1341: There is some concern regarding the nanoparticles of some chemical elements that are used by the industry in the manufacture of various products. Why?
1. They can accumulate in the environment, and contaminate water and soil.
2. They can enter the food chains.
3. They can trigger the production of free radicals.
Select the correct answer using the code given below.
(a) 1 and 2 only
(b) 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
1342: Living organisms require at least 27 elements of which 15 are metals. Among these, those required in major quantities include
(a) Potassium, Manganese, Molybdenum & Calcium
(b) Potassium, Molybdenum, Copper & Calcium
(c) Potassium, Sodium, Magnesium & Calcium
(d) Sodium, Magnesium, Copper & Manganese
1343: A girl is swinging on a swing in sitting position. When the same girl stands up, the period of swing will
(a) be shorter
(b) be longer
(c) depend on the height of the girl
(d) not change
1344: Assertion (A): Existence of human life on Venus is highly improbable.
Reason (R): Venus has extremely high level of carbon dioxide in its atmosphere.
(a) Both A and R are individually true and R is the correct explanation of A.
(b) Both A and R are individually 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.
1345: Consider the following pairs Organization
Organization -- Location of Headquarters
1. Asian Development Bank -- Tokyo
2. Asia-Pacific Economic Cooperation --Singapore
3. Association of South East Asian Nations -- Bangkok
Which of the above pairs is/are correctly?
(a) 1 & 2
(b) 2 only
(c) 3 only
(d) 2 & 3