EASY
UPSC CDS
IMPORTANT
Earn 100
When we heat lead nitrate [Pb(NO)] in a boiling tube, we observe the emission of brown fumes. Which one of the following is the brown gas?
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Important Questions on UPSC CDS (I) Previous Year Paper 2021
EASY
UPSC CDS
IMPORTANT
Which one of the following substances do silver articles react with, that makes the silver articles black?
MEDIUM
UPSC CDS
IMPORTANT
Which one of the following metals is kept immersed in Kerosene oil to protect it and to prevent accidental fire?
MEDIUM
UPSC CDS
IMPORTANT
A solution contains g of solute in g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage?
MEDIUM
UPSC CDS
IMPORTANT
Which one of the following elements is a non-metal but is lustrous ?
MEDIUM
UPSC CDS
IMPORTANT
Which one of the following metals has both malleability and ductility properties ?
MEDIUM
UPSC CDS
IMPORTANT
We are given three copper wires of different lengths and different areas of cross-section. Which one of the following would have the highest resistivity ?
EASY
UPSC CDS
IMPORTANT
Which of the following statements about 'fission' is correct ?
A. It is related with the creation of new individuals by means of cell division in unicellular organism.
B. It is related with the transformation of heavier nuclei into smaller nuclei.
C. It is related with the creation of a heavier nucleus by means of combining two higher nuclei.
MEDIUM
UPSC CDS
IMPORTANT
Which one of the following is an electric conductor ?
