CBSE Class 7 Science NSO Olympiad MCQs with Answers Set J

LOGICAL REASONING

Question. There are six children P, Q, R, S, T and U playing football. P and T are brothers. U is the sister of T. R is the only son of P’s uncle. Q and S are the daughters of the brother of R’s father. How many female players are there?
A. 1
B. 2
C. 3
D. 4
Answer : C

Question. Choose the box that is similar to the box formed when the given sheet is folded.

Answer : B

Question. Select a figure from the options in which the given figure is exactly embedded as one of its parts.

Answer : A

Question. In a coding language, the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 are substituted by a, b, c, d, e, f, g, h, i and j. If 10 is written as ba, then (cd + ef) × bc is equal to _________.
A. 684
B. 816
C. 916
D. 1564
Answer : B

Question. Select a figure from the options which will complete the given figure matrix.

Answer : B

Question. In the English alphabetical series, if A interchanges its position with B, C with D, E with F and so on up to Y and Z, then _______ will be the seventh letter from the right end.
A. S
B. T
C. G
D. H
Answer : A

Question. Select a figure from the options which does not satisfy the same condition of placement of the dots as in the given figure.

Answer : A

Question. Find the correct mirror image of the given figure.

Answer : A

Question. Select the option which will continue the given series.
A50G, I306O, Q818W, Y650E, ?
A. H245J
B. G245M
C. G218M
D. M218G
Answer : C

Question. Kirti walks 10 km towards North. From there, she walks 6 km towards South. Then, she walks 3 km towards East. How far and in which direction is she now with respect to her starting point?
A. 5 km North-West
B. 7 km South-West
C. 7 km West
D. 5 km North-East
Answer : D

SCIENCE

Question. A person is running along a circular track of area 625 p m² (p = 22/7) with a constant speed. Find the displacement in 15 seconds if he has to complete the race in 30 seconds.
A. 200 m
B. 100 m
C. 25 m
D. 50 m
Answer : D

Question. The diagram shows a ray of light striking a plane mirror.

What is the angle of incidence if the angle between the incident ray and the reflected ray is 80°?
A. 35°
B. 40°
C. 70°
D. 80°
Answer : B

Question. In the given experimental set-up, when a magnet was brought near the side of the beaker, it attracted some of the nails.

What does this experiment show?
I. The nails are magnets.
II. The nails are made of magnetic materials.
III. Magnetism can only pass through the glass container.
IV. Magnetism can pass through sand, water and glass.
A. I only
B. II and III only
C. III only
D. II and IV only
Answer : D

Question. How do we check whether an electromagnet is working?
I. Check if it can repel glass.
II. Check to see whether it conducts heat easily.
III. Place some paperclips near it.
A. I only
B. III only
C. I and II only
D. II and III only
Answer : B

Question. Which of the following diagrams represents a short circuit?

Answer : B

Question. Rohan set up an experiment as shown here.

He placed the lighted candle below the metal rod at position M. He used the same amount of wax to hold all the thumbtacks at positions W, X, Y and Z on the
rod. Arrange the thumbtacks according to the time they take to drop from the rod, from the first to the last.
A. Y, X, W, Z
B. Y, X, Z, W
C. X, Y, W, Z
D. W, Z, Y, X
Answer : B

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

A. P - (iv), Q - (iii), R - (i), S - (ii)
B. P - (iii), Q - (iv), R - (ii), S - (i)
C. P - (iii), Q - (iv), R - (i), S - (ii)
D. P - (iv), Q - (iii), R - (i), S - (ii)
Answer : C

Question. Read the given statements and select the correct option.
Statement 1 : The colour of the shadow of an object depends on the colour of the object.
Statement 2 : Shadow is the dark patch formed when an object obstructs the path of light.
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 : D

Question. In the set-up shown here, the bulb has lighted up.

Which of the following statements about liquid X is/are correct?
I. Liquid X is a good conductor of electricity.
II. Liquid X is able to produce electricity.
III. Liquid X is not a good conductor of electricity.
A. I only
B. II only
C. III only
D. I and II only
Answer : A

Question. If the time taken by the bob of a pendulum to move from point R to P is 4 s, then the time taken by it to complete its one oscillation is

A. 8 s
B. 12 s
C. 16 s
D. 4 s
Answer : C

Question. Read the given statements and select the correct option.
Statement 1 : Electrolysis of water is a displacement reaction.
Statement 2 : Water gets broken down to form hydrogen and oxygen.
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 and statement 2 is true.
D. Both statements 1 and 2 are false.
Answer : C

Question. Kanika has taken a few objects in a beaker as shown in the given figure.

She added water into the beaker until it was half filled.
Which of the objects in the beaker will move upto the water surface ?
A. 2 only
B. 2 and 4 only
C. 3 and 4 only
D. 1 and 3 only
Answer : B

Question. Seema conducted an experiment to test the nature of four different samples. She noted down her observations in the given table.

