CBSE Class 9 Science NSO Olympiad MCQs with Answers Set G

Logical Reasoning

Question. The following numbers are coded as follows:

While coding the given number following conditions are also to be observed.
Conditions:
(i) If the first digit of the number is odd, then it will be coded as @.
(ii) If the last digit of the number is even, then it will be coded as ©.
Find the code of 5 2 4 6 5 7 3 8.
A. $* ÷ $+?!
B. @* ÷ + $?©
C. @* ÷ $+?©
D. @ * ÷ +$?!
Answer : C

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

Answer : A

Question. There is a certain relationship between figures (1) and (2). Establish the similar relationship between figures (3) and (4) by selecting a suitable figure from the given options which will replace the (?) in figure (4).

Answer : B

Question. P, Q, R, S, T and U are six persons travelling together in a boat. Three of them Q, R and T are women and the rest are men. However P, Q, R and T are all vegetarian and S and U are non-vegetarian. Q, T and U know swimming while the rest do not know how to swim.
Who among the following is a vegetarian female who does not know swimming?
A. P
B. Q
C. R
D. T
Answer : C

Question. The question consists of a set of three figures X, Y and Z showing a sequence of folding of a piece of paper. Fig. (Z) shows the manner in which the folded paper has been cut. Select a figure from the options which would most closely resemble the unfolded form of Fig. (Z).

Answer : A

Question. Ajay is in the East of Sumit who is in the North of Jatin. If Arnav is in South of Jatin, then Arnav is in which direction with respect to Ajay?
A. North-West
B. South-West
C. South
D. South-East
Answer : B

Question. Find the water image of given combination of letters/numbers/symbols.

Answer : C

Question. Which of the following figures will complete the given figure matrix?

Answer : D

Question. In the given question, two rows of numbers are given.
The resultant number in each row is to be worked out separately based on the following rules and the question below the rows of numbers is to be answered.
The operation on numbers progress from left to right.
Rules:
(i) If a two digit odd number is followed by a prime number, the first number is to be multiplied by the prime number.
(ii) If an even number is followed by another even number, the first number is to be divided by the second number.
(iii) If an odd number is followed by a composite odd number, the first number is to be added to the second number.
(iv) If an even number which is multiple of 5 is followed by another number which is also a multiple of 5, the second number is to be subtracted from the first number.
(v) If a number which is a perfect square is followed by another number which is also a perfect square, the resultant number is the product of the square root of the two numbers.
         64 25 25
         88  8 15
Find the sum of resultant of the both rows.
A. 41
B. 51
C. 37
D. 47
Answer : A

Question. Which of the following options satisfy the same conditions of placement of the dots as in Fig. (X)?

Answer : D

Science

Question. The diagram shows a conducting sphere M between two oppositely charged metal plates.
What would be the resulting charge distribution on sphere M?

Answer : C

Question. A man of height 1.6 m wishes to see his full image in a plane mirror. The minimum height of the mirror needed for this purpose is
A. 3.2 m
B. 2.4 m
C. 1.6 m
D. 0.8 m
Answer : D

Question. The diagram shows a U-tube used to determine the density of liquid P. When liquid P is poured into one arm, the water level in the other arm rises. If the densities of water and liquid P are 1000 kg m–3 and 750 kg m–3 respectively, then what is the value of h ?
A. 7 cm
B. 8 cm
C. 10 cm
D. 12 cm
Answer : B

Question. An escalator carries 20 passengers of average mass of 60 kg. It travels 4.2 m in height in one minute each floor.

What is the minimum power for the escalator for its operation to lift these passengers from the first floor to the third floor? (Take g = 10 m s^–2)
A. 840 W
B. 50400 W
C. 5040 W
D. 252 W
Answer : A

Question. A stone is dropped from a certain height which can reach the ground in 5 seconds. If this stone is stopped after 3 seconds of its fall and is again released, then the total time taken by the stone to reach the ground will be (Take g = 10 m s^–2)
A. 6 s
B. 7 s
C. 8 s
D. 9 s
Answer : B

Question. Two men, at points P and Q, are facing a flat and hard wall as shown. When the man at point P makes a clap, man at point Q hears two claps. If the speed of sound is 320 m s^–1, then what is the time interval between the two claps heard by man at point Q?

