4421: Assertion (A) : There are no tea plantations in any African country.
Reason (R) : Tea plants need fertile soil with high humus.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually 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
4422: Which one of the following Articles of the Indian Constitution provides that "It shall be the duty of the Union to protect every State against external aggression and internal disturbance"?
(a) Article 215
(b) Article 275
(c) Article 325
(d) Article 355
4423: Who among the following Governor Generals created the Covenanted Civil Service of India which later came to be known as the Indian Civil Service ?
(a) William Bentinck
(b) Warren Hastings
(c) Wellesley
(d) Cornwallis
4424: Assertion
Comets have gaseous tails
Reason
They are very hot bodies
(a) if A and R both are correct and R is the correct explanation of A
(b) if A and R both are correct but R is not the correct explanation of A
(c) if A is correct and R is incorrect
(d) if A is incorrect and R is correct
4425: When a CD (Compact Disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
(a) reflection and diffraction
(b) reflection and transmission
(c) diffraction and transmission
(d) refraction, diffraction and transmission