Subject: Physics (Electricity) Class: 8th Total Marks: 19
Name: _______________________
1)
An electric current in conductors is due to the flow
of
(a) positive ions (b) negative ions (c) positive charges (d)
free electrons
2) The ampere is a unit of:
(a) energy (b)
potential difference (c) electric potential (d)electric current
3) The rate of flow of charge
through any cross-sectional area is called:
(a) Potential difference (b) energy (c) charge (d) electric current
4) Battery
converts chemical energy into which energy:
(a) Mechanical (b)
Electrical (c) Thermal (d) None of these
5) The resistance of conductors is
due to:
(a) Protons (b)
Fixed atoms (c) Molecules (d) Neutrons
6) The
unit of potential difference is:
(a) volt (b)
coulomb (c) ampere (d) joule
7) SI unit of resistance is:
(a) Volt (b) Ampere (c) Ohm (d)
Joule
8) Which
instrument is used to detect current?
(a) Galvanometer (b) Voltmeter (c) Ammeter (d)
Electroscope
9) The current
used in houses is:
(a) Alternating current (b)
Conventional current (c) Direct current (d) None of these
10)
The current which changes its direction is called:
(a) Transient Current (b) Conventional current (c) A.C (d) D.C
11) The
current which does not change its direction is called:
(a) A.C (b)
Conventional (c) D.C (d) Transient current
12)The resistance of the voltmeter is:
(a) zero (b)
low (c) very high (d)
10 W
13)The
color of live wire is:
(a) Black or blue (b) Green or yellow (c) White or Grey (d) Red or Brown
14)Current is equal to:
(a) RV (b) QR (c) Q/t (d) t/Q
15)As the
temperature of a conductor rises, its resistance:
(a) Increases
(b) Decreases (c) Does not
change (d)
None of these
16)The property of a substance, which opposes the flow of current through it is called:
(a) Resistance (b) Reactance (c) Resistivity (d) None
17) Diamond
does not conduct electricity, because it has no:
(a) free electrons (b) free protons (c)
free neutrons (d)free positive charge
18) 100 ´ 10-3 A =
(a) 10-3A (b)
10-2 A (c)
10 A (d) 10-1 A
19)Battery is one of the sources
of:
(a) Heat (b)
Light (c) Current (d)
Sound
