Theory

CH16 - COMMUNICATION

(a) State what is meant by the \textit{amplitude modulation (AM)} of a radio wave........................................................................

2021 Summer

3

Theory

CH16 - COMMUNICATION

(a) State two advantages of converting the signal into digital form for transmission.1. .................................................................

2021 Winter

3

Theory

CH16 - COMMUNICATION

(a) A sinusoidal carrier wave has a constant amplitude and a frequency of 1.2 MHz. The carrier wave is modulated by a signal wave such that a 1.0 V di...

2021 Summer

2

Theory

CH16 - COMMUNICATION

(a) (i) When audio signals are transmitted over long distances, modulation of radio waves is used.Suggest a reason why modulation is used...............

2021 Winter

3

Theory

CH16 - COMMUNICATION

(a) State what is meant by the amplitude modulation (AM) of a radio wave.................................................................................

2021 Summer

3

Theory

CH16 - COMMUNICATION

An analogue signal is to be transmitted to a receiver. Before transmission, the signal passes through an analogue-to-digital converter (ADC). After tr...

2021 Winter

3

Theory

CH16 - COMMUNICATION

(a) (i) By reference to an ultrasound wave, explain what is meant by specific acoustic impedance.........................................................

2020 Summer

4

Theory

CH16 - COMMUNICATION

(a) The transmission of signals using optic fibres has, to a great extent, replaced the use of coaxial cables.Advantages of optic fibres include great...

2020 Summer

4

Theory

CH16 - COMMUNICATION

(a) (i) By reference to an ultrasound wave, explain what is meant by specific acoustic impedance.........................................................

2020 Summer

4

Theory

CH16 - COMMUNICATION

(a) Explain the principles of the \textbf{generation} of ultrasound waves for use in medical diagnosis...................................................

2020 Winter

4

Theory

CH2 - MEASUREMENT TECHNIQUES

Measurements made for a sample of metal wire are shown in Fig. 1.1. Fig. 1.1 (a) State the appropriate instruments used to make each of these meas...

2011 Summer

2

Theory

Kinetic Energy

(a) Explain what is meant by work done. [1] (b) A car is travelling along a road that has a uniform downhill gradient, as shown in Fig. 2.1. ...

2011 Summer

3

Theory

CH5 - FORCES, DENSITY & PRESSURE

(a) Explain what is meant by centre of gravity. (b) Define moment of a force. (c) A student is being weighed. The student, of weight $W$, stands 0.3...

2011 Summer

3

Theory

CH9 - DEFORMATION OF SOLIDS

(a) Define, for a wire, (i) stress,    [1] (ii) strain.    [1] (b) A wire of length 1.70 m hangs vertically from a fixed point,...

2011 Summer

3

Theory

CH20 - D.C. CIRCUITS

(a) A variable resistor is used to control the current in a circuit, as shown in Fig. 5.1. The variable resistor is connected in series with a 12V po...

2011 Summer

1

Theory

CH5 - FORCES, DENSITY & PRESSURE

(a) State two assumptions of the simple kinetic model of a gas.   [2] (b) Use the kinetic model of gases and Newton's laws of motion to exp...

2011 Summer

3

Theory

CH15 - SUPERPOSITION

(a) Explain the term interference.   [1] (b) A ripple tank is used to demonstrate interference between water waves. Describe (i) the appa...

2011 Summer

2

Theory

CH1 - PHYSICAL QUANTITIES & UNITS

(a) Distinguish between scalar quantities and vector quantities. [2] (b) In the following list, underline all the scalar quantities. accelerati...

2011 Summer

4

Theory

CH1 - PHYSICAL QUANTITIES & UNITS

(a) A sphere of radius $R$ is moving through a fluid with constant speed $v$. There is a frictional force $F$ acting on the sphere, which is given by ...

2011 Summer

2

Theory

Potential Energy

(a) (i) Explain what is meant by work done. [1] (ii) Define power. [1] (b) Fig. 3.1 shows part of a fairground ride with a carriage on rai...

2011 Summer

2