in two in dependent resistors R and R when they are...
- Q 3 51 A 10m long wire of resistance 2002 is connected in series with battery of EMF 3V and negligible internal resistance and a resistance of 10 2 The potential...
- Q plz explain its answer In the potentiometer arrangement shown the driving cell D has emf E and internal resistance r The cell C whose emf is to be measured has...
- Q 10 Find the effective resistance between points A and B www 192 192 www 1 92 1 3 1 c wwwwwwww 1 22 192 19 122 www 12 A D...
- Q Why the direction is from Q to P 100 In the circuit shown the current in the 10 resistor is directa 6V 392 a 1 3 A from P to...
- Q iv The diagram above shows a circuit with a 12 v d c power supply an ammeter and two 4 2 resistors connected in parallel Calculate the total resistance of...
- Q A galvanometer has a resistance of 25 n and given a full state deflection for a current of 10 mA This galvanometer is to be modified to give range of...
- Q If the ratio of the concentration of electrons that of holes in a semiconductor is 7 5 and the ratio o currents is 7 4 then what is the ratio...
- Q Figure shows a common emitter amplifier with B 100 What is the maximum peak to peak input signal v for which is distortion free output may be obtained Assume VBE...
- Q ix A solenoid of inductance L with resistance r is connected in parallel to a resistance R A battery of EMF E and of negligible internal resistance is connected across...
- Q Let resistance of PN junction be R then I Illustration 9 What is the value of current I in given circuits Solution I 20 10 10 R 30 10 1...
- Q 18 In the circuit shown in figure 32 W13a E F G and H cells of emf 2 1 3 and 1V respectively The resistances 2 1 3 and 1...
- Q A laptop and a hair trimmer of rating 40 W 220V and 10W 220V respectively ar e connected in series and across a sou rce of 440 volt The fuse...
- Q acitance variable Current power alue of power viii A box contains L C and R When 250V DC voltage is applied to the terminals of the box a current of...
- Q In the circuit shown the reading of the Ammeter is doubled after the switch is closed Each resistor has a resistance 1 Q and the ideal cell has an e...
- Q iv The equivalent inductance of two inductors is 2 4H when connected in parallel and 10H when connected in series What is the value of inductance of the individual inductors...
- Q Consider a Wheatstone bridge with resistance and capacitance connected as shown Find the condition on the resistance and the capacitance such that the bridge remains balanced at all times A...
- Q In an p n junction diode change in temperature due to heating 1 Does not affect resistance of p n junction 2 Effects only forward resistance 3 Effects only reverse...
- Q A circuit is composed of ten identical batteries and a resistor R 10 2 Each batteries has an emf of 2 V and internal resistance 0 1 22 The voltage...
- Q Potential at a point is 500 volt How much work we will have to perform to shift electron from to this point B D 500J 500 500eV 500eV
- Q a A resistor has colour band sequence Orange Violet orange gold and another resistor Orange Violet orange silver Find the range in which its value must lie so as to...
- Q Three identical bulbs are connected in series as shown When switch is closed A B 3 C Question Type Single Correct Type Q 1 Both bulbs A and B become...
- Q 92 Current Electricity nichrome is 1 7 x 104C 1 The temperature of nichrome now is NCERT Pg 105 1 700 C 3 850 C 10 The incorrect statement among...
- Q 45 A galvanometer of resistance 100 2 gives full scale deflection at 10 mA current What should be the value of shunt so that it can measure a current of...
- Q 8 In a potentiometer of 8 wires the balance point is obtained on fifth wire To shift balance point to 6th wire we should NCERT Pg 122 1 Decrease resistance...
- Q 47 A 10 m long potentiometer wire is connected to a battery having a steady voltage A Leclanche cell is balanced at 4 m length of the wire If the...
- Q 33 Two identical bulbs are connected in parallel across an ideal source of emf E The ammeter A and voltmeter Vare ideal If bulb B gets fused then Sir A...
- Q 11 In the circuit shown in figure if ammeter and voltmeter are ideal then the power consumed in 902 resistor will be A 2002 1 3 33 W 3 144...
- Q mm s 1 Average collision time for electrons conductor under a certain pote difference is found to be 10 15 s The mob of electron in metal conductor is NCERT...
- Q charged particle is having drift veld 5 x 104 m s1 in an electric fi 10 V m 1 The electron mobility NCERT P 2 5 x 104 m V...
- Q Thousand cells of same emf E and same internal resistance r are connected in series in same order without an external resistance The potential drop across 399 cells is found...
- Q A current of 10 A is maintained in a conductor of cross section 1 cm2 If the number density of free electrons be 9 1028 m 3 the drift velocity...
- Q 8 The resistance of a rectangular block of copper of dimensions 2 mm x 2 mm x 5 m between two square faces is 0 02 22 What is the...
- Q 9 Ends A and B are connected to positive and negative terminals of a cell of emf 12 V respectively The value of voltage shown by voltmeter of negligible resistance...
- Q 4 In the situation shown in figure an ideal ammeter is connected across 72 resistors Select the correct statement from the following 2 22 www A 72 www 10 V...
- Q 49 Two electric bulbs whose resistance are in the ratio of 1 2 are connected in parallel to a constant voltage source The power dissipated in them has the ratio...
- Q 4 A voltmeter is connected in parallel with a variable resistance R which is in series with an ammeter and a cell as shown in the figure For one value...
- Q 37 In figure the e m f of the cell is 2V and internal resistance is negligible The resistance of the voltmeter is 80 ohm The reading of the voltmeter...
- Q A curved rectangular bar forms a resistor the curved sides are concentric circular arcs If p is the resistivity of the material of bar I is the length of inner...
- Q the circuit shown in the figure the switch was kept in position 1 for a very long time and then at t 0 it is shifted to position 2 The...
- Q 1 3 flux flux time time 2 4 10 V 292 wwwww flux flux 302 time B time In the circuit shown in the figure the magnitude of potential difference...
- Q 9 The equivalent resistance between A and B in the given network is 19 292 www wwwww 19 19 wwww 19 wwwww 292 K wwww 19 B A 1 3Q...
- Q A bipolar junction transistor with one junction forward biased and either the collector or emitter open operates in the a cut off region b saturation region c pinch off region...
- Q i A magnetic flux through a stationary loop with a resistance R varies during the time interval t as at t 1 Find the amount of heat generated in the...
- Q 7 Ten cells of emf 1 5V and internal resistance 1 2 are connected across a R2 resistor i All In series ii All in parallel Find the expressions for...
- Q 9 Three cells of emf 5V and 10 V and 15 V have internal resistances 202 each The cells are connected in series with an external resistance R and the...
- Q 76 A simple potentiometer circuit is shown in figure The internal resistance of 4 V battery is negligible AC is the uniform wire of length 100 cm and resistance 2...
- Q 49 Four identical cells each having emf E and internal resistance r are connected in series to form a loop ABCD as shown in figure Find potential difference across AB...
- Q A part of circuit is shown in figure The wire A is a very thick copper and wire B and C are identical wires of manganin The currents in wires...
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