Chemistry - MOST IMPORTANT Delhi Police Previous Year Questions
Practice real questions from previous year exams of Delhi Police.
📘 Chemistry in Everyday Life📚 Misc
Q1
Which natural form of vitamin B helps to prevent some of the major birth defects of the baby's brain (anencephaly) and spina bifida?
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📘 Organic Chemistry📚 Misc
Q2
Which famous chemist refuted the theory of 'vitalism' by saying that organic substances can only be produced from living things?
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📘 Chemistry in Everyday Life📚 Misc
Q3
Annatto seeds and extract is used as adulterant in:
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📘 Chemistry in Everyday Life📚 Misc
Q4
Match the columns. Food material: i. Starch, ii. Fat, iii. Protein, iv. Halogenoalkane salt. Chemical/reagent/test used for detection: a. Acrolein test, b. Biuret test, c. Iodine, d. Silver nitrate.
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📘 Organic Chemistry📚 Ester and Formaldehyde
Q5
Which unusual flavour is observed in dairy products due to the formation of ethyl esters catalysed by esterases produced by lactic acid bacteria?
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📘 Catalyst📚 General Facts and Properties
Q6
Which thermostable enzyme hydrolyses starch during the cooking of sweet potatoes?
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📘 Chemistry in Everyday Life📚 Misc
Q7
Turmeric powder is adulterated with:
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📘 Chemistry in Everyday Life📚 Misc
Q8
What are the compounds in food that induce the growth or activity of beneficial gut microorganisms called?
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📘 Chemistry in Everyday Life📚 Misc
Q9
Which of the following fungus is used in fermentation technology?
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📘 Separation of Mixtures📚 Centrifugation
Q10
Which method is used to separate ribosomes from the cell?
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📘 Chemistry in Everyday Life📚 Misc
Q11
Which of the following is NOT true regarding the antioxidants?
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📘 Phase Changing Processes and Their Factors📚 Sublimation
Q12
Consider the following statements and select the correct option.
A: All the objects must change from solids into liquids before changing into gases.
B: Evaporation is the process by which solids can change into gases.
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📘 Acids, Bases and Salts📚 Chemical Properties of Acids
Q13
Hydrogen ions cannot exist alone, but they exist after combining with water molecules. Which of the following is the correct way to show hydrogen ions?
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📘 Polymer📚 Teflon
Q14
Non-stick pans are coated with __________.
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📘 Chemistry in Everyday Life📚 Misc
Q15
In food processing, which miscellaneous constituent obtained from the maize plant is mixed with water or juice and boiled to form fillings and give products a glossy semi-clear finish?
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📘 Laws of Chemical Combinations📚 Laws of Conservation of Mass
Q16
It has been proved that, during a chemical reaction, atoms are neither created nor destroyed. This law is also known as the:
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📘 Chemical Reactions📚 Photochemical Reaction
Q17
Select the correct sequence of the following steps during the process of photosynthesis.
i. Chlorophyll helps in absorbing light energy.
ii. Light energy is converted into chemical energy and the water molecule is split into oxygen and hydrogen molecules.
iii. Carbon dioxide is converted into carbohydrates.
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📘 Environmental Chemistry📚 Misc
Q18
What process was discovered in the early 1990s that is currently used to remove ammonia from wastewater and contributes significantly to the loss of fixed nitrogen from the oceans?
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📘 Chemistry in Everyday Life📚 Misc
Q19
Which of the following can be used as a source of energy, when glucose is NOT available in the body?
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📘 Chemistry in Everyday Life📚 Misc
Q20
In plants, which hormone helps the cells to grow longer?
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