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Worksheets8Class Electrical Conductivity of Liquids Full test
Total questions: 40
Worksheet time: 40mins
Name
Class
Date
1.
Pure water is
a)
Electric conductor
b)
semiconductor
c)
Insulator
d)
Resistor
2.
The material which do not allow electric current to pass through it is known as
a)
Electric conductor
b)
semiconductor
c)
Insulator
d)
Resistor
3.
In Sulphuric acid, Lemon juice, Tamarind juice and Detergent solution is not an electrolyte
a)
Sulphuric acid
b)
Lemon juice
c)
Tamarind juice
d)
Detergent solution
4.
In Metals, Acids, Bases __________ is electric conductor
a)
Metals
b)
Acids
c)
Bases
d)
Metals, Acids, Bases
5.
With increase in temperature the electrical conduction of metallic conductor
a)
Decreases
b)
Increases
c)
Remains same
d)
Increases then decreases
6.
Current flows from ____________ terminal to ______________ terminal in an electric conductor
a)
Positive to positive
b)
Positive to Negative
c)
Negative to Negative
d)
Negative to Positve
7.
When small current is passing through the circuit, it is detected by
a)
LED
b)
bulb
c)
tube light
d)
Incadescent bulb
8.
In Lemon juice, Distiled water, Vegetable oil and Alcohol _______ allow current to pass through them
a)
Lemon juice
b)
Distiled water
c)
Vegetable oil
d)
Alcohol
9.
Tap water is a good conductor of electricity while distilled water is not because
a)
Tap water contain salts
b)
Distilled water do not contain salt
c)
Only a) is correct
d)
Both a &b is correct
10.
When electrodes are immersed in water and electricity passed, the gas formed on the positive terminal is
a)
Hydrogen
b)
Carbon di oxide
c)
Oxygen
d)
Nitrogen
11.
When electrodes are immersed in water and electricity passed, the gas formed on the negative terminal is
a)
Hydrogen
b)
Carbon di oxide
c)
Oxygen
d)
Nitrogen
12.
Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating?
a)
To increase acidity
b)
To increase conductivity
c)
So that the colour becomes more prominent
d)
To burn copper sulphate
13.
A coating of _________is deposited on iron to protect it from corrosion and formation of rust
a)
copper
b)
aluminium
c)
Zinc
d)
silver
14.
Chromium plating is done on many objects such as car parts, bath taps, kitchen gas stove etc. Why?
a)
It does not corrode but prevents scratches
b)
It looks beautiful
c)
It costs less
d)
Articles can be sold at higher price
15.
The process of depositing a layer of any desired metal on another material by means of electricity is
a)
Electric plating
b)
Electroplating
c)
Electric depositing
d)
None of the above
16.
Some liquids are good conductors of electricity and some are poor conductors. Which one is a poor conductor?
a)
Acidic solution
b)
Alkaline solution
c)
Common Salt solution
d)
Distilled water
17.
Tin cans, used for storing food, are made by electroplating tin onto iron. Why?
a)
Tin gives a shiny appearance
b)
To make the vessel cheap
c)
Tin is less reactive than iron.
d)
To make the vessel lighter
18.
The materials that allow electric current to pass through them are called
a)
Insulators
b)
Resistors
c)
Conductors
d)
No answer
19.
A Violet colur spot is seen on potato around the wire connceted to __________ terminal of battery
a)
Positive
b)
Negative
c)
Ground
d)
Violet is not seen
20.
Which colour spot is seen on potato around the wire connceted to positive terminal of battery
a)
Green
b)
Blue
c)
Red
d)
Greenish blue
21.
Among Electro typing,Electroplating,Electroprinting,Galvanizing __________ method is used in ornamentation and decortion
a)
Electro typing
b)
Electroplating
c)
Electroprinting
d)
Galvanizing
22.
Electroplating is possible through
a)
Electrolysis
b)
Chemical process
c)
Dissolving
d)
Filtration
23.
Distilled water is
a)
Electric conductor
b)
semiconductor
c)
Insulator
d)
Resistor
24.
In an electrolyte, these are responsible for the flow of electric current
a)
Movement of protons
b)
Movement of electrons
c)
Movement of neutrons
d)
Movement of ions
25.
Current flows from ____________ terminal to ______________ terminal in an electrolyte
a)
Positive to positive
b)
Positive to Negative
c)
Negative to Negative
d)
Negative to Positve
26.
Processed food items are preserved in _____________ coated iron cans
a)
Zinc
b)
Gold
c)
Tin
d)
Magnesium
27.
In LEDs, the longer lead (wire) is always connected to the _______ terminal
a)
negative
b)
neutral
c)
positive
d)
Any terminal
28.
The scientist who made first cell
a)
Alessandro Volta
b)
Luigi Galvani
c)
Pierre de Fermat
d)
Newton
29.
The longer lead of an LED is connected to ___________ terminal of the battery
a)
Positive
b)
Negative
c)
Ground
d)
None
30.
The ___________ lead of an LED is connected to positive terminal of the battery
a)
Long
b)
Short
c)
No lead is conneced
d)
Leads are connected to ground
31.
A greenish blue spot is seen on potato around the wire connceted to __________ terminal of battery
a)
Positive
b)
Negative
c)
Ground
d)
No colour is seen
32.
Volta took this acid as electrolyte in his first cell
a)
Hydrochloric acid
b)
Sulphuric acid
c)
Nitric acid
d)
Carbonic acid
33.
The short lead of an LED is connected to ___________ terminal of the battery
a)
Positive
b)
Negative
c)
Ground
d)
None
34.
The scientist who stated that all living things contained electricity
a)
Alessandro Volta
b)
Luigi Galvani
c)
Pierre de Fermat
d)
Newton
35.
The ___________ lead of an LED is connected to negative terminal of the battery
a)
Long
b)
Short
c)
No lead is conneced
d)
Leads are connected to ground
36.
Length of all leads of an LED are
a)
equal
b)
not eqlual
c)
only lead will be there
d)
All three are equal
37.
How many leads are there to an LED
a)
1
b)
2
c)
3
d)
4
38.
Volta took these plates in sulphuric acid in his first cell
a)
Iron and Magnesium
b)
Magnesium and Copper
c)
Copper and Zinc
d)
Zinc and Iron
39.
The scientist who prepared first cell by dipping Iron and Zinc plates in sulphuric acid is
a)
Alessandro Volta
b)
Luigi Galvani
c)
Pierrre de Fermat
d)
No scientist
40.
LED stands for
a)
Low Electrical Device
b)
Least Electronic Device
c)
Lusture Emitting Device
d)
Light Emiting Diode
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