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NEET Test 133

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NEET Test 133
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Weekly Quiz Competition
  • Question 1
    4 / -1

    What is the number of base pairs present in each pitch (pitch) of B form of DNA helix?

    Solution

    In B-DNA, the most common double-helical structure found in nature, the double helix is right-handed with about 10-10.5 base pairs per turn. The double helix structure of DNA contains a major groove and minor groove.

     

  • Question 2
    4 / -1

    Chemical A is used for water softening to remove temporary hardness, A reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. What is the chemical formula of A?

    Solution

    The chemical A is calcium hydroxide (Ca(OH)2). It is used for water softening to remove temporary hardness. It reacts with sodium carbonate to form caustic soda.

    Na2CO3 + Ca(OH)2 → CaCO3↓+NaOH

    With carbon dioxide gas, it forms calcium carbonate which turns lime water milky.

    Ca(OH)2+CO2→CaCO3↓+H2O

     

  • Question 3
    4 / -1

    If a coil of 40 turns and area 4.0cm2 is suddenly removed from a magnetic field, it is observed that a charge of 2.0 × 10−4C flows into the coil. If the resistance of the coil is 80Ω, the magnetic flux density in Wb/m2 is:

    Solution

     

  • Question 4
    4 / -1

    The correct order of acidic behaviors of the following oxoacids is:

    1. Hypochlorous acid

    2. Chlorous acid

    3. Chloric acid

    4. Perchloric acid

    Solution

    Oxygen is more electronegative than chlorine. With an increase in the number of O atoms attached to Cl, more electrons are pulled away from O - H bond and more weaker becomes the O - H bond. This increases the acid strength.

    The decreasing order of acidic strength is

    HClO4 > HClO3 > HClO2 > HClO.

     

  • Question 5
    4 / -1

    Transcription refers to:

    Solution

    Transcription is one of the processes of protein synthesis where mRNA is synthesized from DNA. In this process adenine pairs with uracil as RNA has uracil instead of thymine.

    DNA contains the genetic information of an individual organism which is transferred to the newly synthesized mRNA as it contains the cistron. Gene that codes for a particular protein or enzyme is also called a cistron. It forms the largest element in the gene that encodes for a polypeptide gene. mRNA can be monocistronic or polycistronic.

     

  • Question 6
    4 / -1

    A metal surface of work function 1.07eV is irradiated with light of wavelength 332nm. The retarding potential required to stop the escape of photoelectrons is :

    Solution

    Retarding potential,

     

     

  • Question 7
    4 / -1

    Consider a tightly wound 100 turn coil of radius 10 cm, carrying a current of 1 A. What is the magnitude of the magnetic field at the centre of the coil?

    Solution

    Since, the coil is tightly wound, we may take each circular element to have the same radius.

    R =10 cm

    = 0.1 m

    The number of turns N =100.

    The magnitude of the magnetic field is,

     

  • Question 8
    4 / -1

    The mass of a planet is  that of earth and its diameter is half that of earth, the acceleration due to gravity is

    Solution

     

  • Question 9
    4 / -1

    The subunits of the protein coat of a virus determine its:

    Solution

    The protein coat of a virus called capsid is made of small subunits called capsomeres, which protect the nucleic acid. These capsomeres are arranged in helical or polyhedral geometric forms.

     

  • Question 10
    4 / -1

    The ionic mobility of alkali metal ions in aqueous solution is maximum for:

    Solution

     

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