science ch.1.5

Question 1

ways to make measurements .

the older ways were usually less _______ than modern ways

Answer 1

accurate

Question 2

example of an old way to measure stuff

Answer 2

people used arms to measure length and used a sundial to measure time

Question 3

the four units of measuring length (long form)

Answer 3

1.kilometers 2. meters 3. centimeters 4. millimeters

Question 4

30mm to km

Answer 4

0.000003 km

Question 5

what’s the ruler called that is to measure meter long items

Answer 5

meter rule

Question 6

How should we read the scale the. we measure things?

Answer 6

we should read it vertically above

Question 7

Four units of measuring liquids. (long form)

Answer 7

!. Litres 2. millilitres 3.cubic meters 4.cubic centimetres

Question 8

2m3 to cm3

Answer 8

2000000cm3

Question 9

What is the curved surface of a liquid in a measuring cylinder called?

Answer 9

meniscus

Question 10

tools that we use to measure the volume of an irregular object 2 ex

Answer 10

measuring cylinder and displacement can

Question 11

3 units of measuring mass

Answer 11

1.kilogram 2. grams 3. miligrams

Question 12

what tool do we use to measure mass?

Answer 12

we use a balance

Question 13

3 examples of type of balances

Answer 13

spring balance ,top pan balance ,lever balance ,electronic balance, bathroom balance

Question 14

why do we use an electronic balance?

Answer 14

It gives the most precise measurement ( 1 decimal place)

Question 15

739 g to kg

Answer 15

0.739 kg

Question 16

3.1 g to mg

Answer 16

3100 mg

Question 17

Temperature is usually measured in ?

Answer 17

degree Celsius

Question 18

what tool do we use to measure temperature?

Answer 18

thermometer

Question 19

Two types of thermometers

Answer 19

coloured alcohol thermometer and mercury thermometer

Question 20

which type of thermometer is is the most hygienic ? and why?

Answer 20

infrared forehead thermometer bc contact free

Question 21

the temperature range for coloured alcohol thermometer

Answer 21

-10-110

Question 22

the temperature range for mercury thermometer

Answer 22

0-360

Question 23

what’s the difference of mercury and alcohol thermometer?

Answer 23

The liquid inside the mercury thermometer is silvery while the coloured alcohol thermometer is red.

Question 24

Besides using a thermometer to measure the temperature what other tools can we use?

Answer 24

temperature sensor connected to a data-logger

Question 25

3 units for measuring time

Answer 25

hours , minutes , seconds

Question 26

what tools do we use to measure time? 3 example

Answer 26

watch , clock and stopwatch

Question 27

How accurately can a stopwatch measure time ? up to ?

Answer 27

one hundredth of a second

Question 28

why do we make errors when we make measurements? use time as an example

Answer 28

bc when we measure time the time measured may be slightly different each Time.

Question 29

How can we reduce errors?

Answer 29

we repeat the measurement several times then calculate an average value .the average value obtained is more reliable.