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

Theory

CH1 - PHYSICAL QUANTITIES & UNITS

(a) State what is meant by a $\text{scalar}$ quantity and by a $\text{vector}$ quantity. [2] (b) Complete Fig. 1.1 to indicate whether each of t...

2018 Summer

Theory

CH3 - KINEMATICS

(a) State what is meant by the mass of a body. [1] (b) Two blocks travel directly towards each other along a horizontal, frictionless surface. T...

2018 Summer

Theory

CH14 - WAVES

(a) For a progressive wave, state what is meant by (i) the period,   [1] (ii) the wavelength.   [1] (b) Fig. 4.1 shows the vari...

2018 Summer

Theory

CH14 - WAVES

(a) When monochromatic light is incident normally on a diffraction grating, the emergent light waves have been diffracted and are coherent. Explain w...

2018 Summer

Theory

CH19 - CURRENT OF ELECTRICITY

(a) Define the volt............................................................................................................... [1](b) A battery of...

2018 Summer

Theory

CH17 - ELECTRIC FIELDS

A $\beta^{-}$ particle from a radioactive source is travelling in a vacuum with kinetic energy 460 eV. The particle enters a uniform electric field at...

2018 Summer

Theory

CH1 - PHYSICAL QUANTITIES & UNITS

(a) Define force. .....................................................................................................................[1] (b) State...

2018 Summer

Theory

CH3 - KINEMATICS

(a) State the principle of conservation of momentum. [2] (b) A stationary firework explodes into three different fragments that move in a horizontal ...

2018 Summer

Theory

CH3 - KINEMATICS

A child on a sledge slides down a steep hill and then travels in a straight line up an ice-covered slope, as illustrated in Fig. 3.1. The sledge pa...

2018 Summer

Theory

CH14 - WAVES

(a) (i) Define the wavelength of a progressive wave.   [1] (ii) State what is meant by an antinode of a stationary wave.   [1] (...

2018 Summer