Physical Quantities, Units and Measurements

Question 1

what is a physical quantity?

Answer 1

it is a quantity that can be measured.

Question 2

what does a physical quantity have?

Answer 2

it has a numerical magnitude and a unit.

Question 3

what is the si unit for length?

Answer 3

metre (m)

Question 4

what is the si unit for time?

Answer 4

second (s)

Question 5

what is the si unit for mass?

Answer 5

kilogram (kg)

Question 6

what is the si unit for temperature?

Answer 6

kelvin (K)

Question 7

what is the operation we must use to convert a quantity from ‘prefix’ to ‘no prefix’?

Answer 7

multiply

Question 8

what is the operation we must use to convert a quantity from ‘no prefix’ to ‘prefix’?

Answer 8

divide

Question 9

what is the symbol and factor for giga?

Answer 9

10 to the power of 9; G

Question 10

what is the symbol and factor of mega?

Answer 10

10 to the power of 6; M

Question 11

what is the symbol and factor of kilo?

Answer 11

10 to the power of 3; k

Question 12

what is the symbol and factor of deci?

Answer 12

10 to the power of -1; d

Question 13

what is the symbol and factor of centi?

Answer 13

10 to the power of -2; c

Question 14

what is the symbol and factor of mili?

Answer 14

10 to the power of -3; m

Question 15

what is the symbol and factor of micro?

Answer 15

10 to the power of -6; (refer to symbol)

Question 16

what is the factor and symbol of nano?

Answer 16

10 to the power of -9; n

Question 17

what is the magnitude of planet earth (diameter)?

Answer 17

10 to the power of 7 m

Question 18

what is the magnitude of moon (diameter)?

Answer 18

10 to the power of 6 m

Question 19

what is the magnitude of height of tall mountain?

Answer 19

10 to the power of 3 m

Question 20

what is the magnitude of length of football field?

Answer 20

10 to the power of 2 m

Question 21

what is the magnitude of height of chair?

Answer 21

10 to the power of -1 m

Question 22

what is the magnitude of width of paper?

Answer 22

10 to the power of -4 m

Question 23

what is the magnitude of size of human cell?

Answer 23

10 to the power of -6 m

Question 24

what is the magnitude of size of large molecule?

Answer 24

10 to the power of -9 m

Question 25

what is the range and precision of a tape measure?

Answer 25

several cm up to a few m; 0.1cm or 1mm

Question 26

what is the range and precision of metre rule?

Answer 26

several cm up to a metre; 0.1cm or 1mm

Question 26

what is the range and precision of calipers?

Answer 26

several cm up to typically 10 cm (depending on caliper size); 1mm

Question 27

what is the range and precision of vernier calipers?

Answer 27

typically 1cm to 15cm (some up to 30cm); 0.01cm or 0.1mm

Question 28

what is the range and precision of micrometer screw gauge?

Answer 28

typically less than 2.5cm; 0.001 cm or 0.01mm

Question 29

what is a pendulum used for?

Answer 29

it can be used to measure time after it is calibrated

Question 30

what is a period?

Answer 30

time taken for one complete oscillation

Question 31

what is a period dependant on?

Answer 31

the length of the pendulum

Question 32

what is the relationship between the length of the pendulum and its period?

Answer 32

the longer the length is, the longer the period