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NSO - Mock Test - 4

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NSO - Mock Test - 4
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  • Question 1
    1.2 / -0
    Find the missing number in the following series.

    5, 8, 17, 44, 125, ?
    Solution
    The series is going up in powers of 3.
    5 + 31 = 8
    8 + 32 = 17
    17 + 33 = 44
    44 + 34 = 125
    125 + 35 = 368
  • Question 2
    1.2 / -0
    A person is walking towards opposite of north. After walking for 20 m he turns to the opposite of his left and walks 25 m more. After that he turns to his right and again walks 20 m. Finally he turns to his right and continues walking. Towards which side is he walking now?
    Solution
    Opposite of north is south and opposite of left is right.
    S= Start pointing of the person
    P = Present location of the person

  • Question 3
    1.2 / -0
    In a certain code, "BRAKE" is coded as "DUEPK". How is "ACTOR" coded in that code?
    Solution
    BRAKE is coded as DUEPK as follow:-
    B + 2 = D
    R + 3 = U
    A + 4 = E
    K + 5 = P
    E + 6 = K

    In the same way ACTOR will be coded as CFXTX as follow:
    A + 2 = C
    C + 3 = F
    T + 4 = X
    O + 5 = T
    R + 6 = X
  • Question 4
    1.2 / -0
    A is father of B, D is daughter of I. H is maternal uncle of D. If A and I are husband-wife, then which of the following is definitely true?
    Solution
  • Question 5
    1.2 / -0
    Complete the following analogy.

    KIFG : ODJB :: HRTN : ?
    Solution
    The relation between KIFG and ODJB is as follow:-
    K + 4 = O
    I - 5 = D
    F + 4 = J
    G - 5 = B

    So the missing term will be LMXI as follow:-
    H + 4 = L
    R - 5 = M
    T + 4 = X
    N - 5 = I
  • Question 6
    1.2 / -0
    Find the mirror image of the following.

    Solution
    The mirror image is as follow:-

  • Question 7
    1.2 / -0
    Find the missing part of the following figure.

    Solution
    The whole image is as follow:-

  • Question 8
    1.2 / -0
    What is the minimum number of lines which can be used to make the following figure?
    Solution

    Minimum number of lines which can be used to make the given figure = 7
    AB, CD, DG, AD, CE, BF, DG and AG
  • Question 9
    1.2 / -0
    Find the figure from the following options, which satisfies the same conditions of placement of the dots as given in figure A.

    Solution
    In figure A, one of the dots lies in the area common to the circle and the square and the other dot lies in the area common to the square and the pentagon. In option (1) and (2) figure there is no area which is common between square and the pentagon only and in option (3) figure there is no area which is common between the square and the pentagon. In option (4) there is area which is common between the circle and the square and the square and the pentagon.

  • Question 10
    1.2 / -0
    Find the water image of the following.

    Solution
    The water image is as follow:-

  • Question 11
    1.2 / -0
    In which of the following motion, every particle of the body has the same displacement?
    Solution
    In translational motion, every particle of the body has the same displacement. It can be along a straight line or a curved path. The motion along a straight line is called rectilinear motion and the motion along a curved path is known as curvilinear motion.
  • Question 12
    1.2 / -0
    A train is moving with a constant acceleration of 2m/s2 .A boy sitting in train throws up a ball , the ball stays in air for 1 seconds then
    Solution
    The distance traveled by boys is ( velocity of boy X time ) + (1/2)at2
    Horizontal distance traveled by boy = ( velocity of boy X time )
    Difference is distance = ( velocity of boy X time ) + (1/2)at2 - ( velocity of boy X time )
    = (1/2)at2
    = (1/2)2(1)2
    = 1 m
    The distance traveled by boy is 1 m more than the ball hence, the ball will fall 1m behind the boy.
  • Question 13
    1.2 / -0
    Why does the motion of a moving vehicle along a circular path with uniform speed is said to be non-uniform?
    Solution
    Velocity of an object is the distance covered in a particular direction in unit time.
    If a vehicle is moving on a circular path with uniform speed, then its motion is said to be non-uniform because on a circular path, the direction of moving body changes along with the direction of curve.
  • Question 14
    1.2 / -0
    The following experiment is used to demonstrate:-

