CBSE Class 7 Science NSO Olympiad MCQs with Answers Set C

LOGICAL REASONING

Question. Select a figure from the options which does not satisfies the same condition of placement of the dots as in Fig. (X).

Answer : B

Question. If in a certain code ‘VERBAL’ is written as ‘YHUEDO’, then how will ‘PERFECT’ be written in the same code language?
A. CTZXPUV
B. RGTHGEV
C. SHUIHFW
D. SHTHGFW
Answer : C

Question. Which of the following numbers will complete the given number series?
7 , 3 , 8 , 6 , 10, 9 , 13 , 12 , 17 , ? , 22
A. 13
B. 14
C. 15
D. 16
Answer : C

Question. The four different positions of a dice are given below.

Which number is on the face opposite to 1 ?
A. 6
B. 2
C. 3
D. 4
Answer : A

Question. Pointing to a photograph X said to his friend Y,
“She is the only daughter of the father of my mother.”
How X is related to the person in the photograph?
A. Sister
B. Son
C. Nephew
D. None of these
Answer : B

Question. Select a figure from the options which will continue the same series as established by the Problem Figures.

Answer : B

Question. Five friends Aman, Karan, Gaurav, Raman and Pawan are sitting around a circle facing the centre. Pawan is second to the left of Raman, who is to the immediate left of Gaurav. Karan is the neighbour of Gaurav. Then who is sitting to the immediate right of Gaurav?
A. Aman
B. Pawan
C. Raman
D. Karan
Answer : D

Question. Tarun faces towards North. Turning to his right, he walks 25 metres. He then turns to his left and walks 30 metres. Next, he moves 25 metres to his right. Finally, he turns to the right and moves 40 metres. In which direction is he now from his starting point?
A. South-West
B. South
C. North-West
D. South-East
Answer : D

Question. Select a figure from the options, which when placed in the blank space of Fig. (X) would complete the pattern.

Answer : B

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 : B

SCIENCE

Question. A plane mirror is positioned at the corner of a road as shown in the given figure.

Which man/men can the observer X see through the mirror?
A. 2 only
B. 1 only
C. 1 and 2 only
D. 2 and 3 only
Answer : D

Question. The given diagram shows an electrical appliance with a metal box, indicated by the dotted line, connected to a mains supply. Where should the fuse be placed?

A. P
B. Q
C. R
D. S
Answer : A

Question. Which of the following statements are true?
(i) High speed wind increases air pressure.
(ii) At night, the land cools faster than water which results in land breeze.
(iii) At poles, the air is very cold and sinks close to the surface creating high pressure area.
(iv) Air exerts pressure sometimes only.
A. (i) and (ii)
B. (ii) and (iii)
C. (iii) and (iv)
D. (i), (ii) and (iii)
Answer : B

Question. Three glasses containing water at the same temperature, are placed side by side touching each other as shown in the given figure. Given that glass 1 contains 0.3 kg of water, glass 2 contains 0.5 kg of water and glass 3 contains 0.1 kg of water.

Which of the following statements is true?
A. Heat flows from glass 1 to glass 2 and from glass 2 to glass 3.
B. Heat flows from glass 2 to glass 1 and from glass 2 to glass 3.
C. Heat flows from glass 1 to glass 2 and from glass 3 to glass 2.
D. Heat does not flow among these three glasses.
Answer : D

Question. Which of the following is correct for lateral inversion?
A. Right side of the object will be right side of the image.
B. Left side of the object will be left side of the image.
C. Upside of the object will be down side of the image.
D. Right side of the object will be left side of the image.
Answer : D

Question. Read the given statements and mark the correct option.
Statement 1 : One complete to and fro motion of a clock’s pendulum takes one second.
Statement 2 : Anything that occurs or appears at regular intervals can help us to measure time.
A. Both statement 1 and statement 2 are true and statement 2 is the correct explanation of statement 1.
B. Both statement 1 and statement 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. A magnet X is being moved slowly towards another magnet Y which has attracted steel pins as shown in the given figure.

The string of attracted pins
A. Remains stationary
B. Gets attracted to the left X
C. Gets repelled to the right
D. Falls off from the magnet.
Answer : C

Question. The diagram shows a thin copper rod being heated evenly along its length. Which of the following statements is true about the rod?

