General Knowledge Questions

If waste materials contaminate the source of drinking water, which of the following diseases will spread?

Which method will be employed to test the hardness of water?

Which one among the following is not an electro­magnetic wave?

Manganite is an ore/mineral of

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.

This town has an ancient temple(A)/and beautiful waterfall(B)/so many tourists come here.(C)/No error(D)

The elements known as primary nutrients for plants

In the following question, a sentence has been given in Active/Passive voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive/Active voice. 
Sarla changed the curtains.

In the following questions, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.
An independent, able and upright judiciary is the hallmark of a free _____ country therefore, the process of judicial appointment is of _____ importance. At present on account of the Supreme Court’s last advisory opinion, the _____ of the executive and its interference in the appointment of judges is _____ which in light of previous is most _____.
At present on account of the Supreme Court's last advisory opinion, the _____ of the executive