Chemistry Mcqs Test Preparation for ECAT & MCAT - Set 14

1)   The process of polymerization was classified by

a. Strecker
b. Sabatier
c. Runge
d. W. H. Carothers
Answer  Explanation 

ANSWER: W. H. Carothers

Explanation:
No explanation is available for this question!


2)   All proteins yield ______ upon complete hydrolysis.

a. Nitrogen
b. Amino acids
c. Carbon and hydrogen
d. Sulphur
Answer  Explanation 

ANSWER: Amino acids

Explanation:
No explanation is available for this question!


3)   Protein attached to some non protein group is called

a. Derived protein
b. Sample protein
c. Proteoses
d. Conjugated protein
Answer  Explanation 

ANSWER: Conjugated protein

Explanation:
No explanation is available for this question!


4)   Regular coiling or zigzagging of polypeptide through hydrogen bonding is its.

a. Quantum structure
b. Secondary structure
c. Tertiary structure
d. Primary structure
Answer  Explanation 

ANSWER: Secondary structure

Explanation:
No explanation is available for this question!


5)   Orgosterol is

a. Orgocalciferol
b. Vitamin D2
c. Sterol
d. all of the above
Answer  Explanation 

ANSWER: Sterol

Explanation:
No explanation is available for this question!


6)   Lipids are soluble in

a. Organic solvents
b. Organic and inorganic solvents
c. Inorganic solvents
d. Solubility has nothing to do with lipids
Answer  Explanation 

ANSWER: Organic solvents

Explanation:
No explanation is available for this question!


7)   Animal fats are located particularly in

a. Skeleton tissues
b. Cardiac tissues
c. Connective tissues
d. Adipose tissues
Answer  Explanation 

ANSWER: Adipose tissues

Explanation:
No explanation is available for this question!


8)   Animal and vegetable fats are

a. Glycerols
b. Fatty acids
c. Triesters formed from glycerol and fatty acids
d. Tetraesters formed from glycerol and fatty acids
Answer  Explanation 

ANSWER: Triesters formed from glycerol and fatty acids

Explanation:
No explanation is available for this question!


9)   Lipopolysaccharides are examples of

a. Derived lipids
b. Simple lipids
c. Compound lipids
d. Not a type of lipids
Answer  Explanation 

ANSWER: Compound lipids

Explanation:
No explanation is available for this question!


10)   Triglycerides are easily hydrolyzed by enzymes called

a. Lyases
b. Ligases
c. Lipases
d. Hydrolases
Answer  Explanation 

ANSWER: Lipases

Explanation:
No explanation is available for this question!


11)   Saponification is the hydrolysis of fat or oil with an

a. Acid
b. Alkali
c. Enzyme and alkali
d. Enzyme and acid
Answer  Explanation 

ANSWER: Alkali

Explanation:
No explanation is available for this question!


12)   Enzynies that catalyze the transfer of groups within molecule are called

a. Isomerases
b. Lyases
c. Transferases
d. Ligases
Answer  Explanation 

ANSWER: Isomerases

Explanation:
No explanation is available for this question!


13)   Enzymes from the same organism which catalyze same reaction but are chemically and physically distinct from each other are called

a. Oxidoreductases
b. Hydrolases
c. Isoenzymes
d. Isomerases
Answer  Explanation 

ANSWER: Isoenzymes

Explanation:
No explanation is available for this question!


14)   Rate of enzymatic reaction is directly proportional to the concentration of

a. Enzyme
b. Substrate
c. Enzyme and substrate
d. Enzyme and product
Answer  Explanation 

ANSWER: Substrate

Explanation:
No explanation is available for this question!


15)   Enzyme proved useful in cancer treatment is

a. Lactic dehydrogenase
b. Alkaline phosphatase
c. L-asparaginase
d. Cellulase
Answer  Explanation 

ANSWER: L-asparaginase

Explanation:
No explanation is available for this question!


16)   Purines and pyrimidines are

a. Enzymes
b. Nitrogenous bases
c. Carbohydrates
d. Lipids
Answer  Explanation 

ANSWER: Nitrogenous bases

Explanation:
No explanation is available for this question!


