Physical Quantities

Question 1

what are the basic quantities?

Answer 1

-length
-current
-mass
-time
-temperature
LCMTT

Question 2

what is the si unit of length?

Answer 2

metre (m)

Question 3

what is the si unit of current?

Answer 3

ampere (A)

Question 4

what is the si unit of mass?

Answer 4

kilogram (kg)

Question 5

what is the si unit of time?

Answer 5

seconds (s)

Question 6

what is the si unit of temperature?

Answer 6

kelvin (k)

Question 7

what are some examples of derived quantities?

Answer 7

• density
• volume
• speed
• force
• pressure
• electrical energy

Question 8

what is the symbol and factor of the prefix mili?

Answer 8

symbol - m

factor - x10-3

Question 9

what is the symbol and factor of the prefix micro?

Answer 9

symbol - upside down h

factor - x10-6

Question 10

what is the symbol and factor of the prefix nano?

Answer 10

symbol - n

factor - x10-9

Question 11

what is the symbol and factor of the prefix pico?

Answer 11

symbol - p

factor - x10-12

Question 12

what is the symbol and factor of the prefix kilo?

Answer 12

symbol - k

factor - x10 3

Question 13

what is the symbol and factor of the prefix mega?

Answer 13

symbol - M

factor - x10 6

Question 14

what is the symbol and factor of the prefix giga?

Answer 14

symbol - G

factor - x10 9

Question 15

what is the symbol and factor of the prefix tera?

Answer 15

symbol - T

factor - x10 12

Question 16

what can vernier caliper be used for?

Answer 16

to measure external and internal diameter as well as depth

Question 17

what is the micrometer screw gauge used for?

Answer 17

to measure the thickness of a coin or diameter of wire

Question 18

what is a period?

Answer 18

it is the time taken for one complete oscillation

Question 19

what is the si unit for period?

Answer 19

seconds (s)

Question 20

how does the length of the string affect the period?

Answer 20

the longer the string, the longer the period

the shorter the string, the shorter the period

Question 21

does the mass of the bob affect the period?

Answer 21

no, the mass of the bob does not affect the period

Question 22

what are some precautions for the pendulum experiment?

Answer 22

• start timing when oscillations are stable
• use small angle of displacement
• repeat the experiment at least once and use the average time to calculate period of oscillation
• use the retort stand as an aid of fudicial line to ensure stopwatch is start and stop accurately at the right position

Question 23

define scalar quantities

Answer 23

a scalar quantity has only magnitude but no direction

Question 24

define vector quantities

Answer 24

a vector quantity has both magnitude and direction

Question 25

what is the approximate size of an atom?

Answer 25

1x10 -10m

Question 26

what is the approximate size of the earth?

Answer 26

6371km in radius, about 1x10 7m in size