CBSE Class 7 Science NSO Olympiad MCQs with Answers Set D

LOGICAL REASONING

Question. Three of the following four options are alike in a certain way based on their positions in the given arrangement and so form a group. Find the one that does not belong to that group.
B 4 @ D A © 7 9 F % 2 R 5 H 6 E * N $ 1 U W 3 P T 8 d V # Y I
A. 5 6 2
B. W P U
C. © 9 D
D. d # T
Answer : B

Question. There is a certain relationship on the either side of ::. Identify the relationship and find the missing term.
REASON : SFBTPO :: MAGNET : ?
A. NBHMFU
B. NBIPFS
C. NBHOFU
D. OCIPGU
Answer : C

Question. Which of the following figures do not satisfies the same condition of placement of dots as in Fig. (X)?

Answer : D

Question. Some boys are sitting in three rows all facing North such that S is in the middle row. P is just to the right of S. Q is just behind of P while R is in the North of S. In which direction of R is Q?
A. South
B. South-West
C. North-East
D. South-East
Answer : D

Question. Which of the following options will complete the pattern in Fig. (X)?

Answer : C

Question. Anu remembers that her friend had visited her after 13th but before 18th of the month, while Anu's sister remembers that Anu's friend had visited after 16th but before 20th. If it was Friday on 1st of the month, then on which day of the week, Anu's friend visit to her?
A. Saturday
B. Monday
C. Sunday
D. Friday
Answer : C

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

A. 66
B. 40
C. 61
D. 90
Answer : B

Question. Two positions of a dice are shown below.

When six is at the bottom, which number will be at the top?
A. 1
B. 2
C. 4
D. 5
Answer : D

Question. Select the term from the options which will continue the given series.
2B11, 4E13, 8H15, ? 
A. 15K17
B. 16K19
C. 16J17
D. 16K17
Answer : D

Question. Select the correct mirror image of the Fig. (X), if the mirror is placed vertically to the right.

Answer : A

SCIENCE

Question. Which of the following statements is/are true regarding the effects of using a thin converging lens instead of a thick converging lens?
(i) The image formed will be brighter.
(ii) The focal length will be longer.
(iii) The image formed will always be virtual.
A. (ii) only
B. (i) and (ii) only
C. (ii) and (iii) only
D. (i) and (iii) only
Answer : A

Question. A solid substance is placed in a boiling tube and heated steadily. The temperaturetime graph of the substance is shown in figure. At which labelled point would the substance be a mixture of liquid and gas?

A. 1
B. 2
C. 3
D. 4
Answer : D

Question. The distance-time graph of motion of a cycle is shown here. What is the average speed of cycle over a time period of 12 s?

A. 0.48 m s^–1
B. 0.58 m s^–1
C. 2.17 m s^–1
D. 3.17 m s^–1
Answer : B

Question. Two plane mirrors are placed at 90° to each other. A ray of light strikes one mirror and follows the path as shown in the figure.

What is the value of angle X?
A. 20°
B. 30°
C. 40°
D. 50°
Answer : D

Question. A piece of ice is being heated till it turns to water and then to steam. Which of the following statements is true?
A. The molecules expand as ice changes to steam.
B. The molecules move faster as ice changes to steam.
C. The molecules move closer to each other as ice changes to steam.
D. The intermolecular force of attraction increases as ice changes to steam.
Answer : B

Question. Which of the following statements about cyclone is/are incorrect?
(i) Cyclones are accompanied by very strong winds.
(ii) The centre of cyclone is a high pressure area.
(iii) Cyclones are known as typhoons in American continent.
(iv) There is heavy rain fall in the centre of cyclone.
A. (i) only
B. (ii) only
C. (i), (ii) and (iii) only
D. (ii), (iii) and (iv) only
Answer : D

