CBSE Class 9 Science NSO Olympiad MCQs with Answers Set C

Logical Reasoning

Question. There are seven figures, the first and last of which are unnumbered and the remaining are numbered as 1, 2, 3, 4 and 5. These seven figures form a series. However, one of the five numbered figures does not fit into the series. The number of that figure is the answer

A. 5
B. 2
C. 4
D. None of these
Answer : D

Question. The given numbers are to be coded with the following conditions :

(i) If the first and the last digits of the number are odd, then each of those odd digits is to be coded as X.
(ii) If the first digit of a number is even, then it will be coded as Y.
(iii) If the only first digit of a number is odd, then it will be coded as Z.
(iv) If 5 or 8 is neither the first digit nor the last digit of the number, then each of them will be coded as W.
(v) If the first and the last digits of the numbers are even, then each of those even digits is to be coded as V.
5 1 5 3 6 0 7 9
A. XNWRSLOX
B. XNPRSLOX
C. WNWRSLOX
D. XNPRSLOT
Answer : B

Question. Find the number of triangles in the given figure.

A. 45
B. 44
C. 47
D. None of these
Answer : D

Question. If South-East becomes North, North-East becomes West and so on, then what will West becomes?
A. North-East
B. North-West
C. South-East
D. South-West
Answer : C

Question. Which of the following figures satisfies the same condition of placement of the dots as in Fig. (X)?

Answer : B

Question. Introducing a woman, Shashank said, “She is the mother of the daughter of my son”. How is the woman related to Shashank?
A. Daughter
B. Sister-in-law
C. Wife
D. Daughter-in-law
Answer : D

Question. Find the missing number, if a certain rule is followed in all the three figures.

A. 127
B. 137
C. 141
D. 147
Answer : A

Question. J, K, L, M, N, O and P are seven kids playing in the garden. They all are wearing clothes of different colours–black, blue, white, green, pink, yellow and brown. Out of the seven, three are girls. No girl is wearing either black, yellow or brown. M’s sister O is wearing pink, while he is wearing brown. J is wearing blue, while his sister K is not wearing green. N is wearing yellow, while his best friend P is a boy.
What colour is P wearing?
A. Black
B. Blue
C. White
D. Green
Answer : A

Question. In which of the following figures, Fig. (X) is exactly embedded as one of its part?

Answer : D

Question. Select the water-image of the given combination of numbers and letters.

Answer : C

Science

Question. A boy moving with constant acceleration from A to B in the straight line AB has velocities vA and vB at A and B respectively. Time taken by the boy to move from A to C is twice of that from C to B, where C is the mid-point of AB. The ratio of vA to vB is
A. 1 : 2
B. 1 : 3
C. 1 : 5
D. 1 : 7
Answer : D

Question. Two bodies of masses m₁ and m₂ are dropped from heights h₁ and h₂ respectively. On reaching the ground, they acquire equal momenta. If h₁ > h₂, the ratio of kinetic energy of m₁ to that of m₂ on reaching the ground will be
A. Equal to 1
B. Greater than 1
C. Less than 1
D. Data is insufficient
Answer : B

Question. The diagram shows a jar with the dimensions as shown . It contains a liquid of mass 3 kg and density 600 kg m^–3. The pressure exerted by the liquid on the base of the jar is
(Take g = 10 ms^–2)

A. 1.2 × 10³ Pa
B. 2.4 × 10³ Pa
C. 1.2 × 10⁵ Pa
D. 2.4 × 10⁵ Pa
Answer : A

Question. Two bodies of masses m1 and m2 exert a force F on each other when placed a certain distance d apart.
The percentage change in force when the separation between the bodies is decreased by d/3, is
A. 800% decrease
B. 225% increase
C. 200% decrease
D. 125% increase
Answer : D

Question. When moving from X to Y, a ship sends pulses of ultrasonic waves continuously to the bottom of the sea. The variation of the time interval t between the emission of a pulse and the reception of its reflection with position is shown in the given graph.

