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

1

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

1

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

2

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 student wishes to measure accurately the volume of approximately 40 cm³ of water. She has two measuring cylinders, a larger one that can hold 100 c...

2014 Summer

Theory

CH2 - FORCES AND MOTION

Which distance/time graph represents the motion of an object moving at constant speed? [Image_1: Graphs A, B, C, D with axes for distance and time]

2014 Summer

Theory

CH2 - FORCES AND MOTION

The graph shows how the speed of a car changes with time. Which calculation gives the distance travelled by the car in 24 seconds?A. $\left(\frac{14}{...

2014 Summer

Theory

CH1 - MEASUREMENTS AND UNITS

Which instrument is used to compare the masses of objects? A. a balance B. a barometer C. a manometer D. a measuring cylinder

2014 Summer

Theory

CH1 - MEASUREMENTS AND UNITS

A liquid has a volume of $100 \text{cm}^3$ and a mass of $85 \text{g}$.The density of water is $1.0 \text{g/cm}^3$.How does the density of the liquid ...

2014 Summer

Theory

CH3 - FORCES AND PRESSURE

A plane lamina with centre of mass X touches the ground at point P.Which diagram shows the lamina in equilibrium?

2014 Summer

Theory

CH3 - FORCES AND PRESSURE

A student adds weights to an elastic cord. He measures the length of the cord for each weight.He then plots a graph from the results, as shown.What ha...

2014 Summer

Theory

CH4 - FORCES AND ENERGY

Which energy transfer takes place when a matchstick burns?A. chemical to thermalB. chemical to nuclearC. nuclear to chemicalD. thermal to chemical

2014 Summer

Theory

CH4 - FORCES AND ENERGY

Four cars are driven along a road.The table shows the work done by the engine in each car and the time taken by each car.Which engine produces the mos...

2014 Summer

Theory

CH3 - FORCES AND PRESSURE

Which situation is an example of a force acting over a large area to produce a small pressure?A. a builder hammering a nail into a piece of woodB. a c...

2014 Summer