Question. Which car, moving from rest, has an average acceleration of 2.0 m s^–2?
A. A car reaching a speed of 10 m s^–1 in 2 s.
B. A car reaching a speed of 20 m s^–1 in 5 s.
C. A car reaching a speed of 30 m s^–1 in 10 s.
D. A car reaching a speed of 40 m s^–1 in 20 s.
Answer : D

Question. Read the given statements and mark the correct option.
Statement 1 : Convex lens can form real and inverted images.
Statement 2 : Convex lens is used as magnifying glass.
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. Which coil will make the strongest electromagnet for a given flow of current?
A. A 10 cm coil with 100 turns.
B. A 5 cm coil with 200 turns.
C. A 10 cm coil with 200 turns.
D. A 20 cm coil with 200 turns.
Answer : B

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

A. (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
B. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
C. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
D. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
Answer : B

Question. Kanika identified the nature of few substances with the help of three different indicators. She listed down her observations in the given table with some blanks

Identify p, q, r and s
          p              q                  r                    s
A. Magenta    Green           Blue            Magenta
B. Red           Magenta       Blue            Green
C. Blue          Magenta       Red             Green
D. Green       Red               Magenta      Blue
Answer : B

Question. Mrs. Rama, a science teacher has arranged the following set-ups to demonstrate different types of changes

Identify the types of changes taking place in these set-ups.
A. In set-up 1, chemical-reversible change is taking place while in set-up 2, physical-irreversible change is taking place.
B. In set-up 1, chemical-irreversible change is taking place while in set-up 2, physical-reversible change is taking place.
C. In both set-ups, physical-reversible changes are taking place.
D. In both set-ups, chemical-irreversible changes are taking place.
Answer : B

Question. Four different substances are categorised based on their properties in the given flowchart.

Identify the substances.
A. P-Oil, Q-Common salt, R-Matchstick, S-Coin
B. P-Common salt, Q-Glycerine, R-Coin, S-Matchstick
C. P-Glycerine, Q-Common salt, R-Coin, S-Matchstick
D. P-Glycerine, Q-Sand, R-Coin, S-Matchstick
Answer : C

Question. Sahil took some iron filings and mixed them well with sulphur powder. He could separate the iron filings with the help of a magnet. Then, he heated the mixture for some time and tried to separate the iron filings with the magnet but he could not because
A. On heating, a chemical change takes place and a new compound is formed
B. On heating, a physical change takes place hence, iron and sulphur get mixed up
C. On heating, iron evaporates and only sulphur is left behind
D. None of these.
Answer : A

Question. Match the column I with column II and select the correct option from the given codes.
           Column I                               Column II
(i) Fast change                     (p) Occurrence of day and night
(ii) Periodic change              (q) Spoiling of food
(iii) Reversible change          (r) Blowing of a balloon
(iv) Undesirable change       (s) Dropping an object
    (i)      (ii)     (iii)     (iv)
A. p        s        q         r
B. r         q        p        s
C. s        p        r         q
D. q        r        s         p
Answer : C

Question. Which of the following methods can be used to separate each component of the mixture containing iron filings, chalk powder and sugar?
A. Evaporation, use of a magnet and separating funnel
B. Use of a magnet, filtration, followed by evaporation
C. Winnowing, filtration, followed by condensation
D. Handpicking, threshing, followed by evaporation
Answer : B

Question. Read the given statements and select the correct option.
Statement 1 : Calamine solution is applied on the skin when an ant bites.
Statement 2 : Ant injects ammonia into the skin which can be neutralised by rubbing with calamine solution.
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. Both statements 1 and 2 are false.
Answer : C

Question. Observe the given flowchart carefully and mark the option which best represents I, II, III and IV.

Answer : D

Question. Refer to the given table showing the characteristics of three types of fabrics (I, II and III).

