Schließen
Which of the following represents voltage?
a. work done/charge X current
b. work done/charge
Unit of electric power may also be expressed as
(a) volt ampere
(b) kilowatt hour
(c) watt second
(d) Joule second
Electrical resistivity of a given metallic wire depends upon
(a) its length
(b) its thickness
(c) its shape
(d) 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
The unit of e.m.f.(Electromotive Force) of a cell is
(a) dyne
(b) volt
(c) ampere
(d) joule
Kilowatt hour is the unit of
(a) power
(b) energy
(c) impulse
(d) force
Materials which allow larger currents to flow through them are called
(a) insulators
(b) conductors
(c) semiconductors
(d) alloys
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 unit of specific resistance is
(a) ohm
(b) ohm
(c) ohm-metre
(d) ohm per metre
The slope of voltage (V) versus current (I) is called
(a) resistance
(b) conductance
(c) resistivity
(d) conductivity
The variable resistance is called
(a) resistor
(b) rheostat
(c) open switch
(d) none of these
The SI unit of resistance is
(a) ohm m
(b) ohm m1
(c) ohm
(d) (ohm)-1
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
The element used almost exclusively for filaments of incandescent lamps
(a) copper
(b) gold
(c) silver
(d) tungsten
1. …………… measures the potential differences between two points of the circuit
2. Ammeter is used to measure the magnitude of …………… through any wire of a circuit.
3. Electric current flows in the circuit from …………… terminal of cell to the …………… terminal of cell.
4. Copper and aluminium are used for electric transmission lines because both posses …………… resistivity.
5. The rate at which electric energy is consumed or dissipated is called ……………
Presence of chemically inactive gases like argon and …………… prolong the life of the filament.
