General Science - Questions and Answers

546. Consider the following statements : 1. Gamma rays are not constituents of nuclei but they are emitted when a nucleus in an excited state returns to its normal state. 2. The neutron to proton ration for stable nuclei is always less than one. 3. Beta rays consist of ordinary electrons which are of nuclear origin but do not revolve in orbits. 4. Both X - rays and gamma rays are electromagnetic radiations.

547. 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) : Drug abuse is a cognizable offence.Reason (R) : Drug abuse is an antisocial activity.

548. Which of the following pairs belongs to the category of cold-blooded animals ?

549. 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) : Epidemics of infectious diseases are seasonal.Reason (R) : They are caused by various agents such as virus, bacteria, fungi and protozoa.

550. 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) : Motion picture depicting scene of a hill area gives a continuous motion of objects with surroundings. 2. Reason (R) : In the retina of human eyes these continuous images get fused into one another.