Which of the following conclusions can be drawn from this experiment?
A. W and Z are basic, X is acidic and Y is neutral in nature.
B. W is acidic, X is basic, Y and Z are neutral in nature.
C. W and Z are acidic, X is basic and Y is neutral in nature.
D. Y is neutral, W and X are basic and Z is acidic in nature
Answer : A

Question. Find the incorrect match

Answer : B

Question. Study the given Venn diagram.

Centre point ‘X’ represents
A. Eruption of volcanoes
B. Burning of paper
C. Rusting of bicycle
D. Ripening of guava.
Answer : D

Question. Given figure shows the colour changes when China rose indicator is added in test tubes I, II and III. Identify the solutions present in test tubes I, II and III.

Answer : D

Question. Match column I with column II and select the correct option from the given codes.
   Column I                          Column II
P. Fast change                 (i) Crystallisation
Q. Periodic change          (ii) Earthquake
R. Reversible change      (iii) Bursting of crackers
S. Undesirable change    (iv) Change of season
A. P-(iii), Q-(iv), R-(ii), S-(i)
B. P-(iii), Q-(iv), R-(i), S-(ii)
C. P-(i), Q-(iii), R-(iv), S-(ii)
D. P-(iv), Q-(ii), R-(iii), S-(i)
Answer : B

Question. Which of the following groups of acids contains only weak organic acids?
A. Acetic acid, Formic acid, Nitric acid
B. Acetic acid, Ascorbic acid, Formic acid
C. Hydrochloric acid, Sulphuric acid, Formic acid
D. Citric acid, Lactic acid, Sulphuric acid
Answer : B

Question. Refer to the given food chain.

Identify P-T and select the incorrect statement.
A. All the organisms of the food chain depend on P directly or indirectly for food.
B. Q and R in the given food chain are herbivore and carnivore respectively.
C. T helps in keeping our environment clean and in recycling of nutrients.
D. S obtains its food directly from the plants and is called primary consumer.
Answer : D

Question. Refer to the given figure.

Select the correct statement regarding processes X, Y and Z.
A. Unisexuality of flowers prevents processes X and Y.
B. Seed setting is assured in process X even in the absence of pollinators.
C. Processes X and Z are not possible in cucurbits and papaya.
D. In processes Y and Z, genetically different pollen grains are brought to stigma.
Answer : B

Question. Refer to the given Venn diagram.

Identify P and Q and select the correct statement.
A. Q produces a juice which gets mixed with fats present in food and converts it into small fat droplets.
B. Q secretes a digestive juice which acts on carbohydrates, fats and proteins and converts them into glycerol, fatty acids and amino acids, respectively.
C. P could be the smallest organ of digestive system whereas Q could the longest portion of alimentary canal.
D. P absorbs water and salt from undigested food whereas Q is the site of absorption of digested food.
Answer : A

Question. Study the given table.

Identify P, Q, R and S and select the incorrect option regarding them.
A. P can be treated by consumption of green leafy vegetables, red meat, etc., whereas R can be treated by consuming sea food, iodised salt, etc.
B. In P, oxygen carrying capacity of blood is reduced whereas R is characterised by enlargement of thyroid gland.
C. Our body can manufacture Q in the presence of sunlight whereas S is present in citrus fruits like amla, lemon, etc.
D. All of these
Answer : C

Question. Refer to the given figures.

Identify P-R and select the correct option.
A. R is the non-feeding stage of silk moth.
B. The salivary glands of the insect at only P stage secrete fibres made of proteins.
C. Q undergoes moulting four times to become an adult and feeds on mulberry leaves.
D. Both A and C
Answer : D

Question. The given graph shows rates of heartbeat in Mr X and Mr Y.

Select the incorrect option regarding this.
A. Mr X may be doing some exercise due to which his heartbeat rate has increased in order to supply more oxygen to his body cells.
B. Mr Y is in deep sleep state so his body cells do not require any oxygen hence his heartbeat rate has gradually reduced to 0.
C. Mr X may be watching some scary movie which has triggered stress and has increased his heartbeat rate.
D. None of these
Answer : B

Question. Consider the following statements. Select the option which correctly identifies true (T) and false (F) ones.
(i) Microorganisms act upon the dead plants to produce humus.
(ii) Autotrophs lie at the base of a food chain.
(iii) Large scale cutting of trees is called afforestation.
(iv) Branched part of a tree above the stem is called crown.
   (i)      (ii)    (iii)   (iv)
A. T       F       T       F
B. T       T       F       T
C. T       F       F       T
D. T       F       T       T
Answer : B

Question. Refer to the given flow chart and select the option which correctly identifies P, Q and R.

Answer : D

Question. Observe the given figure and select the correct statement(s) regarding P-S.

