CBSE Class 6 Science NSO Olympiad MCQs with Answers Set N

SCIENCE

Question. Avin tied a small stone to one end of a string that he had. Then he held the other end of the string and started whirling it, initially slowly, then faster and faster. Which of the following statements is incorrect?

A. The stone always undergoes circular motion.
B. The distance of the stone from Avin's hand keeps changing.
C. The stone undergoes non-periodic motion.
D. Both B and C.
Answer : B

Question. Match the column I with column II and select the correct option from the given codes.
   Column I           Column II
P. 150 dm            1. 1.5 m
Q. 150 mm          2. 150 m
R. 0.15 km          3. 15 m
S. 150 cm           4. 0.15 m
A. P - 3, Q - 4, R - 1, S - 2
B. P - 4, Q - 3, R - 2, S - 1
C. P - 3, Q - 4, R - 2, S - 1
D. P - 4, Q - 3, R - 1, S - 2
Answer : C

Question. Manu has three identical roses but of different colours; red, yellow and white. She shines a torch on the three roses in turn and gets a shadow on the wall in each case. Deepak who is observing the shadows formed on the wall can
A. Distinguish shadow of red rose only.
B. Distinguish shadows of red and yellow roses only.
C. Distinguish shadows of all the three roses.
D. Never distinguish the shadows of three roses.
Answer : D

Question. The given figure shows a light bulb connected to a cell.
Which of the following shows the energy changes that take place when a bulb glows?

A. Chemical energy → electrical energy → heat energy → light energy
B. Chemical energy → electrical energy → light energy → heat energy
C. Electrical energy → chemical energy → light energy → heat energy
D. Electrical energy → chemical energy → heat energy → light energy
Answer : A

Question. Two identical metal bars P and Q are positioned as shown in the two diagrams. If there is a strong attraction in figure (i) and weak attraction in figure (ii), what are the possible materials for P and Q?

         P                      Q
A. Steel bar          Steel bar
B. Steel bar          Bar magnet
C. Bar magnet      Steel bar
D. Bar magnet      Bar magnet
Answer : C

Question. Which of the following statements are correct?
(i) Wheels of a car moving at a constant speed undergo linear, rotational as well as periodic motion.
(ii) A hockey player running after the ball during a match undergoes linear and periodic motion.
(iii) The pendulum of a clock undergoes periodic and oscillatory motion.
A. (i) and (ii) only
B. (ii) and (iii) only
C. (i) and (iii) only
D. (i), (ii) and (iii)
Answer : C

Question. In the given figure, which of the following switches need to be closed to change electrical energy to sound energy only?

A. P, Q and R
B. P, R and T
C. P, Q, R and T
D. P, Q, S and T
Answer : B

Question. Read the given statements and select the correct option.
Statement 1 : Rubber and plastic are used for covering electrical wires, plug tops and switches.
Statement 2 : Rubber and plastic are insulators.
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 : A

Question. Salman has ten 1 rupee coins. He makes a stack of those ten coins and measures the length of the stack using a scale as shown in the figure.

What is the thickness of one coin?
A. 1.1 mm
B. 1.5 mm
C. 2.1 mm
D. 2.5 mm
Answer : C

Question. Which of the following are possible results when a steel bar is being magnetised by the stroking method?

A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2 and 3
Answer : D

Question. Which of the following options shows the correct mirror image of the word ‘SHADOW’ in the given cases (i) and (ii) respectively?

Answer : D

Question. The shadow below a tree has bright spots in it because ________.
A. Leaves attract light
B. The light bends around the leaves to form circular spots
C. The gaps between the leaves act as pin holes
D. Leaves reflect light
Answer : C

Question. Which of the following observations confirms that an object is a magnet?
A. The object is attracted by a strong bar magnet.
B. The object causes a compass needle to move.
C. The object rotates before being attracted to a bar magnet.
D. The object is attracted to both poles of a horseshoe magnet.
Answer : C

Question. Ritika, a science teacher prepared the following flowchart and asked the students to fill in the blanks.

Mark the correct option.
      I                II            III           IV
A. a, g        b, d, h        f            c, e
B. a, c        d, g            e, h        b, f
C. e, g        b, d, h        f            a, c
D. e            b, c, d        f, h        a, g
Answer : C

Question. Match the column I with column II and select the correct option from the given codes.

A. (p) - (v), (q) - (iv), (r) - (iii), (s) - (ii), (t) - (i)
B. (p) - (i), (q) - (iv), (r) - (iii), (s) - (ii), (t) - (v)
C. (p) - (iii), (q) - (i), (r) - (v), (s) - (iv), (t) - (ii)
D. (p) - (v), (q) - (iv), (r) - (ii), (s) - (iii), (t) - (i)
Answer : D

Question. Ram, a class 6 student observed different types of changes and tabulated them in the given table.

