Electricity and Magnetism

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Test your knowledge of electricity and magnetism!

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pey pey

Malasia

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Electricity and Magnetism


Electricity and MagnetismVersión en línea Test your knowledge of electricity and magnetism! por pey pey 1 What is the S.I. unit of energy? a Watt (W) b Ampere (A) c Joule (J) d Volt (V) 2 Which of the following is a renewable source of energy? a Coal b Oil c Wind d Natural gas 3 Which forms of energy are present when boiling water? a Heat and kinetic energy b Light and sound energy c Nuclear and elastic potential energy d Gravitational and magnetic energy 4 When two different objects are rubbed together, what happens? a Electrons move between them b Protons move between them c Both protons and electrons move d No charges are transferred 5 Why does lightning occur? a Movement of water vapour in the clouds b Friction between clouds and air causing charge separation c The Sun’s heat causing clouds to collide d Earth’s magnetic field attracting clouds 6 What is the function of an electroscope? a Measure voltage b Produce electric current c Store electric charges d Detect electric charges 7 Which statement about charges is correct? a Same charges attract b Opposite charges repel c Same charges repel d Charges have no force 8 A comb rubbed with woollen cloth will become: a Positively charged b Negatively charged c Neutral d Uncharged 9 How can dust attraction to a TV screen due to electrostatic charges be reduced? a Use a woollen cloth b Use a microfibre cloth c Spray with water d Rub with a plastic bag 10 Electric current is defined as: a Voltage per unit charge b The rate of flow of electric charges c Resistance per unit charge d The amount of energy stored in a circuit 11 Which instrument measures voltage, and how is it connected? a Ammeter, in series b Ammeter, in parallel c Voltmeter, in series d Voltmeter, in parallel 12 According to Ohm’s Law, if resistance increases and voltage stays the same: a Current increases b Current stays the same c Current decreases d Voltage increases 13 What is the resistance of a device that uses 0.5 A from a 12 V supply? a 6 Ω b 24 Ω c 0.0417 Ω d 2.4 Ω 14 In a series circuit, if one component is removed: a Other components work normally b The whole circuit stops working c Voltage increases d Current increases 15 Which is an advantage of a parallel circuit? a All components share the same current b If one appliance fails, others still work c It is cheaper to wire d Voltage can be adjusted for each appliance 16 In a parallel circuit, the total current is: a The same in each branch b The sum of the current in each branch c Zero d The same as the smallest branch current 17 What happens when like poles of a magnet are brought together? a They attract b They repel c They lose magnetism d They form a stronger magnet 18 Magnetic field lines around a bar magnet: a Begin at the south pole and end at the north pole b Begin at the north pole and end at the south pole c Cross each other frequently d Are random 19 The right-hand grip rule is used to find: a Direction of current flow in a battery b Direction of magnetic field around a current-carrying conductor c Voltage direction in a circuit d Polarity of a magnet 20 Which factor increases the strength of an electromagnet? a Using a wooden core b Increasing the number of coils c Reducing the number of coils d Using a thinner copper wire 21 Which of the following is a use of electromagnets? a Refrigerator magnets b Magnetic compasses c Lifting scrap metal d Lodestones

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Electricity and Magnetism

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Electricity and MagnetismVersión en línea

por pey pey

What is the S.I. unit of energy?

Which of the following is a renewable source of energy?

Which forms of energy are present when boiling water?

When two different objects are rubbed together, what happens?

Why does lightning occur?

What is the function of an electroscope?

Which statement about charges is correct?

A comb rubbed with woollen cloth will become:

How can dust attraction to a TV screen due to electrostatic charges be reduced?

Electric current is defined as:

Which instrument measures voltage, and how is it connected?

According to Ohm’s Law, if resistance increases and voltage stays the same:

What is the resistance of a device that uses 0.5 A from a 12 V supply?

In a series circuit, if one component is removed:

Which is an advantage of a parallel circuit?

In a parallel circuit, the total current is:

What happens when like poles of a magnet are brought together?

Magnetic field lines around a bar magnet:

The right-hand grip rule is used to find:

Which factor increases the strength of an electromagnet?

Which of the following is a use of electromagnets?