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

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The SI unit for potential difference (the volt) is given, in base units, by

2010 Summer

1

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The product of pressure and volume has the same SI base units as

2010 Summer

3

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

An ion is accelerated by a series of electrodes in a vacuum. A graph of the power supplied to the ion is plotted against time.What is represented by t...

2010 Summer

1

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

A vector quantity $V$ is resolved into two perpendicular components $X$ and $Y$. The angle between $V$ and component $X$ is $\theta$. The angle betwee...

2010 Summer

1

MCQ

CH3 - KINEMATICS

The diagram shows a velocity-time graph for a vehicle. The vehicle, moving at 4.0 ms-1, begins to accelerate at time = 0. What is the vehicle's ac...

2010 Summer

2

MCQ

CH3 - KINEMATICS

A small steel ball falls freely under gravity after being released from rest. Which graph best represents the variation of the height $h$ of the ball...

2010 Summer

1

MCQ

CH4 - DYNAMICS

Two equal masses travel towards each other on a frictionless air track at speeds of $60 \text{ cm s}^{-1}$ and $40 \text{ cm s}^{-1}$. They stick toge...

2010 Summer

2

MCQ

CH4 - DYNAMICS

A brick weighing 20 N rests on an inclined plane. The weight of the brick has a component of 10 N parallel with the plane. The brick also experiences ...

2010 Summer

2

MCQ

CH4 - DYNAMICS

The diagram shows two identical spheres X and Y. Initially, X moves with speed v directly towards Y. Y is stationary. The spheres collide elastical...

2010 Summer

3

MCQ

CH5 - FORCES, DENSITY & PRESSURE

Forces of 3 N, 4 N and 5 N act at one point on an object. The angles at which the forces act can vary. What is the value of the minimum resultant for...

2010 Summer

3