Which of the given observations are incorrect?
A. 1, 4 only
B. 2, 3 and 5 only
C. 2 and 3 only
D. 2 and 5 only
Answer : C

Question. One gram of salt is added to each of the following beakers containing water at different temperature conditions.

Which of the following represents the decreasing order of the time taken by the salt to dissolve completely?
A. P < S < Q < R
B. R < Q < P < S
C. P > S > Q > R
D. Q > R > P > S
Answer : C

Question. Four substances P, Q, R and S are mixed in a beaker containing water. The properties of these substances are listed in the given table.

Which of the following methods of separation should be used in sequence to obtain substance S from the mixture?
A. Filtration, evaporation followed by magnetic separation.
B. Separating funnel followed by churning.
C. Filtration followed by magnetic separation.
D. Sedimentation and decantation followed by evaporation.
Answer : C

Question. Mansi listed the four groups of different objects in the given table.

The correct property according to which these substances are categorised into different groups is in
I. Group 1 : Lustrous metals
II. Group 2 : Softness
III. Group 3 : Made up of paper
IV. Group 4 : Edible and insoluble in water
A. I and III only
B. II and IV only
C. I and II only
D. III and IV only
Answer : A

Question. Study the given Venn diagram.

Centre point (•) represents
1. Rusting of a bicycle
2. Breaking of glass vase
3. Blowing of a balloon
4. Hot milk to cold milk
A. 1, 2 and 4 only
B. 3 and 4 only
C. 2, 3 and 4 only
D. All of these.
Answer : B

Question. Find the incorrect match.
A. Butter paper–translucent
B. Air–transparent
C. Steel glass–opaque
D. Wooden door–transparent
Answer : D

Question. The properties of four different solids are listed in the given table.

A mixture containing two of the given solids is added to excess water, stirred and filtered as shown in the given figure.

The mixture contains
A. P and S
B. Q and R
C. P and R
D. Q and S
Answer : B

Question. A bottle containing ink and a straw is sealed properly and placed in a pan of very hot water. After some time, a fountain is seen as shown in the given figure :

This is due to
A. contraction of liquid on cooling
B. expansion of liquid on cooling
C. expansion of liquid on heating
D. contraction of liquid on heating
Answer : C

Question. Which of the following statements is incorrect?
A. Milk, vinegar and lemon juice are miscible in water while oil and paint are immiscible in water.
B. Steel and copper are good conductors of heat whereas wood and rubber are bad conductors of heat.
C. Allpin floats while cork sinks in water.
D. None of these.
Answer : C

Question. Which of the following are non-periodic changes?
I. Sunrise and sunset
II. Growth of plants
III. Occurrence of a rainbow
IV. Beating of heart
A. II and III only
B. II and IV only
C. I and IV only
D. All of these.
Answer : A

Question. Given below are three statements (a-c) each with one or two blanks. Select the option which correctly fills up the blanks in any two statements.
(a) Scurvy is a deficiency disease caused by the lack of (i) in diet.
(b) (i) is required for normal growth of bones. Our body can make it when the skin is exposed to (ii) .
(c) Blood contains (i) , deficiency of which causes a disease called (ii) , in which a person looks pale and gets tired easily.
A. (a) - (i) Vitamin A
(b) - (i) Vitamin C, (ii) Heat
B. (b) - (i) Vitamin B, (ii) Sunlight
(c) - (i) Iron, (ii) Rickets
C. (a) - (i) Vitamin D
(c) - (i) Iron, (ii) Anaemia
D. (a) - (i) Vitamin C
(b) - (i) Vitamin D, (ii) Sunlight
Answer : D

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

A. Q refers to vitamin B-complex.
B. Our body can synthesise R and P hence we need not to include them in our diet.
C. P is obtained from citrus fruits like lemon, orange etc.
D. Deficiency of P leads to rickets whereas deficiency of R leads to beri-beri.
Answer : C

Question. Which of the following statements is correct?
A. Scales in frogs help them to move easily through water.
B. The eyes on the sides of the head of a lion allow it to have a correct idea about the location of its prey.
C. Leaves of submerged aquatic plants are usually narrow and do not possess stomata.
D. In desert plants, roots are poorly developed and are of secondary importance.
Answer : C

Question. Which of the following statements is correct with respect to the movement in the animal shown in the given figure?

