61.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 gas thermometer is more sensitive thana liquid thermometer.Reason (R) : Gases can be heated to high temperatures whereas liquids vaporise at a particular temperature.

62.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) : Bats can fly in the dark.Reason (R) : Bats navigate using sound waves.

63.The most intense man-made light source is

64.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.

65.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.