NDA Government Jobs Exams

The most important raw material used in the manufacture of cement are
(A) Potassium nitrate, charcoal and sulphur
(B) Limestone, clay and gypsum
(C) Transition metal oxides, sodium hydroxide or potassium hydroxide
(D) Limestone, sodium carbonate and silica

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NDA Other Question

Consider the following statements :
1. Diamond is hard and graphite is soft.
2. diamond is soft and graphite is hard.
3. Diamond is a bad conductor but graphite is a good conductor.
4. Diamond is a good conductor but graphite is a bad conductor.
Which of the statements given above is/are correct ?
(A) 1 and 3 (B) 1 only
(C) 2 and 3 (D) 1 and 4 Which one among the following equations is correctly balanced ?
(A) NaOH + Al + H2O → 2H2 + NaAlO2
(B) 2NaOH + 2Al + 2H2O → 3H2 + 2NaAlO2
(C) 2NaOH + 2Al + 3H2O → 4H2 + 2NaAlO2
(D) 2NaOH + 2Al + H2O → H2 + 2NaAlO2