A. The slippery movement of foot caused due to contraction of its muscles helps the animal in its loco-motion.
B. It moves fast in a zig zag manner.
C. It moves with the help of a series of muscular rings present all along its body.
D. The forelimbs help to push its body forward while the hind limbs help to push its body backward.
Answer : A

Question. The given Venn diagram represents some plants (P, Q, R and S) based on their edible parts. Select the incorrect option regarding this.

A. P-Cumin, R-Fenugreek
B. P-Rice, Q-Apple
C. R-Coriander, Q-Tomato
D. Q-Sugarcane, S-Cabbage
Answer : D

Question. Collecting rainwater and storing it for later use is called rainwater harvesting. Which of the following statements are not true for the technique of rooftop rainwater harvesting?
(i) Rainwater is allowed to go down the roadside drains.
(ii) Rainwater from roof top is collected in storage tanks.
(iii) The collected rainwater needs to be filtered as it contains soil.
(iv) This practice reduces the amount of ground water available to us.
A. (i) and (ii) only
B. (ii) and (iii) only
C. (iii) and (iv) only
D. (i) and (iv) only
Answer : D

Question. Refer to the given figure with its parts labelled as P, Q, R and S.
Which of the following statements are correct regarding this?

(i) Plants like carrot, radish and turnip store their food in R.
(ii) Q and P are modified into tendrils in plants like grapevine and Gloriosa respectively, to help them give support.
(iii) In cactus and aloe vera P is reduced to spines and Q stores water and mucilage.
(iv) In onion and beetroot, S and Q are modified respectively to store food.
(v) In ginger and potato, Q is underground and modified to store food.
A. (i), (ii) and (iii) only
B. (i), (ii) and (v) only
C. (iii) and (iv) only
D. (iii), (iv) and (v) only
Answer : B

Question. Refer to the given dichotomous key.
I. (a) It is a natural fibre. - Go to II
(b) It is a synthetic fibre. - P
II. (a) It is obtained from plants. - Go to III
(b) It is obtained from animals. - Go to IV
III. (a) It is obtained from seeds of plants. - Q
(b) It is obtained from stems of plants. - R
IV. (a) It is obtained from hair of some animals. - S
(b) It is obtained from non-feeding stage of an insect. - T
Select the incorrect option regarding P, Q, R, S and T.
A. Clothes made purely of P do not wrinkle easily and also cannot absorb sweat.
B. Q can be best suited for summer clothing as it absorbs sweat and breathes well.
C. R can be obtained by retting of jute stems and is used for making carpets, ropes, etc.
D. T was first developed in Africa whereas India is the leading producer of S.
Answer : D

Question. Study the given classification chart of plant fibres.

Which of the following holds true for P, Q, R and S?
A. P could be flax or jute.
B. P and Q are biodegradable whereas R and S are non-biodegradable.
C. Q could be coir whereas S could be sisal.
D. Both A and C
Answer : D

Question. Read the given statements and select the correct option.
Statement I : Jute is used to make containers for young saplings that can be planted directly.
Statement II : Jute cannot be easily decomposed by microorganisms.
A. Both statements I and II are true and statement II is the correct explanation of statement I.
B. Both statements I and II are true but statement II is not the correct explanation of statement I.
C. Statement I is true but statement II is false.
D. Both statements I and II are false.
Answer : C

Question. The given figure is the cross-section of a lady's finger fruit. Identify (i) the parts labelled 'X' and (ii) the parts of the flower from where they have been developed.

        (i)                (ii)
A. Pollen          grains
B. Seeds          Ovules
C. Ovules         Ovary
D. Seeds          Stigma
Answer : B

Question. Study the given classification chart showing two types of skeletal joints (P and Q). Which of the following statements is correct regarding these?

A. Joint P is also present between vertebrae.
B. Joint Q is also present between bones of fingers.
C. Joint P allows movement in all directions whereas joint Q allows sideways movements only.
D. In joint Q, round end of one bone fits into hollow part (socket) of another bone.
Answer : D

Question. Study the given flow chart that shows some ways of garbage disposal

Which is the best way to dispose the types of wastes listed below?
a. Vegetable peels
b. Tea leaves
c. Animal excreta
d. Used needles and syringes
e. Newspapers
f. Polybags
g. Cold-drink cans
        P               Q             R
A. e, g           a, b, c        d, f
B. e, f, g        a, c            b, d
C. a, e           b, c, d        f, g
D. d, e, f        a, g           b, c
Answer : A

Question. Read the given statements each with one or two blanks. Select the option that correctly fills any three of these blanks.
(a) Pea and tulsi have __(_i) _ root systems whereas maize and barley have __(ii) _ root systems.
(b) __(iii) _ roots are pillar like supportive roots that grow downwards from branches of trees and fix themselves in soil.
(c) __(iv) _ venation is found in rose whereas __(v) _ venation is found in wheat
(d) __(_v_i)__ is modified in cactus to perform photosynthesis whereas it is modified in ginger to __(vii) _.
A. (i) - Tap, (iii) - Prop, (vii) - Store food
B. (ii) - Fibrous, (iv) - Parallel, (vi) - Root
C. (i) - Fibrous, (iv) - Parallel, (v) - Reticulate
D. (ii) - Tap, (iii) - Stilt, (vi) - Stem
Answer : A

Question. Which of the following cannot be interpreted from the given figure?

