Theory

CH21 - ELECTRONICS

(a) By reference to an amplifier, explain what is meant by \textit{negative feedback}....................................................................

2009 Summer

Theory

CH21 - ELECTRONICS

An amplifier incorporating an operational amplifier (op-amp) has three inputs A, B and C, as shown in Fig. 9.1.Negative feedback is provided by the re...

2009 Winter

Theory

CH21 - ELECTRONICS

(a) (i) On Fig. 9.1, mark, with the letter X, the virtual earth. [1](ii) Explain what is meant by a virtual earth........................................

2010 Summer

Theory

CH21 - ELECTRONICS

(a) Negative feedback may be used in amplifier circuits. State(i) what is meant by negative feedback,....................................................

2010 Summer

Theory

CH21 - ELECTRONICS

(a) Negative feedback may be used in amplifier circuits. State(i) what is meant by \textit{negative feedback},...........................................

2010 Summer

Theory

CH21 - ELECTRONICS

An amplifier circuit incorporating an operational amplifier (op-amp) is shown in Fig. 9.1.Fig. 9.1(a) State(i) the name of this type of amplifier circ...

2010 Winter

Theory

CH21 - ELECTRONICS

An amplifier circuit incorporating an operational amplifier (op-amp) is shown in Fig. 9.1.[Image_1: Diagram showing an operational amplifier circuit]F...

2010 Winter

Theory

CH21 - ELECTRONICS

(a) State three properties of an ideal operational amplifier (op-amp).1. ................................................................................

2010 Winter

Theory

CH21 - ELECTRONICS

(a) An operational amplifier (op-amp) may be used as a comparator. State the function of a comparator....................................................

2011 Summer

Theory

CH21 - ELECTRONICS

(a) State two effects of negative feedback on the gain of an amplifier incorporating an operational amplifier (op-amp). 1. .............................

2011 Winter

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

Which quantity with its unit is correct?

2016 Summer

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The luminosity $L$ of a star is given by $L = 4\pi r^2 \sigma T^4$ where $r$ is the radius of the star, $T$ is the temperature of the star, $\sig...

2016 Summer

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The diagram shows two vectors X and Y, drawn to scale. If X = Y − Z, which diagram best represents the vector Z?

2016 Summer

MCQ

CH2 - MEASUREMENT TECHNIQUES

The diagram shows a cathode-ray oscilloscope (c.r.o.) being used to measure the rate of rotation of a flywheel.The flywheel has a small magnet M mount...

2016 Summer

MCQ

CH2 - MEASUREMENT TECHNIQUES

A student determines the density $\rho$ of steel by taking measurements from a steel wire. mass $m = 6.2 \pm 0.1 \text{ g}$ length $l = 25.0 \pm 0.1 \...

2016 Summer

MCQ

CH3 - KINEMATICS

The acceleration of free fall on the Moon is $1.6 \, \text{m}\,\text{s}^{-2}$. The Moon has no atmosphere. An astronaut standing on the surface of the...

2016 Summer

MCQ

CH3 - KINEMATICS

A tennis ball is released from rest at the top of a tall building. Which graph best represents the variation with time $t$ of the acceleration $a$ of ...

2016 Summer

MCQ

CH3 - KINEMATICS

The graph shows how the velocity $v$ of an object moving in a straight line varies with time $t$ from $t = 0$ to $t = T$. Which graph represents th...

2016 Summer

MCQ

CH4 - DYNAMICS

A ball falls vertically onto horizontal ground and rebounds, as shown. The ball has momentum $p_1$ downwards just before hitting the ground. After ...

2016 Summer

MCQ

CH4 - DYNAMICS

A sphere falls from rest through the air. The graph shows the variation with time of the sphere’s velocity. Which diagram shows the forces ac...

2016 Summer