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KVPY (SA) Mock Test - 3

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KVPY (SA) Mock Test - 3
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Weekly Quiz Competition
  • Question 1
    1 / -0

    'A' can construct a wall in 30 days, whereas 'B' can construct or destroy the same wall in the same time i.e destroy time is equal to construct time. If 'A' constructs and 'B' destroys, it takes 60 days to construct the wall. How many days will it take to construct the wall, if both 'A' and 'B' work towards constructing the wall?

    Solution

    Let us assume that 'B' can destroy the wall in 'd' days.

    1/30 – 1/d = 1/60

    ⇒ d = 60 days

    So, if both 'A' and 'B' work to construct the wall,

    In 1 day, they can do 1/30 + 1/60 = 1/20
    So, it takes 20 days to construct the wall, if both 'A' and 'B' work towards constructing the wall.

     

  • Question 2
    1 / -0

    Rohan sleeps at 10 pm and wakes up at 7 am. He bathes from 7 am to 8 am. He plays from 8 am to 10 am and again from 5 pm to 8 pm. He takes his dinner from 8 pm to 9 pm and watches TV from 9 pm to 10 pm and he studies the rest of the time. Which of the following represents his study time in fractions?

    Solution

    Rohan sleeps for 9 hours;
    bathes for 1 hour;
    plays for 5 hours;
    has dinner for 1 hour;
    watches TV for 1 hour;
    So, the rest of the time that is for studying = 24 – (9 + 1 + 5 + 1 + 1) = 7 hours
    So, the fraction for his study time = 7/24.

     

  • Question 3
    1 / -0

    We are able to squeeze snow and make balls out of it because of

    Solution

    We are able to squeeze snow and make balls out of it due to water's unusual behaviour.

    Hence, answer is anomalous behaviour of water.

     

  • Question 4
    1 / -0

    An electric heater consists of a nichrome coil and runs under 220 V, consuming 1 kW power. Part of its coil burns out and it is reconnected after cutting off the burnt portion. The power it will consume now is

    Solution

    We know, P = (V2/R)
    From the question, voltage remains constant and some part of wire is removed after burn.
    So, P is inversely proportional to R.
    As resistance decreases due to removing of wire, power increases.
    So, power consumption will be more than 1 kW.

     

  • Question 5
    1 / -0

    When a fuse is rated 8 A, it means it

    Solution

    A fuse protects a circuit from excess current. It will melt if the current exceeds 8 A.

     

  • Question 6
    1 / -0

    A symmetric double convex lens is cut into two equal parts by a plane perpendicular to the principal axis. If the power of original lens is 4D, the power of a cut lens will be

    Solution

    Power of lens is divided when a symmetric double convex lens is cut into two equal parts by a plane perpendicular to the principal axis. So, power of a cut lens = 4D/2 = 2D

     

  • Question 7
    1 / -0

    A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque, then

    Solution

    A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque, then the image will be formed with reduced brightness as light reaching from each and every part of the object through lens, with blackened part, will be less as the aperture of the lens is reduced.

     

  • Question 8
    1 / -0

    The molecular formula of marsh gas is ________.

    Solution

    The molecular formula of marsh gas is: CH4.

     

  • Question 9
    1 / -0

    The correct order of increasing basic nature for bases NH3, CH3NH2, (CH3)2 NH is

    Solution

    Basic character of amines increases with increase in the electron density on the nitrogen atom.

     

  • Question 10
    1 / -0

    The type of hybridisation in CH2 = CH2 is

    Solution

    Both carbon atoms in ethylene are sp2 hybridised.

     

  • Question 11
    1 / -0

    From the ground state of electronic configuration of various electrons, which will have the highest second ionisation energy?

    Solution

    The removal of second electron will be from completely filled p-orbital, so it will need the highest energy.

     

  • Question 12
    1 / -0

    Two isotonic nuclides X and Y have mass numbers 35 and 37 respectively. If the atomic number of X is 17, the atomic number of Y will be _______.

