51-Tooth decay starts when pH value of mouth is below ……………..
(A) 5.5
(B) 6.5
(C) 7.5
(D) 8.5
52- Choose the wrong statement in following options related to pH value?
| a. pH 7 — salt of a strong acid and a strong base is neutral in nature.
b. pH less than 7—salt of a strong acid and weak base is acidic in nature. c. pH more than 7 – salt of a strong base and weak acid is basic in nature. |
(A) All options are correct
(B) Option a and b is correct
(C) Option c is correct only
(D) Option b and c is correct
53- The atmosphere of which planet is made up of thick white and yellowish clouds of sulphuric acid.
(A) Mars
(B) Venus
(C) Jupiter
(D) Sun
54- What is the role of hydrochloric acid in our stomach?
(A) It helps in the stomach to prevent from diseases
(B) It helps in the ingestion of food without breathing
(C) It helps in the digestion of food without harming the stomach
(D) None of the above
55- To get rid from the pain of acid in stomach during ingestion, we use
(A) Methonic acid
(B) Oxidants
(C) Antioxidant
(D) Antacid
56- What is the use of Magnesium hydroxide?
(A) It is used to digest the food
(B) it is used to neutralize the acid in stomach
(C) It cures the nutrients in our stomach
(D) None of the above
57- Tooth is made up of
(A) Calcium oxide
(B) Calcium phosphate
(C) calcium carbonate
(D) Calcium
58-Hardest substance in our body
(A) Brain
(B) Jaw
(C) Tooth
(D) Nails
59- ………….is used to prevent the tooth from harmful bacteria .
(A) Acid
(B) Calcium
(C) Soda
(D) Toothpaste
60- Stinging hair of nettle leaves inject ……………acid in human body.
(A) Methanoic acid
(B) Hydraulic acid
(C) Both A and B
(D) None of the above
ANSWERS:
51-(A), 52-(A), 53-(B), 54-(C),5 5-(D), 56-(B), 57-(B), 58-(C), 59-(D), 60-(A)