41.Chandragupta II fought war with the

42.To a person on the moon, the sky appears

43.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) : Sound waves cannot be polarised.Reason (R) : Sound waves can be longitudinal or transverse.

44.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) : Radius of atom decreases from left to right across a period in the periodic table.Reason (R) : The nuclear chrage increases and orbital electrons are pulled in closer.

45.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) : Temperature decteases with increasing height above sea level.Reason (R) : Atmosphere is mainly heated by conduction from the earth.