A. The bar expands and becomes lighter.
B. The bar will become shorter in length.
C. The bar expands and its length increases.
D. The bar expands and becomes heavier.
Answer : C

Question. An object O is placed in between two plane mirrors, P and Q, as shown in the given figure.

Which is a possible image of the object?
A. R
B. S
C. T
D. U
Answer : A

Question. Reeta puts two different objects in each of the following containers.
Container (i) : Copper coin and iron nail
Container (ii) : Steel nail and aluminium earring
Container (iii) : Marble and gold coin
Container (iv) : Nickel coin and steel nail
She can use a magnet to separate the objects in containers __________ .
A. (i) and (ii)
B. (i), (ii) and (iii)
C. (i), (ii) and (iv)
D. (i), (ii), (iii) and (iv)
Answer : A

Question. The given figures show the colour changes in test tubes I, II and III, when China rose indicator is added to them. The respective solutions in test tubes I, II and III are

A. Soda water, Nitric acid, Orange juice
B. Vinegar, Lime water, Sugar solution
C. Sodium hydroxide, Lemon juice, Baking soda
D. Tamarind juice, Salt solution, Soap solution
Answer : D

Question. On the basis of physical and chemical changes, find the odd one out.
P. Oxidation of a slice of brinjal
Q. Burning of magnesium ribbon
R. Crystallisation of copper sulphate
S. Corrosion of a metal
A. P
B. Q
C. R
D. S
Answer : C

Question. The given flowchart was prepared by Neelima for sorting materials into different groups. She handed over the chart to her teacher with few blanks. Fill in the blanks from the given options.

A. P-Butter, Q-Honey, R-Salt, S-Metal ball, T-Kerosene oil, U-Pencil
B. P-Salt, Q-Honey, R-Butter, S-Pencil, T-Kerosene oil, U-Metal ball
C. P-Salt, Q-Butter, R-Honey, S-Metal ball, T-Pencil, U-Kerosene oil
D. P-Pencil, Q-Honey, R-Butter, S-Salt, T-Kerosene oil, U-Pencil
Answer : B

Question. Which of the following changes does not require heat?
A. Wet clothes to dry clothes
B. Rolling out roti from a ball of dough
C. Baking of a cake
D. Expansion of metal rim
Answer : B

Question. Dilute hydrochloric acid is added to dilute sodium hydroxide as shown in the figure.

Which of the following is incorrect about the mixing of these substances?
I. There is no change in the arrangement of atoms.
II. On mixing the substances, two new products will be formed.
III. The word equation for the reaction is
Hydrochloric acid + Sodium hydroxide → Sodium chloride + Water
IV. The chemical reaction is called neutralisation and it is endothermic.
A. II and III
B. III and IV
C. I and II
D. I and IV
Answer : D

Question. Match the column I with column II and select the correct option from the given codes.
       Column I                             Column II
P. Ascorbic acid                      (i) Organic matter
Q. Indigestion                        (ii) Calamine solution
R. Ammonium hydroxide      (iii) Amla
S. Ant bite                             (iv) Milk of magnesia
T. Basic nature of soil           (v) Window cleaner
       P        Q         R        S        T
A. (iii)      (iv)       (v)       (i)       (ii)
B. (v)       (ii)       (iv)       (iii)     (i)
C. (ii)       (iii)       (v)       (i)      (iv)
D. (iii)      (iv)       (v)       (ii)     (i)
Answer : D

Question. A mixture contains three different substances P, Q and R. The properties of these substances are listed in the given table.

Which of the following sequence of methods will be suitable for separating each of the components from the mixture?
A. Filtration followed by evaporation
B. Churning followed by magnetic separation
C. Sedimentation-decantation and filtration followed by evaporation
D. Evaporation followed by winnowing
Answer : C

Question. Observe the given diagram carefully.

Y + Water → Z (Base)
X, Y and Z are respectively
A. Ca, CaO, Ca(OH)₂ white light
B. Mg, MgO, Mg(OH)₂
C. Na, Na₂O, NaOH
D. C, CO₂, H₂CO₃
Answer : B

Question. Refer to the given diagram of stomach of ruminant mammal with its parts labelled as P, Q, R and S and select the correct option.
A. The parts labelled P, Q, R and S are called reticulum, rumen, abomasum and omasum, respectively.
B. The part labelled Q is true stomach.
C. Food is completely digested in chambers P and R.
D. Digestion of cellulose takes place in P, S and R.
Answer : B

Question. Three tubes A, B and C, as shown in the figure, were left in sunlight for one hour. Each tube was provided with a bicarbonate indicator which is used to indicate the presence of carbon dioxide in aqueous solutions.
The indicator was red at the start of experiment.

