Theory

CH10 - ELECTRON AND ELECTRONICS

Fig. 11.1 shows the main components of a cathode-ray oscilloscope.(a) State the purpose of(i) the heater,................................................

2011 Winter

1

Theory

CH10 - ELECTRON AND ELECTRONICS

When no circuit is connected to the input of a cathode-ray oscilloscope (CRO), there is a horizontal trace across the middle of the screen.Fig. 11.1 s...

2010 Winter

1

Theory

CH10 - ELECTRON AND ELECTRONICS

(a) In the space below, draw the symbol for an OR gate.[1](b) Describe the action of an OR gate in terms of its inputs and outputs.......................

2011 Summer

2

Theory

CH10 - ELECTRON AND ELECTRONICS

In a cathode-ray tube, a hot tungsten cathode releases particles by thermionic emission.What are these particles?A. $\alpha$-particlesB. electronsC. p...

2009 Summer

3

Theory

CH10 - ELECTRON AND ELECTRONICS

The diagram shows a cathode-ray tube. A student wants the cathode rays to make a spot at P on the screen. Which parts of the cathode-ray tube should...

2009 Summer

2

Theory

CH10 - ELECTRON AND ELECTRONICS

An electric field is set up between two parallel plates.An image is shown with cathode rays directed into this field, parallel to the plates: In which...

2010 Winter

1

Theory

CH10 - ELECTRON AND ELECTRONICS

Cathode rays are emitted in a vacuum tube. They consist of particles that are found in atoms.What is the name of the particles and how are the cathode...

2011 Winter

4

Theory

CH10 - ELECTRON AND ELECTRONICS

The diagram shows a device to produce cathode rays.Which part of the device is heated and why?[Table_1]

2012 Summer

3

Theory

CH10 - ELECTRON AND ELECTRONICS

Two parallel metal plates in a vacuum are connected to the terminals of a high-voltage power supply. A beam of cathode rays is passed into the space b...

2011 Winter

2

Theory

CH10 - ELECTRON AND ELECTRONICS

A student is using a cathode-ray oscilloscope to display the waveform of an alternating current supply. The arrangement is shown in Fig. 10.1.When swi...

2010 Summer

3

Theory

CH1 - MEASUREMENTS AND UNITS

A metre rule is used to measure a length.Which reading is shown to the nearest millimetre?A 0.7 mB 0.76 mC 0.761 mD 0.7614 m

2009 Summer

2

Theory

CH2 - FORCES AND MOTION

The graph represents the movement of a body. [Image_1: Graph of speed (m/s) vs time (s)] How far has the body moved after 5s? A 2m B 10m C 25m D...

2009 Summer

2

Theory

CH2 - FORCES AND MOTION

A car travels 100 km. The highest speed of the car is 90 km/h, and the lowest speed is 30 km/h. The journey takes two hours.What is the average speed ...

2009 Summer

2

Theory

CH2 - FORCES AND MOTION

Which statement about the masses and weights of objects on the Earth is correct?A. A balance can only be used to compare weights, not masses.B. Heavy ...

2009 Summer

2

Theory

CH2 - FORCES AND MOTION

The table shows the weight in newtons of a 10 kg mass on each of four planets. [Table_1] | planet | weight of a 10 kg mass / N | |----------|----...

2009 Summer

2

Theory

CH1 - MEASUREMENTS AND UNITS

Which items of apparatus are required to determine the density of a liquid? A balance and measuring cylinder B balance and thermometer C metre rule...

2009 Summer

2

Theory

CH2 - FORCES AND MOTION

Which property of an object cannot be changed by a force?A. its massB. its motionC. its shapeD. its size

2009 Summer

2

Theory

CH3 - FORCES AND PRESSURE

A wooden plank rests in equilibrium on two boulders on opposite sides of a narrow stream. Three forces of size $P$, $Q$ and $R$ act on the plank. How ...

2009 Summer

2

Theory

CH4 - FORCES AND ENERGY

Electricity can be obtained from different energy resources.Which energy resource is used to obtain electricity without producing heat to boil water?A...

2009 Summer

2

Theory

CH4 - FORCES AND ENERGY

Four people of equal weight on a beach use different routes to get to the top of a sea wall. Which person produces the greatest average power?[Table_1...

2009 Summer

2