    Solution
    The inherit property of a body by virtue of which it resists any change in its state of rest or of uniform motion in a straight line on its own is called its inertia. Inertia is a property of matter that causes it to resist changes in velocity. According to Newton's first law of motion, an object with a given velocity maintains that velocity unless acted on by an external force.The amount of inertia that an object possesses is proportional to its mass.To prove this we can take an empty and dry glass tumbler. Place a square piece of thick, smooth card over the mouth of the glass. Place a coin at the centre of the card. Now, flick the card horizontally striking it hard with your finger. The card piece flies away and the coin falls into the glass.
  • Question 15
    1.2 / -0
    A box of mass 5 kg is kept in a truck moving with a constant acceleration of 2 m/s2. If the coefficient of friction is between the box and the surface of truck is n = 0.1, find the force exerted on the box in frame of truck.
    Solution
    The box will experience a pseudo force in frame of truck = (acceleration of truck) x (mass of box) = 2 x 5 = 10 N.
    This force is opposed by friction force = n x mg = 0.1 x 10 x 5 = 5 N.
    Then, net force on the box = 10 - 5 = 5 N
  • Question 16
    1.2 / -0
    Why does a heavier object not fall faster than a lighter object?
    Solution
    Acceleration is constant for all masses, hence heavier object does not fall faster.
    From Newton's law of gravitation, F =
    Where m = mass of object, Me = mass of earth, r = distance of object from centre of earth.
    According to Newton's second law of motion, acceleration of an object, that is
    a = , is independent of its mass.
  • Question 17
    1.2 / -0
    An object is at a height equal to the radius of Earth from the surface of Earth. At this height, the acceleration due to gravity is g1. The object is taken to a height h2 such that the acceleration due to gravity at that height is 4 percent of g1. Find the ratio of the initial to the final height. (R = Radius of Earth)
    Solution
    Let h1 be the initial height.
  • Question 18
    1.2 / -0
    Why is the weight of an object on the moon th of its weight on the earth?
    Solution
    The weight of an object on the earth is the force with which the earth attracts the object. Similarly, the weight of an object on the moon is the force with which the moon attracts the object. The value of g on moon is th of the value of g on earth (g is the acceleration due to gravity). As mass of object is same everywhere, that is why, the weight of an object on the moon is th of its weight on the earth.
  • Question 19
    1.2 / -0
    Chlorofluorocarbons (CFCs) are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants. Why do these molecules when released into the air reach the stratosphere over a period of time?
    Solution
    Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine.
    They are chemically inactive and do not dissolve in rain water. Hence, they are not removed from the air and reach the stratosphere over a period of time.
  • Question 20
    1.2 / -0
    Which of the following is a non-conservative force?
    Solution
    Frictional force is a non-conservative force because in this force, energy is lost in the form of heat and sound.
  • Question 21
    1.2 / -0
    Which of the following is defined as the amount of heat energy required to raise the temperature of one gram of pure water from 14.5oC to 15.5oC?
    Solution
    Calorie is defined as the amount of heat energy required to raise the temperature of one gram of pure water from 14.5oC to 15.5oC.
  • Question 22
    1.2 / -0
    A sound wave has a frequency 4 kHz and wavelength 60 cm. How long will it take to travel 2.4 km?
    Solution
    Given frequency, v = 4kHz = 4×103 Hz,
    Wavelength, = 60cm = 0.6m
    Speed of sound = Frequency × Wavelength
    v = f = (4×103) × (0.6m)
    = 2.4 × 103Hz = 2400 ms-1

    Time, t = distance /speed

    Given distance s, = 2.4 km = 2.4 × 103 m

    Time, t =
  • Question 23
    1.2 / -0
    Which of the following is not correct regarding transverse waves?
    Solution
    If the direction of vibration of the particles of the medium is perpendicular to the direction of wave motion such a wave is called transverse wave.
    Properties of transverse waves are as follow:-

    Transverse waves propagate in the form of crests and troughs.
    There is no difference in pressure created in the medium while the wave propagates.
    These waves can pass through solids and of surface of liquids only, as the propagation of these waves causes change in the shape of the medium.
  • Question 24
    1.2 / -0
    Observe the following pairs of elements and select the option that conveys the correct relation between them.

    I. and

    II. and

    III. and
    Solution
    Isotones are atoms having the same number of neutrons.
    and are isotones.

    Isobars are atoms having the same mass number.
    and are isobars.

    Isotopes are atoms having the same atomic number (atoms of the same element)
    and are isotopes.
    Hence, option (2) is correct.
  • Question 25
    1.2 / -0
    The aroma of a burning incense stick can be detected from a distance because of the phenomenon of diffusion which is faster in the gases. But a similar effect can be experienced when a bottle of liquid perfume is opened.
    Which of the following is the most suitable explanation for the phenomenon?
    Solution
    Perfumes are volatile liquids and vaporise quickly when the bottle is opened. In the gaseous state they spontaneously move from their higher to lower concentration till a uniform composition is obtained.
  • Question 26
    1.2 / -0
    The rate of evaporation decreases, with increase in
    Solution
    The rate of evaporation decreases, with increase in humidity. Humidity is defined as the amount of water vapor present in air. At a particular temperature, the air cannot hold more than a definite amount of water vapor. Thus, a higher humidity in air causes the rate of evaporation to decrease.
  • Question 27
    1.2 / -0
    What will be the mass percentage of 8 g of NaOH in 90 g of water?
    Solution
    Total mass of the solution = 8g of NaOH + 90 g of water = 98g



  • Question 28
    1.2 / -0
    Which of the following substances is not pure?
    Solution
    A pure substance consists of a single type of particles having the same chemical nature.
    Elements like iron, and compounds like hydrochloric acid and calcium oxide are all pure substances.

