UPSC General Science MCQs – 08

Which one of the following elements is essential for the construction of nuclear reactors? [UPSC Civil Services, 1998]

Salts of which of the following elements provide colours to fireworks? [UPSC Civil Services, 2004]

Acid rain is caused by the pollution of environment by [UPSC Civil Services, 2013]

With reference to the usefulness of the by-products of sugar industry, which of the following statements is / are correct? [UPSC Civil Services, 2013]
1. Bagasse can be used as biomass fuel for the generation of energy.
2. Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers.
3. Molasses can be used for the production of ethanol.
Select the correct answer using the codes given below.

The clouds float in the atmosphere because of their low:

Which one of the following is the correct sequence of the given substances in the decreasing order of their densities? [UPSC Civil Services, 2005]

Hepatitis B virus (HBV) contains

DNA is negatively charged due to the presence of

The digestion of carbohydrates first takes place in

In addition to fingerprint scanning, which of the following can be used in the biometric identification of a person? [UPSC Civil Services, 2014]
1. Iris scanning
2. Retinal scanning
3. Voice recognition
Select the correct answer using the code given below.