# Practice Test: Question Set - 06

1. The condition for the validity under Ohm's law is that
(A) Resistance must be uniform
(B) Current should be proportional to the size of the resistance
(C) Resistance must be wire wound type
(D) Temperature at positive end should be more than the temperature at negative end

2. 1 angstrom is equal to
(A) 108 mm
(B) 10-6 cm
(C) 10-10 m
(D) 10-14 m

3. Out of the following which is an insulating material?
(A) Copper
(B) Gold
(C) Silver
(D) Paper

4. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is
(A) 6.4 A, 6.9 A
(B) 6.4 A, 9.6 A
(C) 4.6 A, 6.9 A
(D) 4.6 A, 9.6 A

5. All of the following are equivalent to watt except
(A) (Amperes) ohm
(B) Joules/sec.
(C) Amperes × volts
(D) Amperes/volt

6. Which of the following statement is true?
(A) A galvanometer with low resistance in parallel is a voltmeter
(B) A galvanometer with high resistance in parallel is a voltmeter
(C) A galvanometer with low resistance in series is an ammeter
(D) A galvanometer with high resistance in series is an ammeter

7. An electric filament bulb can be worked from
(A) D.C. supply only
(B) A.C. supply only
(C) Battery supply only
(D) All above

8. In a lamp load when more than one lamp are switched on the total resistance of the load
(A) Increases
(B) Decreases
(C) Remains same
(D) None of the above

9. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes
(A) 1/9 times
(B) 3 times
(C) 9 times
(D) Unchanged

10. The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is
(A) 50 %
(B) 60 %
(C) 100 %
(D) 150 %

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