If the speed of sound in water is 1530 ms^–1, then the difference in depths of the sea at B and D is
A. 153 m
B. 306 m
C. 612 m
D. 765 m
Answer : B

Question. Read the given statements and select the correct option.
Statement 1 : Work done against friction in moving a body over a closed path is zero.
Statement 2 : Work done by a constant force is always zero in a round trip of the point of application of force.
A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C. Statement 1 is false but statement 2 is true.
D. Both statements 1 and 2 are false.
Answer : C

Question. The diagram shows a car of 800 kg approaching the base of a hill

It moves up the hill with a constant speed of 25 ms^–1.
Neglecting friction, what is the average power required for the car to reach the peak of the hill?
(Take g = 10 ms^–2)
A. 10 kW
B. 15 kW
C. 25 kW
D. 30 kW
Answer : C

Question. The given figure shows a ray of light directed onto a plane mirror at an angle of 45° initially. The mirror is then rotated by 12° about point O as shown in the figure.

The new angle of reflection is
A. 12°
B. 23°
C. 33°
D. 57°
Answer : C

Question. A scooterist moving with a speed of 36 km h^–1 sees a child standing in the middle of the road. He applies the brakes and brings the scooter to rest in 5 s just in time to save child. If mass of the scooter and driver is 300 kg, the average retarding force on the scooter is
A. 6 × 107 g cm s^–2
B. 6 × 104 g m s^–2
C. 6 × 105 kg cm s^–2
D. 6 × 103 kg m s^–2
Answer : A

Question. The tail of a comet points away from the Sun due to
A. Centrifugal force
B. Electrical repulsion
C. Attraction of comet due to other planets
D. Radiation pressure.
Answer : D

Question. Which of the following statements are correct?
(i) Direction of momentum of a body may or may not be same as the direction of the velocity of the body.
(ii) The rate of change of momentum and the force have same units.
(iii) Action and reaction act on two different bodies.
A. (i) and (ii) only
B. (ii) and (iii) only
C. (i) and (iii) only
D. (i), (ii) and (iii)
Answer : B

Question. The weight of a rock on Jupiter is 500 N. The value of acceleration due to gravity (in N kg^–1) on the surfaces of Moon, Earth and Jupiter is 1.7, 10 and 25 respectively. The difference between weight of rock on earth and that on Moon is
A. 0 N
B. 8.3 N
C. 166 N
D. 233 N
Answer : C

Question. Boiling points of some gases are given in the table

The gases that are in the liquid state at –200°C are
A. Methane, oxygen and xenon
B. Helium, neon and xenon
C. Helium and neon
D. All the gases given in the table.
Answer : A

Question. Match the column I with column II and select the correct option from the given codes. (Atomic mass of Ca = 40 u,C = 12 u, O = 16 u, H = 1 u)
      Column I                                             Column II
(a) 6.022 × 10²² molecules of CaCO₃      (i) 2.65 g
(b) 0.5 mole of O₂                                     (ii) 10 g
(c) 10²³ molecules of CH₄                        (iii) 60 g
(d) 1.5 moles of Ca                                   (iv) 16 g
A. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
B. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
C. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
D. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
Answer : B

Question. Nimit prepared a flowchart to show classification of fibres and plastics. He left few columns blank. Fill in the blanks by choosing the option with correct words.

A. P - Plant fibres, Q - Animal fibres, R - Thermoplastics, S-Thermosetting
B. P - Animal fibres, Q - Plant fibres, R - Thermosetting, S - Thermoplastics
C. P - Rayon, Q - Animal fibres, R - Biodegradable, S - Non-biodegradable
D. P - Animal fibres, Q - Plant fibres, R - Non-biodegradable, S - Biodegradable
Answer : B

Question. Different samples of soft drinks are tested for additives by using chromatography. The chromatograms are compared with those of artificial additives, X and Y.
The results are as follows

Which soft drink does not contain any of these artificial additives?
A. Cola
B. Soda
C. Banta
D. Campa
Answer : D

Question. Anurag has arranged the following set-ups to study the rusting of iron.

Iron nails will not rust in test tubes
A. 1 and 2
B. 1 and 4
C. 2 and 3
D. 3 and 4
Answer : C

Question. The nucleon number of an atom Q is 49. Atom Q exists as a tetraatomic molecule, Q₄. One molecule of Q₄ contains 68 protons. How many neutrons are present in the nucleus of atom Q?
A. 32
B. 68
C. 49
D. 57
Answer : A

Question. The given diagram represents a fractionating column where petroleum is separated into various fractions. Arrange the fractions X, Y, Z in order of decreasing boiling point range and identify the fraction that condenses first.

A. Z > Y > X; X
B. Z > Y > X; Z
C. X > Y > Z; Y
D. Y > Z > X; Z
Answer : B

Question. Neha, a class IX student heated a beaker containing ice and water as demonstrated in the given figure. 

