7000+ Mechanical Engineering MCQ for Competitive Exams 2024 - 2025 - 2

Question: 6

For controlling the growth of algae, the chemical generally used is

(A) copper sulphate

(B) bleaching powder

(C) lime

(D) alum

Question: 7

The rate at which atoms of radioactive sources disintegrate is measured in terms of

(A) frequency

(B) wavelength

(C) curie

(D) atomic number

Question: 8

Low grade fuels have

(A) low carbon content

(B) low calorific value

(C) low ash content

(D) low moisture content

Question: 9

The speed of sound will be maximum through

(A) aluminium

(B) alcohol

(C) concrete

(D) water

Question: 10

Which of the following is the major source of fly ash emission?

(A) power plants

(B) blast furnace

(C) oil refineries

(D) sintering plants