How will you decide whether the dog is alive or not ?

What is the criteria to decide a best fuel ?

What chemical do we use to test the presence of starch ?

What is the criteria to decide number of electrons in a shell?

What sort of food do we eat ?

What were the criteria used by Mendeleev in creating his Periodic Table ?

What variations do we see in forest types?

In our day today work we use a wooden plastic scale to measure length it is marked in cm and mm to measure the length of a table we use metre scale what instrument do we use to measure the length of a book?

How do you decide the strength of acid or base ?

How can we decide whether an object is moving faster or slower ?