Electricity- 7th Std Science 2nd Term
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An electric cell converts
Chemical energy into electrical energy
Mechanical energy into chemical energy
Electrical energy into light energy
Light energy into heat energy
An electric current flowing through the conductor produces _________ around it.
A mechanical force
All the above
Secondary cells ______
cannot be recharged
cannot be reused
cannot be recharged and used
can be recharged and reused
Find the odd one out......
An electric fuse wire melts if the amount of current flowing through it is_______
more than minimum amount
less than minimum amount
more than maximum amount
less than maximum amount
Indira Gandhi centre for Atomic Research is situated at
In tamil nadu Hydroelectric Power Station is situated at
Thermal Power Plant in Tamil Nadu is at
The wind power generating capacity of Tamil Nadu is
Solar cells convert
Mechanical energy into electrical energy
Light energy into electric energy
Heat energy into electric energy
Wind energy into electric energy
To stop or allow the flow of current, the device used is
The device used to detect the flow of current in electric circuits
Electric ceel fish lives in
The filament inside the bulb is made of
The electric current flows from the _______ terminal to the _______ terminal of the battery.
Negative / Positive
The first electric cell was developed by
Which one of the following is a good conductor of electricity.
Which one of the following is a good insulator.
The heating element in an electric appliance is a coil of wire made of
The electric fuse works on the principle of
Heating effect of electric current
Magnetic effect of electric current
Light effect of electric current
Both light and magnetic effect of electric current
Who found that there is a magnetic field around a wire carrying current?
The unit used to measure potential difference is
An electric bell works on the principle of
Heating effect of electricity
A device that prevents damage of electric appliances in a circuit is
- Fill in the blanks
Electric toasters and electric irons get hot when switched on because of the _______ effect of current.
A fuse is a _____ device.
In an electric bulb the filament is made of ______
A pivoted magnetic needle will always point to the ________ direction.
________ and ________ carry the electric current wherever it is needed.
cables and wire
Fibers and Plastic
Coal is a ________ fuel
In Nuclear power stations, splitting of ________ produces energy, which is used to heat water
In hydro-electric power stations, _______ is used to turn the turbines.
fast flouring water
Electric current is the flow of ______
______ is improved the first electric cell developed by Luigi Galvani.
Primary cells _______ recharged.
Secondary cells ________ recharged.
When the current flows the circuit is said to be _______ , when the current does not flow, the circuit is said to be ________
When current passes through a wire it gets ______
________ is an instrument used to detect the flow of current in electrical circuits.
The amount of heat produced depends on the _______ and _______ of current flow.
Nichrome is an alloy of ________ and _____
Nickel and Chromium
Pottasium and magnesium
________ can be reset manually or automatically to restore.
Many toys have ________ inside.
Match the following
- Electric cell a. Flow of charge
- Fuse wire b. Source of electric current
- Insulators c. Electromagnet
- Electric bell d. Prevents damage of electric appliances.
- Electric current e. Do not allow current to pass through them
1 5 4 3 2
5 1 4 2 3
4 3 2 5 1
2 5 1 3 4
Match the following
- Electric Bell a. Glass
- Oersted b. Earth
- Insulator c. Cell phone
- Conductor d. Electromagnet
- Storage cell e. Magnetic effect of current
5 4 3 2 1
3 4 5 1 2
1 5 4 3 2
4 5 3 2 1
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There are 46 questions to complete.