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NEET Test 45
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NEET Test 45
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  • Question 1/7
    4 / -1

    Which among the following conditions does not result in high RQ?

    Solutions

    Respiratory quotient RQ) is the ratio of carbon dioxide output to oxygen usage during respiration. High RQ values occur in conditions such as fat deposition, fever, muscle exercise, glycolysis etc. Low RQ is found in acidosis, alkalosis, diabetes, starvation, etc.

     

  • Question 2/7
    4 / -1

    Spinal nerves are

    Solutions

    The cranial nerves consist of all three types of nerves, i.e., motor, sensory and mixed nerves. Each spinal nerve is a mixed nerve composed of both sensory and motor neurons.

     

  • Question 3/7
    4 / -1

    Rigor mortis is

    Solutions

    Rigidity that develops in the muscle after death is termed as rigor mortis. It is due to permanent irreversible concentration, establishment of permanent link between actin and myosin and also falls in the concentration of ATP molecules.

     

  • Question 4/7
    4 / -1

    Sciatic plexus is formed by ___, ___ and ____ spinal nerves in frog.

    Solutions

    sciatic plexus is formed by 7th, 8th and 9th spinal nerves in frog.

     

  • Question 5/7
    4 / -1

    Photoelectric effect is

    Solutions

    Sir J.J. Thomson, observed that when a light of certain frequency strikes the surface of a metal, electrons are ejected from the metal. This phenomenon is known as photoelectric effect and the ejected electrons are called photoelectrons.

     

  • Question 6/7
    4 / -1

    In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam:

    Solutions

    The dissociation of NaCl in water can be represented as: 

    NaCl → Na+ + Cl- 

    H2O →H+ + OH- 

    When Pt electrode is used: 

    At cathode: 

    H+ + e- → H 

    H + H → H2 

    At anode: 

    Cl- + e-→ Cl 

    Cl + Cl → Cl2 

    When Hg is used as cathode: 

    Due to high hydrogen over voltage of Hg, Na+ ions are discharged at cathode in preference to H+ ions which gives sodium amalgam after Na dissolves in Hg.

     

  • Question 7/7
    4 / -1

    Oxidation state of chromium is +6 in

    Solutions

    Oxidation number of K = +1

    oxidation number of O = -2

    Let the oxidation number of Cr =X

    So

    +1(2) + X(2) + ─2(7) = 0

    2 + X(2) ─ 14 = 0

    ─12 + X(2) = 0

    2X = 12

    X=6 

    So the oxidation number of Cr in K2Cr2O7 is +6

     

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