Which of the following changes in the colour of indicator will be observed in the experiment?
A. Bicarbonate indicator will stay red in all the three tubes.
B. Colour of bicarbonate indicator in test tube C will change to yellow.
C. Colour of bicarbonate indicator in test tube A will change to purple.
D. Colour of bicarbonate indicator will change to purple in test tube B.
Answer : C

Question. Sheep are the major source of wool. During the production of wool from a sheep, it passes through several steps, such as scouring (P), drying (Q), dyeing (R), spinning (S), shearing (T) and carding (U).
Which of the following options shows the correct sequence of these steps?
A. T → P → Q → U → R → S
B. P → T → Q → R → U → S
C. U → P → R → Q → T → S
D. R → P → Q → T → S → U
Answer : A

Question. Read the given paragraph.
 W is a form of malnutrition in which nutrients are over supplied relative to amounts required for normal growth, development and metabolism. It leads to X .
Deficiency is another form of malnutrition. Deficiency of nutrients like protein leads to Y whereas deficiency of proteins and calories leads to Z .
Identify W, X, Y and Z and select the option that correctly fills the blanks in above paragraph

Answer : A

Question. Match the items given in column I with the items in columns II and III and select the correct option

      P          Q           R           S           T
A. b, 3       c, 4       a, 4        c, 5       a, 2
B. b, 2       c, 4       a, 1        b, 5       c, 3
C. b, 1       a, 4       c, 2        a, 5       c, 5
D. b, 2       a, 4       a, 3        b, 5       a, 5
Answer : B

Question. Which of the following food items are sources of sucrose, starch and cellulose respectively?
A. Meat, fruits and potatoes
B. Spinach, corn and meat
C. Table sugar, rice and grass
D. Fruits, eggs and wheat
Answer : C

Question. Various technical terms related to respiratory system of different organisms are hidden in the given word grid.

Which of the following is not present in the given word grid?
(i) The air tubes of insects.
(ii) Skeletal structure which protects the lungs.
(iii) The opening through which humans inhale air.
(iv) Small opening on the sides of the body of an insect.
(v) A flap like structure which covers the glottis at the time of swallowing in humans.
(vi) Respiratory organ of fish.
A. (i) and (ii) only
B. (ii), (v) and (vi) only
C. (iii) and (iv) only
D. (iv) and (v) only
Answer : D

Question. The diagrammatic representation shows the pulmonary and systemic circulations. Identify the parts labelled as a, b, c, and d and select the correct option.

A. a- Pulmonary artery, b- Pulmonary vein, c- Aorta, d- Vein
B. a- Pulmonary vein, b- Vein, c- Pulmonary artery, d- Aorta
C. a- Pulmonary vein, b- Aorta c- Vein, d- Pulmonary artery
D. a- Aorta, b- Vein, c- Pulmonary vein, d- Pulmonary artery
Answer : B

Question. Priya conducted an experiment as shown here

Select the correct statement regarding this.
A. Lime water in test tube B does not turn milky because potassium hydroxide solution absorbs the CO₂ from incoming air.
B. Lime water in test tube C turns milky as germinating seeds release CO₂ which enters test tube C.
C. Lime water in test tube B turns milky because germinating seeds release CO₂ into it.
D. Both A and B
Answer : D

Question. The given picture shows a camel with its different parts labelled as P, Q, R, S, T and U.

Which of the following statements is incorrect regarding its adaptations?
(i) Q is slit-like and has flap to prevent the entry of sand.
(ii) R is leathery for chewing thorny plants.
(iii) T is used for storing water.
(iv) S is sticky and webbed to prevent it from sinking into sand.
A. (i) and (iii) only
B. (ii) and (iv) only
C. (iii) and (iv) only
D. (ii) and (iii) only
Answer : C

Question. The given table shows the characteristics of four different seeds or fruits P, Q, R and S.

By which method P, Q, R and S get most likely dispersed?

