Chemistry - MOST IMPORTANT Delhi Police Previous Year Questions
Practice real questions from previous year exams of Delhi Police.
Which natural form of vitamin B helps to prevent some of the major birth defects of the baby's brain (anencephaly) and spina bifida?
Which famous chemist refuted the theory of 'vitalism' by saying that organic substances can only be produced from living things?
Annatto seeds and extract is used as adulterant in:
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.
Which unusual flavour is observed in dairy products due to the formation of ethyl esters catalysed by esterases produced by lactic acid bacteria?
Which thermostable enzyme hydrolyses starch during the cooking of sweet potatoes?
Turmeric powder is adulterated with:
What are the compounds in food that induce the growth or activity of beneficial gut microorganisms called?
Which of the following fungus is used in fermentation technology?
Which method is used to separate ribosomes from the cell?
Which of the following is NOT true regarding the antioxidants?
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.
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?
Non-stick pans are coated with __________.
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?
It has been proved that, during a chemical reaction, atoms are neither created nor destroyed. This law is also known as the:
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.
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?
Which of the following can be used as a source of energy, when glucose is NOT available in the body?
In plants, which hormone helps the cells to grow longer?