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

Which is an SI base unit?

2015 Summer

2

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

Which pair contains one vector and one scalar quantity?

2015 Summer

2

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

When a constant braking force is applied to a vehicle moving at speed $v$, the distance $d$ moved by the vehicle in coming to rest is given by the exp...

2015 Summer

4

MCQ

CH2 - MEASUREMENT TECHNIQUES

A whale produces sound waves of frequency 5 Hz. The waves are detected by a microphone and displayed on an oscilloscope. What is the time-base setting...

2015 Summer

2

MCQ

CH2 - MEASUREMENT TECHNIQUES

The angular deflection of the needle of an ammeter varies with the current in the ammeter as shown in the graph. Which diagram could represent the ap...

2015 Summer

2

MCQ

CH2 - MEASUREMENT TECHNIQUES

The strain energy $W$ of a spring is determined from its spring constant $k$ and extension $x$. The spring obeys Hooke's law and the value of $W$ is c...

2015 Summer

2

MCQ

CH3 - KINEMATICS

A sphere is released and falls. Its initial acceleration reduces until it eventually begins to travel at constant terminal velocity. Which displacemen...

2015 Summer

3

MCQ

CH3 - KINEMATICS

An insect jumps with an initial vertical velocity of 1.0 $\text{m s}^{-1}$, reaching a maximum height of 3.5 $\times 10^{-2} \text{m}$. Assume the dec...

2015 Summer

2

MCQ

CH3 - KINEMATICS

A body having uniform acceleration $a$ increases its velocity from $u$ to $v$ in time $t$. Which expression would not give a correct value for the bo...

2015 Summer

4

MCQ

CH4 - DYNAMICS

What is a reasonable estimate of the average gravitational force acting on a fully grown woman standing on the Earth?

2015 Summer

2