At which stage of HIV infection does one usually show symptoms of AIDS?

1. Within 15 days of sexual contact with an infected person 

2. When the infected retro virus enters host cells

3. When HIV damages large number of helper T-Lymphocytes

4. When the viral DNA is produced by reverse transcriptase 

The cell-mediated immunity inside the human body is carried out by 

1. T-lymphocytes

2. B-lymphocytes

3. thrombocytes

4. erythrocytes

Motile zygote of Plasmodium occurs in

1. gut of female Anopheles

2. salivary glands of Anopheles

3. human RBCs

4. human liver

Widal test is carried out to test 

1. malaria

2. diabetes mellitus 

3. HIV/AIDS

4. typhoid fever

Common cold differs from pneumonia in that

1. pneumonia is a communicable disease, whereas the common cold is a nutritional

deficiency disease

2. pneumonia can be prevented by a live attenuated bacterial vaccine, whereas the

common cold has no effective vaccine

3. pneumonia is caused by a virus, while the common cold is caused by the bacterium

Haemophilus influenzae

4. pneumonia pathogen infects alveoli whereas the common cold affects nose and

respiratory passage but not the lungs

Which one of the following is not a property of cancerous cells, whereas the remaining

three are ?

1. They compete with normal cells for vital nutrients.

2. They do not remain confined in the area of formation 

3. They divide in an uncontrolled manner 

4. They show contact inhibition 

Cirrhosis of liver is caused by the chronic intake of 

1. opium

2. alcohol

3. tobacco(chewing)

4. cocaine

A certain patient is suspected to be suffering from acquired immuno deficieny syndrome.

Which diagnostic technique will you recommend for its detection?

1. MRI

2. Ultra Sound

3. WIDAL

4. ELISA

Which one of the following acts as a physiological barrier to the entry of microorganisms

in human body?

1. Tears

2. Monocytes

3. Skin

4. Epithelium of urogenital tract

Where will you look for the sporozoites of the malarial parasite?

1. Red blood corpuscles of humans suffering from malaria

2. Spleen of infected humans

3. Salivary glands of freshly moulted female Anopheles mosquito

4. Saliva of infected female Anopheles mosquito