Which of the following statements is incorrect regarding this?
A. Fabric I is more suitable for summer clothing.
B. Fabric II will allow more body heat to escape than fabric I.
C. Fabric III can neither absorb body sweat nor can keep the body cool.
D. Fabric II is more suitable for winter clothing.
Answer : B

Question. If the percolation rate of water through a soil sample is 50 mL/min, then how much time will 500 mL of water take to percolate completely into the soil?
A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 20 minutes
Answer : B

Question. Study the given experimental set-up, in which a burning candle has been placed in a beaker filled with water. The candle has been covered by an inverted glass jar.

Answer : D

Question. Refer to the given diagram which shows various parts of human digestive system labelled as I, II, III, IV and V.

Identify the organs and select the incorrect statement regarding them.
A. Organ V is involved in storage of bile not its production.
B. Organ II secretes digestive juice which contains mucus, hydrochloric acid and digestive enzymes.
C. Organ IV is the largest gland of the body.
D. Organ I is involved in the absorption of water from food.
Answer : D

Question. Which of the f o l lowing statements is correct regarding the given schematic of blood circulation in human body?

A. Structures P and S have thick, elastic walls to allow stretching.
B. P and R carry oxygenated blood.
C. Q carries deoxygenated blood at high pressure whereas S carries oxygenated blood at low pressure.
D. R and S have a series of valves and are superficially placed.
Answer : A

Question. Read the given statements and select the correct option.
Statement 1 : Chemical digestion of food involves breaking down of food by chewing and churning.
Statement 2 : Mechanical digestion of food involves conversion of complex substances such as carbohydrates into their simpler forms such as glucose by enzymatic action.
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 : D

Question. While using iodine in the laboratory, some drops of iodine fell on Rashmi’s socks and some fell on her teacher’s saree. The drops of iodine on the saree turned blue-black while the colour of iodine drop did not change on the socks. What can be the possible reason?
A. The socks were made of nylon while saree was made of silk.
B. The saree had been washed in starch solution to make it stiff.
C. The socks were black in colour while the saree was white in colour.
D. After washing, socks had been dipped in iodine solution before drying.
Answer : B

Question. Which of the following statements is incorrect for the given food web?

A. The snake is both a predator and a prey.
B. There is one producer and one omnivorous organism in this food web.
C. A decrease in population of frog will cause an increase in insect population.
D. There are three food chains in this food web.
Answer : D

Question. Refer to the given key.
I. (a) Fibres obtained from natural resources - Go to II (a)
(b) Fibres obtained from chemicals - Go to IV (b)
II. (a) Cellulose is the structural material - Go to III
(b) Fibres made up of complex proteins - Go to IV (a)
III. (a) Fibre obtained from seeds - P
(b) Fibre obtained from stems - Q
IV. (a) Poor conductor of heat and gives smell of burning hair when burnt - R
(b) Melts on burning - S
Identify P, Q, R and S and select the correct option regarding them.
A. P is the strongest natural fibre available.
B. Q is one of the cheapest fibre and is also known as golden fibre.
C. R can be obtained only by killing of source organism.
D. S provides the best clothing material for winter clothing.
Answer : B

Question. Refer to the given table.

Select the correct option for L, M and N.
         L                      M                             N
A. Present    Partially heterotrophic      Absent
B. Absent     Partially heterotrophic      Absent
C. Present    Autotrophic                      Present
D. Present    Partially parasitic             Absent
Answer : A

Question. Read the given paragraph.
Joints are of different types based on the degree of freedom of movement. The joints found between the skull bones are P joints. Joint Q is found between the skull and lower jaw. The joint between skull and first vertebra of backbone is R joint.
Select the correct option regarding these joints P, Q and R.
A. Joint P shows 180° of movement in two planes.
B. Joint Q shows 180° of movement in one plane.
C. Joint R shows 360° of movement in two planes.
D. Joint P shows 360° of movement in one plane.
Answer : B

Question. Anushka bagged four different kinds of flowers on the potted plants as shown below and left them undisturbed. Which of these four flowers is the most likely to produce fruits and seeds?

