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526. Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : In very cold regions in the vocinity of the cold surface of a lake or snow field, the image of a shop will appear lifted in mid-air.Reason (R) : Total internal reflection takes place causing the phenomenon of looming.
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:
527. Lightning conductors are made of
A. iron
B. steel
C. copper
D. aluminium
Explanation:
528. Sake is a favourite wine of Japanese. It is made from
A. vinegar
B. grape juice
C. rice grains
D. palm sap
Explanation:
529. Which of the following micro- organisms are involved in nitrogen fixation ? 1. Blue green algae 2. Rhizobium 3. Azotobacter
A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
Explanation:
530. Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Oxygen gives reddish brown fumes with nitric oxide.Reason (R) : Oxygen is a diatomic molecule.
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:
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