21.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.

22.Which of the following countries was fomerly known as Siam ?

23.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) : When a wheel is in motion, a point (on the rim) which is farthest away from teh ground will have the highest speed while the point (on the rim) closest to the ground will have the lowest speed.Reason (R) : The speed of teh point on teh rim in the direction of motion and along the circumference of the wheel are additive.

24.Pulakesin II was a contemporary of

25.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) : Most of the sounds we hear travel through air, but sound can also travel through solids and liquids.Reason (R) : All sounds are produced due to vibrations.