The 'Widal test' is a diagnostic test used to detect the presence of antibodies against the causative agent of: MCQ with Answer and Explanation

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The 'Widal test' is a diagnostic test used to detect the presence of antibodies against the causative agent of:

A. Malaria

B. Dengue

C. Typhoid fever

D. Tuberculosis

Answer: Option C

Solution (By JKSSB Mock Tests)

The Widal test is a serological agglutination test used to diagnose enteric (typhoid) fever, caused by Salmonella enterica serotype Typhi. It detects the presence of specific antibodies (O and H antigens) in the patient's serum against the O (somatic) and H (flagellar) antigens of the Salmonella typhi bacteria. A significant rise in antibody titer indicates an active or recent infection. It is not used for TB (Mantoux test), malaria (blood smear), or dengue (NS1/IgM).

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Question #1

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The structure that connects the hypothalamus to the pituitary gland is the:

A. Optic chiasm

B. Corpus callosum

C. Pineal stalk

D. Infundibulum

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Correct Answer: Option D

Explanation:
The infundibulum (pituitary stalk) physically connects the hypothalamus to the pituitary gland, transporting hormones and nerve signals.

This question belongs to: Science Biology

Question #2

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Which of the following animals belongs to the class Chondrichthyes?

A. Pristis (Sawfish)

B. Labeo rohita

C. Hippocampus

D. Catla catla

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Correct Answer: Option A

Explanation:
Chondrichthyes are cartilaginous fishes with a skeleton made entirely of cartilage, a ventral mouth, and lack operculum. Pristis (sawfish), Scoliodon (dogfish), and Carcharodon (great white shark) belong to this class. Labeo rohita (Rohu) and Catla catla are Osteichthyes (bony fishes). Hippocampus (seahorse) is also a bony fish. Exam tip: Chondrichthyes = cartilaginous; Osteichthyes = bony.

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Question #3

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The structure that carries urine from the kidney to the bladder is the:

A. Renal pelvis

B. Urethra

C. Ureter

D. Calyx

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Correct Answer: Option C

Explanation:
The ureters are two muscular tubes that propel urine from the renal pelvis of each kidney to the urinary bladder via peristaltic contractions. Urethra exits bladder, renal pelvis and calyces are within the kidney.

This question belongs to: Science Biology

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