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प्रश्न
Select the correct name from the choices given below for the following case.
A chemical used as a preservative for jams, pickles, etc.
विकल्प
Titanium dioxide
Rayon
Benzoic acid
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उत्तर
Benzoic acid
संबंधित प्रश्न
___________ deals with the study of matter and the changes it undergoes.
Match the following scientists in column A with their discoveries or contributions in column B.
| Column A | Column B | ||
| (a) | Marie Curie | (i) | Safety Lamp |
| (b) | John dalton | (ii) | Helium |
| (c) | William Ramsey | (iii) | Nobel Prize Winner (two times) |
| (d) | Sir Humphry Davy | (iv) | Atomic Theory |
State what is Science and give the basic bifurcation of Science with reasons.
State the functions of the following basic glass apparatus:
Round bottom flask
State the function of
The air regulator in a Bunsen burner.
State what are – ‘stain removals’. Name three important stain removers & give their prime functions.
Select the correct name from the choices given below for the following case.
A substance which absorbs moisture and keeps the skin dry and free from rashes.
Select the correct name from the choices given below for the following case.
A substance which dissolves grease & oil and is preferred as a – drain cleaner.
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
For holding washed test tubes
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A long glass apparatus closed at one end used for collecting gases.