She measured the temperature of the content of the beaker as a function of time. Which of the following graphs would correctly represent the result?

Answer : D

Question. Calorific values of some fuels are given :

On the basis of this data, find out the correct order of efficiency of fuels.
A. Biogas > Petrol > CNG > Hydrogen
B. CNG > Hydrogen > Biogas > Petrol
C. Hydrogen > CNG > Petrol > Biogas
D. Petrol > CNG > Biogas > Hydrogen
Answer : C

Question. In an experiment, three metals X, Y and Z were placed into four separate solutions containing aqueous metal ions. The results are shown in the table.

The decreasing order of reactivity of the metals
A. X > W > Y > Z
B. X > W > Z > Y
C. X > Z > W > Y
D. Y > Z > W > X
Answer : B

Question. Study the given flow chart and select the incorrect statement regarding P, Q, R and S.

A. ‘P’ can be the tissue which is present in root tips and shoot tips.
B. Tissue ‘Q’ is primarily responsible for storage of food.
C. Tissue ‘R’ is responsible for transport of food from leaves to other parts of the plant body.
D. Tissue ‘S’ is made up of four types of cells–vessels, tracheids, fibres and parenchyma.
Answer : B

Question. While observing a stained mount of onion peel under high power compound microscope, the central part of the cell does not take stain. Which of the following options correctly identifies this central part of the cell?
A. Nucleus
B. Cell wall
C. Vacuole
D. Chloroplas 
Answer : C

Question. The given figure represents the structure of the causal organism of a disease, which is

A. An autoimmune disease, caused by a virus
B. An immunodeficiency disease, caused by a virus
C. An immunodeficiency disease, caused by a bacterium
D. An autoimmune disease, caused by a bacterium.
Answer : B

Question. Select the correct statement regarding the members of the phylum to which the given animal belongs?

A. They possess tissue level of organisation.
B. They are mostly fresh water organisms.
C. Their body is bilaterally symmetrical.
D. They possess a canal system that helps to circulate water throughout the body.
Answer : D

Question. Read the given statements and select the correct option.
Statement 1 : An increase in the concentration of greenhouse gases in the atmosphere would cause more heat to be retained by the atmosphere leading to global warming.
Statement 2 : Greenhouse gases, e.g., CO₂, CH₄ etc., reflect back the infrared radiations reflected by the earth’s surface.
A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C. Statement 1 is true and statement 2 is false.
D. Statement 2 is true and statement 1 is false.
Answer : A

Question. Study the given diagram representing the process of osmosis and select the correct statement regarding this.

A. Limb P of the U-tube functions like the root hair of a plant for the absorption of water.
B. Net movement of sucrose molecules takes place from limb Q to limb P of the U-tube.
C. Net movement of water molecules takes place from limb P to limb Q of the U-tube.
D. Semi-permeable membrane allows only solute sucrose molecules to pass through it.
Answer : A

Question. In a slide of animal tissue, Ridhima observed long, uninucleate, unbranched, narrow and spindle-shaped cells. This tissue could be
A. Skeletal muscle
B. Smooth muscle
C. Cardiac muscle
D. Nervous tissue.
Answer : B

Question. The practice in which green plants like sunn hemp, guar etc., are grown and then mulched by ploughing them into soil, results in the formation of (i) , which enriches the soil with (ii) .Select the correct option for (i) and (ii).
        (i)                              (ii)
A. Compost             Organic matter
B. Fertilizer              Potassium and magnesium
C. Bio-fertilizer        Blue green algae
D. Green manure    Nitrogen and phosphorus
Answer : D

Question. Match column I with column II and select the correct option from the given codes.
      Column I              Column II
(a) Ribosomes           (i) Jelly like substance
(b) Lysosomes          (ii) Powerhouse of the cell
(c) Endoplasmic       (iii) Site of protein reticulum synthesis
(d) Cytoplasm          (iv) Synthesis of lipids
(e) Mitochondria      (v) Suicide bags
A. (a) - (iii), (b) - (v), (c) - (iv), (d) - (i), (e) - (ii)
B. (a) - (iv), (b) - (v), (c) - (iii), (d) - (i), (e) - (ii)
C. (a) - (iii), (b) - (iv), (c) - (i), (d) - (v), (e) - (ii)
D. (a) - (iv), (b) - (v), (c) - (ii), (d) - (i), (e) - (iii)
Answer : A

Question. Study the following table and select the correct option for p, q, r, s and t.