A. 0.32 s
B. 0.67 s
C. 1.25 s
D. 2.50 s
Answer : C

Question. The diagram shows a wooden block of mass 10 kg pushed up a rough inclined plane at a constant speed by a force of 50 N. When the block travels from X to Y, it reaches a height of 5 m and travels a distance of 13 m along the plane, then what is the work done against friction?

A. 650 J
B. 600 J
C. 250 J
D. 150 J
Answer : D

Question. Read the given statements and select the correct option. 
Statement 1 : When the displacement of a body is directly proportional to the square of the time, then the body is moving with uniform acceleration. Statement 2 : The slope of velocity-time graph with time axis gives acceleration.
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 but statement 2 is false.
D. Statement 1 is false but statement 2 is true.
Answer : B

Question. The given graph shows the displacement versus time relation for a sound wave travelling with velocity of 1500 m s^–1. Find the wavelength of the sound wave.

A. 5 × 10^–5 m
B. 3 × 10^–3 m
C. 2 × 10^–6 m
D. 1.5 × 10^–3 m
Answer : B

Question. A mass of 100 g strikes the wall with a speed of 5 m s–1 at an angle 60° as shown in figure and it rebounds with the same speed. If the contact time is 2 × 10–3 s, what is the force applied by the wall ?

A. 250 3 N to right
B. 250 N to right
C. 250 3 N to left
D. 250 N to left
Answer : C

Question. A spring is compressed between two toy carts of masses m1 and m2. When the toy carts are released then spring exerts equal and opposite average force on each for the same time t. Assume that there is no friction between the toy carts and the ground, the velocities of toy carts are
A. In opposite directions but in inverse ratio of their masses
B. In opposite directions but in direct ratio of their masses
C. Equal and in opposite direction
D. Equal and in same direction.
Answer : A

Question. Which of the following statements is incorrect?
(i) The flow of electric current in the circuit is from negative to the positive terminal of the battery.
(ii) Pure water is a good conductor of electricity.
(iii) In the electroplating of copper, copper gets transferred form the anode to the cathode.
(iv) In a dry cell, the electrolyte is a paste of ammonium chloride.
A. (i) and (iv) only
B. (ii) and (iv) only
C. (ii) and (iii) only
D. (i) and (ii) only
Answer : D

Question. Which of the following statements are correct?
I. At 273 K, both ice and water co-exist.
II. Ice at 0 °C is more effective in cooling a substance than water at 0 °C.
III. Particles in water at 0 °C have more energy as compared to particles in ice at the same temperature.
IV. Increase in pressure increases the freezing point of ice.
A. I and IV only
B. I, II and III only
C. III and IV only
D. I, II, III and IV
Answer : B

Question. Read the given passage carefully and fill in the blanks by choosing an appropriate option. Coal is one of the earliest used (i) resources of energy. Coal beds generally contain large amount of
(ii) gas which can also be obtained by destructive distillation of coal. A dark brown, foul smelling liquid called (iii) is also obtained from destructive distillation of coal which is further used to obtain (iv) .
           (i)                        (ii)               (iii)             (iv)
A. Renewable            Butane          Coke          Paints
B. Inexhaustible        Natural gas   Coal tar      Coke
C. Exhaustible          Methane        Coal tar      Naphthalene balls
D. Non-renewable    Coal gas        Coke          Coal tar
Answer : C

Question. Arrange the following in the order of increasing mass.
(Atomic mass of O = 16 u, Cu = 63 u, N = 14 u)
I. one atom of oxygen
II. one atom of nitrogen
III. 1 × 10–10 mole of oxygen gas
IV. 1 × 10–10 mole of copper
A. II < I < III < IV
B. I < II < III < IV
C. III < II < IV < I
D. IV < II < III < I
Answer : A

Question. Abhinav, a class 9 student arranged the given experimental set-up to study the reactivity of some metals with water.

