Measurement

Question 1

Define physical quantity

Answer 1

A quantity that can be measured and consists of a numerical magnitude and unit

Question 2

Similarities between vector and scalar quantity

Answer 2

Both quantities have a magnitude

Question 3

Difference between vector and scalar quantities

Answer 3

Vector has a direction whereas scalar does not

Question 4

Examples of scalar quantities (five)

Answer 4

Distance, speed, mass, energy, time

Question 5

Examples of vector quantities (four)

Answer 5

Displacement, velocity, acceleration, force

Question 6

SI unit of length

Answer 6

m

Question 7

SI unit of Mass

Answer 7

Kg

Question 8

SI unit of weight

Answer 8

N

Question 9

SI unit of time

Answer 9

s

Question 10

SI unit of electric current

Answer 10

A

Question 11

SI unit of thermodynamic temperature

Answer 11

K

Question 12

Prefixes for SI units

Answer 12

Giga (G)- 10^9
Mega (M)- 10^6
Kilo (K)- 10^3
Deci (d)- 10^-1
Centi (c)- 10^-2
Milli (m)- 10^-3
Micro (µ)- 10^-6
Nano (n)- 10^-9

Question 13

Mnemonic for SI unit

Answer 13

Great man Kavan drinks cold milk until night

Question 14

Radius of hydrogen nucleus

Answer 14

10^-15m

Question 15

Size of a typical atom

Answer 15

10^-10m

Question 16

Average width of a human hair

Answer 16

10^-4m

Question 17

Diameter of wire

Answer 17

10^-3m

Question 18

Length of chopstick

Answer 18

10^-1m

Question 19

Length of football field

Answer 19

10^2m

Question 20

Height of mount Everest

Answer 20

10^4m

Question 21

Radius of earth

Answer 21

10^6

Question 22

Distance of 1 light year

Answer 22

10^16m

Question 23

Distance from earth to the Andromeda galaxy

Answer 23

10^22m

Question 24

Precision of Vernier caliper

Answer 24

0.01cm

Question 25

Precision of micrometer screw gauge

Answer 25

0.01mm