NCERT - Health and Diseases Questions and Answers of Class 12 Biology | GkSeries

61 Which of the following specimen is tested the most for the detection of carrier of typhoid?
[1] Urine
[2] Blood
[3] Faeces
[4] Sputum
Answer: Faeces
62 Chicken pox is caused by
[1] Varicella-Zoster Herpes virus
[2] Adeno virus
[3] SV 40 virus
[4] Bacteriophage T2
Answer: Varicella-Zoster Herpes virus

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63 Which is spread by house fly
[1] Dengue fever
[2] Encephalitis
[3] Filariasis
[4] Typhoid
Answer: Typhoid
64 AZT is used in treatment of
[1] Malaria
[2] AIDS
[3] T.B.
[4] Kala-azar
Answer: AIDS
65 AIDS is characterized by sharp reduction in number of
[1] Helper T-cells
[2] Killer T-cells
[3] Suppressor T-cells
[4] B-lymphocytes
Answer: Helper T-cells
66 Small pox and rabies are caused by
[1] Bacterium
[2] Virus
[3] Protozoan
[4] Nematode
Answer: Virus
67 Pernicious anaemia is caused by the deficiency of vitamin
[1] B1/Thiamine
[2] B12/Cobalamine
[3] C/Ascorbic acid
[4] D/Calaciferol
Answer: B12/Cobalamine
68 One of the following is used for treatment of thyroid cancer
[1] U238
[2] Ra-224
[3] C-14
[4] I-131
Answer: I-131
69 Enzyme responsible for replication of HIV is
[1] RNA polymerase
[2] DNA ligase
[3] DNA polymerase
[4] Reverse transcriptase
Answer: Reverse transcriptase
70 Inactive cancer gene is called
[1] Transposon
[2] Proto-oncogene
[3] Tumour promoter gene
[4] Tumour suppressor gene
Answer: Proto-oncogene
71 Widal test is used for diagnosis of
[1] Malaria
[2] Cholera
[3] Typhoid
[4] Yellow fever
Answer: Typhoid
72 Dengue is caused by
[1] Female Aedes
[2] male Aedes
[3] Male Aneopheles
[4] Female Anopheles
Answer: Female Aedes
73 AIIDS is due to
[1] reduction in number of helper T-cells
[2] Reduction in number of killer T-cells
[3] Autoimmunity
[4] Non-production of interferons
Answer: reduction in number of helper T-cells
74 Which one of the followings is a water borne disease?
[1] Tuberculosis
[2] Malaria
[3] Cholera
[4] Chicken pox
Answer: Cholera
75 Immune deficiency syndrome could develop due to
[1] Defective liver
[2] Defective thymus
[3] AIDS virus
[4] Weak immune system
Answer: AIDS virus

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