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

2

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

3

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

2

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

3

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

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

2

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

2

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

1

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

2

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

1

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

1