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 17 of 137 · choose a topic above to narrow them down

SA-9702-CA1-0041 markL1 FoundationCalculatorCapacitance

Capacitance is defined as

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SA-9702-CA2-0012 marksL1 FoundationCalculatorEnergy stored

100

μF capacitor is charged to

2000

V. Calculate the energy stored.

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SA-9702-CA2-0031 markL1 FoundationCalculatorEnergy stored

A capacitor holds

3.0

mC at a p.d. of

20

V. Calculate the energy stored, in mJ.

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SA-9702-CA2-0041 markL1 FoundationCalculatorArea under V–Q

The energy stored in a capacitor is represented by

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SA-9702-CA2-0051 markL1 FoundationCalculatorEnergy stored

The p.d. across a capacitor is tripled. State the factor by which the energy stored increases.

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SA-9702-CA3-0011 markL1 FoundationCalculatorTime constant

100

μF capacitor discharges through a

20

kΩ resistor. Calculate the time constant.

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SA-9702-CA3-0041 markL1 FoundationCalculatorTime constant

After one time constant, the charge on a discharging capacitor has fallen to about

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SA-9702-CA3-0051 markL1 FoundationCalculatorTime constant

Calculate the halving time for a capacitor discharging with

RC=5.0

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SA-9702-CM1-0011 markL1 FoundationCalculatorAngular speed

A wheel turns at

120

revolutions per minute. Calculate its angular speed.

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SA-9702-CM1-0021 markL1 FoundationCalculatorv = rω

A point is

0.30

m from the axle of the wheel above (

\omega=12.6

rad s⁻¹). Calculate its speed.

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SA-9702-CM1-0031 markL1 FoundationCalculatorAngular speed

Convert

90°

to radians.

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SA-9702-CM1-0041 markL1 FoundationCalculatorAngular speed

One radian is the angle subtended at the centre of a circle by an arc of length equal to

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SA-9702-CM2-0012 marksL1 FoundationCalculatorCentripetal force

1200

kg car travels round a flat bend of radius

50

m at

15

m s⁻¹. Calculate the centripetal force.

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SA-9702-CM2-0021 markL1 FoundationCalculatorCentripetal acceleration

An object moves in a circle of radius

2.0

m at

6.0

m s⁻¹. Calculate its centripetal acceleration.

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SA-9702-CM2-0031 markL1 FoundationCalculatorCentripetal acceleration

An object moves in a circle of radius

0.50

m with angular speed

4.0

rad s⁻¹. Calculate its centripetal acceleration.

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SA-9702-CM2-0041 markL1 FoundationCalculatorCentripetal force

For a satellite in a circular orbit around Earth, the centripetal force is provided by

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SA-9702-DC1-0012 marksL1 FoundationCalculatorInternal resistance

A cell of e.m.f.

1.5

V and internal resistance

0.50

Ω is connected to a

2.5

Ω resistor. Calculate the current.

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SA-9702-DC1-0021 markL1 FoundationCalculatorInternal resistance

For the cell in the previous question (

I=0.50

A through

2.5

Ω), calculate the terminal p.d.

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SA-9702-DC1-0041 markL1 FoundationCalculatorV–I graph of a cell

On a graph of terminal p.d.

V

against current

I

for a cell, the gradient equals

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SA-9702-DC2-0011 markL1 FoundationCalculatorCombining resistors

Calculate the combined resistance of

6.0

Ω and

3.0

Ω in parallel.

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