Explore topic-wise MCQs in Microbiology.

This section includes 126 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following is/are included in Kingdom ?

A. Bacteria
B. Protozoa
C. Fungi
D. All of these
Answer» B. Protozoa
2.

A medicine which contain dead or weakened germs is used to prevent infectious disease is called a

A. antiseptic
B. antibodies
C. antibiotics
D. vaccine
Answer» E.
3.

Diseases which are caused by micro-organisms are called

A. contagious
B. venereal
C. infectious
D. incurable
Answer» D. incurable
4.

The pores in the bread is due to gas bubbles of

A. Oxygen
B. Nitrogen di oxide
C. Nitrogen
D. Carbon di oxide
Answer» E.
5.

The microbe for Malaria is carried by

A. Male Anopheles mosquito
B. Female Anopheles Mosquito
C. Male Aedes mosquito
D. Female Aedes mosquito
Answer» C. Male Aedes mosquito
6.

Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called _______

A. Medication
B. Antibiotics
C. Vaccination
D. All of the above
Answer» D. All of the above
7.

Rhizobium found in root nodules of leguminous roots is an

A. Atmospheric Carbon fixer
B. Atmospheric Oxygen fixer
C. Atmospheric Nitrogen fixer
D. All of the above
Answer» D. All of the above
8.

Lactobacillus is commonly found in

A. Cake
B. Curd
C. Bread
D. All of the above
Answer» C. Bread
9.

The process of conversion of sugar into alcohol by yeast is called

A. Fermentation
B. Pasteurisation
C. Alcoholism
D. All of the above
Answer» B. Pasteurisation
10.

A common preservative used in jam and pickles is

A. Sodium benzoate
B. Nitric acid
C. Sodium Chloride
D. Copper Sulphate
Answer» B. Nitric acid
11.

Some medicines obtained from micro-organisms are applied to kill or stop the growth of disease-causing microorganisms. Such medicines are called ______.

A. Antibodies
B. Antibiotics
C. Antiseptics
D. All of the above
Answer» C. Antiseptics
12.

Which cannot fix atmospheric nitrogen in the soil?

A. Rhizobium
B. Clostridium
C. Azotobacter
D. Penicillin
Answer» E.
13.

The disease caused by protozoa is

A. tuberculosis
B. polio
C. typhoid
D. malaria
Answer» E.
14.

The microorganism which contains chlorophyll

A. Virus
B. Fungus
C. Algae
D. All
Answer» D. All
15.

Bacteria present in root nodules of pea

A. Coli
B. Plasmodium
C. Rhizobium
D. Penicillin
Answer» D. Penicillin
16.

The rod shaped bacteria are called

A. Bacillus
B. Coccus
C. Vibrio
D. Spirillum
Answer» B. Coccus
17.

The status of algae in the aquatic food chain is

A. consumers
B. producers
C. host
D. small in size
Answer» C. host
18.

What helps in the rise of bread or dosa dough?

A. Heat
B. Grinding
C. Growth of yeast cells
D. Low pressure
Answer» D. Low pressure
19.

Which of the following is a disease caused by protozoans?

A. Tuberculosis
B. Polio
C. Malaria
D. Typhoid
Answer» D. Typhoid
20.

Which organisms are microscopic and dependent on host organisms for reproduction?

A. Algae
B. Protozoa
C. Viruses
D. Bacteria
Answer» D. Bacteria
21.

______ is used for the production of alcohol and wine.

A. Yeast
B. Mosquito
C. Ant
D. Algae
Answer» B. Mosquito
22.

Which of the following diseases can be cured using antibiotics?

A. AIDS
B. Dengue
C. Typhoid
D. Malaria
Answer» D. Malaria
23.

The bacterium present in curd is:

A. Salmonella typhi
B. Lactobacillus
C. Penicillin
D. Vibrio cholera
Answer» C. Penicillin
24.

While baking cakes, yeast reproduces rapidly and produces ___ gas.

A. Hydrogen
B. Oxygen
C. carbon dioxide
D. nitrogen
Answer» D. nitrogen
25.

Vaccines are made up of:

A. Chemicals
B. Weak microorganisms
C. Viruses
D. Drugs
Answer» C. Viruses
26.

Which of the following is a communicable disease?

