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 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

Theory

CH2 - FORCES AND MOTION

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

2011 Summer

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

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

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

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

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