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EXPERT MDCAT
Expert Emergency Series 2020
F.Sc. (Part-II)
Test: Current Electricity Time Allowed: 40 Mins
Total Marks: 30 Marks
PHYSICS
SECTION-I
Short Questions
Note: Attempt all questions. All questions carry equal marks. 02x10 = 20 marks
Q.No.1: Do bends in a wire affect its electric resistance?
Q.No.2: Why does the resistance of conductor rises with temperature?
Q.No.3: What are the difficulties in testing whether the filament of a lighted bulb obeys Ohm’s
Law?
Q.No.4: Describe a circuit which will give a continuously varying potential.
Q.No.5: Describe heating effect of current.
Q.No.6: Differentiate between E.M.F. and Potential Difference.
Q.No.7: Justify the formula P=V2/R.
Q.No.8: State Kirchhoff’s Rules.
Q.No.9: What is Wheatstone Bridge? Why is it used?
Q.No.10: State Ohm’s Law. Give short review of series and parallel combination of circuits.
SECTION-II
Long Questions
Note: Attempt all questions. All questions carry equal marks. 02x05 = 10 marks
Q.No.1: Write a note on potentiometer.
Q.No.2: The resistance of an iron wire at 0C is 1x104 Ohm. What is the resistance at 500C, if
the temperature co-efficient of iron is 5.2x10-3 K-1.