CBSE NCERT 8th (VIII) Science Chapter-14-Chemical Effects Of Current
Solved Questions for formative and summative assessments [FA+SA]
Q. What is electricity?
Solved Questions for formative and summative assessments [FA+SA]
Answer:
Electricity is a phenomenon known for its effect like chemical effect, Heating
effect and magnetic effect.
Q. What is the cause of
electricity?
Answer:
The flow of charge is the main cause of electricity.
Q. What is charge?
Answer:
The fundamental properties of matter caused by gain or loss of electrons.SI
unit of charge is Coulomb or C
Q. What is the charge on
1 electron?
Answer:
1.6 x 10-19C
Q. How many electrons present in 1 coulomb
charge?
Answer:
Q = n e Þ n = (1C)/(1.6x10-19C) = 6x1018
electrons
Q. What are the two
types of electricity on the basis of charge?
Answer:
the two types of electricity on the basis of charge are:
(a)
Static electricity: The electricity cause by the charge at rest.
(b)
Current electricity: The electricity cause by the charge when in motion
Q. What is the cause of
the flow of charge?
Answer:
Electric potential or potential difference is the main cause of electric
charge.
Q. What do you mean by
chemical effect of current?
Answer:
The phenomenon of causing chemical change by passing electric current through a
conduction solution is called chemical effect of current. For example:
Electrolysis and Electroplating
Q. What do you mean by
heating effect of current?
Answer:
Whenever current flows through a conductor it causes heating of material. This
effect of current is known as heating effect of current.
Q. What do you mean by
magnetic effect of current?
Answer:
Whenever current flows through a conductor it behaves like a magnet. This
effect of current is known as magnetic effect of current.
Q. What is LED?
Answer:
LED stands for Light Emitting Diode. LED glows even when a weak electric
current flows through it.
Q. What precaution you
should take to add LED in a circuit?
Answer:
The longer lead is always connected to the positive terminal of the battery and
the shorter lead is connected to the negative terminal of the battery.
CBSE Class VIII Science
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