NDA Government Jobs Exams

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

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NDA Other Question
Which one among the following does not have an allotrope ?
(A) oxygen (B) Sulphur
(C) Nitrogen (D) Carbon 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