Theory

CH24 - ALTERNATING CURRENTS

A sinusoidal alternating voltage is to be rectified. (a) Suggest one advantage of full-wave rectification as compared with half-wave rectification.&n...

2009 Winter

Theory

CH24 - ALTERNATING CURRENTS

A student is asked to design a circuit by which a direct voltage of peak value 9.0V is obtained from a 240V alternating supply. The student uses a tra...

2010 Summer

Theory

CH24 - ALTERNATING CURRENTS

(a) Explain what is meant by the $\textit{root-mean-square}$ (r.m.s.) value of an alternating voltage.  [2] (b) An alternating voltage $V$ is re...

2010 Summer

Theory

CH24 - ALTERNATING CURRENTS

The variation with time $t$ of the current $I$ in a resistor is shown in Fig. 6.1. The variation of the current with time is sinusoidal. (a) Expla...

2010 Winter

Theory

CH24 - ALTERNATING CURRENTS

An alternating current supply is connected in series with a resistor R, as shown in Fig. 6.1. The variation with time $t$ (measured in seconds) of ...

2011 Summer

Theory

CH24 - ALTERNATING CURRENTS

An alternating current supply is connected in series with a resistor R, as shown in Fig. 6.1. The variation with time $t$ (measured in seconds) of ...

2011 Summer

Theory

CH24 - ALTERNATING CURRENTS

The variation with time $t$ of the output $V$ of an alternating voltage supply of frequency 50 Hz is shown in Fig. 6.1.(a) Use Fig. 6.1 to state (i) t...

2011 Winter

Theory

CH24 - ALTERNATING CURRENTS

The variation with time $t$ of the output $V$ of an alternating voltage supply of frequency 50 Hz is shown in Fig. 6.1. (a) Use Fig. 6.1 to state ...

2011 Winter

Theory

CH24 - ALTERNATING CURRENTS

The components for a bridge rectifier are shown in Fig. 5.1. (a) Complete the circuit of Fig. 5.1 by showing the connections of the supply and of t...

2011 Winter

Theory

CH24 - ALTERNATING CURRENTS

A sinusoidal alternating voltage supply is connected to a bridge rectifier consisting of four ideal diodes. The output of the rectifier is connected t...

2012 Summer

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

Which quantity can be measured in electronvolts (eV)?

2014 Summer

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

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

What is the vertical component of this displacement vector?

2014 Summer

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

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

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

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

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

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

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