Theory

CH9 - MAGNETS AND CURRENTS

(a) The transformer in Fig. 8.1 is used to convert 240V a.c. to 6V a.c.Fig. 8.1(i) Using the information above, calculate the number of turns on the s...

2010 Summer

2

Theory

CH9 - MAGNETS AND CURRENTS

(a) Fig. 9.1 illustrates the left hand rule, which helps when describing the force on a current-carrying conductor in a magnetic field.Fig. 9.1One dir...

2010 Summer

1

Theory

CH9 - MAGNETS AND CURRENTS

(a) In Fig. 8.1, a magnet is moving towards one end of a solenoid connected to a sensitive centre-zero meter. During this movement a current is induce...

2011 Winter

3

Theory

CH9 - MAGNETS AND CURRENTS

The north pole of a bar magnet is placed next to end P of an iron bar PQ, as shown. As a result, magnetic poles are induced in the iron bar. [Image_1...

2009 Summer

2

Theory

CH9 - MAGNETS AND CURRENTS

An electromagnet is used to separate magnetic metals from non-magnetic metals. Why is steel unsuitable as the core of the electromagnet?A It forms a p...

2009 Summer

2

Theory

CH9 - MAGNETS AND CURRENTS

Which statement about a magnet is not correct?A. It can attract another magnet.B. It can attract an unmagnetised piece of iron.C. It can repel another...

2010 Winter

2

Theory

CH9 - MAGNETS AND CURRENTS

A chain of steel nails and a chain of iron nails hang from a strong magnet. The chains are then carefully removed from the magnet.What happens to the ...

2010 Winter

2

Theory

CH9 - MAGNETS AND CURRENTS

Four nails, A, B, C and D, are tested to find which makes the strongest permanent magnet.One of the nails is placed against a bar magnet and the numbe...

2011 Winter

3

Theory

CH9 - MAGNETS AND CURRENTS

A horseshoe magnet is brought near to an unmagnetised iron bar. [Image_1: Diagram of horseshoe magnet with labeled N and S poles near an iron bar] W...

2011 Winter

3

Theory

CH9 - MAGNETS AND CURRENTS

Which diagram represents the direction of the magnetic field around a straight wire carrying a current out of the page?

2011 Winter

4

Theory

CH1 - MEASUREMENTS AND UNITS

A cylindrical can is rolled along the ruler shown in the diagram.The can rolls over twice.What is the circumference (distance all round) of the can?A ...

2012 Summer

2

Theory

CH2 - FORCES AND MOTION

A car is moving downhill along a road at a constant speed. Which graph is the speed/time graph for the car?

2012 Summer

2

Theory

CH2 - FORCES AND MOTION

In a race, a car travels 60 times around a 3.6 km track. This takes 2.4 hours.What is the average speed of the car?A 1.5 km/h B 90 km/h C 144 km/h D 2...

2012 Summer

3

Theory

CH3 - FORCES AND PRESSURE

Which quantity is measured in newtons? A) density B) energy C) pressure D) weight

2012 Summer

2

Theory

CH3 - FORCES AND PRESSURE

A geologist places a small rock on the left-hand pan of a balance. The two pans are level as shown when masses with a total weight of 23 N are placed ...

2012 Summer

2

Theory

CH1 - MEASUREMENTS AND UNITS

A stone has a volume of 0.50 cm3 and a mass of 2.0 g.What is the density of the stone?A. 0.25 g/cm3B. 1.5 g/cm3C. 2.5 g/cm3D. 4.0 g/cm3

2012 Summer

1

Theory

CH2 - FORCES AND MOTION

Passengers are not allowed to stand on the upper deck of double-decker buses.upper decklower deckWhy is this?A. They would cause the bus to become les...

2012 Summer

1

Theory

CH3 - FORCES AND PRESSURE

The diagram shows a handle with three forces, each 100 N, applied to it. The handle is free to move.What is the effect of the forces on the handle?A T...

2012 Summer

3

Theory

CH4 - FORCES AND ENERGY

In which pair of energy sources are both sources renewable?A. oil and coalB. oil and tidalC. tidal and geothermalD. tidal and nuclear fission

2012 Summer

1

Theory

CH4 - FORCES AND ENERGY

An object on a thread is swinging between X and Z, as shown in the diagram. It is momentarily at rest at X and at Z.An incomplete word equation about ...

2012 Summer

2