(i) The given figure shows the process of pollination.
(ii) P secretes sugary solution which stimulates the germination of R.
(iii) Male gametes are formed inside the Q.
(iv) S contains fertilised ovule which contains zygote.
A. (i) and (iii) only
B. (ii), (iii) and (iv) only
C. (i), (ii) and (iv) only
D. (iv) only
Answer : D

Question. Read the given characteristics of a fibre.
(i) It is a natural fibre.
(ii) It is a bad conductor of heat so it remains cool in summer and warm in winter.
(iii) It has a unique natural lustre and the fabric is very smooth.
(iv) It is a proteinaceous fibre.
Fibre X could be
A. Nylon
B. Silk
C. Cotton
D. Polyester.
Answer : B

Question. Match column I with column II and select the correct option from the given codes.
     Column I                   Column II
P. Earthworm         (i) Pulmonary respiration
Q. Human              (ii) Branchial respiration
R. Prawn                (iii) Tracheal respiration
S. Insects               (iv) Cutaneous respiration
A. P-(i), Q-(ii), R-(iii), S-(iv)
B. P-(iv), Q-(i), R-(ii), S-(iii)
C. P-(iii), Q-(ii), R-(iv), S-(i)
D. P-(iv), Q-(ii), R-(i), S-(iii)
Answer : B

Question. Study the given table. Identify X and Y and select the correct statement.

A. X could be hibernation exhibited by polar bear whereas Y could be migration exhibited by penguin.
B. X could be hibernation exhibited by polar bear whereas Y could be aestivation exhibited by salamander.
C. X could be aestivation exhibited by tortoise whereas Y could be hibernation exhibited by penguin.
D. X could be migration exhibited by hedgehog whereas Y could be aestivation exhibited by snakes.
Answer : B

Question. Refer to the given experimental set-up.

Answer : A

Question. The given bar chart shows the concentration of oxygen in blood samples from four places in the circulatory system of a man. Which sample was taken from the pulmonary artery?

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

Question. Observe the given figure of blood smear prepared by a lab professional.

Identify cells X, Y and Z and select the correct statement.
A. X produces special protein substances called antibodies that protect us from infection.
B. Reduction in number of Y leads to excessive loss of blood from the wound.
C. The count of Z goes down when there is any infection in the body.
D. Both B and C.
Answer : B

Question. Refer to the given flow chart.

Select the correct statement regarding P-S.
A. P could be potato whereas Q could be clove.
B. S could be sugarcane whereas R could be ginger.
C. P could be garlic whereas S could be cocoa.
D. R could be turnip whereas Q could be cumin.
Answer : B

Question. Select the correct match.

Answer : C

ACHIEVERS SECTION

Question. Observe the given figures carefully

Read the given passage and fill in the blanks by selecting an appropriate option.
Figures 1 and 2 both represent a (i) change. In figure 1, P is (ii) and Q is (iii) . In figure 2, X and Y can be (iv) and (v) respectively

Answer : B

Question. Study the given flow chart carefully and select the option that correctly identifies P, Q and R.

A. P could be any parasitic leafless plant such as mistletoe which depends on the host plant for water and minerals.
B. R could be Dionaea which has special leaf modification to catch and digest insects.
C. Q could be Cuscuta which is rootless photosynthetic plant.
D. All of these
Answer : B

Question. A speed-time (v-t) graph of an object is shown in the figure.

Which of the following best describes the graph?
A. The object travels at decreasing acceleration.
B. The object travels at constant deceleration.
C. The object travels at increasing deceleration.
D. The object travels at decreasing deceleration.
Answer : C

Question. Refer to the given dichotomous key and select the incorrect statement regarding P-T.
I. (a) The plant undergoes vegetative propagation. - Go to II
(b) The plant undergoes sexual reproduction. - Go to III
II. (a) The plant propagates vegetatively by stem. - P
(b) The plant propagates vegetatively by leaf. - Q
III. (a) Its seeds are dispersed through abiotic agent. - Go to IV
(b) Its seeds are dispersed through animals. - R
IV. (a) Its seeds are dispersed through wind. - S
(b) Its seeds are dispersed through water. - T
A. P could be Eichhornia that propagates through offsets or Oxalis that propagates through runners. 
B. Q could be Bryophyllum whereas R could be Urena.
C. R could be Hiptage whereas S could be Balsam.
D. S could be Dandelion whereas T could be lotus.
Answer : C

Question. Refer to the given graph representing percentage of undigested starch in different parts of alimentary canal. Identify regions of alimentary canal P – S and select the correct statement.

A. P could be mouth, Q could be oesophagus, R could be stomach and S could be small intestine.
B. Digestion of food is completed in R which also possesses many finger-like projections in its wallthat provide a large surface area for the absorption of food molecules.
C. Q secretes digestive juice which contains mucus, and enzyme amylase.
D. P makes the medium acidic to help the digestive enzyme to act upon food stuff.
Answer : B