A. p-Virus, q-Hepatitis A, r-Virus, s-Mosquito, t-Protozoan
B. p-Bacterium, q-Cholera, r-Virus, s-Mosquito, t-Protozoan
C. p-Virus, q-Cholera, r-Virus, s-Mosquito, t-Protozoan
D. p-Virus, q-Typhoid, r -Protozoan, s-Air, t-Bacterium
Answer : C

Question. A simplified representation of nitrogen cycle is given here.

Which of the following statements regarding ‘X’, ‘Y’ and ‘Z’ is correct?
A. ‘X’ represents proteins which are added into the soil by the process of nitrogen fixation.
B. ‘Y’ represents ammonia which is formed by decomposition of dead plant and animal remains.
C. ‘Z’ represents the process of nitrogen assimilation, by which nitrates are converted back into atmospheric nitrogen.
D. ‘Z’ represents the formation of nitrogen gas by putrefaction of plant and animal matter.
Answer : B

Question. What is the function of the part labelled as 'X' in the given figure?

A. It produces the ovum when a female reaches puberty.
B. It transports the ovum from the ovary to the uterus.
C. It serves as the site of implantation of the embryo.
D. It is the place where development of embryo takes place.
Answer : B

Question. Which of the following statements is false about a Biosphere Reserve?
A. It is meant for the conservation of biodiversity and culture of an area.
B. It may contain other protected areas within its limits.
C. Some economic activities are permitted in a Biosphere Reserve but in controlled manner.
D. It is an artificially created area meant for the conservation of plants and animals.
Answer : D

Achievers Section

Question. Nikita completed a journey from a place A to another place B by her car.
The given graph shows the speed variations with time over the journey.
The average speed between 10:15 am to 11:05 am is

A. 6.00 m s^–1
B. 6.25 m s^–1
C. 6.50 m s^–1
D. 6.75 m s^–1
Answer : C

Question. Fill in the blanks by choosing an appropriate option.
The external ear which we see is known as
(i) . This part collects the sound and sends it to the auditory canal. The sound in the form of compressions and rarefactions reaches the (ii) , and it begins to vibrate. The vibrations are amplified several times by three bones : the hammer, (iii) and stirrup. The amplified vibrations are then transmitted to the (iv) , which converts them into electric signals. These electric signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.

           (i)                (ii)            (iii)          (iv)
A. Cochlea     Ear drum    Pinna         Anvil
B. Ear drum    Anvil           Cochlea     Pinna
C. Pinna         Ear drum    Cochlea     Anvil
D. Pinna         Ear drum    Anvil          Cochlea
Answer : D

Question. The electronic structures of atoms L, M and K are shown in the given figures.

Atom L has an isotope with the same nucleon number as M. How many protons, neutrons and electrons does the isotope of L contain? What is the relationship between atom K and atom M?
     Protons    Neutrons        Electrons     K and M are
A. 19              21                    19                 Isotopes
B. 19              21                    19                 Isobars
C. 19              21                    20                 Isobars
D. 20              20                    20                 Isotopes
Answer : B

Question. Read the following statements carefully and identify which of them are true (T) and which of them are false (F).
(i) Aphids, bugs, etc., are sucking insects whereas weevils, borers, etc. are internal feeders.
(ii) Exotic breed which is very popular for egg laying but is not ideal for meat purposes is White Leghorn.
(iii) Concentrates in cattle feed consist of mostly fibres which come from hay, green fodder, etc.
(iv) Fertilizers contain much higher amount of nutrients in comparison to the manures.
(v) Karan Swiss is a high yielding cross breed cattle variety while Jersey-Sindhi is an indigenous breed of India.
    (i)     (ii)     (iii)     (iv)     (v)
A. F       T       F       T        F
B. T       T       F       T        F
C. T       T       T       T        F
D. F       F       F       T       T
Answer : B

Question. Read the given passage in which some words are italicised.
Rainfall is a major source of ground water. When the rain falls, some water is lost as run off. The remaining water percolates into the ground through pore spaces of soil particles under the influence of gravity. Some water forms an extremely thin, tightly held film around soil particles and is termed capillary water. The down moving water called gravitational water finally reaches the underground water table. Plants can draw only gravitational water from the soil.
Some of these italicised words are put incorrectly.
Find out them and select the correct option.
A. Rainfall should be replaced by oceans.
B. Run off should not be replaced as it is correctly mentioned.
C. Capillary should be replaced by gravitational.
D. Gravitational should be replaced by hygroscopic.
Answer : B