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836. Which of the following alloys is used for making magnets ?
A. Duralumin
B. Stainless steel
C. alnico
D. Magnalium
Explanation:
837. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ? 1. Assertion (A) : A diamond sparkles more than a glass imitation cut to the same shape. 2. Reason (R) : The refractive index of diamond is less than that of glass.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
838. What fraction of a floating iceberg remains inside water ?
A. 0.5
B. 0.7
C. 0.8
D. 0.9
Explanation:
839. The stars twinkle in the night because
A. they emit light intermittently.
B. the stars atmosphere absorbs light intermittently.
C. the earths atmosphere absorbs light intermittently.
D. the refractive index of the air in atmosphere fluctuates.
Explanation:
840. In fireworks, the green flame is produced because of :
A. mercury
B. sodium
C. potassium
D. barium
Explanation:
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