Size of the Nano particles varies from __________.
a.
100 nm or more
b.
Less than 10 nm
c.
10 nm or more
d.
100 nm or less
Correct Answer
Step-by-Step AI Explanation
Verified Method
Nano particles are usually defined as particles with size of 100 nm or less, so the correct answer is (d) 100 nm or less. Options (a) and (c) are too large for the nano range, and (b) is too small and does not represent the full nano-scale range.
Q2mcq1 mark
Which among the following helps us in getting a 3-D picture of specimen ?
a.
Compound microscope
b.
TEM
c.
Simple microscope
d.
SEM
Correct Answer
Step-by-Step AI Explanation
Verified Method
Scanning Electron Microscope (SEM) helps us obtain a 3-D picture of the specimen, so the correct answer is (d) SEM. A compound microscope and a simple microscope give only a 2-D view, while TEM provides internal details of thin specimens but not a 3-D surface image.
Q3mcq1 mark
Which of the following agents are used as a preservative in Ophthalmic Solution ?
a.
Phenol
b.
Alcohol
c.
Aldehydes
d.
Quaternary ammonium salts
Correct Answer
Step-by-Step AI Explanation
Verified Method
Quaternary ammonium salts are used as preservatives in ophthalmic solutions, so the correct answer is (d). Phenol, alcohol, and aldehydes are used mainly as disinfectants or preservatives in other preparations, not typically for ophthalmic solutions.
Q4mcq1 mark
__________ is used in lake and swimming pools to retard the growth of algae.
a.
Formaldehyde
b.
Copper sulphate
Correct Answer
c.
Alcohol
d.
Silver nitrate
Step-by-Step AI Explanation
Verified Method
Copper sulphate is used in lakes and swimming pools to retard the growth of algae, so the correct answer is (b). Formaldehyde is a disinfectant, alcohol is used as an antiseptic/disinfectant, and silver nitrate is used for specific antimicrobial purposes, not for controlling algae in water bodies.
Q5mcq1 mark
For every one molecule of sugar glucose which is oxidized __________ molecule of pyruvic acid are produced.
a.
3
b.
1
c.
4
d.
2
Correct Answer
Step-by-Step AI Explanation
Verified Method
One molecule of glucose, when oxidized in glycolysis, produces 2 molecules of pyruvic acid, so the correct answer is (d) 2. The other options are incorrect because glucose does not yield 1, 3, or 4 pyruvate molecules in this process.
Q6mcq1 mark
The micro-organisms grow best at pH value around :
a.
3.4
b.
4.0
c.
9.2
d.
7.0
Correct Answer
Step-by-Step AI Explanation
Verified Method
Micro-organisms generally grow best at neutral pH, around 7.0, so the correct answer is (d). A pH of 3.4 or 4.0 is too acidic for most microbes, and 9.2 is too alkaline for their optimum growth.
Q7mcq1 mark
__________ is an example for primary screening.
a.
Auxanography
Correct Answer
b.
Photography
c.
Telegraphy
d.
Cinematography
Step-by-Step AI Explanation
Verified Method
Auxanography is an example of primary screening, so the correct answer is (a). It is used to detect microorganisms that produce a particular nutrient or growth factor. The other options—photography, telegraphy, and cinematography—are unrelated to microbial screening.
Q8mcq1 mark
Weil's disease is caused by which of the following bacteria ?
a.
Leptospira interrogans
Correct Answer
b.
Salmonella typhi
c.
Vibrio cholerae
d.
Escherichia coli
Step-by-Step AI Explanation
Verified Method
Weil's disease is caused by Leptospira interrogans, so the correct answer is (a). Salmonella typhi causes typhoid, Vibrio cholerae causes cholera, and Escherichia coli is associated with various intestinal and urinary infections.
Q9mcq1 mark
__________ is the causative agent of Syphilis.
a.
Treponema pallidum
Correct Answer
b.
Neisseria meningitidis
c.
Staphylococcus aureus
d.
Streptococcus pyogenes
Step-by-Step AI Explanation
Verified Method
Syphilis is caused by the bacterium Treponema pallidum, a spirochete. Neisseria meningitidis causes meningococcal infections, Staphylococcus aureus causes skin and other pyogenic infections, and Streptococcus pyogenes causes diseases such as scarlet fever and pharyngitis.
Q10mcq1 mark
This disease was first observed by Leeuwenhoek after he discovered parasitic organisms in his stool under the microscope.
a.
Malaria
b.
Chaga's disease
c.
Ascariasis
d.
Giardiasis
Correct Answer
Step-by-Step AI Explanation
Verified Method
Giardiasis is the disease first observed by Leeuwenhoek when he examined his stool under the microscope and noticed parasitic organisms. It is caused by the protozoan Giardia lamblia. Malaria is caused by Plasmodium, Chaga's disease by Trypanosoma cruzi, and ascariasis by Ascaris lumbricoides.
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