comeplete answer to PHY192: Introductory Physics Practical Ii TMA2

Question 1 : Which of the following is not true about a rheostat?

answer
It is a constant current instrument

Question 2 : Two resistances of 2Ω2Ω each are connected in parallel and then connected in series to a 1Ω1Ω resistance. What is the equivalent resistance
answer
3ΩΩ

Question 3 : Which of the following is correct?
answer
Kirchoff’s loop rule represents conservation of charge

Question 4 : A slide-wire potentiometer is balanced against 1.0182V standard cell at slide contact of 40.2cm. For an unknown emf the slide contact is 11.9cm.What is the emf of the unknown cell?
answer
0.30V

Question 5 : In an experiment, potential difference is plotted on the ordinate (vertical axis) and current on the abscissa(horizontal axis). The slope of the graph represents
answer

resistance

Question 6 : The time rate of flow of charge across a unit cross-sectional area of a conductor defines
answer
electric current

Question 7 : The difference between the emf of a battery and the lost volts when discharging is called

answer

terminal voltage

Question 8 : The diagram shown is called a ________________

answer

wheatstone bridge

Question 9 : For a metallic conductor, Ohm’s law holds provded
answer
temperature remains constant

Question 10 : A device which may be used to compare the potential differences of electric cells is called ———–
answer
potentiometer

Question 11 : The advantage of potentiometer over voltmeter in measurements of emf is that
answer
it does not draw current from the circuit under test
Question 12 : The bending of a ray of light as it travels from one transparent medium to another is called ——–
answer

refraction

Question 13 : A device known as ———- may be used for comparison of resistances
answer
rheostat

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Question 14 : Which of these is not a useful precaution in an electrical experiment?
answer to physics practical ii tma1

answer
jockeys should be dragged on resistance wires

Question 15 : The term “lost volts” is used to describe ———- of a cell
total current
terminal potential difference
electromotive force
energy dissipated in the internal resistance

Question 16 : The name of the device which provides sliding contact with the potentiometer wire is called ———–
answer
galvanometer

Question 17 : In the construction of an ammeter, a low resistance called resistance———— is connected in parallel to a suitable galvanometer
answer
shunt

Question 18 : The slide wire of the figure shown is balanced when the the uniform slide wire AB is divided as shown. The value of the resistance X is _________________ΩΩ

answer

2

Question 19 : The unit of electrical energy expended per unit time is calledd ———
volt
watt
joule
am

Question 20 : A 1mΩΩ resistor is to be made from a 1-mm diameter wire of resistivity $2.8\time10{-8}.Find the length of the wire
4.2cm
2.8cm
1.4cm
3.6cm

answer to physics practical ii tma1

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