He summarised his observations as follows :
I. In test tube P, there was no reaction in cold water but when the test tube was heated for a while, bubbles of gas were seen.
II. In test tube Q, bubbles of gas were formed only after boiling the water.
III. In test tube R, no gas was produced even on boiling the water.
IV. In test tube S, reaction occurred vigorously.
The metals present in test tubes P, Q, R and S could be respectively
A. Na, Mg, Zn and Fe
B. Mg, Zn, Cu and Na
C. Na, Mg, Al and Cu
D. Mg, Zn, Fe and Al.
Answer : B

Question. Element P has 5 electrons in its L shell while element Q has 5 electrons in its M shell. Which of the following statements is correct regarding elements P and Q?
A. Both elements have valency equal to 5 only.
B. Both elements have the same mass number.
C. Atomic number of element P is 7 and that of element Q is 15.
D. Both elements show valency equal to 3 only.
Answer : C

Question. Match column I with column II and select the correct option from the given codes.
    Column I                                      Column II
P. Teflon                     (i) Can be blown up into large foam containing air bubbles
Q. Polystyrene          (ii) Easily moulded, can be rolled into thin sheets
R. Polythene             (iii) Tougher than polythene, can be coated on cloth
S. PVC                     (iv) High melting point, very low friction
A. P – (iii), Q – (iv), R – (ii), S – (i)
B. P – (iv), Q – (ii), R – (i), S – (iii)
C. P – (iv), Q – (i), R – (ii), S – (iii)
D. P – (iii), Q – (iv), R – (i), S – (ii)
Answer : C

Question. Ms Diksha, a science teacher gave different substances to three students. One spatula full of copper sulphate was given to student 1, wheat flour was given to student 2 and ink was given to student 3. Each student added the given sample to water and stirred. Which of the following statements is incorrect about the mixtures prepared by them?
A. Particles are not visible to the naked eye in case of mixtures obtained by student 1 and student 3.
B. The path of light becomes visible in case of mixture obtained by student 1.
C. When passed through filter paper, particles of mixture obtained by student 2 remain behind on the filter paper.
D. The particles of mixture obtained by student 3 are about 100 times bigger than those of the mixture obtained by student 1.
Answer : B

Question. Study the given flow chart carefully and identify P, Q, R, S and T.

Answer : C

Question. The given graph represents the cooling curve of substance X.

Which of the following statements are incorrect?
I. Process I represents cooling of liquid state of X while process III involves cooling of the solid state.
II. The freezing point of substance X is 25 °C.
III. At 35 °C, the substance exists in solid state.
IV. Substance X exists both in gaseous and liquid form along the curve QR.
A. I and III only
B. II and IV only
C. III and IV only
D. None of these
Answer : A

Question. Read the given passage and fill in the blanks by choosing an appropriate option.
When a mixture of two (i) liquids having a difference of 25 °C in their boiling points is to be separated, a (ii) is used which increases the (iii) surface area. As a result, when the vapours of both the liquids rise, the (iv) volatile liquid will condense while the vapours of (v) volatile liquid will rise.

Answer : C

Question. Read the given paragraph.
X is a butterfly shaped gland located in the front part of lower neck. Y is a triangular gland present in pair on the top of each kidney. Z is a mixed gland located inferior to stomach which secretes digestive juices as well as hormones. 
Now select the incorrect option regarding glands X, Y and Z.
A. X functions as biological clock by secreting a hormone that regulates sleep-wake cycle in humans.
B. If a person is terrified or stressed then gland Y releases a hormone that helps his body to adjust with the stress.
C. Gland Z secretes its hormones when blood glucose concentration is either above or below the normal reference range.
D. Abnormal secretion from gland X may lead to various disorders like exophthalmic goitre, myxoedema, etc.
Answer : A

Question. Refer to the given Venn diagram and select the correct option regarding X, Y and Z.

