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Description
Flashcards by Deepti Vyas, updated more than 1 year ago
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Created by Deepti Vyas
over 1 year ago
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| Question | Answer |
| Which of the following represents voltage? a. work done/charge X current b. work done/charge | a. work done/charge X current |
| Unit of electric power may also be expressed as (a) volt ampere (b) kilowatt hour (c) watt second (d) Joule second | volt ampere |
| Electrical resistivity of a given metallic wire depends upon (a) its length (b) its thickness (c) its shape (d) nature of the material | nature of the material. |
| Question 4. A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure (i), (ii) and (iii). The current recorded in the ammeter will be (a) maximum in (i) (b) maximum in (ii) (c) maximum in (iii) (d) the same in all the cases | (d) the same in all the cases |
| The unit of e.m.f.(Electromotive Force) of a cell is (a) dyne (b) volt (c) ampere (d) joule | volt 1.The EMF or electromotive force is the energy supplied by a battery or a cell per coulomb (Q) of charge passing through it. The magnitude of emf is equal to V (potential difference) across the cell terminals when there is no current flowing through the circuit. 2.The amount of energy (any form) changed into energy (electrical) per coulomb of charge is termed as EMF whereas the potential difference is the amount of energy (electrical) that is changed into other forms of energy per coulomb of charge. Cell, solar cell, battery, generator, thermocouple, dynamo, etc are examples of sources of emf. |
| Kilowatt hour is the unit of (a) power (b) energy (c) impulse (d) force | energy |
| Materials which allow larger currents to flow through them are called (a) insulators (b) conductors (c) semiconductors (d) alloys | conductors |
| Conventionally, the direction of the current is taken as (a) the direction of flow of negative charge (b) the direction of flow of atoms (c) the direction of flow of molecules (d) the direction of flow of positive charge | the direction of flow of positive charge |
| The unit of specific resistance is (a) ohm (b) ohm (c) ohm-metre (d) ohm per metre | ohm-metre |
| The slope of voltage (V) versus current (I) is called (a) resistance (b) conductance (c) resistivity (d) conductivity | resistance |
| The variable resistance is called (a) resistor (b) rheostat (c) open switch (d) none of these | rheostat |
| The SI unit of resistance is (a) ohm m (b) ohm m1 (c) ohm (d) (ohm)-1 | ohm |
| An electric iron draws a current 4 A when connected to a 220 V mains. Its resistance must be (a) 1000 Ω (b) 55 Ω (c) 44 Ω (d) None of these | 55 Ω |
| The element used almost exclusively for filaments of incandescent lamps (a) copper (b) gold (c) silver (d) tungsten | tungsten |
| 1. …………… measures the potential differences between two points of the circuit | Voltmeter |
| 2. Ammeter is used to measure the magnitude of …………… through any wire of a circuit. | Electric Current |
| 3. Electric current flows in the circuit from …………… terminal of cell to the …………… terminal of cell. | Positive, Negative |
| 4. Copper and aluminium are used for electric transmission lines because both posses …………… resistivity. | Low |
| 5. The rate at which electric energy is consumed or dissipated is called …………… | Electric power |
| Presence of chemically inactive gases like argon and …………… prolong the life of the filament. | Nitrogen |
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