mock exam

Question 1

derived quantities are produced from a combination of SI base units and always contain one of the following 3 base units

Answer 1

m ,kg, s

Question 2

how many base units are there

Answer 2

7

Question 3

whats the SI unit for temperature

Answer 3

Kelvin

Question 4

whats the multiplying factor thats equal to 1000

Answer 4

10 to the power of 3

Question 5

what is equal to 1mSv

Answer 5

10 to the power of - 3 Sv

Question 6

whats the scientific notation multiplier to express a millionth

Answer 6

micro

Question 7

what is transposed correctly for the equation A = B /C

Answer 7

B = C x A

Question 8

what manipulation would you carry out first to solve an equation (BIDMAS)

Answer 8

brackets

Question 9

if you were asked to raise 2 by the exponent x to give an answer of 256 what would the value of x be

Answer 9

8

Question 10

true or false. a proton is always equal to the neutrons

Answer 10

false

Question 11

if an atom has 8 protons and 8 neutrons its atomic number will be … and the atomic mass will be …

Answer 11

number = 8
mass = 16

Question 12

what is the name of the band of electron orbitals that electrons can jump into from the valence band via excitation

Answer 12

conduction band

Question 13

what is a form of ionising radiation

Answer 13

gamma decay

Question 14

what type of ionising radiation is x rays

Answer 14

electromagnetic

Question 15

what does not emit mostly electromagnetic radiation

Answer 15

ultrasound

Question 16

what element is the rotating anode disc made

Answer 16

tungsten

Question 17

what are the required characteristic of the filament in an x ray machine

Answer 17

low thermionic work function
low vapour pressure
a strong metal

Question 18

is a melting point of less than 1000 degree celsius a required characteristic for the filament in an x ray machine

Answer 18

no

Question 19

a continuous x ray spectrum is produced by what

Answer 19

an electron interacting with the nucleus of an atom in a target material

Question 20

attenuation is defined as

Answer 20

the reduction in the energy per unit of the x ray beam

Question 21

does collimation lead to attenuation of the x ray beam

Answer 21

no

Question 22

what is half value thickness

Answer 22

thickness of a substance that will transmit 50 percent of the x ray photons to which it is exposed

Question 23

what does 0.25mm lead equivalent mean

Answer 23

a material attenuated the x ray beam as much as 0.25mm of lead

Question 24

what does mAs indicate

Answer 24

tube charge

Question 25

what does kV represent

Answer 25

thousands of volts