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

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

Theory

CH9 - MAGNETS AND CURRENTS

A wire perpendicular to the page carries an electric current in a direction out of the page. There are four compasses near the wire. Which compass sh...

2009 Summer

Theory

CH9 - MAGNETS AND CURRENTS

A transformer has 50 turns on its primary coil and 100 turns on its secondary coil. An alternating voltage of 25.0 V is connected across the primary c...

2009 Summer

Theory

CH9 - MAGNETS AND CURRENTS

A permanent magnet is brought near to a piece of copper. The copper is not attracted by the magnet. Why is there no attraction? A Copper is ferrous ...

2009 Winter

Theory

CH9 - MAGNETS AND CURRENTS

Four plotting compasses are placed in the magnetic field of two identical bar magnets as shown in the diagram.Which compass is shown pointing in the w...

2009 Winter

Theory

CH9 - MAGNETS AND CURRENTS

Which device is designed to allow a small direct current (d.c.) to control a large direct current (d.c.)?A. a generatorB. a motorC. a relayD. a transf...

2009 Winter

Theory

CH9 - MAGNETS AND CURRENTS

A transformer is to be used to provide a 10 V output from a 100 V supply.What are suitable numbers of turns for the primary coil and for the secondary...

2009 Winter

Theory

CH9 - MAGNETS AND CURRENTS

A permanent magnet is brought near to a piece of copper. The copper is not attracted by the magnet. Why is there no attraction? A. Copper is ferrous b...

2009 Winter

Theory

CH9 - MAGNETS AND CURRENTS

Four plotting compasses are placed in the magnetic field of two identical bar magnets as shown in the diagram.Which compass is shown pointing in the w...

2009 Winter

Theory

CH1 - MEASUREMENTS AND UNITS

The diagrams show the readings on a measuring cylinder before and after a small metal cube is added.How many more identical cubes can be added to the ...

2013 Summer

Theory

CH2 - FORCES AND MOTION

Which person is experiencing an acceleration?A. a driver of a car that is braking to stop at traffic lightsB. a passenger in a train that is stationar...

2013 Summer

Theory

CH2 - FORCES AND MOTION

A car travels at various speeds during a short journey. The table shows the distances travelled and the times taken during each of four stages P, Q, R...

2013 Summer

Theory

CH2 - FORCES AND MOTION

Two blocks of metal X and Y hang from spring balances, as shown in the diagrams. What does the diagram show about X and Y? A They have the same mas...

2013 Summer

Theory

CH2 - FORCES AND MOTION

A 1 kg sample of aluminium is stored in a laboratory. In a different laboratory, in the same town, there is a 1 kg sample of iron.Which quantity must ...

2013 Summer

Theory

CH1 - MEASUREMENTS AND UNITS

A measuring cylinder has a mass of 120g when empty.When it contains 50cm3 of a liquid, the total mass of the measuring cylinder and the liquid is 160g...

2013 Summer

Theory

CH2 - FORCES AND MOTION

A car moves along a level road.The diagram shows all of the horizontal forces acting on the car.Which statement is correct?A. The car is slowing down....

2013 Summer

Theory

CH3 - FORCES AND PRESSURE

The diagram shows a force being applied to a lever to lift a heavy weight. Which change would enable the heavy weight to be lifted with a smaller forc...

2013 Summer

Theory

CH4 - FORCES AND ENERGY

The diagram shows a hydroelectric system. What are the main energy changes taking place?A. chemical energy \(\rightarrow\) kinetic energy \(\rightarro...

2013 Summer

Theory

CH4 - FORCES AND ENERGY

An escalator (moving stairs) and a lift (elevator) are both used to carry passengers from the same underground railway platform up to street level.The...

2013 Summer