A. Diabetes
B. Chicken pox
C. Alzheimer s
D. Cancer
Answer» C. Alzheimer s
27.

Partial sterilization of a product such as milk at a high temperature is known as:

A. Pasteurization
B. Filtration
C. Pickling
D. Refrigeration
Answer» B. Filtration
28.

Living organisms which are invisible to the naked eye are called _________ .

A. Particles
B. Molecules
C. Microorganisms
D. Macroorganisms
Answer» D. Macroorganisms
29.

The shape of coccus bacteria is generally

A. Spherical
B. Rod like
C. Comma shaped
D. Spiral
Answer» B. Rod like
30.

Mycology is the study of

A. Bacteria
B. Fungi
C. Insects
D. Parasites
Answer» C. Insects
31.

Which among the following pathogens causes cholera?

A. Bacteria
B. Protozoan
C. Fungus
D. Virus
Answer» B. Protozoan
32.

Of all micro-organisms, the most adaptable and versatile are -

A. Viruses
B. Bacteria
C. Algae
D. Fungi
Answer» C. Algae
33.

Which among the following statements is not associated with food preservation?

A. Prevention of decay or spoilage
B. Decreased shelf life
C. Air-tight sealing
D. Storage for future use
Answer» C. Air-tight sealing
34.

Which one of the following is not produced by the process of fermentation?

A. Cheese
B. Milk
C. Yoghurt
D. Wine
Answer» C. Yoghurt
35.

A plant disease called citrus canker is caused by a _________ .

A. Bacteria
B. Fungi
C. Protozoa
D. Virus
Answer» B. Fungi
36.

Which one of the following is not a method of food preservation?

A. Salting
B. Drying
C. Boiling
D. Pickling
Answer» D. Pickling
37.

_______ are the agents that act as carriers of a pathogen and spread diseases.

A. Vectors
B. Microbes
C. Parasites
D. DNA
Answer» B. Microbes
38.

An infectious disease is ___________ .

A. caused only by bacteria
B. spread from person to person
C. spread from animal to animal
D. caused only by viruses
Answer» C. spread from animal to animal
39.

What is shape of an amoeba?

A. Spherical
B. Elongated
C. Spiral
D. No definite shape
Answer» E.
40.

Who discovered the process of fermentation?

A. Edward Jenner
B. Louis Pasteur
C. Jonas Salk
D. William Harvey
Answer» C. Jonas Salk
41.

The shape of Bacillus bacteria is generally

A. Spherical
B. Comma shaped
C. Rod like
D. Spiral
Answer» D. Spiral
42.

Which of these is an autotroph?

A. Cuscuta
B. Algae
C. Bacteria
D. Mushroom
Answer» C. Bacteria
43.

Rhizobium, the organism found in root nodules of legumes are

A. Bacteria
B. Fungi
C. Lichen
D. Algae
Answer» B. Fungi
44.

Organisms which take in nutrients from dead and decaying matter are called

A. Autotrophs
B. Heterotrophs
C. Saprotrophs
D. Autoheterotrophs
Answer» D. Autoheterotrophs
45.

A lichen is a composite organism consisting of

A. Algae & Bacteria
B. Bacteria & Virus
C. Virus &Fungi
D. Algae & Fungi
Answer» E.
46.

Spirogyra is a type of

A. Bacteria
B. Virus
C. Algae
D. Fungi
Answer» D. Fungi
47.

Baltimore system is used to classify

A. Viruses
B. Bacteria
C. Fungi
D. Protozoa
Answer» B. Bacteria
48.

Viruses that infect bacteria are called

A. Methanogens
B. Pathogens
C. Lichens
D. Bacteriophages
Answer» E.
49.

Agar is placed in a petri dish and some soil is sprinkled on the agar. The lid is placed on the petri dish, and it is incubated for two days. After two days, areas of bacteria and fungi are visible on the agar.

What is the name for these areas?

A. Nutrient
B. Antibiotics
C. Microorganisms
D. Colonies
Answer» E.
50.

To which one of the following types of organism do mushrooms belong?

A. Algae
B. Ferns
C. Fungi
D. Lichens
Answer» D. Lichens