Electricity measuring equipments Questions and Answers

an ini speed v ap Three charges 0 1 coulomb each are placed on the corners of an equilateral triangle of side 1 m If the energy is supplied to this system at the rate of 1 kW how much time would be required to move one of the charges onto the midpoint of the line joining the other two

The symbolic representation of four logic gates are given below 2009 1 ii iii TII Do a iv i iii c i ii iv O iv The logic symbols for OR NOT and NAND gates are respectively b iv ii i d iii iv ii

Let the end error on the LHS and RHS be equal to 1 cm For the balance point at O find out the error in the value of X If the end error is 1 cm from both sides then it means the correct reading will become 10 cm 1 cm from LHS and 90 cm 1 cm from the RHS E B A X B wwww 0 4 2 C 900 www 8 1 Correct Answer D F

3 16 Pote In a potentiometer of 10 wires the balance point is obtained on the 7th wire To shift the balance point to 9th wire we should C 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 whose emf is to be determined

Q 7 Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively and resistance 8 each They are connected in parallel with a cell of emf 4 V and negligible internal resistance The deflections produced in the tangent galvanometers A and B are 30 and 60 respectively If A has 2 turns then B must have B 18 turns 12 turns Correct Answer 6 turns

200 3 A neutral particle of mass 28 g is at rest in a uniform magnetic field B T At t 0 particle decays into two particle of equal mass and one of them having charge 3 C Both of them move in separate paths lying in the plane perpendicular to magnetic field B At later time t the particle collides neglecting the t interaction force Calculate 100

Chandrayan 1 the lunar mission launched by India in 2008 had all gold wiring A particular instrument on board the mission was operating at the same temperature as the space surrounding the Chandrayan at 3 K Instrument specifications demanded that no wire in the instrument should offer a resistance more than 7 m2 All the instruments on Chandrayan were fabricated in ISRO lab at room temperature of 30 C If the radius of all wires in the instrument was 0 1 mm as measured in ISRO lab If the maximum allowable length as measured in ISRO 22 lab of any wire is approximately meter then find 1 Take 1 Assume that resistivity and length of gold wire change linearly with temperature You can use these properties of gold Resistivity at room temperature p 2 2 x 10 m Temperature coefficient of resistivity 0 0032 K Linear thermal expansion coefficient g 1 5 x 10 K

A ample 2 10 Two resistors of resistances R 100 3 ohm and R 200 4 ohm are connected a in series b in parallel Find the equivalent resistance of the a series combination b parallel combination Use for a the relation R R R and for b 11 1 R R R and AR AR AR R2 R R2

are usually made of 1 Metals with low temperature coefficient of resistivity 2 Semi conducting materials having low temperature coefficient of resistivity Metal oxides with high temperature coeffi cient of resistivity 4 Metals with high temperature coefficient c resistivity

In a potentiometer experiment the balancing length for a cell of emf 2 V and internal resistance 1 Q is 3 m Then the balancing length for a cell of emf 4 V and internal resistance 2 without changing the current in potentiometer wire is 3 m 6 m 2m 1 m

A voltmeter has a resistance of G ohm and a range of V volt The value of resistance that must be used in series to convert it into a voltmeter of range nV volt is 1 n 1 G 2 nG 3 3 G n 1 G

If nn and ne be the number of holes and conduction electrons in an extrinsic semiconductor then Question Type Single Correct Type 1 nh ne 2 nh ne 3 ne nh

A galvanometer has an internal resistance of 50 2 and current required for full scale deflection is 1 mA then the series resistance required to use it as a voltmeter with range as indicated in figure is 50 R Gwww 1 950 2 9 k 2 ko 1 V R www 10 V 2 950 2 10 ks 4 None of these

If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a Low resistance in parallel High resistance in parallel O High resistance in series Low resistance in series Marks 4

You are given a nichrome wire rheosta t 6V battery and ammeter a Draw a circuit diagram by connecting these in series b If ammeter reading is 2A then what will be the intensity of current c In order to change a 6V battery a 12 V battery is connected to the circuit what will be the ammeter reading

The surge absorb installed before the lightning arreste on the line side in order to Answer minimize the post discharge L voltage of lightning arrester reduce the cost of surge B absorber C improve the efficiency of lightning arrester nflect the traveling waves