    Milk, however, is a mixture of several substances, such as water, sugar, fat, protein etc. It is an impure substance because the constituent particles are chemically different.
  • Question 29
    1.2 / -0
    How many moles of CO2 are contained in a sample with volume 173.6 L at S.T.P.?
    Solution
    At S.T.P, the number of moles in 22.4 L of CO2 is 1.
    Therefore the number of moles of CO2 in 173.6 L = 173.6L x = 7.75 mol
  • Question 30
    1.2 / -0
    Which of the following is not a postulate of the Rutherford's model of atom?
    Solution
    The Rutherford's Model of Atom is as follows:

    1.Most of the part in an atom is empty.
    2.There is a positively charged center in atom, which contains nearly the entire mass of the atom. The centre is called nucleus.
    3. The radius of the nucleus is very small as compared to that of the atom.
    4. Electrons revolve round the nucleus.

    However, the concept discreet energy levels around the nucleus, where an atom can be, was given by Bohr, in order to explain the stability of the atom. It is not a postulate of Rutherford's atomic model.
  • Question 31
    1.2 / -0
    Number of atoms in 198.45 g of Al is:
    Solution
    Atomic mass of Al = 27 u
    Molar mass of Al = 27g

    Number of moles = = = 7.35 mol

    Number of atoms = number of moles NA = 7.35 NA
  • Question 32
    1.2 / -0
    A sample of a compound XY, contains 80 atoms of X having atomic mass 13u and 50 atoms of Y having atomic mass 17u. What will be the molecular mass (in u) of the compound XY?
    Solution
    Molecular mass of element XY =
  • Question 33
    1.2 / -0
    Which of the following will have the maximum number of molecules?
    Solution
    The sample containing the maximum number of moles of the gas will have the maximum number of molecules.
    Number of moles in 64 g of Oxygen =
    Number of molecules of Oxygen = 2 × 6.022 × 1023 = 12.044 × 1023 molecules

    0.5 moles of Oxygen gas = 3.011 × 1023 molecules of Oxygen
    22.4 L of Oxygen gas at STP means 1 mole of Oxygen gas = 6.022 × 1023 molecules of Oxygen.
    6.022 × 1023 oxygen atoms = 3.011 × 1023 molecules of Oxygen.
  • Question 34
    1.2 / -0
    Five chemical factories P, Q, R, S and T are located in different cities along a river bank. In order to estimate the pollution caused by these factories, fishes present at the source of discharge of the wastes are counted. A graph based on these observations is plotted as shown.



    What can be inferred from this graph?
    Solution
    The number of fishes found is least at the point of source of discharge of toxic wastes by factory T. Hence, factory T dumps the most toxic wastes in the river.
  • Question 35
    1.2 / -0
    The genetic material in prokaryotes is known as:
    Solution
    The organisms whose cells lack a nuclear membrane are called prokaryotic cells. These cells have primitive organisation of genetic material which is called nucleoid.
  • Question 36
    1.2 / -0
    Which of the following helps in the sorting and processing of proteins?
    Solution
    Golgi apparatus was first described by Camillo golgi. Golgi apparatus consists of a system of membrane-bound vesicles which are arranged somewhat parallel to each other in stacks called cisterns.The Golgi body has a number of functions, including sorting and processing of proteins. Proteins are synthesized in the rough endoplasmic reticulum, then they travel to the Golgi body.
  • Question 37
    1.2 / -0
    Grasses continue to grow and can repeatedly renew themselves after grazing by animals or mowing by humans. Which of the following tissue is responsible for this phenomenon?
    Solution
    Grasses continue to grow from the intercalary meristems and can repeatedly renew themselves after grazing by animals or mowing by humans.
  • Question 38
    1.2 / -0
    The cells that lie on the sides of the sieve tube elements and take part in loading and unloading of sugar are
    Solution
    Companion cells lie on the sides of the sieve tubes and are closely associated with them. Each companion cell is usually closely associated with a sieve element. Its function is to regulate the activity of the adjacent sieve element and to take part in loading and unloading of sugar into the sieve elements.
  • Question 39
    1.2 / -0
    Closely related species resembling each other are grouped into a:
    Solution
    Genus - A taxonomic category ranking used in biological classification that is below a family and above a species level, and includes group(s) of species that are structurally similar or phylogenetically related.
  • Question 40
    1.2 / -0
    Which of the following kingdom includes all organisms which are truly multi cellular and photosynthetic?
    Solution
    There are five kingdoms. Kingdom plantae includes all organisms which are truly multi cellular and photosynthetic.
  • Question 41
    1.2 / -0
    Refer to the graph given below.

