Practise

Question bank

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

TopicSkillDifficulty

2730 questions · page 16 of 137 · choose a topic above to narrow them down

SA-5054-WV5-0032 marksL1 FoundationCalculatorEchoes & ultrasound

Sound travels

680

m in

2.0

s. Calculate the speed of sound.

Salam Academy Original Practice · Proposed mark scheme

SA-5054-WV5-0041 markL1 FoundationCalculatorSound waves

Sound waves in air are

Salam Academy Original Practice · Proposed mark scheme

SA-5054-WV5-0051 markL1 FoundationCalculatorSound waves

A ringing bell is placed in a jar and the air is pumped out. The sound

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AC1-0011 markL1 FoundationCalculatorr.m.s. and power

Calculate the peak value of a

230

V r.m.s. supply.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AC1-0031 markL1 FoundationCalculatora.c. terms

Calculate the period of a

50

Hz supply, in ms.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AC1-0041 markL1 FoundationCalculatorr.m.s. and power

The r.m.s. value of an alternating current is

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AC2-0011 markL1 FoundationCalculatorRectification

Half-wave rectification can be achieved using

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AC2-0031 markL1 FoundationCalculatorRectification

50

Hz supply is full-wave rectified. State the frequency of the peaks in the output.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AC2-0041 markL1 FoundationCalculatorSmoothing

The smoothing capacitor in a rectifier circuit is connected

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS1-0031 markL1 FoundationCalculatorRadiant flux

The luminosity of a star is

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS1-0041 markL1 FoundationCalculatorStandard candles

A standard candle is

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS1-0051 markL1 FoundationCalculatorRadiant flux

A star is moved to three times its distance. State the factor by which its radiant flux at Earth changes, as a decimal.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS2-0011 markL1 FoundationCalculatorWien's law

A star's spectrum peaks at

420

nm. Using

\lambda_{\max}T=2.9\times10^{-3}

m K, estimate its surface temperature.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS2-0031 markL1 FoundationCalculatorWien's law

Wien's displacement law states that the peak wavelength of a black body is

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS2-0041 markL1 FoundationCalculatorStefan–Boltzmann

Two stars have the same radius. One has twice the surface temperature. State the ratio of their luminosities (hotter : cooler).

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS2-0051 markL1 FoundationCalculatorStefan–Boltzmann

Two stars have the same surface temperature. One has three times the radius. State the ratio of their luminosities (larger : smaller).

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS3-0041 markL1 FoundationCalculatorRedshift

Redshift of light from a galaxy shows that the galaxy is

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS3-0051 markL1 FoundationCalculatorHubble's law

Hubble's law states that the recession speed of a galaxy is

Salam Academy Original Practice · Proposed mark scheme

SA-9702-CA1-0011 markL1 FoundationCalculatorCapacitance

470

μF capacitor is charged to

12

V. Calculate the charge stored, in mC.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-CA1-0031 markL1 FoundationCalculatorCombining capacitors

Calculate the combined capacitance of

10

μF and

15

μF in series.

Salam Academy Original Practice · Proposed mark scheme