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Quiz 82
Mdcat-past-papers - UHS Quiz
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Board: UHS |
1621. According to Lamarck, the evolution of long necks in giraffes is explained by:
Natural selection
Genetic mutation
Survival of the fittest
Stretching of necks over generations
1622. The process of spermatogenesis occurs in which part of the male reproductive system?
Seminiferous tubules
Vas deferens
Scrotum
Epididymis
1623. Which layer of uterus nourishes the embryo after implantation?
Cervical epithelium
Myometrium
Endometrium
Perimetrium
1624. The main role of mRNA during protein synthesis is to:
Carry genetic information for protein synthesis
stabilize ribosome
deliver amino acids
provide platform for proteins synthesis
1625. Glycoproteins are formed as a result of the combination of:
Lipids and proteins
Carbohydrates and proteins
Nucleic acid and proteins
Fatty acids and carbohydrates
1626. A student observed a boundary in both plant and animal cells that controls entry and exit of substances. Which of the following structures is likely being observed?
Mitochondria
Golgi apparatus
Plasma membrane
Cell wall
1627. If a normal person marries with colour blind female what will be the possibility of normal male child:
0%
25%
50%
75%
1628. Which of the following characters is shared by both skeletal and cardiac muscles?
Presence of Striation
Involuntary control
Multinucleated fibers
Intercalated discs
1629. Which of the following muscle types are involuntary in action?
Skeletal and smooth
Skeletal and cardiac
Cardiac and smooth
Smooth muscle only
1630. In which of the following combinations, both components have non-striated muscle fibers?
Intestine & biceps
Intestine & blood vessels
Heart & lungs
Stomach & heart
1631. Value of R gas constant in J mol^−1 K^−1.
8.314
62.4
0.821
62400
1632. Which of the following best explains why phenol reacts with aqueous NaOH, but alcohols do not?
Phenol has a lower boiling point than alcohol.
Alcohols contain a strong O-H bond that cannot be broken by weak bases.
Phenol form hydrogen bonding that facilitates ionization.
Phenol is weakly acidic due to resonance stabilization of phenoxide ion.
1633. In propene pi-bond is formed by sideway overlap of:
s-orbitals
p-orbitals
sp^3 hybrid orbitals
sp^2 hybrid orbitals
1634. An enzyme used to decompose the lipids into fatty acids in our alimentary canal is:
Amylase
Protease
Lipase
Urease
1635. Molecules having one lone pair and three bond pairs have geometrical shape :
Bent or angular
Trigonal
Trigonal pyramidal
Trigonal planner
1636. Conversion of dihaloalkane into alkyne does not involve:
Addition
Elimination
Base
Heat
1637. Majority of reactions taking place at ordinary temperatures with negative delta H are :
Endothermic
Exothermic
Thermally unstable
Reversible
1638. Which one of the following is a coinage metal :
Pd
Cu
Cd
Hg
1639. Consider the given balanced chemical equation: 2H2 + O2 = 2H2O. If 4 g of H2 reacts with 32 g of O2 to produce 28 g of H2O, what is the percentage yield of the reaction? (Molar mass of H2 = 2 g/mol, O2 = 32 g/mol and H2O = 18 g/mol)
63.6%
77.8%
87.5%
92.5%
1640. Amount of energy needed to weaken the existing bonds to an extent that can be broken through collision is called:
Bond energy
Activation energy
Average energy
Enthalpy
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