Physics question and answers for December 21, 2023
- Q 16 www 1923 192 SV sir yha pe Eeq tential difference B answer kaise hai yha pe internal resistance ke ross koi potential Top nhi hoga kya 202 2V Find...
- Q A B C In the circuit shown the device D has a property that if initially non conducting it remain conducting until voltage across it rises to a value V...
- Q In the circuit shown in figure A is a sliding contact which can move over a smooth rod PQ Resistance per unit length of the rod PQ is 1 ohm...
- Q D Net magnetic field at point O is zero 25 In the given circuit the point A is 9 V higher than point B Which of the following statements is...
- Q In the circuit shown in figure Current through R is zero if R 202 and R 42 In this case DIG A Current through R 2 5A C Both a...
- Q 5 Four cells each of emf 1 9 V and internal resis tance 1 are connected to an external resistance of 18 as shown in the figure Find the terminal...
- Q The intrinsic carrier density of a rectangular specimen of Ge is 2 5 10 m The length width and height of the specimen are 20 mm 3 mm and I...
- Q The figure shows a meter bridge wire AC having uniform are of cross section X is a standard resistance of 40 and Yis a resistance coil When Yis immersed in...
- Q A cell of EMF E and internal resistance r drives a current through an external resistance R Select the incorrect option The cell supplies a power El The heat is...
- Q A certain elastic balloon will support an internal pressure equal to P 100 kPa until the balloon becomes spherical at a diameter of D 1m beyond which P P C...
- Q In the circant shown in figure find a www brothersacademy co in a b b ww 1 00 1 12 0V 5 00 www d Brother s Academy LALPUR Campus...
- Q tery and the net power and supplied by the battery for external circuit 3 In the circuit shown in figure E 7V E 1V R 202 and R 302 respectively...
- Q A resistance of RQ draws current from a potentiometer Potentiometer has a total resistance Roas shown in figure 1 A 3 2V R Ro 4R R A voltage V is...
- Q The plot represents the flow of current through a wire at three different time intervals 0 2 3 5 6 8 The ratio of charges flowing through the wire at...
- Q At t 0 switch S is closed Current through switch as a function of time t is wwwwwww 222 4922 302 wwwwwww C 7F S HH 2 2 222 wwwwww...
- Q The reading of voltmeter in the circuit shown is 6 V 40 2 www 60 9 www V 40 9
- Q In the circuit shown the cell has an emf of 10 V and internal resistance of 1 ohm the other resistance are shown in the figure The potential difference is...
- Q 44 Time required for making a print at a distance of 40 cm from a 60 watt lamp is 12 8 second If the distance is decreased to 25 cm...
- Q 5 a Find the Thevenin equivalent circuit of the circuit shown in Fig to the left of the terminals Then find the current through RL 6 16 and 3692 492...
- Q A 200 MVA synchronous generator having inertia constant 5MJ MVA is connected in parallel with a 150 MVA generators having inertia constant of 4 MJ MVA both the generator are...
- Q 3 5 In the circuit shown in figure 3 376 E 5V r 19 R 40 R3302 and C 3uF Find the charge on the plates of capaictor A F...
- Q Assertion A Earthing provides a safety measure for electrical circuits and appliances Reason R When we bring a charged body in contact with the earth all the excess charge on...
- Q A cylindrical rod is reformed to half of its original length keeping volume constant If its resistance before this change were R then the resistance after reformation of rod will...
- Q An certain resistor dissipates 0 5 W when connected to a 3 V potential difference When con nected to a 1 V potential difference this resistor will dissipate A 0...
- Q To get maximum current through a resistance of 2 5 Q one can use m rows of cells each row having n cells The internal resistance of each cell is...
- Q 10 kJ s of heat is produced when a DC flows through a 100 Q resistor Which of the following ac produces nearly same heat per sec through the same...
- Q kii 12 wires each of resistance r are connected in the form of 12 sides of a cube Effective resistance across a Diagonally opposite corners 5r 6 b Face diagonal...
- Q A capacitor of capacity C is charged to a potential difference V and another capacitor of capacity 2 C is charged to a potential difference 2 V The charging batteries...
- Q You buy a 75 W light bulb The label means that A no matter how you us B the bulb was filled with 75 W at the factory C the...
- Q The cylinder is changed to one with the same mass and radius but a different moment of inertia Starting from rest the mass now moves a distance of 0 492...
- Q A point light source is located at a distance L from a screen A thir converging lens of focal length f L 4 and aperture radius R hel parallel to...
- Q 10 In the Bohr model of hydrogen atom the electron rotates in a circle of radius 0 53 about the nucleus Calculate the energy in eV needed to tear the...
- Q If the current sensitivity of a moving coil galvanometer is increased by 20 its resistance also increases and becomes 1 5 times then the voltage sensitivity of galvanometer will Increase...
- Q Coefficient of linear expansion of material of resistor is a Its temperature coefficient of resistivity and resistance area and a respectively then correct relation is 1 R aR a dp...
- Q D Two converging lenses of focal lengths f 20 cm and f2 10 cm are placed with their optical axes coinciding A rectangle of sides a 1 mm and b...
- Q Q 60 AB and CD are two resistance wires cut from a uniform long wire Lengths of AB and CD are L and 2L respectively and resistance of AB is...
- Q 6 A common emitter amplifier has a voltage gain of 50 an input impedance of 10002 and an output impedance of 2002 The power gain of the amplifier is a...
- Q 1 Consider a resistor with length L uniform cross sectional area A and uniform resistivity p that is carrying a current with uniform current density J Find the electric power...
