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Q:

Among the given nutrients, milk is a poor source of

A) Calcium B) Protein
C) Vitamin C D) Carbohydrates

Answer:   C) Vitamin C



Explanation:
Subject: Chemistry
Q:

The crop that has the highest photosynthetic activity -

A) Sugarcane B) Wheat
C) Cotton D) Rice
 
Answer & Explanation Answer: A) Sugarcane

Explanation:

Corn, sugar cane, and sorghum are C4 plants. These plants are economically important in part because of their relatively high photosynthetic efficiencies compared to many other crops.

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7 183
Q:

Steel contains

A) no carbon B) < 2% of carbon
C) > 10% of carbon D) > 29% of carbon
 
Answer & Explanation Answer: B) < 2% of carbon

Explanation:

To make steel, iron ore is first mined from the ground. It is then smelted in blast furnaces where the impurities are removed and carbon is added.

In simple, steel is iron alloyed with carbon, usually 0 - 2%.

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7 259
Q:

Which is the only gem of world made of a single element?

A) Platinum B) Diamond
C) Emerald D) Ruby
 
Answer & Explanation Answer: B) Diamond

Explanation:

The only gem of world made of a single element is Diamond.

the_only_gem_of_world_made_of_a_single_element1563602197.jpg image

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3 168
Q:

Which of the following is also known as Carbolic Acid?

A) Hydroxide B) Sulphuric Acid
C) Ethanol D) Phenol
 
Answer & Explanation Answer: D) Phenol

Explanation:

Phenol with a molecular formula [C6H5OH] is also called as Carbolic Acid. It is a white poisonous clear compound with sweet smell. It is used in making plastics, detergents and drugs.

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7 214
Q:

Which compound matches the IR Spectrum?

Which_compound_matches_the_IR_Spectrum11562648897.png image

A) 3 – Hexanol B) Trans – 4 – Octene
C) 1, 5 – Hexadiene D) None of the above
 
Answer & Explanation Answer: C) 1, 5 – Hexadiene

Explanation:

Infrared spectroscopy involves the interaction of infrared radiation with matter. It is used by chemists to determine functional groups in molecules. IR Spectroscopy measures the vibrations of atoms, and based on this it is possible to determine the functional groups.

Here in the given spectrum, there is no alcohol stretch present in the spectrum. There is no vinyl bending present in the spectrum.
 

Hence, both options B and C are compounds that are not matching with IR spectrum. 1, 5 – Hexadiene is the compound matches the IR Spectrum.

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0 215
Q:

1 Mole of CO2 mass is

A) 32 gms B) 44 gms
C) 16 gms D) 12 gms
 
Answer & Explanation Answer: B) 44 gms

Explanation:

We know that,

Mass of Carbon = 12 gms

Mass of Oxygen = 16 gms = O2 => 16 * 2 = 32 gms

=> Mass of 1 mole of CO2 = 12 + 32 = 44 gms.

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3 322
Q:

Which of the following is not a subatomic particle?

A) neutron B) ion
C) electron D) proton
 
Answer & Explanation Answer: B) ion

Explanation:

The particles which makes upon an atom are called subatomic particles. Electrons, protons and Neutrons that makes an atom are called subatomic particles.

Whereas,

An ion is an atom or group of atoms in which the number of electrons is different from the number of protons.

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6 282
Q:

Coagulation during water treatment is designed to remove

A) Sand and gravel B) Bad smells
C) Pathogenic microorganisms D) Particles suspended in water
 
Answer & Explanation Answer: D) Particles suspended in water

Explanation:

Coagulation is a chemical process that involves neutralization of charge. Coagulation during water treatment is designed to remove particles suspended in water.

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