    Which of the following could be X?
    Solution
    The graph indicates an increase in the carbon dioxide level. As a result of this, temperature of the earth as the greenhouse effect increases. This will further lead to the melting of ice in the polar regions, leading to an elevation in the sea level.
  • Question 42
    1.2 / -0
    Which out of the following is not a vector borne disease?
    Solution
    Leukaemia is a cancer which starts in blood-forming tissue, usually the bone marrow. It leads to the over-production of abnormal white blood cells, the part of the immune system which defends the body against infection.
  • Question 43
    1.2 / -0
    The components of acid rain are:
    Solution
    Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
  • Question 44
    1.2 / -0
    Refer to the given diagram and select the incorrect statement regarding P, Q, R and S.

    Solution
    According to the diagram given:
    P represents nucleolus.
    Q represents chromatin.
    R represents nucleoplasm.
    S represents nuclear membrane.
    The nucleoplasm has a complex chemical composition. It is composed mainly of the nuclear protein,s but it also contains other inorganic and organic substances such as nucleic acids, proteins, enzymes and minerals. Hence, option 1 is incorrect.
  • Question 45
    1.2 / -0
    Refer to the given flowchart and select the correct statement regarding it.

    Solution
    According to the information given in the flowchart:
    W represents virus.
    X represents bacteria.
    Y represents fungus.
    Z represents either plants or animals.
    Hence, option 2 is correct as athlete's foot is caused by tinea fungus. Late blight of potatoes is caused by the fungus-like oomycete pathogen Phytophthora infestans.
  • Question 46
    1.2 / -0
    Match the following cells with their correct shape.

    Solution
    The shape of cells differ not only in different organisms but also in different parts of the same organism.

  • Question 47
    1.2 / -0
    Which of the following experiment can be used to show the effect of heat on the temperature and physical state of water?


    Solution
    Experiment 1 demonstrates the effect of heat on the temperature and physical state of water.
    The temperature of ice increases on heating, till it attains its melting point i.e., 0oC.
    The temperature remains steady till all of the ice has melted as the heat supplied is used to overcome the intermolecular forces of attraction.
    After the melting is complete, the temperature increases on heating till the boiling point of water i.e., 100oC is attained. Again the temperature remains steady till the phase conversion continues and will rise only when all the water has converted into steam.

    Experiment 2 demonstrates the process of sublimation on heating, but the temperature change cannot be observed and recorded.
    Experiment 3 demonstrates the property of water as a solvent.
    Experiment 4 demonstrates the effect of heat on the solubility of a substance.
  • Question 48
    1.2 / -0
    A mixture of two substances X and Y in ether is subjected to a two step process for separation of the components as depicted in the image below.



    Select from the options given below the most suitable substances to represent X and Y.
    Solution
    Ammonium Chloride is an ionic compound and is insoluble in ether, where as Naphthalene dissolves in ether.
    Therefore, the residue obtained on filtration is Ammonium Chloride (X).
    Naphthalene remains dissolved in ether, which a volatile liquid and vapourizes, leaving behind the solute Y.
    Hence, X is Ammonium chloride and Y is Naphthalene.
  • Question 49
    1.2 / -0
    The following experiment can be used to demonstrate that sound is produced by a vibrating body. Label it correctly.

    Solution
    The aim of this experiment is to demonstrate that sound is produced by a vibrating body. Aids needed for this experiment are tuning fork, rubber pad, table tennis ball, thread and a stand. Hit the tuning fork hard against a rubber pad. It produces sound. If you look at the prongs of the tuning fork closely, they look hazy because they are vibrating. Suspend the table tennis ball with the thread tied to the stand. Bring the prong of the vibrating tuning fork near the ball. The ball jumps to and fro. This shows that the prongs of the tuning fork are vibrating and shows that every source of sound is a vibrating body.
  • Question 50
    1.2 / -0
    Study the following graphs carefully and find the correct option.
    Solution
    Graph shown in (A) represents uniform motion of an object. A body is said to have uniform motion if it travels equal distances in equal intervals of time.
    Graph shown in (B) represents non-uniform motion of an object. A body is said to have non-uniform motion if it travels unequal distances in equal intervals of time.
    Figure (C) represents zero displacement. Displacement can be zero even if the distance is not zero. For example, when a body is thrown vertically upwards from a level A on the ground and after some time it returns to the same level A, then the displacement of the body is zero but the distance travelled by the body is not zero.
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