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 quantity can be measured in electronvolts (eV)?

2014 Summer

2

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The unit of specific heat capacity is $\text{J kg}^{-1} \text{K}^{-1}$.What is its equivalent in terms of SI base units?

2014 Summer

2

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

What is the vertical component of this displacement vector?

2014 Summer

2

MCQ

CH2 - MEASUREMENT TECHNIQUES

The resistance of a lamp is calculated from the value of the potential difference (p.d.) across it and the value of the current passing through it.Whi...

2014 Summer

2

MCQ

CH2 - MEASUREMENT TECHNIQUES

The display on a cathode-ray oscilloscope shows the signal produced by an electronic circuit. The time-base is set at 5.0 ns per division and the Y-ga...

2014 Summer

2

MCQ

CH2 - MEASUREMENT TECHNIQUES

A digital caliper is used to measure the 28.50 mm width of a plastic ruler. The digital caliper reads to the nearest 0.01 mm. What is the correct way...

2014 Summer

2

MCQ

CH3 - KINEMATICS

An experiment is performed to measure the acceleration of free fall $g$. A body falls between two fixed points. The four measurements shown below are ...

2014 Summer

2

MCQ

CH3 - KINEMATICS

In a cathode-ray tube, an electron is accelerated uniformly in a straight line from a speed of $4 \times 10^{3} \: \text{ms}^{-1}$ to $2 \times 10^{7}...

2014 Summer

2

MCQ

CH3 - KINEMATICS

The graph shows how the speed $v$ of a sprinter changes with time $t$ during a 100 m race. What is the best estimate of the maximum acceleration of...

2014 Summer

2

MCQ

CH4 - DYNAMICS

A tennis ball is dropped onto a table and bounces back up. The table exerts a force F on the ball. Which graph best shows the variation with time t o...

2014 Summer

2