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NEET Test 153

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NEET Test 153
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Weekly Quiz Competition
  • Question 1
    4 / -1

    In sickle cell anemia due to point mutation, the sixth amino acid, glutamic acid in beta chain of hemoglobin is replaced by

    Solution

    In sickle cell anaemia due to point mutation, the sixth amino acid, glutamic acid in the beta chain of haemoglobin is replaced by valine. Sickle cell anaemia results in an abnormality in the oxygen-carrying protein haemoglobin found in red blood cells.

    Sickle cell disease occurs when a person inherits two abnormal copies of the haemoglobin gene, one from each parent.

     

  • Question 2
    4 / -1

    By which of the following reagents, butanoic acid can be converted into butane?

    Solution

    Butanoic acid can be converted to butane by heating with hydriodic acid (HI) and red phosphorus (Red P).

     

     

  • Question 3
    4 / -1

    To reduce the de Broglie wavelength of an electron from 100 𝑝𝑚 to 50 𝑝𝑚, the required increase in energy will be:

    Solution

     

  • Question 4
    4 / -1

    The oxidation number of sulphur in H2S2O8 is:

    Solution

    The structure of  H2S2O8 is given below.

    In the structure of H2S2O8, two oxygen atoms are involved in peroxide linkage, 

    So, the oxidation number will be -1 (each). 

    The remaining oxygen atoms will have a -2 charge. 

    Thus, we can calculate the oxidation state of sulphur (x) as follows:

    x = +6

     

  • Question 5
    4 / -1

    Match columns I and II, and choose the correct combination from the options given:

    Column I Column II
    (a) Selaginella (i) Psilopsida
    (b) Equisetum (ii) Lycopsida
    (c) Adiantum (iii) Sphenopasida
    (d) Dryopteris (iv) Pteropasida
    Solution

    Pteridophytes are seedless vascular plants that reproduce by means of spores and they are first land plants also. Pteridophyta is further divided into four classes i.e. Psilopsida, Lycopsida, Sphenopsida, and Pteropsida.

    Selaginella belongs to Lycopsida and there is a ligule present at the base of each sporophyll and microsporophyll.

    Equisetum belongs to Sphenopsida and it is a living fossil. This plant is also known by another name i.e., horsetail.

    Adiantum, Dryopteris and Pteris belong to Pteropsida and they have large dissected leaves

    Psilotum belongs to Psilopsida and is characterized by the absence of roots and the presence of rhizoids.

     

  • Question 6
    4 / -1

    Homologous repeats are involved in which of the following types of mutation?

    Solution

    A deletion changes the number of DNA bases by removing a piece of DNA. Small deletions may remove one or a few base pairs within a gene, while larger deletions can remove an entire gene or several neighboring genes. This type of mutation occurs when the addition or loss of DNA bases changes a gene's reading frame.

     

  • Question 7
    4 / -1

    In a particular system, the unit of length, mass and time are chosen to be 10 cm,10 g and 0.1 s respectively. The unit of force in this system will be equivalent to -

    Solution

     

  • Question 8
    4 / -1

    A resistor of 200Ω and a capacitor of 15.0𝜇F are connected in series to a 220 V,50 Hz ac source. Calculate the current in the circuit;

    Solution

    In order to calculate the current, we need the impedance of the circuit. It is:

     

  • Question 9
    4 / -1

    Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, the number of atoms of nitrogen in one molecule of caffeine is:

    Solution

    Given:

    Molecular weight of caffeine = 194𝑔

    Mass percent of nitrogen = 28.9%

    Atomic weight of nitrogen = 14𝑔

    Thus, mass of nitrogen element in one mole of caffeine = 28.9% of 194𝑔

    Number of nitrogen atoms in caffeine can be calculated by dividing the mass of nitrogen in a molecule of caffeine with the atomic mass of nitrogen.

    As we know,

    Number of atoms of any element = 

    Number of nitrogen atoms in one molecule of caffeine 

    = 4

     

  • Question 10
    4 / -1

    Consider the separate solution of 0.500MC2H5OH(aq),0.100MMg3(PO4)2(aq), 0.250MKBr(aq) and 0.125MNa3PO4(aq) at 25∘C. Which statement is true about these solutions, assuming all salts to be strong electrolytes?

    Solution

     

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