17)   Nucleic acids were first demonstrated in

a. Pus cells
b. Sperm heads
c. 1872
d. all of the above
Answer  Explanation 

ANSWER: Pus cells

Explanation:
No explanation is available for this question!


18)   Nucleic acids direct the synthesis of

a. Glucose
b. Triglycerides
c. Proteins
d. All
Answer  Explanation 

ANSWER: Proteins

Explanation:
No explanation is available for this question!


19)   The mechanism by which the genetic information can be duplicated is called

a. Duplication
b. Transcription
c. Replication
d. Mutation
Answer  Explanation 

ANSWER: Replication

Explanation:
No explanation is available for this question!


20)   The nitrogenous base different in RNA as compared to DNA is

a. Cytosine
b. Thymine
c. Adenine
d. Guanine
Answer  Explanation 

ANSWER: Thymine

Explanation:
No explanation is available for this question!


21)   All the following variables are used to describle gases except

a. pressure
b. volume
c. moles
d. density
Answer  Explanation 

ANSWER: density

Explanation:
No explanation is available for this question!


22)   In the van der Waals equation (P + n2a / v2) (v - nb) = nRT which of the following statement is not true?

a. n2a/v correct for the intermolecular forces.
b. nb correct for the volume occupied by gas molecules.
c. at high densities the equation reduces to the ideal gas law
d. all of the above statements are correct.
Answer  Explanation 

ANSWER: at high densities the equation reduces to the ideal gas law

Explanation:
No explanation is available for this question!


23)   Methyl alcohol is not used as

a. a solvent
b. an anti freezing agent
c. a substitute for petrol
d. for denaturing of ethyl alcohol
Answer  Explanation 

ANSWER: a substitute for petrol

Explanation:
No explanation is available for this question!


24)   The inhaled breath of diabetics patient contain acetone. A medical student wishes to test for diabetes by asking patient to bubble their breath through a reagent.

a. alkaline aquenous iodine
b. aqueous bromine
c. Fehling solution
d. aqueous NaOH
Answer  Explanation 

ANSWER: alkaline aquenous iodine

Explanation:
No explanation is available for this question!


25)   Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse?

a. 20cm3/min
b. 40cm3/min
c. 160cm3/min
d. 2.5cm3/min
Answer  Explanation 

ANSWER: 40cm3/min

Explanation:
No explanation is available for this question!


26)   When aquious bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show?

a. phenol is unsaturated
b. 2-bromophenol is insoluble in water
c. a hydroxy group makes the benzene ring more susceptible to electrophilic attack
d. acid-base reaction
Answer  Explanation 

ANSWER: a hydroxy group makes the benzene ring more susceptible to electrophilic attack

Explanation:
No explanation is available for this question!


27)   As a substance moves from a solid to a liquid all of the following changes occur except:

a. molecules become more disordered.
b. K.E of the molecules decreases
c. intermolecular forces become weaker.
d. molecules move more frequently.
Answer  Explanation 

ANSWER: K.E of the molecules decreases

Explanation:
No explanation is available for this question!


28)   The rectified spirit is

a. 12% alcohol
b. 90% alcohol
c. 95% alcohol
d. 100% alcohol
Answer  Explanation 

ANSWER: 95% alcohol

Explanation:
No explanation is available for this question!


29)   Benzene is a good solvent for

a. fats
b. resins
c. iodine
d. all the above
Answer  Explanation 

ANSWER: all the above

Explanation:
No explanation is available for this question!


30)   Which of the following solids show anisotropy

a. Plastic
b. Glass
c. Rubber
d. None of the above
Answer  Explanation 

ANSWER: None of the above

Explanation:
No explanation is available for this question!


31)   Which of the following element doesnot show allotropy

a. Carbon
b. Arsenic
c. Nitrogen
d. Sulphur
Answer  Explanation 

ANSWER: Nitrogen

Explanation:
No explanation is available for this question!


32)   Butyl chloride gives possible isomers.

a. 2
b. 3
c. 4
d. 5
Answer  Explanation 

ANSWER: 4

Explanation:
No explanation is available for this question!


33)   Metallic crystals are soluble in

a. Polar solvent
b. Non polar solvent
c. Fused metal
d. None
Answer  Explanation 

ANSWER: Fused metal

Explanation:
No explanation is available for this question!


