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Electricity

Electricity- 7th Std Science 2nd Term

Congratulations - you have completed Electricity- 7th Std Science 2nd Term. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%
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Question 1
An electric cell converts
A
Chemical energy into electrical energy
B
Mechanical energy into chemical energy
C
Electrical energy into light energy
D
Light energy into heat energy
Question 2
An electric current flowing through the conductor produces _________ around it.
A
Heat
B
Magnetic field
C
A mechanical force
D
All the above
Question 3
Secondary cells ______
A
cannot be recharged
B
cannot be reused
C
cannot be recharged and used
D
can be recharged and reused
Question 4
Find the odd one out......
A
Electric toaster
B
Electric fan
C
Electric iron
D
Room heater
Question 5
An electric fuse wire melts if the amount of current flowing through it is_______
A
more than minimum amount
B
less than minimum amount
C
more than maximum amount
D
less than maximum amount
Question 6
Indira Gandhi centre for Atomic Research is situated at
A
Neyveli
B
Ennore
C
Kalpakkam
D
Kudangulam
Question 7
In tamil nadu Hydroelectric Power Station is situated at
A
Mettur Dam
B
Santhanoor Dam
C
Vaigak Dam
D
Ennore
Question 8
Thermal Power Plant in Tamil Nadu is at
A
Kalpakkam
B
kudangulam
C
Ennore
D
Mettur
Question 9
The wind power generating capacity of Tamil Nadu is
A
2000MW
B
3000MW
C
4000MW
D
5000MW
Question 10
Solar cells convert
A
Mechanical energy into electrical energy
B
Light energy into electric energy
C
Heat energy into electric energy
D
Wind energy into electric energy
Question 11
To stop or allow the flow of current, the device used is
A
Switch
B
wire
C
Bulb
D
Battery
Question 12
The device used to detect the flow of current in electric circuits
A
Volt meter
B
Ammeter
C
Galvano meter
D
Han’s meter
Question 13
Electric ceel fish lives in
A
Asia
B
America
C
South America
D
Australia
Question 14
The filament inside the bulb is made of
A
Copper
B
Iron
C
Nicrome
D
Tungsten
Question 15
The electric current flows from the _______ terminal to the _______ terminal of the battery.
A
Positive/Negative
B
Negative / Positive
Question 16
The first electric cell was developed by
A
Lugi Galvani
B
Alessandro Volta
C
Ohm
D
Alexander Flemming
Question 17
Which one of the following is a good conductor of electricity.
A
Wood
B
Plastic
C
Human body
D
Rubber
Question 18
Which one of the following is a good insulator.
A
Iron
B
Silver
C
Earth
D
Wood
Question 19
The heating element in an electric appliance is a coil of wire made of
A
Copper
B
Aluminium
C
Nichrome
D
Tangsten
Question 20
The electric fuse works on the principle of
A
Heating effect of electric current
B
Magnetic effect of electric current
C
Light effect of electric current
D
Both light and magnetic effect of electric current
Question 21
Who found that there is a magnetic field around a wire carrying current?
A
Volta
B
Oersted
C
Ohm
D
Flemming
Question 22
The unit used to measure potential difference is
A
Volt
B
Ampere
C
Watts
D
Ohm
Question 23
An electric bell works on the principle of
A
Electromagnets
B
Heating effect of electricity
C
Mechanical energy
D
Atomic energy
Question 24
A device that prevents damage of electric appliances in a circuit is
A
Circuit Breaker
B
Electric Fuse
C
Switch
D
Battery
Question 25
  • Fill in the blanks
  A drawing of an electrical circuit with standard symbols is called a______
A
circuit diagram
B
Schematic
C
Symbols
Question 26
Electric toasters and electric irons get hot when switched on because of the _______ effect of current.
A
Freezing
B
Boiling
C
heating
Question 27
A fuse is a _____ device.
A
Security
B
safety
C
Productivity
Question 28
In an electric bulb the filament is made of ______
A
Plastic
B
Metal
C
Tungsten
Question 29
A pivoted magnetic needle will always point to the ________ direction.
A
North-South
B
East-West
Question 30
________ and ________ carry the electric current wherever it is needed.
A
cables and wire
B
Fibers and Plastic
Question 31
Coal is a ________ fuel
A
Liquid
B
fossil
C
Solid
Question 32
In Nuclear power stations, splitting of ________ produces energy, which is used to heat water
A
Polonium
B
Platinum
C
Uranium
Question 33
In hydro-electric power stations, _______ is used to turn the turbines.
A
fast flouring water
B
Liquid Oil
Question 34
Electric current is the flow of ______
A
Neutrons
B
electrons
C
Protons
Question 35
______ is improved the first electric cell developed by Luigi Galvani.
A
Alexander Fleming
B
Alessandro Volta
Question 36
Primary cells _______ recharged.
A
cannot be
B
Can be
Question 37
Secondary cells ________ recharged.
A
Cannot be
B
can be
Question 38
When the current flows the circuit is said to be _______ , when the current does not flow, the circuit is said to be ________
A
closed, open
B
Open, Closed
Question 39
When current passes through a wire it gets ______
A
Cool
B
hot
Question 40
________ is an instrument used to detect the flow of current in electrical circuits.
A
Tachometer
B
Speedometer
C
Galvanometer
Question 41
The amount of heat produced depends on the _______ and _______ of current flow.
A
Duration, Quantity
B
Period, unit
C
Maturity, volume
Question 42
Nichrome is an alloy of ________ and _____
A
Nickel and Chromium
B
Pottasium and magnesium
Question 43
________ can be reset manually or automatically to restore.
A
Circuit Protector
B
Circuit Braker
C
Serge Protector
Question 44
Many toys have ________ inside.
A
Electromagnets
B
Solenoids
C
Magnetism
Question 45
Match the following
  1. Electric cell a. Flow of charge
  2. Fuse wire b. Source of electric current
  3. Insulators c. Electromagnet
  4. Electric bell d. Prevents damage of electric appliances.
  5. Electric current e. Do not allow current to pass through them
A
1 5 4 3 2
B
5 1 4 2 3
C
4 3 2 5 1
D
2 5 1 3 4
Question 46
Match the following
  1. Electric Bell           a. Glass
  2. Oersted                b. Earth
  3. Insulator               c. Cell phone
  4. Conductor              d. Electromagnet
  5. Storage cell                   e. Magnetic effect of current
A
5 4 3 2 1
B
3 4 5 1 2
C
1 5 4 3 2
D
4 5 3 2 1
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There are 46 questions to complete.

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