A. X causes citrus canker and wilt diseases in plants and is also responsible for causing tetanus, athlete's foot, etc., in humans.
B. Y is always multicellular and could be Alternaria, Puccinia or Ustilago.
C. Z possesses chlorophyll and could be unicellular e.g., Chlamydomonas, or multicellular, e.g., Spirogyra.
D. X is always anaerobic whereas Y and Z are always aerobic.
Answer : C

Question. Refer to the given Venn diagram and select the correct option regarding P and Q.

A. Q could be a disease that is commonly treated by a drug obtained from bark of Cinchona tree.
B. P could be a fever which is transmitted by the bite of Aedes aegypti mosquito that bites during daytime.
C. P could be a disease characterised by severe joint pain and sudden onset of high fever whereas Q could be dum-dum fever or sleeping sickness.
D. All of these
Answer : D

Question. Refer to the given flow chart and select the correct option regarding P, Q, R and S.

A. P could be dhekli whereas Q could be chain pump.
B. S minimises wastage of water by minimising evaporation and run off.
C. R is very effective in case of plants growing in both marshes and saline soil.
D. P and Q are related with generation of hydroelectricity whereas R and S are related to mitigation of drought.
Answer : B

Question. Refer to the given figures of different animals.
Read the characteristics given below and select the option that correctly matches these animals with their characteristics stated.

(i) Coelom absent (ii) Pseudocoelom present
(iii) True coelom present (iv) Triploblastic animal
(v) Flame cells as excretory organs
(vi) Body metamerically segmented
(vii) Nephridia are excretory organs
A. X-(i, vi, vii), Y-(ii, iv, vi), Z-(iii, v, vi)
B. X-(i, iv, v), Y-(ii, iv), Z-(iii, iv, vi, vii)
C. X-(ii, iv, vi), Y-(i, v, vii), Z-(iii, iv, v)
D. X-(iii, vi), Y-(ii, iv, vii), Z-(i, v)
Answer : B

Question. Select the correct statement regarding cell wall of plant cells.
A. Primary cell wall is chiefly composed of a soluble fibrous polysaccharide called suberin.
B. Secondary cell wall is mainly composed of lignin and is deposited on the outer surface of primary wall.
C. Pits are present in primary walls whereas they are absent in secondary walls.
D. The primary cell walls of adjacent cells are cemented through middle lamella which is composed of calcium and magnesium pectate.
Answer : D

Question. Select the group that contains only the micronutrients.
A. Sulphur, Molybdenum, Nitrogen
B. Zinc, Copper, Manganese
C. Oxygen, Iron, Potassium
D. Carbon, Chlorine, Nickel
Answer : B

Question. Refer to the given diagram of an animal cell and select the correct option regarding P and Q.

A. Some of the vesicles of P store digestive enzymes obtained from Q in inactive state to form primary lysosome.
B. Polypeptides synthesised at P are transported to Q where they are modified into functional proteins for secretion.
C. Q synthesises acrosome which plays an important role in the fertilisation process in humans.
D. P is absent in pancreatic cells and cells of salivary glands whereas Q is absent in liver cells.
Answer : A

Question. Riddhi drew a classification chart as shown below

Now, select the option that correctly identifies the characters X, Y, P or Q.
A. X is eucoelomic body cavity.
B. P is bilateral body symmetry.
C. Q is radial body symmetry.
D. Y is coelomic cavity lined by mesoderm.
Answer : D

Question. The given graph shows the pathogen load in the body of a person during the period of sickness.

Now select the correct option regarding this. 
A. The person is suffering from two pathogenic infections simultaneously.
B. X could be a viral infection that decreased rapidly after antibiotic treatment.
C. Both X and Y are different bacterial infections where recovery in case of X is due to body's immunity whereas that in case of Y is due to antibiotic treatment.
D. Both X and Y are viral infections which decreased due to body's immunity and antibiotic treatment had no role in it.
Answer : A

Question. Refer to the given figure and select the option that correctly compares structures X and Y.