Answer : C

Question. Match column I with column II and select the correct option from given codes.
    Column I                       Column II
P. Anther             (i) Usually brightly coloured
Q. Pedicel          (ii) Contains pollen grains
R. Stigma          (iii) Stalk of the flower
S. Petals           (iv) Receives pollen grains
A. P – (iv), Q – (iii), R – (ii), S – (i)
B. P – (ii), Q – (iii), R – (iv), S – (i)
C. P – (ii), Q – (i), R – (iii), S – (iv)
D. P – (iii), Q – (iv), R – (i), S – (ii)
Answer : B

Question. Refer to the given flow chart.

Identify P, Q and R and select the correct option regarding it.
A. Deficiency of P can lead to diseases like kwashiorkor and marasmus.
B. If Q is water soluble then it is not stored in body but if it is fat soluble, it can be stored in body for future use.
C. Deficiency of R can lead to diseases like anaemia, goitre, rickets, etc.
D. All of these.
Answer : D

Question. Chitra wanted to see what body shape would enable an animal to travel most easily through the water. She cut out shapes using pieces of styrofoam and tied a piece of string to each of them. Then she pulled them through the fish pond in school. What factors should she keep the same so that the experiment is a fair one?
(i) The length of the string.
(ii) The size of the shaped-pieces.
(iii) The material used to make the string.
(iv) The material used to make the shaped-pieces.
(v) The strength with which she pulled each shapedpiece through the water.
A. (i), (ii) and (iii)
B. (i), (iii) and (iv)
C. (i), (iii), (iv) and (v)
D. (i), (ii), (iii), (iv) and (v)
Answer : D

Question. Study the following features :
• Flowers are small and dull.
• Pollen grains are light weight.
• Stamens and stigmas are exposed.
• Flowers are colourless and odourless.
• Pollen grains are produced in large numbers.
Above cited features are the characteristics of flowers in which pollination is brought about by the agency of
A. Wind
B. Birds
C. Insects
D. Explosion.
Answer : A

Question. Which of the following best describes what happens to the parts X and Y during inhalation and exhalation ?

                      ​​​​​​​Inhalation            ​​​​​​​           ​​​​​​​Exhalation

Answer : C

ACHIEVERS SECTION

Question. The diagram shows an electric bell. Which materials would be suitable for the parts labelled X, Y and Z?

Answer : B

Question. Observe the given figure carefully and fill in the blanks by choosing an appropriate option.

Answer : C

Question. Read the given passage.
Sometimes during heavy physical exercise, your body cannot get enough P to produce the required energy. To get the additional energy, Q respiration occurs in your R , during which partial breakdown of glucose occurs and S is produced.
Which of the following statements is incorrect regarding P, Q, R and S?
A. P represents oxygen.
B. Q is the type of respiration that occurs in the presence of oxygen.
C. R represents muscle cells of our body.
D. Accumulation of S in muscles causes muscular cramps.
Answer : B

Question. The given graph shows the variations in oxygen release and uptake by a plant over a period of 10 hours.

Select the correct statement regarding this.
A. For first three hours, the plant was kept in a dark room.
B. At 3rd hour, the plant was moved to a sunny place.
C. For first 3 hours, the plant was photosynthesising but was not respiring.
D. Both A and B
Answer : D

Question. Read the given passage.
The land near the equator is colder than the land away from it. Near the equator, Sun's rays fall vertically. As the latitude increases, the rays become more and more slanting. Vertical rays spread over a larger land area than slanting rays. Also, they pass through a thicker layer of the atmosphere which absorbs a large part
of their heat. Hence, the land near the equator gets  eated up lesser by the sun than the land away from it, in a given time.
Some of the words have been italicised in the given passage. Select the incorrect statement regarding these.
A. The words colder and lesser need not to be replaced
as they are correctly mentioned.
B. Larger should be replaced by smaller.
C. Thicker should be replaced by thinner.
D. None of these
Answer : A