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**Home⇒ Engineering⇒ Resistance and ohms law**

1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |

2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |

Q21 ⇒ With rise in temperature the resistance
of pure metalsincreases[other wrong options] [Discuss in forum] decreases first increases and then decreases remains constant |

Q22 ⇒ A current of 16 amperes divides between
two branches in parallel of resistances
8 ohms and 12 ohms
respectively. The current in each
branch is6.4 A, 9.6 A[other wrong options] [Discuss in forum] 6.4 A, 6.9 A 4.6A, 6.9A 4.6A,9.6A |

Q23 ⇒ Two resistances R1 and R2 are connected
in series across the voltage
source where R2 > R1. The largest drop
will be acrossR2[other wrong options] [Discuss in forum] R1 either R1 or R2 none of them |

Q24 ⇒ Which resistor will be physically larger
in size?10ω, 50W[other wrong options] [Discuss in forum] 100ω, 10W 1Mω, 1/2W 1kω, 1W |

Q25 ⇒ With rise in temperature the resistance
of semi-conductorsdecreases[other wrong options] [Discuss in forum] increases first increases and then decreases remains constant |

Q26 ⇒ You have to replace 1500 ω resistor in
radio. You have no 1500 ω resistor but have several 1000 ω ones which you
would connecttwo in parallel and one in series[other wrong options] [Discuss in forum] two in parallel three in parallel three in series |

Q27 ⇒ A closed switch has a resistance ofzero[other wrong options] [Discuss in forum] about 50 ohms about 500 ohms infinity |

Q28 ⇒ A rheostat differs from potentiometer
in the respect that ithas higher wattage rating[other wrong options] [Discuss in forum] has lower wattage rating has large number of turns offers large number of tappings |

Q29 ⇒ The resistance of a copper wire 200 m
long is 21 ω. If its thickness (diameter)
is 0.44 mm, its specific resistance is
around1.6 x 10^{-8} ω-m[other wrong options] [Discuss in forum] 1.2 x 10 ^{-8} ω-m 1.4 x 10 ^{-8} ω-m 1.8 x 10 ^{-8} ω-m |

Q30 ⇒ Two resistors are said to be connected
in series whensame current passes in turn
through both[other wrong options] [Discuss in forum] both carry the same value of current total current equals the sum of branch currents sum of IR drops equals the applied e.m.f. |

Q31 ⇒ Heat in a conductor is produced on the
passage of electric current due toresistance[other wrong options] [Discuss in forum] reactance capacitance impedance |

Q32 ⇒ An open resistor, when checked with an
ohm-meter readsinfinite[other wrong options] [Discuss in forum] zero high but within tolerance low but not zero |

Q33 ⇒ Three resistances of 10 ohms, 15 ohms
and 30 ohms are connected in parallel.
The total resistance of the combination
is5 ohms[other wrong options] [Discuss in forum] 10 ohms 15 ohms 55 ohms |

Q34 ⇒ A resistance having rating 10 ohms, 10
W is likely to be awire wound resistor[other wrong options] [Discuss in forum] metallic resistor carbon resistor variable resistor |

Q35 ⇒ Which of the following quantities
remain the same in all parts of a series
circuit?Current[other wrong options] [Discuss in forum] Voltage Power Resistance |

Q36 ⇒ Voltage dependent resistors are usually
made fromnichrome[other wrong options] [Discuss in forum] charcoal silicon carbide graphite |

Q37 ⇒ The resistance of two wires is 25 ω
when connected in series and 6 ω when
joined in parallel. The resistance of
each wire is10 ω, 15 ω[other wrong options] [Discuss in forum] 20 ω, 30 ω 5 ω, 10 ω 10 ω, 20 ω |

Q38 ⇒ Varistors arenon-linear resistors[other wrong options] [Discuss in forum] insulators carbon resistors resistors with zero temperature coefficient |

Q39 ⇒ Resistance of a material always
decreases ifnumber of free electrons available
become more[other wrong options] [Discuss in forum] temperature of material is decreased temperature of material is increased none of the above is correct |

Q40 ⇒ The temperature coefficient of resistance of an insulator isnegative and dependent on temperature.[other wrong options] [Discuss in forum] positive and independent oftemperature. negative and independent of temperature. positive and dependent on temperature |

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