34)   All the transition elements show

a. Similar physical properties
b. Similar chemical properties
c. Both a and b
d. None
Answer  Explanation 

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


35)   Paramagnetic behaviour of substance is measured by a balance called

a. Analytical balance
b. Guoys balance
c. Electrical balance
d. Single beam balance
Answer  Explanation 

ANSWER: Guoys balance

Explanation:
No explanation is available for this question!


36)   In solids the temperature is the measure of

a. Average kinetic energy of molecules
b. Vibrational kinetic energy
c. Translational kinetic energy
d. None of the above
Answer  Explanation 

ANSWER: Vibrational kinetic energy

Explanation:
No explanation is available for this question!


37)   Which of the following properties prove that cathode rays are material in nature

a. they cast shadow
b. they possess momentum
c. they are negatively charged
d. all of the above
Answer  Explanation 

ANSWER: they possess momentum

Explanation:
No explanation is available for this question!


38)   Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal?

a. aluminium can be recycled
b. aluminium has very low density
c. aluminium is the most abundant metal in the earth crust
d. aluminium is resistant to corrosion by organic acids.
Answer  Explanation 

ANSWER: aluminium is resistant to corrosion by organic acids.

Explanation:
No explanation is available for this question!


39)   When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is

a. 0.33 nm
b. 0.34 nm
c. 0.35 nm
d. 0.36 nm
Answer  Explanation 

ANSWER: 0.33 nm

Explanation:
No explanation is available for this question!


40)   On heating aldehydes with Fehlings solution we get a precipitate whose colour is

a. pink
b. black
c. yellow
d. brick red
Answer  Explanation 

ANSWER: brick red

Explanation:
No explanation is available for this question!


41)   When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained.

a. 1
b. 2
c. 3
d. 4
Answer  Explanation 

ANSWER: 3

Explanation:
No explanation is available for this question!


42)   Which statement is consistent with Hunds rule.

a. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel
b. The electrons in the same atom cannot have the same four quantum numbers
c. There is maximum of two electrons is an orbital.
d. None
Answer  Explanation 

ANSWER: Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel

Explanation:
No explanation is available for this question!


43)   What is maximum number of electrons in an orbital with m (magnetic quantum number) = 3

a. 6
b. 4
c. 3
d. 2
Answer  Explanation 

ANSWER: 2

Explanation:
No explanation is available for this question!


44)   Atomic number of Mn is 25 what is the electronic configuration in the ground state

a. 1s2 2s2 2p6 3s2 3p6 3d7
b. 1s2 2s2 2p6 3s2 3p6 4s2 4p5
c. 1s2 2s2 2p6 3s2 3p5 3d10
d. 1s2 2s2 2p6 3s2 3p6 4s23d5
Answer  Explanation 

ANSWER: 1s2 2s2 2p6 3s2 3p6 4s23d5

Explanation:
No explanation is available for this question!


45)   Which of the following statement is correct

a. size of Cl atoms > Cl- ion
b. size of Na+ ion < Na atom
c. size of Na atom < Na+ ion
d. Cl- < Na+
Answer  Explanation 

ANSWER: size of Na+ ion < Na atom

Explanation:
No explanation is available for this question!


46)   Which of the following is mineral fibre.

a. teflon
b. asbestos
c. saran
d. acrylic
Answer  Explanation 

ANSWER: asbestos

Explanation:
No explanation is available for this question!


47)   Which catalyst is used in contact process?

a. Fe2O3
b. V2O5
c. SO3
d. Ag2O
Answer  Explanation 

ANSWER: V2O5

Explanation:
No explanation is available for this question!


48)   The hardest of the following solids is

a. sodium
b. diamond
c. graphite
d. magnesium
Answer  Explanation 

ANSWER: diamond

Explanation:
No explanation is available for this question!


49)   Which of the following elements has greater 1st ionization energy

a. B
b. C
c. N
d. O
Answer  Explanation 

ANSWER: N

Explanation:
No explanation is available for this question!


50)   Which of the following molecule is polar

a. CCI4
b. CO2
c. BF3
d. none of the above
Answer  Explanation 

ANSWER: none of the above

Explanation:
No explanation is available for this question!