Chapter 1: Measurement

Question 1

7 base quantities

Answer 1

Length (m)
Mass (kg) 
Time (s) 
Electric Current (A) 
Thermodynamic temperature (K) 
Luminous intensity (cd) 
Amount of substance (mol)

Question 2

Prefixes for Si units

Answer 2

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 3

oscillation

Answer 3

each complete to-and-fro motion is one oscillation

Question 4

period

Answer 4

the period of a simple pendulum is the time taken for one complete oscillation

Question 5

instruments used to measure time

Answer 5

• clocks
• pendulums
• stopwatches

(based on periodic motions called oscillations)