Physics — A-Level — SyllabAI Hub

11 markeasy

Which of the following is an SI base unit?

Choose your answer

Current

Gram

Kelvin

Volt

21 markeasy

Four values of energy are listed below.

5kJ
5mJ
5MJ
5nJ

Starting with the smallest first, what is the order of increasing magnitude of these energies?

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$5\mathrm{kJ}\rightarrow5\mathrm{mJ}\rightarrow5\mathrm{MJ}\rightarrow5\mathrm{nJ}$

$5\mathrm{nJ}\rightarrow5\mathrm{kJ}\rightarrow5\mathrm{MJ}\rightarrow5\mathrm{mJ}$

$5\mathrm{nJ}\rightarrow5\mathrm{mJ}\rightarrow5\mathrm{kJ}\rightarrow5\mathrm{MJ}$

$5\mathrm{mJ}\rightarrow5\mathrm{nJ}\rightarrow5\mathrm{kJ}\rightarrow5\mathrm{MJ}$

31 markeasy

Which product-pair of metric prefixes has the greatest magnitude?

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pico × mega

nano × kilo

micro × giga

milli × tera

41 markeasy

Which statement includes a correct unit?

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Energy = 7.8 N s

Force = 3.8 N s

Momentum = 6.2 N s

Torque = 4.7 N s

51 markeasy

Which quantity can be measured in electronvolts (eV)?

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Electric charge

Electric potential

Energy

Power

61 markeasy

Which of the following is not a SI base unit?

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kilogram

metre

second

volt

71 markeasy

Which product pair of metric prefixes has the smallest magnitude?

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nano × mega

tera × pico

centi × kilo

micro × giga

81 markeasy

Which unit is not an SI base unit?

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A

K

mol

N

91 markmedium

The average kinetic energy E of a gas molecule is given by the equation

$E=\frac{3}{2}kT$

where T is the thermodynamic (kelvin) temperature.

What are the SI base units of k?

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$\mathrm{kg}^{-1}m^{-1}s^{2}K$

$\mathrm{kg}^{-1}m^{-2}s^{2}K$

$\mathrm{kg}ms^{-2}K^{-1}$

$\mathrm{kg}m^{2}s^{-2}K^{-1}$

101 markmedium

The units of all physical quantities can be expressed in terms of SI base units.

Which pair contains quantities with the same base units?

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Force and momentum

Pressure and Young modulus

Power and kinetic energy

Mass and weight

111 markmedium

The table contains some quantities, together with their symbols and units.

Quantity	Symbol	Unit
Gravitational field strength	g	N kg^–¹
Density of liquid	ρ	kg m^–³
Vertical height	h	m
Volume of part of liquid	V	m³

Which expression has the units of energy?

Choose your answer

$ρg^{2}h$

$\frac{ρhV}{g}$

$\frac{ρg}{hV}$

$gρhV$

121 markmedium

What is the ratio $\frac{10^{-3}\mathrm{THz}}{10^{3}\mathrm{kHz}}$ ?

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10^-9

10^-6

10⁰

10³

131 markmedium

Which of the following correctly expresses the volt in terms of SI base units?

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AΩ* *

WA^–1

$\mathrm{kg}m^{2}s^{--1}A^{--1}$

$\mathrm{kg}m^{2}s^{--3}A^{--1}$

141 markmedium

The equation relating pressure and density is $P=ρgh$

How can both sides of this equation be written in terms of base units?

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$[ \mathrm{N} \mathrm{m}^{- 1} ] = [ \text{kg} \mathrm{m}^{- 3} ] [ \mathrm{m} \mathrm{s}^{- 1} ] [ \mathrm{m} ]$

$[ \mathrm{N} \mathrm{m}^{- 2} ] = [ \text{kg} \mathrm{m}^{- 2} ] [ \mathrm{m} \mathrm{s}^{- 2} ] [ \mathrm{m} ]$

$[ \text{kg} \mathrm{m}^{- 1 } \mathrm{s}^{- 2} ] = [ \text{kg} \mathrm{m}^{- 3} ] [ \mathrm{m} \mathrm{s}^{- 2} ] [ \mathrm{m} ]$

$[ \text{kg} \mathrm{m}^{- 1} \mathrm{s}^{- 1} ] = [ \text{kg} \mathrm{m}^{- 1} ] [ \mathrm{m} \mathrm{s}^{- 2} ] [ \mathrm{m} ]$

151 markmedium

What is the ratio $\frac{10^{2}\text{THz}}{10^{-4}\text{pHz}}$ ?

Choose your answer

10^-30

10^-2

10²

10³⁰

161 markhard

The speed v of a liquid leaving a tube depends on the change in pressure ΔP and the density ρ of the liquid. The speed is given by the equation

$v = k ( \frac{\Delta P}{\\rho } )^{n}$

where k is a constant that has no units.

What is the value of n?

Choose your answer

$\frac{1}{2}$

1

$\frac{3}{2}$

2

171 markhard

The frictional force F on a sphere falling through a fluid is given by the formula

$F=6πrηv$

where r is the radius of the sphere, η is a constant relating to the fluid and v is the velocity of the sphere.

What are the units of *η *?

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$\mathrm{kg}ms^{-1}$

$\mathrm{kg}m^{-1}s^{-1}$

$\mathrm{kg}ms^{-3}$

$\mathrm{kg}m^{3}s^{-3}$

181 markhard

When a constant braking force is applied to a vehicle moving at speed v, the distance d moved by the vehicle as it comes to rest is given by the expression

$d=kv^{2}$

where* k* is a constant.

When d is measured in metres and v is measured in metres per second, the constant has a value of k₁.

What is the value of the constant k when the distance is measured in metres, and the speed is measured in kilometres per hour?

Choose your answer

$0.077k_{1}$

$0.278k_{1}$

$3.60k_{1}$

$13.0k_{1}$

191 markhard

The drag coefficient C_d is a number with no units. It is used to compare the drag on different cars at different speeds. It is given by the equation

$C_{d}=\frac{2F}{ρv^{n}A}$

where F is the drag force on the car, ρ is the density of the air, A is the cross-sectional area of the car and v is the speed of the car.

What is the value of n?

Choose your answer

1

2

3

4

201 markhard

Which formula could be correct for the speed v of ocean waves in terms of the density ρ of sea-water, the acceleration of free fall g, the height h of the wave and the wavelength λ?

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$v=\sqrt{ρgh}$

$v=\sqrt{\frac{g}{h}}$

$v=\sqrt{gλ}$

$v=\sqrt{\frac{g}{ρ}}$

211 markhard

The equation for the terminal velocity of a sphere of radius r falling under acceleration due to gravity, g, through a liquid with density ⍴ and viscosity ɳ, measured in kg m⁻¹ s⁻¹ is:

$v_{t}=\frac{2}{9}\frac{gr^{n}ρ}{η}$

What is the value of n?

Choose your answer

0.5

1

2

3

221 markhard

The current $I$ through a semiconductor diode is given by:

$I=I_{0}e^{\frac{-qV}{nT}}$

where $I_{0}$ is the initial current, $q$ is the charge of an electron, $V$ is the applied potential difference, $T$ is the temperature, and $n$ is a constant.

What is the unit of $n$ * *when expressed in SI base units?

Choose your answer

kg m² s⁻² K⁻¹

kg m² s⁻⁴ K⁻¹

kg⁻¹ m⁻² s² K

kg⁻¹ m⁻² s⁴ K

SI Units — Multiple-Choice Questions (Cambridge International A-Level Physics): Exam Questions

SI Units — Multiple-Choice Questions (Cambridge International A-Level Physics): Exam Questions