Ohms Law Short Questions and Answers

41 Total power loss in the circuit is

A 10W

B 50.2 W

C 205 W

D 410 W

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Answer: 205 W

42 Specific resistance of a substance is measured in

A ohms

B mhos

C ohm-cm

D cm/ohm

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Answer: ohm-cm

43 A wire of resistance R has it length and cross-section both doubled. Its resistance will become

A 4 R

B 2 R

C R

D R / 4

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Answer: R

44 According to the fuse law, the current carrying capacity varies as

A diameter

B (diameter)3/2

C 1 / diameter

D All of these

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Answer: (diameter)3/2

45 Four identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

A 1 / 16 times

B 1 / 4 times

C 4 times

D All of these

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Answer: 1 / 16 times

46 The unit of electrical conductivity is

A mho / metre

B mho / sq. m

C ohm / metre

D None Of The Above

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Answer: mho / metre

47 Low resistance can be accurately measured by

A Kelvin bridge

B Wheat stone bridge

C Wein's bridge

D None Of The Above

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Answer: Kelvin bridge

48 Resistivity of a wire depends on

A length

B material

C cross section area

D none of the above

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Answer: material

49 The rating of fuse wire is expressed in terms of

A Ohms

B Mhos

C Amperes

D all of the above

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Answer: Amperes

50 Three equal resistors connected in series across a source of emf together dissipate 10 watts of power. What would be the power dissipated in the same resistors when they are connected in parallel across the same source of emf?

A 10 watts

B 30 watts

C 90 watts

D 270 watts

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Answer: 90 watts

51 A heating element of a hot plate on an electric cooking range draws 12 amperes from 240 V mains. How many kWh of energy will be consumed in one hour and 15 minutes

A 1.2

B 3.2

C 6.0

D 7.2.

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