Answer : C

Question. Read the given statements and select the correct option.
Statement 1 : The level of groundwater below the surface of the earth at a given place is known as the water table.
Statement 2 : Extensive use of groundwater in cities for domestic and industrial purposes is resulting in lowering of water table.
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. Both statements 1 and 2 are false.
Answer : B

Question. Study the given concept map and identify X, Y and Z.

Answer : B

Question. Refer to the given diagram of human skeletal system with various joints labelled as P, Q, R, S, T and U. Select the correct option regarding this.

A. Joints R, T and U move in one plane only.
B. Joints P, R and T move in more than one plane.
C. Joint P is an immovable joint.
D. Joints R, S and T move in more than one plane.
Answer : C

Question. Refer to the given food web.

Which of the following statements is incorrect regarding it?
A. In the given food web, P and W are producers.
B. The food web consists of more than five food chains.
C. In the given food web, R behaves both as primary consumer as well as secondary consumer.
D. In the given food web, T could be a deer or rabbit.
Answer : D

Question. The given diagram shows soil profile where different soil layers are labelled as P, Q, R and S.

Select the incorrect option regarding this.
A. P is rich in humus.
B. Few plant roots can reach Q.
C. R is saturated with moisture and represents water table.
D. S is a porous layer and consists of rock pieces with diameter less than 2 mm.
Answer : D

Question. Match column I with column II and select the correct option from the given codes.
    Column I                    Column II
P. Weaving       a. Process of making yarn from fibres
Q. Knitting        b. Spun from fibres and then used to make fabric
R. Ginning        c. A single yarn is used to make fabric
S. Spinning      d. Process of arranging two sets of yarns together to make a fabric
T. Yarn             e. Combing of cotton fibres to remove seeds
    P     Q     R    S    T
A. c     d     e     a     b
B. d     c     a     e     b
C. d     c     e     a     b
D. c     d     e     b     a
Answer : C

ACHIEVERS SECTION

Question. In a 100 m race, Gaurav and Sachin reached the finishing line at the same time. Which of the following are possible graphs to show that both competitors reached the finishing line at time t?

A. (i) and (ii) only
B. (i) and (iii) only
C. (ii) and (iii) only
D. (i), (ii) and (iii)
Answer : D

Question. Anamika has arranged the following experimental set-up to study the conditions necessary for rusting to take place.

Fill in the blanks with an appropriate option.
Both (i) and (ii) are essential for rusting. In test tube (iii) , the iron nail will rust faster. The process of depositing a layer of a metal like chromium or zinc on iron to prevent rusting is called (iv) .

Answer : B

Question. Raj is fond of gardening. He planted two different types of flowering plants, pea and papaya in his garden. Both the plants grew healthily in the garden and then flowered after sometime.
To check the fruit setting of these plants Raj covered the flowers of both plants using a polythene bag. After some days, he removed the polythene bags and found small pea fruits, but no fruits in papaya. What could possibly be the reason for this?
A. Papaya plant did not get essential nutrients for setting fruits and seeds.
B. Papaya plant has unisexual flowers and female flowers can produce fruits in presence of pollinators only.
C. The flower of pea plant gets converted to fruit without pollination and fertilisation.
D. Papaya plant is pollinated by insects whereas pea plant is pollinated by the agency of water
Answer : B

Question. Radha bought three different types of soil samples, P, Q and R from the market and then set-up an experiment as shown to test the suitability of these soils for making statue.

She put 50 gms of dry powdered soil of each sample separately in three different funnels placed over three different beakers and then slowly poured water on the soil samples till the water just started dripping from the funnel. She then weighed the three soil samples separately.
The results are shown in the given table

Which soil sample can she use for making statue?
A. P
B. Q
C. Both P and Q
D. Both Q and R
Answer : B

Question. The given graph shows changes in the pressure in lungs during breathing.

Which of the following is incorrect regarding this?
(i) Region R to T represents inhalation.
(ii) Region P to R represents inhalation.
(iii) Region P to R represents exhalation.
(iv) Ribcage will move upward and diaphragm will get flattened at point S.
(v) Ribcage will move downward and diaphragm will become dome shaped at point S.
A. (ii), (iii) and (v)
B. (i), (iii) and (iv)
C. (ii) and (v) only
D. (i) and (iii) only
Answer : C