Working as a Physicist

Question 1

SI Base Unit of Length?

Answer 1

Metre (m)

Question 2

SI Base Unit of Mass?

Answer 2

Kilogram (kg)

Question 3

SI Base Unit of Time?

Answer 3

Second (s)

Question 4

SI Base Unit of Current?

Answer 4

Ampere (A)

Question 5

SI Base Unit of Temperature?

Answer 5

Kelvin (K)

Question 6

SI Base Unit for an amount of a substance?

Answer 6

Mole (mol)

Question 7

What are the Prefixes?

Answer 7

Tera (T) = 10^12
Giga (G) =10^9
Mega (M) =10^6
Kilo (k) = 10 ^3
milli (m) =10^-3
micro (u) = 10^-6
nano (n) = 10^-9
pico (p) = 10^-12

Question 8

What are the SI Base Units?

Answer 8

Length, Mass, Time, Current, Temperature and Amount of a substance

Question 9

How do you convert between prefixes?

Answer 9

Convert upwards on each by dividing by 1000 and downwards on each by multiplying by 1000.

Question 10

What are the derived units?

Answer 10

Speed, acceleration, force, energy, power, pressure, charge, potential difference and resistance.

Question 11

Derived Units of Speed / Velocity

Answer 11

ms^-1

Question 12

Derived Units of Acceleration

Answer 12

ms^-2

Question 13

Derived Units of Force (Newtons)

Answer 13

kgms^-2

Question 14

Derived Units of Energy (Joules)

Answer 14

kgm^2s^-2

Question 15

Derived Units of Power (Watts)

Answer 15

kgm^2s^-3

Question 16

Derived Units of Pressure (Pascals)

Answer 16

kgm^-1s^-2

Question 17

Derived Units of Charge (Coulombs)

Answer 17

As

Question 18

Derived Units of Potential Difference (Volts)

Answer 18

A^-1kg^2s^-3

Question 19

Accurate Definition

Answer 19

How close the measured value is is to the true value

Question 19

Derived Units of Resistance (Ohms)

Answer 19

A^-2kg^2s^-3

Question 20

Precise Definition

Answer 20

Repeats are close together

Question 20

Random Error Definition

Answer 20

A different error every time

Question 21

Systematic Error

Answer 21

A error that is the same every time

Question 22

Resolution

Answer 22

Smallest interval measure

Question 23

Zero Error

Answer 23

Measurements don’t begin at the true error

Question 24

Uncertainty Equation

Answer 24

Percentage Uncertainty = (Uncertainty / Measured Value) x 100

Question 25

What is the uncertainty when quantities are added or subtracted?

Answer 25

The uncertainty is the sum of the absolute uncertainties.

Question 26

What is the uncertainty when quantities are multiplied or divided?

Answer 26

The total percentage uncertainty is the sum of percentage uncertainties.

Question 27

What equation is used to draw a straight line graph?

Answer 27

y = mx +c

Question 28

What axis is the independent variable?

Answer 28

x - axis

Question 29

What axis is the dependent variable?

Answer 29

y - axis

Question 30

What happens if the equation has a +c value?

Answer 30

The graph does not begin at zero.

Question 31

Independent Variable Definition

Answer 31

A variable that isn’t changed by other variables you are trying to measure and you change it throughout the experiment.

Question 32

Dependent Variable Definition

Answer 32

A change that happens because of the independent variable.

Question 33

Control Variable Definition

Answer 33

A property that remains constant and unchanged throughout the experiment.