Measurements

Question 1

List all the base quantities with their units and symbol

Answer 1

Length,l - Metre, m
Mass, m - Kilogram, kg
Temperature,T - Kelvin, K
Light intensity - Candela, cd
Amount of substance - Mole, mol
Current, I - Ampere, A

Question 2

List all the prefixes and their values

Answer 2

Tera - 10^12
Giga -10^9
Mega - 10^6
Hecto - 10^2
Deca - 10^1
Kilo - 10^3
BASE
deci - 10^-1
centi - 10^-2
mili - 10^-3
micro - 10^-6
nano - 10^-9
pico - 10^-12

Question 3

Definition of base quantity

Answer 3

Quantity that cannot be defined in terms of other quantity.

Question 4

Definition of derived quantity

Answer 4

quantity that are derived from combination of base quantities

Question 5

Absolute zero

Answer 5

0K, -273.15 C

Question 6

Ways to measure volume of irregular and regular object

Answer 6

Regular - measuring tape/ruler then calculate
Irregular(sinks - displacement can and measuring cylinder
Float - the above + electronic balance, string and weight to tie the object down

Question 7

Steps to use displacement can for object that floats

Answer 7

1. Tie the object that sinks with string and lower it in the eureka and measure the volume, Vo
2. Tie the object that floats with the one that sinks
3. lower both objects gently into the eureka can
4. Measure volume of both objects, Vi
5. Calculate object that floats by Vf - Vo

Question 8

Precautions for eureka can

Answer 8

1. make sure level of water in eureka can is filled to the brim
2. Gently lower the object to avoid spillage of water + increase accuracy

Question 9

Types of errors and examples

Answer 9

Random - human, parallax, reaction time, careless
Systemic - Zero(positive and negative), Callibration(device metrics)

Question 10

List down everything about period

Answer 10

Period, T(S) - Time taken for ONE complete oscillation
Formula: T= 1/f

Question 11

List down everything about frequency

Answer 11

Frequency, f (He) - Number of complete oscillation per unit of time
Formula: f = 1/T

Question 12

Scalar definition and examples

Answer 12

physical quantity that has MAGNITUDE ONLY
eg: speed, length, mass, density, temperature, current, time, amount of substance

Question 13

Vector definition and examples

Answer 13

physical quantity that has MAGNITUDE AND DIRECTION
eg: Velocity, acceleration, force, workdone, pressure, momentum