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