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

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

The diagram shows an enlarged drawing of the end of a metre rule. It is being used to measure the length of a small feather. What is the length of the...

2011 Summer

2

Theory

CH2 - FORCES AND MOTION

An object moves initially with constant speed and then with constant acceleration. Which graph shows this motion?

2011 Summer

2

Theory

CH6 - WAVES AND SOUNDS

A tennis player hits a ball hard and 0.40 s later hears the echo from a wall. The speed of sound in air is 330 m/s.How far away is the player from the...

2011 Summer

1

Theory

CH2 - FORCES AND MOTION

Which statement about mass and weight is correct?A. Mass and weight are both forces.B. Neither mass nor weight is a force.C. Only mass is a force.D. O...

2011 Summer

1

Theory

CH3 - FORCES AND PRESSURE

The diagram shows a balance being used to find the weight of a baby. The weight of the basket can be ignored.At equilibrium, the pivot is nearer to th...

2011 Summer

Theory

CH1 - MEASUREMENTS AND UNITS

A cube of side 2.0 cm is placed on a balance. What is the density of the cube? A. 0.90 g/cm³ B. 1.2 g/cm³ C. 1.8 g/cm³ D. 3.6 g/cm³

2011 Summer

1

Theory

CH3 - FORCES AND PRESSURE

Objects with different masses are hung on a spring. The diagram shows how much the spring stretches.The extension of the spring is directly proportion...

2011 Summer

Theory

CH4 - FORCES AND ENERGY

Which row gives an example of the stated form of energy?[Table_1]form of energy | exampleA gravitational | the energy due to the movement of a train a...

2011 Summer

1

Theory

CH4 - FORCES AND ENERGY

Which energy resource is used to generate electricity by first boiling water? A. hydroelectric B. nuclear fission C. tides D. waves

2011 Summer

Theory

CH4 - FORCES AND ENERGY

Two farmers use an electrically powered elevator to lift bales of hay. All the bales of hay have the same mass. As sunset approaches, they increase...

2011 Summer