RSMSSB LDC Exam Paper 2018 (H to M) in English (Answer Key)

21. Which of the following properties of light is used in making a periscope ?
(A) Polarization
(B) Dispersion
(C) Reflection
(D) Refraction

22. The angle between the incident ray and the ray reflected from a plane-mirror is 60°. Through what angle is the reflected ray deviated with respect to the incident ray ?
(A) 60°
(B) 90°
(C) 150°
(D) 120°

23. Which of the following is not a gaseous type cycle ?
(A) Oxygen cycle
(B) Phosphorus cycle
(C) Nitrogen cycle
(D) Carbon cycle

24. Emasculation is achieved by
(A) Removal of Sepals
(B) Removal of Petals
(C) Removal of Style
(D) Removal of Anther

25. Which of the following microorganism yields restriction enzyme ?
(A) All of these
(B) H-influenzae
(C) I-aquaticus
(D) E-coli

26. Mendel had also worked on one more plant other than pea. That was
(A) Bean
(B) Hieracium
(C) Antirrhinum
(D) Maize

27. Which of the following Rice variety is a popular biopatent ?
(A) Sona Masuri
(B) Basmati
(C) Rajabhogam
(D) Ponni

28. Which disease is caused by deficiency of vitamin C ?
(A) Night blindness
(B) Beri-Beri
(C) Scurvy
(D) Goitre

29. Chromosomes network can network can not be stained by
(A) Feulgen stain
(B) Carmine
(C) Haematoxylin
(D) Crystal violet

30. Producing new crop varieties where two or more plants of, unlike genetic constitution are crossed called as –
(A) Hybridization
(B) Mutation
(C) Asexual Reproduction
(D) Heterosis

31. Vermicompost is considered to be the best ecofriendly manure obtained from
(A) Termites
(B) Earthworms
(C) Nematodes
(D) Ants

32. Which blood group is called universal donor ?
(A) O-
(B) AB-
(C) B+
(D) A+

33. Approximately how much energy is transferred from one trophic level to a another in an ecosystem ?
(A) 60%
(B) 50%
(C) 25%
(D) 10%

34. Ammonofying bacteria convert
(A) Nitrates to ammonia
(B) Nitrites to ammonia
(C) Ammonia to nitrites
(D) Wastes in to ammonia

35. How long biological patent remain effective in India ?
(A) 20 years
(B) 6 years
(C) 10 years
(D) 15 years

36. Sudden heritable changes in an organism is called as –
(A) Clonal selection
(B) Acclimatization
(C) Mutation
(D) Breeding

37. The saponification of a fat or oil is done using ______ solution for hot process.
(A) NaCl
(B) HCI
(C) NaOH
(D) KOH

38. Producer gas is mixture of the following:
(A) CO + H2
(B) CO2 + N2
(C) CO + H2
(D) CO + N2

39. Water gas is a mixture of –
(A) CO and CO₂
(B) CO and H₂O
(C) CO and H₂
(D) CO and N₂

40. Freon group of refrigerants are –
(A) non-toxic and inflammable
(B) non-inflammable and moderately toxic
(C) toxic
(D) inflammable

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