lesson 1 scientific learning

Question 1

Define variable

Answer 1

The causative factor, character, or traits that have direct or indirect effects on the occurrence of an event or phenomenon is called variable.

Question 2

Types of variables

Answer 2

• Dependent variable
• Independent variable
• Controlled variable

Question 3

Define Dependent variable

Answer 3

Those variables which value depends on other variables and experimenter cannot predict it is called Dependent variable.

Question 4

Define Independent Variable

Answer 4

Those variables whose value can be changed directly by the experimenter is called independent variable

Question 5

Define controlled variables

Answer 5

Those variables which should be controlled in an experiment to get an accurate result in a change in specified variables are called controlled variables.

Question 6

How many independent variable should be there is an experiment?

Answer 6

They should be only one independent variable in an experiment, to reduce the factors that change the result of the experiment (dependent variable) so we can get accurate results.

Question 7

How many dependent variable should be there is an experiment?

Answer 7

There should be only one dependent variable.

Question 8

What are the things to be considered in an experiment

Answer 8

• Other than specified dependent and independent variables other should be controlled

Question 9

In which hand sides are the variables written? with example

Answer 9

• Dependent variables are written in left hand side whereas independent variables are written in right hand side.

eg : s= vt

Question 10

While plotting in graph where are the dependent and independent variables are plotted?

Answer 10

Dependent variables are plotted in y-axis whereas independent variables are plotted in x-axis.

Question 11

On the basis of where the variables are written or plotted, what are they known as ?

Answer 11

Dependent variable - left variable, vertical variable

independent variable - right variable, horizontal variable.

Question 12

Why is dependent and independent variables plotted in graph?

Answer 12

Dependent and independent variables are plotted in graph in order to see how the change in independent variables brings change in dependent variables.

Question 13

Define fundamental unit

Answer 13

Those units which do not depend on other units and cannot be expressed further into more simpler form are called fundamental units.

Question 14

How many independent units are there and what are they?

Answer 14

There are 7 fundamental units and they are:
1. length - metre
2. mass - kilogram
3. time - seconds
4. temperature - kelvin
5. electric current - Ampere
6. Luminous intensity - candela
7. Amount of sustance - mole

Question 15

What are derived units?

Answer 15

The unit of measurement which depend on fundamental units are called derived units.