Theory

CH24 - ALTERNATING CURRENTS

(a) State what is meant by the frequency of an alternating current. ....................................................................................

2024 Winter

5

Theory

CH24 - ALTERNATING CURRENTS

A circuit contains a power supply that provides a sinusoidal alternating input voltage $V_{IN}$. There is an output voltage $V_{OUT}$ across a load re...

2024 Summer

7

Theory

CH24 - ALTERNATING CURRENTS

(a) State the purpose of the circuit in Fig. 7.1.........................................................................................................

2024 Summer

4

Theory

CH24 - ALTERNATING CURRENTS

A varying current $I$ passes through a resistor of resistance $R$ in the circuit shown in Fig. 7.1.Fig. 7.2 shows the variation with time $t$ of $I$.T...

2023 Winter

4

Theory

CH24 - ALTERNATING CURRENTS

Four diodes are used in a bridge rectifier circuit to produce rectification of a sinusoidal a.c. input voltage $V_{IN}$. Fig. 7.1 shows part of the ci...

2023 Summer

7

Theory

CH24 - ALTERNATING CURRENTS

An electron in a metal rod moves randomly about a mean position. When an alternating voltage is applied to the ends of the rod, the mean position can ...

2023 Winter

4

Theory

CH24 - ALTERNATING CURRENTS

A varying current $I$ passes through a resistor of resistance $R$ in the circuit shown in Fig. 7.1.[Image_1: Fig. 7.1]Fig. 7.2 shows the variation wit...

2023 Winter

3

Theory

CH24 - ALTERNATING CURRENTS

Fig. 5.1 shows four diodes and a load resistor of resistance 1.2 kΩ, connected in a circuit that is used to produce rectification of an alternating v...

2022 Summer

4

Theory

CH24 - ALTERNATING CURRENTS

(a) A sinusoidal alternating voltage has a root-mean-square (r.m.s.) potential difference (p.d.) of 4.2 V and a frequency of 50 kHz.(i) The alternatin...

2022 Winter

4

Theory

CH24 - ALTERNATING CURRENTS

Fig. 5.1 shows four diodes and a load resistor of resistance 1.2 kΩ, connected in a circuit that is used to produce rectification of an alternating v...

2022 Summer

5

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

3

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