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General Science - Questions and Answers

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501. The most intense man-made light source is
A. Laser
B. Light emitting diode
C. Maser
D. Mercury vapour lamp
Explanation:
502. Radioactive disintegration of uranium ultimately results in formation of
A. radium
B. thorium
C. polonium
D. lead
Explanation:
503. 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) : Noble gases are highly unstable i.e. these can form compounds as easily as other elements can.Reason (R) : Valence shells of noble gases are complete.
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:
504. 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) : A particle moving in a uniform circular motion has uniform velocity.Reason (R) : The particle also has a uniform speed.
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:
505. Which of the following is used as good biofertiliser in rice fields ?
A. Cow dung
B. Azolla
C. A green legume
D. Moss
Explanation:
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