General Science - Questions and Answers

561. 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) : Carbon dioxide is neither combustible nor a supporter of combustion but a burning magnesium wire continues to burn in it.Reason (R) : Magnesium reduces carbon dioxide to carbon and hence the wire continues to burn in it.

562. Which of the following statements regarding Lead Crystal Glass are correct ? 1. It is made by using lead oxide as flux. 2. It has a high refractive index, and sparkles. 3. It is used for high quality art objects and for expensive glassware.

563. 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) : An electric current flowing through a wire deflects a magnetic needle placed in its neighbourhood in such a way that the needle assumes a position perpendicular to the plane passing throug the wire and through the centre of the needle.Reason (R) : An electric current is a stream of moving charges which create a magnetic field whose direction is at right angles to the direction of the current.

564. 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) : Pure potash is a good farm manure.Reason (R) : Potash minerals are vital to plants, assisting starch formation.

565. 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) : Bauxite is the chief ore of aluminium..Reason (R) : Bauxite is found in the hilly regions of Uttar Pradesh.