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

4

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

4

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

4

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 geologist compares the volumes of three rocks, X, Y and Z. Three measuring cylinders contain different volumes of water. He places each rock into on...

2015 Summer

1

Theory

CH2 - FORCES AND MOTION

A car moves with constant speed and then constant acceleration.Which graph is the speed-time graph for the car?[Image_1: Graphs A, B, C, D]

2015 Summer

1

Theory

CH2 - FORCES AND MOTION

A car travels 100 km. The journey takes two hours. The highest speed of the car is 80 km/h, and the lowest speed is 40 km/h. What is the average spee...

2015 Summer

1

Theory

CH2 - FORCES AND MOTION

Diagram 1 shows a piece of foam rubber that contains many pockets of air. Diagram 2 shows the same piece of foam rubber after it has been compressed s...

2015 Summer

1

Theory

CH1 - MEASUREMENTS AND UNITS

A metal block has the dimensions shown. Its mass is 1000 g.What is the density of the metal?A $\left(\frac{5 \times 10}{1000 \times 2}\right)$ g/cm$^3...

2015 Summer

1

Theory

CH3 - FORCES AND PRESSURE

Four objects are each acted on by only two forces, as shown.Which object is in equilibrium?

2015 Summer

1

Theory

CH3 - FORCES AND PRESSURE

A student measures the length of a spring. She then hangs different weights from the spring. She measures the length of the spring for each different ...

2015 Summer

1

Theory

CH4 - FORCES AND ENERGY

Which energy resource is used to generate electricity without using any moving parts?A. geothermalB. hydroelectricC. nuclearD. solar

2015 Summer

1

Theory

CH4 - FORCES AND ENERGY

A cyclist travels down a hill from rest at point X, without pedalling.The cyclist applies his brakes and the cycle stops at point Y.Which energy chang...

2015 Summer

1

Theory

CH3 - FORCES AND PRESSURE

The diagram shows a simple mercury barometer.Which height is used as a measurement of atmospheric pressure?

2015 Summer

1