1. _____ is used to removes microorganisms from heat sensitive liquid of gases.
a) Inceneration
b) Filtration
c) pasteurization
d) Ionization
Answer : b
2. Seitz filter is made up of ____.
a) Diatomaceous earth
b) Asbestos
c) cellulose acetate
d) cellulose nitrate
Answer : b
3. Which instrument works on the principle of cooker?
a) Hot air Oven
b) Laminar air flow
c) Autoclave
d) Arnold sterilizer
Answer : c
4. Which radiation is called as ionizing radiation?
a) Gamma rays
b) ultra violet radiations
c) visible rays
d) None of these
Answer : a
5. The germicidal action of alcohol is due to its ability to ____.
a) Dissolve membrane lipid
b) increase permeability
c) Cause dehydration
d) All of these
Answer : d
6. Lysol is commercial preparation mostly used as disinfectant for _____.
a) skin
b) Glass
c) Inanimate object
d) Milk
Answer : c
7. Autoclave cannot be used for sterilization of ______.
a) Oil
b) calcium carbonate
c) Paraffin wax
d) All of the above
Answer : d
8. Inoculating needle is sterilized by _____.
a) Flaming
b) Inceniration
c) Autoclaving
d) Arnold sterilization
Answer : a
9. The process using temperature below 100°C ______.
a) LTH
b) HTST
c) Pasteurization
d) All of these
Answer : d
10. The mode of action of dry heat is _____ .
a) Protein denaturation
b) Oxidative damage
c) Direct burning of cell constituents
d) All of these
Answer : d
11. The time required for sterilization is _____ proportional to the temperature of exposure.
a) Directly
b) Inversely
c) There is no relation between temperature and exposure time
d) All of the above are correct
Answer : b
12. TDT stands for _____ .
a) Thermal death point
b) Thermal death Time
c) Thermal reduction time
d) Thermal deduction time
Answer : b
13. Which among the following is an example of sterilization technique using moist heat at 100°C .
a ) Flaming
b) Boiling
c) Incineration
d) Pasteurization
Answer : b
14. Boiling point of water is inversely proportional to the pressure applied on it.
a) True
b) False
Answer : b
15. The lowest temperature required to kill a standard suspension of organisms in fixed time is called _____ .
a) TDP
b) TDT
c) Decimal reduction time
d) D value
Answer : a
16. Staphylococcus aureus shows _____ type of arrangement.
a) Rod in chain
b) Isolate rods
c) Cocci in chain
d) Cocci in cluster
Answer : d
17. Which among the following is not the function of cell wall.
a) Gives definite shape to the cell
b) Gives definite cellular structure
c) Allows cell to move from on place to other
d) offers selective permeability
Answer : c
18. An bacteria having at least one flagellum at each end of the cell is called ______ flagellation.
a) Monotrichous
b) Lophotrichous
c) Ampitrichous
d) Peritrichous
Answer : c
19. Which among the following cell inclusion is lipid in nature?
a) Metachromatic granules
b) Volutin granules
c) poly beta hydroxybutyrate granules
d) Phosphate granules
Answer : d
20. Each Glycan strand is composed of ______ .
a) NAG
b) NAM
c) Beta 1,4 glyosidic linkage
d) All of these
Answer : d
21. The bacterial ribosome is _____ type.
a) 80S
b) 70S
c) 40S
d) 50S
Answer : b
22. The study of size, shape structure and arrangement of bacterial cell is referred as _____.
a) Cytology
b) Morphology
c) Microbiology
d) Botany
Answer : b
23. Flagella is made up of _____ .
a) Basal body
b) Hook
c) Filament
d) All of these
Answer : d
24. Chemical composition of gram negative cell wall consists mainly of.
a) Peptidoglycan
b) Proteins
c) Phospholipid
d) None of these
Answer : c
25. Cell wall of gram positive bacteria consists mainly of _____ .
a) Phospholipid
b) Carbohydrate
c) Lipids
d) Peptidoglycan
Answer : d
26. Fluid Mosaic model is used to explain the structure of ___.
a) flagella
b) cell wall
c) cell membrane
d) capsule
Answer : c
27. Bacterial cell, possessing single flagella at one pole is called ______ flagella.
a) Polar
b) monotrichous
c) Both A and B
d) Lophotricus
Answer : c
28. Which of the following fails to kill endospores.
a) Hot air oven
b) Autoclave
c) UV radiotions
d) Pasteurization
Answer : d
29. Which organelle is essential for viability of call?
a) Capsule and slime layer
b) Cell membrane
c) Flagella
d) Pillus
Answer : b
30. If 15X ocular and oil immersion objective are used to observe an object, what will be its final magnification?
a) 100 X
b) 200 X
c) 1000 X
d) 1500 X
Answer : d
31. Which among the following can be sterilized by using dry heat?
a) Rubber gloves
b) Culture media
c) Glasswares
d) Milk
Answer : c
32. The ability of microscope to distinguish two closely placed objects as separate is called _____ .
a) Numerical Aperture
b) Resolving Power
c) Magnifying power
d) None of the above
Answer : b
33. Which among the following is used for studying surface details of microbes or metals.
a) Transmission electron microscope
b) Scanning electro microscope
c) Simple microscope
d) Compound Microscope
Answer : b
34.Which among the following is most commonly used condenser?
a) Abbes
b) Cardioids
c) Parabolic
d) All of these
Answer : a
35. A microscope consisting of only one lens is called as ___ .
a) Simple Microscope
b) Compound microscope
c) Phase contrast microscope
d) Electron microscope
Answer : a
36. In electron microscope, instead of glass lens _____ works as lens.
a) Electrons
b) Magnetic coil
c) Fluorescent light
d) Electrical lens
Answer : b
37. In Transmission Electron Microscope, the source of illumination is ____ .
a) Halogen lamp
b) Beta rays
c) Electron gun
d) Electron beam
Answer : c
38. The distance between the optical centre and the focal point is called ____ .
a) Focal diameter
b) Focal length
c) Focal centre
d) working distance
Answer : b
39. Which among the following is the most important tool for a microbiologist.
a) Microscope
b) Telescope
c) Glass slide
d) Binocular
Answer : a
40. When a ray of light passes from a rarer ( air ) to a denser medium ( glass ), it is ____.
a) Transmitted towards the Right side
b) Reflected away from the objects
c) bent towards the normal
d) None of the above
Answer : c