    Solution

    Nuclides having the same number of neutrons, but different number of protons are said to be isotonic.
    Mass number = number of protons + number of netrons.
    X (mass number) = 35 and atomic number i.e number of protons is = 17
    Number of neutrons in X = 35 - 17 = 18
    Since the number of neutrons in X = number of neutrons in Y = 18
    Mass number of Y = 37
    Atomic number = mass number - number of neutrons = 37 - 18 = 19
    Atomic number of Y is 19.

     

  • Question 13
    1 / -0

    Which of the following is a polar compound?

    Solution

    Because of large electronegativity difference between hydrogen and chlorine, the H-Cl bond is a polar bond and HCl is a polar molecule.

     

  • Question 14
    1 / -0

    The helical structure of proteins is stabilized by

    Solution

    An alpha helix is secondary structure of proteins. The stability of such structures is primarily provided by hydrogen bonding between 'hydrogen' of amino group of amino acid and 'oxygen' of carbonyl group of another amino acid.

     

  • Question 15
    1 / -0

    A solution is highly acidic in nature and a small quantity of a weakly basic solution is added to it. What will be the chemical nature of the resulting solution?

    Solution

    When a highly acidic solution is mixed with a small quantity of a weakly basic solution, the hydroxide (OH-) ions from the base will combine with the H+ ions of acid and neutralise it. However, the number of OH- ions per unit volume in a weak base will be very less as compared to that of H+ ions in a strong acid. Therefore, the neutralisation will not be complete and the resultant solution will remain acidic.

     

  • Question 16
    1 / -0

    In which of the following compounds does nitrogen have an oxidation state of − 1?

    Solution

    Nitrogen has an oxidation state of + 1 in N2O.
    Nitrogen has an oxidation state of + 3 in NO2-.
    Nitrogen has an oxidation state of − 1 in NH2OH.
    Nitrogen has an oxidation state of − 2 in N2H4.

     

  • Question 17
    1 / -0

    Non-metals are poor conductors of electricity because of the absence of

    Solution

    A non-metal atom has 4, 5, 6, 7 or 8 electrons in its valence shell. These electrons are not free. That is why non-metals do not conduct electric current. Protons and neutrons, which are present in the nucleus of every atom, have no role in the conduction of electricity.

     

  • Question 18
    1 / -0

    Which of the following compounds is not a hydrocarbon?

    Solution

    Phenol is not a hydrocarbon, it is C6H5OH. Hydrocarbons are compounds containing only carbon and hydrogen.

     

  • Question 19
    1 / -0

    Which of the following word equations is incorrect?

    Solution

    Iron is less reactive than zinc. So, it will not be able to displace zinc from zinc sulphate.

     

  • Question 20
    1 / -0

    Vitamin excreted by urine in higher vertebrates is

    Solution

    Vitamin C is water soluble vitamin. Other options are fat soluble vitamins. So, vitamin C is excreted in urine.

     

  • Question 21
    1 / -0

    Which of the following is related to the central nervous system?

    Solution

    The central nervous system (CNS) is the part of the nervous system consisting of the brain and spinal cord

     

  • Question 22
    1 / -0

    Identify the group among the following, which contains all the viral diseases.

    Solution

    Influenza, mumps and dengue fever are caused by viruses.

     

  • Question 23
    1 / -0

    If tall height (TT) is a dominant trait and short height is a recessive trait (tt) in the garden pea, then which of the following statements is true?

    Solution

    (T) is dominant, while (t) is recessive. It means that when (T) and (t) are present together, the effect of (T) will hide the effect of (t). But in the absence of (T), the effect of (t) will be visible. Thus, (TT) are tall, while (tt) are short. But in (Tt), the tall feature dominates short-height trait.

     

  • Question 24
    1 / -0

    Fucus, an alga has which of the following types of life cycle?

