CBSE Class 10 Science NSO Olympiad MCQs with Answers Set C

Logical Reasoning

Question. In a certain code language, ‘si po re’ means ‘book is thick’, ‘ti ma re’ means ‘bag is heavy’, ‘ka si’ means ‘interesting book’ and ‘de ti’ means ‘that bag’. Which of the following means ‘that is interesting’ in that code language?
A. ka de re
B. ti po ka
C. de si re
D. ka re ma
Answer : A

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

Answer : D

Question. If ‘A + B’ means ‘A is the brother of B’; ‘A – B’ means ‘A is the sister of B’; ‘A ∅ B’ means ‘A is the wife of B’ and ‘A # B’ means ‘A is the father of B’, then which of the following options indicate X is son of Y ?
A. Y ∅ Q # R + X – T
B. Y ∅ Q # X – R – T
C. Y ∅ Q # R – X + T
D. Y ∅ Q # R – T + X
Answer : C

Question. In which of the following options, Fig. (X) is exactly embedded as one of its part 

Answer : A

Question. In the given figure, rectangle, square, circle and triangle represents the regions of wheat, gram, maize and rice cultivation respectively

Which area is cultivated by rice and maize only?
A. 9
B. 8
C. 2
D. 7
Answer : C

Question. Find the correct water image of the given Fig. (X).

Answer : B

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

A. 600
B. 640
C. 680
D. 630
Answer : A

Question. How many such pairs of letters are there in the given word each of which has as many letters between them in the word as in the English alphabet?
ENTERTAINMENT
A. Three
B. Four
C. Five
D. More than five
Answer : D

Question. A square transparent sheet (X) with a pattern is given.
Find out from the options as to how the pattern would appear when the transparent sheet is folded along the dotted line.

Answer : D

Question. Two different positions of a dice are shown. What is the number of dots at the top, if 5 dots are at the bottom?

A. 2
B. 4
C. 6
D. 3
Answer : D

Science

Question. Two cars, A and B are moving with a constant speed of 10 m s^–1. Car A is moving on a circular path of radius r and car B is moving on a straight road.
Which of the following statements is correct?
A. Both cars are moving with uniform velocity.
B. Distance moved and magnitude of displacement are equal for car A, at any time.
C. Motion of car B is not accelerated.
D. Motion of car A is non-uniform circular motion.
Answer : C

Question. In an X-ray machine, an electron is subjected to a force of 10^–23 N. Time taken by the electron (initially at rest) to cover a distance of 10 cm is √x × 10^y s. 
Then _____. (Take mass of the electron = 10^–30 kg)
A. x = 1, y = – 7
B. x = 2, y = – 4
C. x = 4, y = – 6
D. x = 2 , y = – 8
Answer : B

Question. A convex mirror of radius of curvature R produces an image (1/2N + 1)th of the size of the object.
The distance of the object from the mirror is
A. NR
B. 2 NR
C. NR/(2N + 1)
D. NR/2(2N + 1)
Answer : A

Question. Two men, A and B, are facing a flat and hard wall as shown in the given figure. When man A makes a clap, man B hears two claps. The speed of sound in air is 320 m s^–1. What is the interval between the two claps heard by man B?

A. 2.14 s
B. 2.78 s
C. 3.16 s
D. 3.75 s
Answer : A

Question. Which of the following diagrams correctly shows the magnetic field lines produced by a current carrying circular loop?

Answer : A

Question. A satellite is orbiting around the earth. The centripetal force on the satellite is F. The gravitational force of the earth on the satellite is also F. The net force on the satellite is
A. Zero
B. F
C. F/√2
D. √2F
Answer : B

Question. The variation of resistance of a wire at room temperature with increase in its length is tabulated here.

If the resistivity of the material of wire is 2 × 10^–7 W m, then the area of cross-section of the wire is
A. 1 × 10^–6 m²
B. 2 × 10^–6 m²
C. 4 × 10^–6 m²
D. 16 × 10^–6 m²
Answer : D

Question. The given figure shows the phenomenon of recombination of the spectrum of white light using two prisms.

If V, I, B, Y, O and R denote violet, indigo, blue, yellow, orange and red colours respectively, then which of the following options correctly lists the colour of marked rays?

Answer : B

Question. Which of the following statements is incorrect?
A. Biomass is the waste of living things and the dead parts of the living things.
B. The energy obtained from biomass is called the bioenergy and it is a non-renewable source of energy.
C. The main constituent of biogas is methane which has a higher calorific value than that of petrol.
D. Biogas is produced by anaerobic degradation of biomass in the presence of water but in the absence of oxygen.
Answer : B

Question. Read the given statements and select the correct option.
Statement 1 : An alpha particle projected towards west is deflected towards north by a magnetic field which is directed out of the plane of the paper.
Statement 2 : If we stretch the thumb, fore finger and middle finger of our left hand such that they are mutually perpendicular, and the fore finger points in the direction of magnetic field and the middle finger in the direction of current, then the thumb will point in the direction of the force acting on the conductor.
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. A boy of mass 50 kg, runs up a flight of 120 stairs, each measuring a height of 25 cm, in one minute and 40 seconds. If g = 10 m s–2, then the power of the boy is
A. 150 W
B. 750 W
C. 500 W
D. 250 W
Answer : A

Question. The given figure shows a ray diagram for the image formation of an object AB by a convex lens.