- Q The resistance of each arm of a Wheat stone bridge is 100 A resistance of 10 2 is connected in series with the galvanometer then the equivalent resistance across the...
- Q 48 The equivalent resistance of series combination of four equal resistors is S If they are joined in parallel the total resistance is P The relation between Sand P is...
- Q 5 In a typical Wheatstone bridge the resistance in cyclic order are A 10 Q2 B 522 C 40 and D 42 For the bridge to be balanced A 10...
- Q Four identical electrical lamps are labelled 1 5V 0 5A which describes the condition necessary for them to operate at normal brightness A 12V battery of negligible internal resistance is...
- Q 12 A 5 80 m length of 2 0 mm diameter wire carries a 750 mA current when 22 0 mV is applied to its ends the drift speed is...
- Q Silver and copper voltameter are connected in parallel with a battery of e m f 12 V In 30 minutes 1 gm of silver and 1 8 gm of copper...
- Q Each potassium atom contributes one electron to the electron gas Calculate a the Fermi energy b the Fermi momentum c the Fermi temperature and d the contribution of free electrons...
- Q The system shown is in vertical plane Mass of L shaped rod is 2m and coefficient of friction between 2m and rod is 0 5 Then take ideal pulleys and...
- Q 134 The potential differences across the resistances are given in the following circuit as shown If point Q is grounded the potential at point S will be P Q R...
- Q switch S is shown in figure The switch S is in position 1 Find the potential difference V VB If now the switch S is put in position 2 at...
- Q fastened to a weight of 5 gram by threads float in equilibrium as shown in Fig 1 a 27 Calculate FIGURE 1 a 27 A 0 6m OB e 0101...
- Q A conductor with rectangular cross section ha dimension ax 2a x 4a as shown in figure Resistance across AB is x across CD is y and acros EF is z...
- Q Consider the two circuits below in which the left resistor is 100 and the right one is 30 2 Use your understanding of voltage resistance and current to answer these...
- Q WB JEE 1 The effective resistance between A and B in the figure 7 is if each side of the cube has 12 resistance 12 The effective resistance between the...
- Q 51 The relation between voltage sensitivity o and current sensitivity o of moving coil galvanometer is Resistance of galvanometer G a C 0 G G ov ov 0 b ov...
- Q 100 If two wires having resistances R and 2R 10 both joining in series and in parallel then ratio of heat generated in this situation applying the same voltage is...
- Q Q 52 A tungsten filament bulb is connected to a variable voltage supply The potential difference V is varied and the current I and steady temperature T of the filament...
- Q 10 The circuit shown in the diagram extends to the right into infinity Each A branch resistance is denoted by r What is the resistance between the terminals A and...
- Q 1 A nickel wire when connected across an ideal battery temperature of the wire increases by A0 100 C after a long time If the wire of half length is...
- Q 2 A non conducting cylindrical rod is inserted within two coils of insulated wires as shown in the given figure A battery is connected to coil 1 while a galvanometer...
- Q O terminal voltage When I current is drawn from cell then terminal voltage V is less than it s e m f i e V E Ir When cell is...
- Q 3 The circuit consists of a current source I 10 A paralleled by G 0 1 S and a voltage source E 200 V with 100 series resistance Find Norton...
- Q In the circuit shown the battery is ideal with emf V The capacitor is initially uncharged The switch S is closed at t 0 The current in DE at time...
- Q When the key K is pressed at time t 0 then which of the following statement about the current I in the resistor AB of the given circuit is true...
- Q In a building there are 15 bulbs of 45 W 15 bulbs of 100 W 15 small fans of 10 W and 2 heaters of 1 kW The voltage of...
- Q A single phase transformer 100 kVA 1000 V 100 V 50 Hz has a voltage drop of 5 across its series impedance at full load Of this 3 is due...
- Q 4 Two batteries with e m f 12 V and 13 V are connected in parallel across a load resistor of 10 22 The internal resistances of the two batteries...
- Q 0 An aluminium wire of diameter 0 24 cm is connected in series to a copper wire of diameter 0 61 cm The wires carry an electric current of O...
- Q 48 A galvanometer of resistance 202 and having full scale deflection for a current of 100 mA can be converted into a volt meter of range 5 Volt by connecting...
- Q A conducting rod of square cross section is bent in a semi circular shape of radius r as shown in figure Length of side of cross section is equal to...
- Q A galvanometer has an internal resistance of 50 92 and current required for full scale deflection is 1 mA GR R R ww ww 1 m 1 V 41 Find...
- Q Consider the circuit shown with key opened The key is closed at t 0 Capacitance of one of the shown capacitors is x uF For what value of x the...
- Q c 6 37V d IIV 41 In an a c circuit the potential difference across an inductance and resistance joined in series are respectively 16V and 20V The total potential...
- Q d 8mF 57 In the figure shown three AC voltmeters are connected at resonance a V 0 c V 0 A nuro V R V V ooooo L b V...
- Q SolveLancer Test In the above figure a current of 2A flows through A towards right Considering this circuit to be part of bigger circuit and A A as ideal ameter...
- Q Q16 Physics If V 12 V and VB 8 V then 652 A C E A B C D 352 252 192 V 56 V VB 68 V Vc 52...
- Q 36 Arrange the following materials in the increasing order of their resistivity Copper Platinum Silver Aluminum 1 Copper Silver Platinum Aluminum 2 Silver Copper Aluminum Platinum 3 Aluminum Platinum Silver...
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