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Pathology Most Important MCQ with Explanation,

 1. Most common cancer worldwide is :

A. Breast Cancer

B. Bladder Cancer

C.Lung Cancer 

D. Ovarian Cancer

EXPLANATION: Ans: C. Lung Cancer

Most common Cancer among males worldwide is Lung cancer.

Most common Cancer among females worldwide is Breast cancer

Most common Cancer among males Indias Oro-Pharyngeal cancer

Most common Cancer among females India is Breast cancer followed by Cervical Cancer.



2 Most common Lung Cancer in India is:

A. Small cell Cancer

B. Adeno Cancer

C. Squamous cell Cancer

D. Large cell Cancer

EXPLANATION: Ans: C. Squamous cell Cancer 


Most common lung cancer worldwide is adenocarcinoma

Most common lung cancer in India (Asia): Squamous sell carcinoma

Most common lung CANCER in women in adenocarcinoma

 Most common lung cancer in smokers is squamous cell carcinoma

Most common lung cancer in non smokers is adenocarcinoma

Most common lung cancer in young patients is adenocarcinoma

Most common lung cancer to metastasis is small cell carcinoma



3. Most common occupational malignancy in India is:

A. Breast

C. Skin

B. Lungs

D. Bladder

EXPLANATION:   Ans C-  Skin

occapational malignancy affects -

Skin 75% (Most Common).

Lungs

Bladder

Blood forming organs



4 Serum sickness is which type of hypersensivity reaction

A. I

B. II

C III

D. IV

EPLANATION: Ans: C. III


5. Hypersensitivity Pneumonitis is classically described as a?

A. Type I hypersensitivity reaction

B. Type Il hypersensitivity reaction

C. Type III (Immune complex) Hypersensitivity 

D. Type IV (Cell mediated) Hypersensitivity


EXPLANATION: Ans: C. Type III (Immune complex) Hypersensitivity

"Hypersensitivity Pneumonitis is Type III  immune complex) hypersensitivity


.6. The immunoglobulin involved in type l hypersensitivity reaction is:

A.  IgE

B. IgM

D. IgG

C. IgA

EXPLANATION: Ans: A. IgE 

*The immunoglobulin involved in type l hypersensitivity reaction is IgE

7. All are type II hypersensitivity reaction except:

A Steven Johnson's syndrome

B. Drug induced hemolytic anemia

C. Drug induced thrombocytopenia

D. Hemolytic disease of newborn

EXPLANATION: Ans: A. Steven Johnson's syndrome 

"All blood related diseases comes under Hypersensitivity reaction type II, So Steven johson's Syndrome is best answer in given above options"


8. Kaposi Sarcoma caused by -

A. HSV 8

B. 'HIV-1

C. HIV II

D. HPV 8

EXPLANATION: Ans: A. HSV 8 

Most common carcinoma in AIDS.

Caused by HHV-8

Arising form Blood vessels (Vascular Tumor)

HSV 8 - HERPES SIMPLEX VIRUS

HHV8 - HUMAN HERPES VIRUS

HPV 8 - HUMAN PAPILOMA VIRUS


9. Which of the following is X-linked dominant:

A. Duchenne's Muscular Dystrophy

B. G6PD deficiency

D.. Vit-D résistant rickets

C. Color blindness

EXPLANATION: Ans: D. Vit-D résistant rickets

# G6PD-  glucose-6-phosphate dehydrogenase

10. Which of the following is NOT inherited as X-linked disease: 

A. Hemophilia A

B. G6PD deficiency

C. Color blindness

D.  cystic fibrosis

EXPLANATION: Ans: D. Cystic Fibrosis 

Cystic fibrosis is an inherited as Autosomal Recessive 


11. All of the following factor are affected by warfarin EXCEPT:

A. Factor II

B. Facto: IX

C. Factor VIII

D. Factor X

EXPLANATION: Ans: C. Factor VIII 

Antidote of warfarin is vitamin k.

Vitamin K dependent clotting factors are IIa VIIa, IX, Xa

Also REMEMBER:

WEPT -Warfarin effects Extrisic Pathway and monitored by PT.

HINT-Heparin effects INtrinsic Pathway and monitored by aPTT.



