UKSSSC Forest SI Exam Paper 19 July 2021 (1st Shift) Official Answer Key

21. What is the source of carbon to plants in the carbon cycle?
(A) Fossils present in the soil
(B) Organic compounds from water
(C) atmospheric carbon dioxide
(D) Carbonate rocks

22. What is the mass number of an atom that has 3 protons, 4 neutrons and 3 electrons?
(A) 6
(B) 4
(C) 3
(D) 7

23. What is the nature of the Kinetic energy of a satellite orbiting the earth?
(A) Negative
(B) Positive
(C) Zero
(D) Negligible

24. The total mechanical energy of the system is conserved only if all the forces doing work on it are ______.
(A) Conservative
(B) Unbalanced
(C) Non-conservative
(D) Balanced

25. In a/an ________, mechanical energy is used to rotate a conductor in a magnetic field to produce electricity that are predominantly used in industries.
(A) Frequency counter
(B) Psophometer
(C) Vectorscope
(D) Electric generator

26. Which of the following conventions is related to conservation of wetland?
(A) Basel Convention
(B) Rotterdam Convention
(C) Ramsar Convention
(D) Vienna Convention

27. Which of the following is an example of inexhaustible source of energy?
(A) Natural Gas
(B) Petroleum
(C) Solar
(D) Coal

28. What is a large force acting for a short time to produce a finite change in momentum called?
(A) Impulsive force
(B) Gravitational force
(C) Frictional force
(D) Mechanical force

29. Which of the following taxonomic aids is used for the identification of plants and animals based on contrasting characters?
(A) Manuals
(B) Monographs
(C) Key
(D) Catalogs

30. Which among the following is an elaborate network of filamentous proteinaceous structures present in the cytoplasm?
(A) Cytoskeleton
(B) Cilia
(C) Flagella
(D) Ribosomes

31. What is the line about which a rigid body rotates about itself known as?
(A) Centripetal motion
(B) Axis of rotation
(C) Rolling motion
(D) Centrifugal axis

32. The component of contact force normal to the surfaces in contact is called __________.
(A) Normal reaction
(B) Buoyancy
(C) Friction
(D) Tension

33. What is the IUPAC name of C₂H₅OH?
(A) Phenol
(B) Propanal
(C) Ethanol
(D) Methanol

34. The condition of decreasing productivity of land due to human activities is called _____.
(A) Afforestation
(B) Bio-accumulation
(C) Desertification
(D) Incineration

35. Which of the following plants disease is caused by bacteria?
(A) Blast of Paddy
(B) Red rot of sugarcane
(C) Fire blight of apple
(D) Anthracnose of Beans

36. Who among the following discovered the nucleus in cell?
(A) “Anton Von Leeuwenhoek”
(B) “Robert brown”
(C) “Theodor Schwann”
(D) “Matthias Schleiden”

37. Aldehydes having no a-hydrogen atoms undergo ________.
(A) Aldol condensation
(B) Cannizzaro’s reaction
(C) Reimer-Tiemann reaction
(D) None of the above

38. The SI unit of Electric Charge is Coulomb, [C], which is equivalent to the charge contained in nearly ________ electrons.
(A) 1.6*(10¹⁹) 
(B) 6*(10¹⁸)
(C) 6*(10¹⁹)
(D) 1.6*(10¹⁸)

39. Which among the following expresses the value of 1 ohm?
(A) 1 ohm = 1 ampere / 1 volt
(B) 1 ohm = 1 volt * 1 ampere
(C) 1 ohm = 1 volt / 1 ampere
(D) 1 ohm = 1 joule / 1 volt

40. Which of the following is not an ex-situ conservation type?
(A) Botanical garden
(B) Zoological park
(C) Wild life safari park
(D) National park