Rajasthan 2022 Previous Year GK Questions with Answers

The correct answer is B, Suspension. A suspension is a heterogeneous mixture because the particles of the solute are large enough to be seen, they do not dissolve, they settle when the mixture is left standing and they can be separated by filtering. Chalk powder stirred into water, muddy water and lime water are everyday examples, and such a mixture scatters a beam of light because the particles are bigger than about one thousand nanometres. A solution, in contrast, is homogeneous: sugar in water or salt in water gives one uniform phase, the particles cannot be seen, nothing settles and filter paper does not hold them back. A colloid, such as milk or fog, lies between the two and is also heterogeneous, though it does not settle. A is wrong because a solution is homogeneous. C is wrong because it wrongly includes the solution. D is wrong because a suspension certainly is heterogeneous. Exam tip: solution homogeneous, colloid and suspension heterogeneous; only the suspension settles.

The correct answer is A, Tube well. Tube wells irrigate the largest share of the net irrigated area of Rajasthan, and groundwater drawn through tube wells and wells together waters the greater part of the state's fields. The reason is the climate: rainfall is low and uncertain over most of the state and perennial rivers are few, so a farmer who wants a second crop has to pump water. This heavy drawing of groundwater has pushed many blocks of Rajasthan into the over-exploited category, which is why drip and sprinkler irrigation are pressed in the state. B is wrong because ponds and tanks serve only small pockets, mostly in the south and south-east. C is wrong because open wells, once the mainstay, now water a much smaller area than tube wells. D is wrong because canals, led by the Indira Gandhi Canal, come second and are limited to the north-west and the Chambal command. Exam tip: in Rajasthan groundwater leads, tube wells first and canals second.

The correct answer is C, Use of chemical fertilizers. The question asks for the odd one out, and the heavy use of chemical fertilisers damages soil rather than conserving it: it acidifies the soil, kills soil microorganisms, leaves salt residues, and the surplus nitrate and phosphate wash into water bodies and cause eutrophication. Soil conservation is achieved with organic manure, green manure and biofertilisers instead. A is a genuine conservation technique, because uncontrolled cattle grazing strips the grass cover and exposes bare soil to wind and rain, so regulating grazing allows pasture to recover. B is a genuine technique, since rotating a cereal with a leguminous crop restores nitrogen through root nodule bacteria and breaks pest cycles. D is also genuine, because strip cropping alternates bands of close-growing crops with row crops so that the dense strips trap the soil carried off the open strips.

The correct answer is B, N.C.E.R.T. Section 29(1) of the Right of Children to Free and Compulsory Education Act 2009 says the curriculum and the evaluation procedure for elementary education shall be laid down by an academic authority notified by the appropriate government, and the Central Government notified the National Council of Educational Research and Training for the schools under it, while the states notified their own SCERTs. Section 29(2) then binds that authority to constitutional values, the all-round development of the child, learning through activity and discovery, teaching in the mother tongue as far as practicable, and continuous and comprehensive evaluation. A is wrong because the N.C.T.E. frames norms for teacher education and teacher eligibility, which the Act deals with in Section 23. C is wrong because N.I.E.P.A. works on educational planning and administration. D is wrong because N.I.O.S. runs open and distance schooling. Exam tip: in the RTE Act, Section 29 gives the academic authority, NCERT, and Section 23 the teacher qualifications through NCTE.