    Solution

    Fucus, an alga is diplontic.

     

  • Question 25
    1 / -0

    Bidder's canal is found in

    Solution

    Bidder's canal is found in kidney of frog.

     

  • Question 26
    1 / -0

    Klinefelter's syndrome in humans is an archetype of chromosomal aneuploidy. It is diagnosed by

    Solution

    A karyotype is used to show the number, types and appearance of chromosomes. Therefore, an extra X chromosome in a Klinefelter's person could be readily diagnosed by karyotyping.

     

  • Question 27
    1 / -0

    At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

    Solution

    G2 phase is a period of rapid cell growth and protein synthesis during which the cell readies itself for mitosis. So, during G–2 stage of interphase histone proteins synthesized in a eukaryotic cell.

     

  • Question 28
    1 / -0

    Which of the following cell types is considered as cell fragment and not a complete cell?

    Solution

    Platelets are irregular cell fragments that occur in blood. They are derived from fragmentation of large megacaryocytes.

     

  • Question 29
    1 / -0

    In meiosis, germ cells will undergo two successive divisions in which

    Solution

    Meiosis comprises two successive nuclear divisions with only one round of DNA replication produce four haploid cells.

     

  • Question 30
    1 / -0

    The enzymes which differ slightly in structure, but can catalyze the same type of reaction, are known as

    Solution

    These enzymes may differ in amino acid sequence, but catalyse the same type of reaction.

     

  • Question 31
    1 / -0

    Where do endocrine glands release their secretions?

    Solution

    Endocrine glands release their secretions directly into the blood stream. They let out the produced hormones by way of the blood vessels supplying the glands.

     

  • Question 32
    1 / -0

    Which of the following is the feature of skeletal muscle fibres?

    Solution

    Skeletal muscle fibres are cylindrical shaped with blunt ends. They have characteristic dark and light bands which give them a striated appearance. They are multinucleated and have numerous mitochondria as they have to produce a lot of energy.

     

  • Question 33
    1 / -0

    Sacculated, fusiform or cylindrical forms are the main forms of which of the following diseases?

    Solution

    Aneurysm is caused due to circumscribed dilation of an artery.

     

  • Question 34
    1 / -0

    How many stereoisomers is shown by a glucose molecule having 4-asymmetric carbonation?

    Solution

    24 = 16 stereoisomers are possible for glucose molecule.

     

  • Question 35
    1 / -0

    Portuguese man o' war or physalia is a

    Solution

    Portuguese man o' war or physalia is a polymorphic coelentrate.

     

  • Question 36
    1 / -0

    In a cross between red-eyed female dragonfly and a white-eyed male dragonfly what percent of the male progenies will have white eyes? (White eyes are X-linked recessive)

    Solution

    The pure breed female is homozygous with the normal X chromosome and the white-eyed male is hemizygous for the X chromosome with a white eye mutation. Therefore, all male and female progenies are red-eyed.

     

  • Question 37
    1 / -0

    Mechanical support, enzyme circulation and protein synthesis are the main functions of

    Solution

    All listed functions are concerned with ER.

     

  • Question 38
    1 / -0

    According to widely accepted "fluid mosaic model" cell membranes are semi–fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect?

    Solution

    Most large proteins do not flip-flop due to their extensive polar regions, which are unfavorable in the hydrophobic core of a membrane bilayer. This allows the asymmetry of membranes to be retained for long periods, which is an important aspect of cell regulation.

     

  • Question 39
    1 / -0

    Organisation of stem apex into corpus and tunica is determined mainly by

    Solution

    The tunica corpus concept was given by Schmidt (1924) which was based on plane of divisions of cells. According to this concept there are two portions in shoot apex : tunica and corpus. The tunica shows only anticlinical divisions and thus it is responsible for surface growth. The corpus shows divisions in all plane and thus responsible for volume growth.

     

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