To reduce tooth decay most toothpastes contain a

Question To reduce tooth decay most toothpastes contain a

A) Bromide
B) Fluoride
C) Iodide
D) Chloride

Answer: Fluoride

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The gas that causes suffocation and death when coal or coke is burnt in close room is

Question 194 The gas that causes suffocation and death when coal or coke is burnt in close room is

A) carbon monoxide
B) carbon dioxide
C) methane
D) ethane

Answer: carbon monoxide

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Antacids are commonly used to get rid of acidity in the stomach. A commonly used antacid is

Question 44 Antacids are commonly used to get rid of acidity in the stomach. A commonly used antacid is

A) sodium hydrogen phthalate
B) magnesium hydroxide
C) calcium hydroxide
D) manganese Acetate

Answer: magnesium hydroxide

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Iodized salt is a

Question 43 Iodized salt is a

A) mixture of potassium iodide and common salt
B) mixture of molecular iodine and common salt
C) compount formed by combination of potassium iodide and common salt
D) compound formed by molecular iodine and common salt

Answer: mixture of potassium iodide and common salt

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The gas which turns limewater milky is

Question 21 The gas which turns limewater milky is

A) carbon dioxide
B) carbon monoxide
C) ammonia
D) nitrogen dioxide

Answer: carbon dioxide

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On the labels of the bottles, some soft drinks are claimed to be acidity regulators. They regulate acidity using

Question 21 On the labels of the bottles, some soft drinks are claimed to be acidity regulators. They regulate acidity using

A) carbon dioxide
B) bicarbonate salts
C) both carbon dioxide and bicarbonate salts
D) carbon dioxide and lime

Answer: bicarbonate salts

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Fruits stored in a cold chamber exhibit longer storage life because

Question 86 Fruits stored in a cold chamber exhibit longer storage life because

A) exposure to sunlight is prevented
B) concentration of carbon dioxide in the environment is incresed
C) rate of respiration is decreased
D) there is an increase in humidity

Answer: rate of respiration is decreased

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Which one of the following is not a Green House Gas?

Question 55 Which one of the following is not a Green House Gas?

A) Water vapours
B) Methane
C) Ozone
D) Carbon Monoxide

Answer: Carbon Monoxide

Explanation: The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone.

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Muscle fatigue is due to accumulation of

Question 56 Muscle fatigue is due to accumulation of:

A) Cholesterol
B) Lactic acid
C) Lipoic acid
D) Triglycerides

Answer: Lactic acid

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mixture of CO and H2 is

Question 61 Consider the following reaction:
CH4(g) + H2O(g) ------>(1270 K)   ---> CO(g) + 3H2(g)

In the reaction given above, the mixture of CO and H2 is:

A) natural gas
B) water gas
C) producer gas
D) industrial gas

Answer: water gas

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Addition of gypsum to cement

Question 65 Addition of gypsum to cement

A) reduces setting time of cement
B) produces very light colour cement
C) increase setting time of cement
D) shining surface is formed

Answer:  increase setting time of cement

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Boric acid is an acid because its molecule

Question 72 Boric acid is an acid because its molecule:

A) accepts OH negative ion from water releasing proton
B) Combines with proton from water
C) containes replaceable H positive ion
D) gives up a proton

Answer: accepts OH negative ion from water releasing proton

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Explanation by reaction :
B(OH)₃ + H₂O  B(OH)−
4 + H⁺

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Which of the following statements regarding heavy water are correct?

Question 95 Which of the following statements regarding heavy water are correct?

1. It is extensively used as a moderator in nuclear reactors
2. It cannot be used in exchange reaction to study reaction mechanism
3. Viscosity of heavy water is relatively smaller than that of ordinary water
4. The dielectric constant of heavy water is smaller than that of ordinary water
Select the correct answer using the code given below:
A) 1 and 2
B) 2 and 3
C) 3 and 4
D) 1 and 4

Answer: 1 and 4

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To weld metals together, high temperature is required. Such a high temperature is obtained by burning

Question 98 To weld metals together, high temperature is required. Such a high temperature is obtained by burning:

A) Acetylene in oxygen
B) LPG in oxygen
C) Methane in oxygen
D) Acetylene in nitrogen

Answer: Acetylene in oxygen

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symbol of the element Tungsten

Question 112 The symbol of the element 'Tungsten' is:

A) Ta
B) W
C) Tl
D) Tc

Answer: W

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alkali metal having highest melting point

Question 117 The alkali metals have relatively low melting point. Which one of the following alkali metals is expected to have the highest melting point?
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B) Na
C) K
D) Rb
Answer: Li (Lithium)

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Which one among the following is used in making gun powder?

NDA NA Exam I 2015 Questions

Question 72 Which one among the following is used in making gun powder?

A) Magnesium sulphate
B) Potassium nitrate
C) Sodium stearate
D) Calcium sulphate

Answer: Potassium nitrate

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The cleansing action of soap and detergent is due to the formation of

NDA NA Exam I 2015 Questions

Question 73 The cleansing action of soap and detergent is due to the formation of

A) Micelle
B) Salt
C) Base
D) Acid

Answer: Micelle

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The chemical used as a fixer / developer in photography is

NDA NA Exam I 2015 Questions

Question 74 The chemical used as a fixer / developer in photography is

A) sodium sulphate
B) Sodium sulphide
C) Sodium thiosulphate
D) Sodium sulphite

Answer: Sodium thiosulphate

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Why is graphite used in electrolytic cells?

NDA NA Exam I 2015 Questions

Question 83 Why is graphite used in electrolytic cells?

A) Graphite is soft and can be easily moulded into electrodes
B) Graphite is made of layers of carbon atoms which can slide
C) Graphite is inert to most of the chemicals and remains intact in electrolytic cells
D) Graphite is a good conductor of electricity

Answer: Graphite is inert to most of the chemicals and remains intact in electrolytic cells

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