If A′B′ < AB, then
A. BX = B′X
B. XY > YB′
C. 2XY = BX
D. BY < 3YB′
Answer : B

Question. The graph shows the change in temperature with time when ice at –20°C is heated to 120°C .

Which entry in the options shows the correct change taking place between the points?
    Points                                  Changes
A. P to Q            Average energy of particles remains constant
B. Q to R            Ice melting
C. R to S            The volume of steam is increasing
D. T to U            Water boiling
Answer : B

Question. Observe the given figures carefully.

Fill in the blanks by choosing an appropriate option.
P is (i) and Q is (ii) . Q acts as the (iii) agent while H₂ acts as the (iv) agent.

Answer : C

Question. In the given reactions sequence

X, Y and Z are respectively
A. CH₃CH₂OH, CH₃COOCH₃ and CH ≡ CH
B. CH₃CH₂OH, CH₃CH₂COOH and CH₂ = CH₂
C. CH₃OCH₃, CH₃COCH₂OH and CH₂ = CH₂
D. CH₃CH₂OH, CH₃COOH and CH₂ = CHH₂
Answer : D

Question. Match the metals given in column I with the methods of extraction given in column II and select the correct option from the given codes.
    Column I               Column II
P. Mercury           (i) Heating with coke
Q. Zinc                (ii) Electrolytic reduction
R. Iron                (iii) Thermite reaction
S. Aluminium      (iv) Heating alone
      P  Q    R   S
A. (i) (iv) (ii) (iii)
B. (iv) (i) (iii) (ii)
C. (ii) (iii) (i) (iv)
D. (iii) (ii) (iv) (i)
Answer : B

Question. To write a letter with a graphite pencil, 0.001 g of carbon is required. The total number of carbon atoms used in writing the letter is
A. 6.023 × 10²³
B. 1
C. 5 × 10¹⁷
D. 5.02 × 10¹⁹
Answer : D

Question. Sodium hydroxide solution is added to each of the following test tubes and heated.

In which test tube, the reaction will not occur?
A. I
B. II
C. III
D. IV
Answer : B

Question. Observe the given flowchart carefully.

A. Sulphur, Charcoal and potassium nitrate
B. Potassium nitrate, charcoal and sulphur
C. Sulphur, potassium nitrate and charcoal
D. Charcoal, potassium nitrate and sulphur.
Answer : C

Question. Which of the following reactions are exothermic in nature?
(i) Evaporation of water
(ii) Dissolution of sodium hydroxide in water
(iii) Dilution of sulphuric acid
(iv) Dissolution of ammonium chloride in water
(v) Combustion of methane gas
A. (i), (iv) and (v)
B. (ii), (iii) and (v)
C. (i), (ii) and (iv)
D. (i), (iii) and (iv)
Answer : B

Question. The atoms ³⁰₁₄Si, ³¹₁₅P and ³²₁₆S have the same
A. Nucleon number
B. Number of electrons
C. Number of neutrons
D. Number of protons
Answer : C

Question. The positions of four elements P, Q, R and S are shown on the outline of a part of the periodic table.
Element X has a high melting point and is a good conductor of electricity. It forms chlorides XC_l2 and XC_l3. Which element is X?

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

Question. Steam at 100°C is a more effective heating agent than water at the same temperature because
A. Steam is a form of hot vapours and water is hot liquid
B. 1 kg of water at 100°C has 22.6 × 10⁵ joules more energy than 1 kg of steam at the same temperature
C. 1 kg of steam at 100°C has 22.6 × 10⁵ joules more energy than 1 kg of water at the same temperature
D. None of these.
Answer : C

Question. Find the incorrect match.
A. Cs and Ga – High melting point
B. Cu – No reaction with dil. HCl
C. Pb and Hg – Poor conductors of heat
D. Mg and Mn – React with very dil. HNO₃
Answer : A

Question. The given flow chart shows one of the pathways of glucose breakdown. Identify ‘P’ and ‘Q’.