A. X always carries urine whereas Y always carries semen.
B. In each male individual, X exists singly but Y exists in a pair.
C. The flow of fluid through X can be controlled voluntarily but such control does not exist in Y.
D. Both B and C
Answer : D

Question. A Visking tubing is filled with solution X and placed in a boiling tube of solution Y. After 20 minutes, the Visking tubing appeared to be larger and heavier.
Which of the following correctly identifies solutions X and Y ?

             Solution X                       Solution Y
A. 2 M sucrose solution         0.1 M sucrose solution
B. 0.5 M sucrose solution     1 M sucrose solution
C. 1 M sucrose solution        5 M sucrose solution
D. Distilled water                   2 M sucrose solution
Answer : A

Question. Read the given paragraph.
Soil X has very poor water holding capacity, soil Y is well drained and contains one part clay and two parts each of sand and silt. Soil Z has excellent water holding capacity but is poorly aerated.
Select the correct statement regarding soils X, Y and Z.
A. Soil X is commonly found in those regions where xerophytes are abundant.
B. Soil Z is best suited for growth of plants like Casuarina, Eucalyptus and watermelon.
C. Soil Y is best suited for making pots.
D. All of these
Answer : A

Achievers Section

Question. If K, p and m represent the kinetic energy, momentum and mass of a body respectively, then which of the following graphs is incorrect?

Answer : D

Question. Fill in the given blanks by choosing an appropriate option.
A sound of single frequency is called a (i) . The sound produced due to a mixture of several frequencies is called a (ii) and is pleasant to listen. Sound propagates through a medium at a finite speed but the speed of sound (iii) as it propagates from solid to gaseous medium. In any medium as we (iv) the temperature, the speed of sound also (v) .
       (i)        (ii)         (iii)                 (iv)             (v)
A. Note   Tone    Increases     Decrease    Decreases
B. Note   Tone    Decreases    Increase     Increases
C. Tone   Note    Decreases    Increase     Increases
D. Tone   Note   Increases      Increase     Increases
Answer : C

Question. The given figure shows the set-up to study the reaction between gas X and copper (II) oxide :

Which of the following statements are correct?
[Given : Atomic mass of N = 14 u, H = 1 u, O = 16 u, C = 12 u]
I. Gas X is a compound of two elements, nitrogen and hydrogen.
II. The number of atoms present in 11.2 L of N₂ is 6.023 ×10²³.
III. 1 mole of H₂O contains 1 mole of oxygen molecules and 2 moles of hydrogen atoms.
IV. N₂ gas being soluble in water is collected by upward displacement of water.
A. I and II only
B. I and III only
C. II and IV only
D. III and IV only
Answer : A

Direction (Q. No. a and b) : Refer to the given dichotomous key and answer the following questions.
I. (a) The cells of tissue have walls. – Go to II
(b) The cells of tissue do not possess wall. – Go to III
II. (a) Tissue made of one type of cells. – Go to IV
(b) Tissue, made of more than one type of cells. – Go to V
III. (a) The tissue lines the alveoli of lungs. – P
(b) The tissue forms shock absorbing cushion around some vital organs. – Q
IV. (a) Cells of tissue contain air cavities and it provides buoyancy. – R
(b) The tissue provides mechanical strength and flexibility to young dicot stems and petioles.  – S
V. (a) Tissue conducts water. – T
(b) Tissue conducts organic solutes. – U

Question a. Select the incorrect option regarding tissues P, Q, R, S, T and U.
A. P is an epithelial tissue whereas Q is a loose connective tissue.
B. T is either greatly reduced or absent but R is exclusively present in aquatic floating plants whereas S is found in Cucurbita stems.
C. R is aerenchyma, S is collenchyma, T is xylem and U is phloem.
D. U is found in grit of guava, pear, etc., whereas the matrix of tissue P contains a flexible material called chondrin.
Answer : D

Question b. Select the correct match of tissue and its location.
A. P-Wall of Bowman's capsule S-Epidermal covering of legume seeds
B. Q-Blubber of whale R-Covering of nuts
C. R-Petiole of lotus U-Hump of camel
D. Q-In subcutaneous tissue T-Stele or vascular cylinder of monocot root
Answer : D