A. Some plant parts have a tendency to bend towards light.
B. Plants show response to environmental stimuli.
C. Roots of the plants have a tendency to move away from light.
D. Plants possess the characteristics of living organism.
Answer : C

Question. Study the given Venn diagram that classifies three animals based on their features.

Which of the following is incorrect for X, Y and Z?
A. X could be a predator like tiger or a prey like stick insect.
B. Y could be a polar bear.
C. Z could be a lizard.
D. Organism Z is always cold blooded.
Answer : D

Question. Rohan conducted an experiment as shown here.

What could be the reason for the rise in the level of coloured liquid in the capillary within the test tube in step II?
A. When test tube was placed in hot water bath, air present within the test tube expanded due to heat.
B. When test tube was placed in hot water bath, air present within the test tube contracted due to heat.
C. Water in the bath contracted due to placement of air-filled test tube in it.
D. None of these
Answer : A

Question. 'X' is a gas which is required by producers to prepare their food. Select the incorrect statement regarding 'X'.
A. It constitutes 0.03% of air in atmosphere.
B. It turns lime water milky.
C. It is an important component of fertilisers.
D. It extinguishes fire.
Answer : C

Question. Organism X has liquid skeleton. Organism Y has a calcareous exoskeleton and organism Z has endoskeleton made up of bones.
Which of the following holds true for X, Y and Z?
A. X could be a snake or an earthworm.
B. Y could be a snail or an oyster.
C. Z could be a bird or a starfish.
D. Y could be a cockroach or a frog.
Answer : B

Question. The given graph represents how three different living organisms (X, Y and Z) cope with the external environmental conditions.
Study the graph and select the correct option regarding X, Y and Z.

A. X could be a mammal.
B. Y could be a bird.
C. Z could be a mammal.l
D. X could be a bird.
Answer : B

ACHIEVERS SECTION

Question. The given figure shows a pole fixed in the centre of a garden. Four students observed the shadow formed by the pole for different time intervals and then plotted the graph of height of shadow (in cm) vs their observation time, as shown here

Which of the following graphs show(s) correct observations?
A. III only
B. IV only
C. II and IV only
D. I, II and III only
Answer : B

Question. Amit, Rahul and Naveen were given three glass slides I, II and III respectively and a white paper with a cross mark (×). Amit painted his glass slide with a light blue colour. Rahul painted his glass slide with a black paint and Naveen left his slide as it is. They put each of these slides over the mark.

Fill in the blanks by choosing an appropriate option. Slide I is __(p) _, slide II is __(q) _ and slide III is __(_r) _.
          (p)                        (q)                   (r)
A. transparent          translucent         opaque
B. translucent          transparent         opaque
C. translucent          opaque               transparent
D. opaque               translucent          transparent
Answer : C

Question. Refer to the given figure and select the incorrect statement regarding its labelled parts.

A. If 'T' is removed at bud stage of flower, chances of damage to floral organs is increased.
B. Pollination involves the transfer of pollen grains from 'Q' to 'P'.
C. Function of 'S' is to receive the pollen grains during pollination.
D. 'R' is usually brightly coloured and helps in pollination.
Answer : C

Question. Read the given paragraph where few words have been italicised.
Rain is our main source of water. Water vapours present in the air precipitate to form clouds. When rain falls, some of it condenses back to atmosphere and some passes through the soil upto the level of non-porous rocks beneath to form groundwater. Groundwater may come out at some places to form water table.
Select the incorrect option regarding this.
A. Precipitate should be replaced with condense.
B. Condenses should be replaced with evaporates.
C. Groundwater should be replaced with run-off.
D. Water table should be replaced with spring.
Answer : C

Question. Study the given food web and select the correct option regarding P, Q, R, S and T.

A. Q is acting as both producer and consumer.
B. There are four food chains in the given food web.
C. More energy is passed from organism S to organism T than from organism R to organism T.
D. Q and T compete with each other for food as they have common preys.
Answer : B