A. Ethanol and carbon dioxide
B. Pyruvate and carbon dioxide
C. Pyruvate and lactate
D. Ethanol and pyruvate
Answer : C

Question. Read the following statements about the transmission of nerve impulse and select the correct ones.
(i) In a neuron, nerve impulse travels from the axonal end to the dendritic end as:
Axonal end → Axon → Cell body → Dendritic end
(ii) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in the dendrite of another neuron.
(iii) A neuron transmits the nerve impulses not only to another neuron but also to the muscle cells and gland cells.
(iv) The neurotransmitter released at the post-synaptic membrane, diffuses across the synapse and comes into contact with the chemoreceptor sites in the pre-synaptic membrane.
A. (i) and (ii) only
B. (ii) and (iii) only
C. (iii) and (iv) only
D. (i) and (iv) only
Answer : B

Question. Study the given concept map of the cell and select the option which is correct regarding E, F, G and H.

A. E can be an onion skin cell and G can be an animal nerve cell.
B. F can be a root cell of a plant and H can be a mature mammalian RBC.
C. E can be a leaf cell of a plant and H can be an onion skin cell.
D. F can be a mature mammalian RBC and G can be an animal nerve cell.
Answer : B

Question. Which of the following options is incorrect regarding the part labelled as P in the given figure?

A. It is a paired structure present in human male reproductive system.
B. Its duct joins with the vas deferens.
C. It secretes slightly acidic fluid, which increases sperm motility.
D. Its secretion is rich in fructose sugar.
Answer : C

Question. Select the correct match out of the following

Answer : C

Question. Given figures represent certain parts/structures (i), (ii), (iii), (iv) and (v) of plants and animals. Identify the pairs of structures that are homologous to each other and select the correct option.

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

Question. In pea plants, round seeds (R) are dominant over wrinkled seeds (r), and yellow seeds (Y) are dominant over green seeds (y) . When a cross is made between a pea plant having round and yellow seeds (RrYy) with a pea plant having round and green seeds (Rryy), what fraction of the progeny will have wrinkled and green seeds?
A. 1/2
B. 1/4
C. 3/8
D. 1/8
Answer : D

Question. Given table gives some information about the trophic levels of a food chain

Which of the following food chains is correct with respect to the given information?
A. W →Y → Z → X
B. Y → Z → W → X
C. X → Z → W → Y
D. Y → W → Z → X
Answer : D

Question. The epithelial tissue that lines the stomach and the intestine is

Answer : B

Question. Which of the following is an incorrect match of phylum, type of coelom present in it and a characteristic feature?

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

Question. Match column I with column II and select the correct option from the given codes
      Column I                    Column II
(a) Sleeping               (i) A water-borne bacterial sickness disease
(b) Hepatitis              (ii) Caused by a protozoan 
(c) Tuberculosis        (iii) A viral disease that affects liver
(d) Dengue               (iv) Prevented by BCG vaccine
(e) Cholera               (v) A viral disease transmitted by mosquito
A. (a) – (ii), (b) – (iii), (c) – (iv), (d) – (v), (e) – (i)
B. (a) – (v), (b) – (iii), (c) – (iv), (d) – (ii), (e) – (i)
C. (a) – (ii), (b) – (v), (c) – (i), (d) – (iii), (e) – (iv)
D. (a) – (i), (b) – (ii), (c) – (iv), (d) – (iii), (e) – (v)
Answer : D

Achievers Section

Question. Nine identical resistors of resistance 1 W each are connected as shown in the given figure.

Answer : D

Direction: Refer to the given paragraph and answer the questions a and b.
Akshita has arranged the following sets of experiments to observe the reactivity of different metals.

Question a. Identify X, p, q, r and s.
A. X-Mg, p-Grey, q-Colourless, r-Greenish-yellow, s-Colourless
B. X-Al, p-Grey, q-Colourless, r-Grey, s-Green
C. X-Au, p-Golden, q-Green, r-Silver-grey, s-Yellow
D. X-Cu, p-Reddish-brown, q-Blue, r-Reddish-brown, s-Colourless
Answer : D

Question b. Decreasing order of reactivity of given metals is
A. Zn > X > Fe > Ag
B. X > Zn > Fe > Ag
C. Zn > Fe > X > Ag
D. Zn > Fe > Ag >  X
Answer : C

Question. Study the given figure of the chloroplast and select the correct statement regarding it.

A. The processes involving photolysis of water and evolution of molecular oxygen take place in the part labelled as P.
B. Synthesis of assimilatory power (ATP + NADPH) takes place in the part labelled as Q.
C. Excess of glucose molecules synthesised during photosynthesis are stored mainly in the form of glycogen represented as R in the given figure.
D. The photosynthetic reactions that take place in the part labelled as Q are the enzymatic reactions which require the presence of light for their occurence.
Answer : A

Question. P and Q in the given graph are the action spectra of the two enzymes. The two enzymes are

A. P : Amylase      Q : Trypsin
B. P : Pepsin         Q : Trypsin
C. P : Sucrase       Q : Rennin
D. P : Lactase       Q : Amylase
Answer : B