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1296. Which is/are the important raw materials required in cement industry ?
A. Limestone
B. Gypsum and clay
C. Clay
D. Limestone and clay
Explanation:
1297. Give the chronological order of the birth of the following scientists. 1. John Dalton2. Linus Pauling3. Dmitri Mendeleev4. Ptolemy
A. 1, 3, 2, 4
B. 1, 4, 3, 2
C. 2, 3, 1, 4
D. 2, 4, 3, 1
Explanation:
1298. The main constituents of pearls are :
A. calcium carbonate and magnesium carbonate
B. calcium oxide and ammonium chloride
C. aragonite and sodium carbonate
D. ammonium sulphate and sodium carbonate
Explanation:
1299. The organs different but perform the same function are called :
A. homologous organs
B. analogous organs
C. vestigial organs
D. none of these
Explanation:
1300. The filament of an electric bulb is made of :
A. iron
B. nichrome
C. tungsten
D. graphite
Explanation:
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