12. A 40 yr old male had undr gone splenectomy 20 yr ago. Peripheral blood smear examination would show the presence of:

A. Dohle bodies

B. Hypersegmented neutrophils

D. Howell-jolly bodies

C. Spherocytes

EXPLANATION: Ans: D. Howell-jolly bodies


Howell-Jolly bodies are histopathological findings of basophilic nuclear renmants (clusters of DNA) in circulating erythrocytes":


# Howell-jolly bodies are seen in Splenectomy due in trauma

# Asplenia.

# Sickle cell anaemia 

# Autosplenectomy


Also REMEMBER

HISTOPATHOLOGICAL CHARACTERISTICS


O Bollinger bodies                                O Fowl pox

O Russell bodies                                   O Multiple myeloma

* Halberstaedter Prowazeke bodies      * Chlamydia trachomatis

O Ditcher bodies                                     o Waldenstorm macroglobulinemia

O Dohle bodies                                       OSevere inflammatory disease or sepsis

O Mason bodies                                    OBronchiolitis obliterans with organizing pneumonia

o Heinz bodies                                        *Glucose-6-phosphate deficiency

                                                                * Thalassemia

13. Russel bodies are seen in:

A. Plasma cells

C Neutrophil

B. Esinophills

D. Myeloma cells

EXPLANATION: Ans: A. Plasma cells


Russell bodies are eosinophilic, large homogenous immunoglobulin containin, inclusions usually found in a plasma cell under going excessive synthesis of immunoglobulin, the Russell body is characterstic of the distended endo-plasmic reticulum

*Russel bodies are seen in Multiple myeloma

14. Risk of transmission of HIV in needle prick is:

A. 0.3%

C 3-30%

B. 2-3%

D. 30.%

EXPLANATION: Ans: A. 0.3% 

Risk factor of transmission of needle prick injury in

HIV - 0.3%

HCV-2-3%

HBV - 30"

15. Window period of HIV is detected by:

A. Western blot

B. RT-PCR

C. Elisa

D. CD-4 count

EXPLANATION: Ans: B. RT-PCR 

# Window Period entry of organism till appearance of antibodies

# IOC in window period of AIDS is RT-PCR.

# Most sensitive test for HIV is ELISA.

# Most specific test for HIV is WESTERN BLOT.

# RT-PCR -Reverse transcription polymerase chain reaction

# ELISA-  enzyme-linked immunosorbent assay

# CD4 - cluster of differentiation  AND Known As  cluster of designation or classification determinant 

Test                                                                                          Mneumonic

WESTERN BLOT                PROTEINS                         WEST - PIZZA

SOUTHERN BLOT                   DNA                               SOUTH - DOSA

NORTHERN BLOT                  RNA                               NORTH - ROTI

ALSO REMEMBER

Opportunistic infections in HIV are as follows-

TB                                          < 400 CD 4 cell count

Toxoplasma                           <200 CD 4 cell count

Cryptococcus Neoformans < 100 CD 4 cell count

CMV                                     <50 CD 4 cell count

Cytomegalovirus (CMV

16. All are seen in nephrotic syndrome EXCEPT:

A. Oedema

B. RBC cast in urine

C. Hypo proteinemia

D. Hyperlipidemia

EXPLANATION: Ans: B. RBC cast in urine

Nephrotic syndrome

# Hypoproteinemia: low molecular weight proteins lost in urine.(<3.5g/24hrs)

# Hypoalbuminemia - <3g/dl) due to disturbed plasma colloid osmotic pressure

# Oedema

# Hyperlipidemia:

VLDL (Very-low-density lipoprotein )

LDL (low-density lipoprotein )

HDL ( (high-density lipoprotein),

# Lipiduria

# Renal vein thrombosis: due to antithrombin III deficiency that leads to increased tendancy to clot.

17. EBV associated with all EXCEPT:

A. Hodgkins

B. Non-Hodgkins

C. Kaposi sarcoma

D. Nasopharyngeal carcinoma

EXPLANATION: Ans: C. Kaposi sarcoma


EBV Associated tumors are-   ( EBV -Epstein–Barr virus )

Infectious Mononucleosis

Oral Hairy Leukoplakia

Nasopharyngeal CA

B-Cell Non Hodgkin Lymphoma

Hodgkin Lymphoma

Lymphomas in immuno compromised

 Hodgkin's disease — is a cancer of the lymphatic system, 

18  Which of the following structure does NOT forms the stomach bed:

A The left kidney

B Hepatic flexure of colon

C The pancreas

D. Transverse mesocolon

ELANATION: Ans: B. Hepatic flexure of colon 

@ Structures forming stomach bed are:

Pancreas

Spleen

Left Kidney

Left Suprarenal gland

Transverse colon and its mesocolon

Diaphragm

19 Most common anterior mediastinal tumor is:

A Thymoma

B Cystic lesions

C Neurogenic tumor

D. Bronchogenic cyst

EXPLANATION: Ans: A. Thymoma 

# Most common anterior mediastinal tumor is Thymoma.

# Most common lesion associated with pulmonary system is Bronchogenic Cyst.

# Most common middle mediastinal tumor is Cystic lesions.

# Most common Posterior mediastinal tumor is Neurogenic tumor.

20. Coagulative necrosis occur in all EXCEPT:

A Brain

C Heart

B. Liver

D. Kidney

ESPLANATION: Ans: A. Brain 

# coagulative necrosis seen almost all organs except Brain.in brain Liquefactive Necrosis is seen" - 


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