Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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2730 questions · page 66 of 137 · choose a topic above to narrow them down

SA-PX-EC-0011 markL1 FoundationCalculatorECG traces

An ECG shows R peaks

0.80

s apart. Calculate the heart rate in beats per minute.

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SA-PX-EC-0021 markL1 FoundationCalculatorECG traces

A heart beats at

72

bpm. Calculate the time between R peaks in s.

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SA-PX-EC-0031 markL1 FoundationCalculatorHeart signals

The QRS complex on an ECG corresponds to

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SA-PX-EC-0041 markL1 FoundationCalculatorECG traces

Conducting gel is used between ECG electrodes and the skin to

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SA-PX-EL-0011 markL1 FoundationCalculatorSpecific charge

An electron beam passes undeflected through crossed fields:

E=2.0\times10^4

V m⁻¹ and

B=1.0\times10^{-3}

T. Calculate the electrons' speed in units of

10^7

m s⁻¹.

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SA-PX-EL-0051 markL1 FoundationCalculatorMillikan

Millikan's oil-drop experiment showed that

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SA-PX-EN-0011 markL1 FoundationCalculatorProcesses

A gas expands from

1.0\times10^{-3}

m³ to

3.0\times10^{-3}

m³ at a constant pressure of

1.0\times10^5

Pa. Calculate the work done by the gas in J.

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SA-PX-EN-0021 markL1 FoundationCalculatorProcesses

500

J of heat is supplied to a gas, which does

200

J of work. Calculate the increase in internal energy in J.

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SA-PX-EN-0041 markL1 FoundationCalculatorEfficiency

Calculate the maximum theoretical efficiency of an engine working between

800

K and

300

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SA-PX-EY-0011 markL1 FoundationCalculatorLens power

Calculate the power in dioptres of a converging lens with focal length

25

cm.

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SA-PX-EY-0041 markL1 FoundationCalculatorLens power

Two thin lenses of power

+2.0

D and

-0.5

D are placed in contact. Calculate the combined power.

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SA-PX-EY-0051 markL1 FoundationCalculatorLens power

Colour vision is provided by the

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SA-PX-NR-0012 marksL1 FoundationCalculatorNuclear radius

Using

R_0=1.2

fm, calculate the radius of a uranium-238 nucleus in fm.

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SA-PX-NR-0021 markL1 FoundationCalculatorNuclear radius

State the ratio of the radius of a nucleus with

A=216

to one with

A=27

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SA-PX-NR-0041 markL1 FoundationCalculatorReactors

In a thermal fission reactor, the moderator

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SA-PX-NR-0051 markL1 FoundationCalculatorReactors

Control rods are made from materials such as boron because they

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SA-PX-OA-0011 markL1 FoundationCalculatorAmplifiers

An inverting amplifier has

R_f=100

kΩ and

R_{in}=10

kΩ. Calculate its voltage gain.

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SA-PX-OA-0021 markL1 FoundationCalculatorAmplifiers

An input of

0.20

V is applied to that amplifier. Calculate the output voltage.

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SA-PX-OA-0031 markL1 FoundationCalculatorAmplifiers

A non-inverting amplifier has

R_f=90

kΩ and

R_1=10

kΩ. Calculate its gain.

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SA-PX-PI-0011 markL1 FoundationCalculatorAntimatter

The rest energy of an electron is

0.511

MeV. Calculate the minimum photon energy, in MeV, needed to produce an electron–positron pair.

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