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346. Consider the following statements : A. Pure germanium is doped with pentavalent metals like antimony and phosphorus to make it n-type semiconductor. B. Pure germanium is doped with trivalent metals like gallium and indium to make it p-type semiconductor.
A. Both A and B are true.
B. Both A and B are false.
C. A is true byt B is false.
D. A is false but B is true.
Explanation:
347. Which of the following show the masses of the three elementary particles in decreasing order ?
A. Mesons, Baryons, Leptons
B. Leptons, Baryons, Mesons
C. Baryons, Mesons, Leptons
D. Leptons, Mesons, Baryons
Explanation:
348. Which of the following is used as an insecticide ?
A. Organochlorine
B. Organophosphate
C. Carbamate
D. Phyrethrin
Explanation:
349. 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) : Blood group O is a universal donor. 2. Reason (R) : Blood type O has both antigen A and B.
A. Both A and R are true but 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:
350. 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 ?Assertion (A) : Birds do not lay eggs by millions as some of teh lower animals do.Reason (R) : Survival rate is much higher because of the parental care.
A. Both A and R are true but 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:
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