NSO Science Olympiad Online Mock Test Class 10 Set A

1. A particle starts from rest at time t = 0 and moves in a straight line with acceleration as plotted in given graph. The speed of the particle will be maximum at time ____.

2. The given figure shows monthly changes in the human ovary during the reproductive cycle.   Which of the following statements is most accurate regarding the labelled structure(s)?

3. The dwarf variety of garden pea plants are now known to have a mutation in a gene needed for synthesis of gibberellin. F₁ plant obtained by Mendel from the tall (TT) × dwarf (tt) cross were tall.
Which of the following inferences can be drawn from the given information?
(i) Gibberellin causes elongation of stems.
(ii) Heterozygous (Tt) plants produce the same amount of gibberellin as homozygous dominant (TT) plants.
(iii) Gibberellin induces production of auxin.
(iv) Mutation may have occurred in a gene producing an enzyme.

4. Metals are extracted from their ores by different methods depending on their position in the activity series. Metals which are extracted by heating, electrolysis and by reduction with carbon respectively are

5. Metals are extracted from their ores by different methods depending on their position in the activity series. Match the Column-I with Column-II and select the correct option from the codes given below.
Column-I Column-II
(a) Highly reactive metals (i) S
(b) Calcination (ii) T
(c) Electrolytic reduction (iii) P
(d) Less reactive metals (iv) R
(e) Roasting (v) Q

6. Match Column-I with Column-II and select the correct option from the codes given below.
Column-I Column-II
(a) Increased egg production (i) Viral disease
(b) White leghorn (ii) Carp
(c) Ranikhet (iii) Fish by-product
(d) Isinglass (iv) Layers
(e) Silver carp (v) Exotic fish
(f) Bombay duck (vi) Silver revolution
(g) Rohu and Catla (vii) Marine fish

7. The given graph shows the concentration of dissolved oxygen along a river. At which point is sewage emptied into the river?

8. Rohan made the following statements regarding the section of a tissue as shown in the given figure.
(i) It provides mechanical support
to the plants.
(ii) Its cell wall shows localized thickenings.
(iii) Cells are dead.
(iv) Cells are filled with protoplasm and have narrow lumen.
(v) Cells have hard secondary walls.
(vi) It is distributed in almost all parts of the plant body.
Which among them are incorrect?  

9. R is an organic compound containing only carbon, chlorine and fluorine. It is produced as a volatile derivative of methane, ethane and propane. It has
been widely used as refrigerant, propellent and solvent. Montreal protocol phased out manufacture of such compounds because R contributes to S in the atmosphere.
Which of the following would not be a consequence of S?

10. Using the words in the box complete the synthesis process of digestive enzymes before their exocytosis then select the option that will complete the following passage correctly.
1. The (a) provides extensive surface on which (b) carry protein synthesis or synthesis of digestive enzymes.
2. Synthesized enzymes enter (c) and then (d) for modification.
3. The modified enzymes are stored in (e) which pass outwardly and fuse with plasma membrane during exocytosis.

11. A large forest area got burnt in a massive fire. The species that would invade such bared area to rapidly colonize it have __________ , __________ and __________ characteristics.
Fill up the blanks from the given choices and select the correct option.
(i) Long lifespan (ii) Rapid reproduction
(iii) Fast growth
(iv) Strong dispersal ability
(v) Strong defense against natural enemies or predators.
(vi) Large sized individuals

12. Given are different parts of respiratory tract. Which path a molecule of carbon dioxide in the alveolus of the inferior lobe of lung takes on its journey to the outside?

13. Four seedlings of equal size and length are taken and given different treatments:
Plant P : Tip not removed, nothing applied.
Plant Q : Tip removed, nothing applied.
Plant R : Tip removed, gelatin block was placed on cut edge.
Plant S : Tip removed, gelatin block with auxin was placed on cut edge.
What would be the correct order of growth rates of the plants?

14. Albumin is the most abundant protein in blood plasma, accounting for approximately 60% of all plasma protein. A person was found to have reduced level of plasma albumin due to kidney damage. Which of the labelled part(s) would you expect to be the primary site of damage for this patient?  

15. Identify the given organisms, match them with their peculiar features as shown in the table and select the option with all the correct matches.  

16. Aditya accidentally mixed copper sulphate crystals with sand. How can he recover the copper sulphate crystals?
1. Add water to the mixture and filter.
2. Evaporate the filtrate to dryness.
3. Heat the filtrate until it is saturated, and let it cool.
4. Wash the residue, and dry it between sheets of filter paper.

17. Study the given graphs carefully. Which of the following statements is correct?

18. Three hydrocarbons X, Y and Z are shown below: Identify the incorrect statements about these three hydrocarbons.
I. X and Y both differ by a CH2 unit.
II. X and Z have the same boiling point.
III. All have different general formulae.
IV. Y and Z have different molecular masses.

19. The atomic numbers of some elements are given below : The number of valence electrons 8, 2, 1, 7 and 5 respectively are present in

20. Four solutions labelled as P, Q, R and S have pH values 1, 9, 3 and 13 respectively.
Which of the following statements about the given solutions is incorrect?

21. Five students have different amounts of substances.
Nitika : 6.022 × 10²⁴ atoms of Ca
Sagar : 2 g of C
Pooja : 0.5 g atom of Ag
Ranjan : 0.3 mole of H₂SO₄
Yash : 6.022 × 10²⁵ atoms of CO₂
[At. wts. of Ag = 108 u, S = 32 u, Ca = 40 u, C = 12 u, H = 1 u, O = 16 u]
Arrange the students in decreasing order of masses of the substances that they have.

22. The positions of four elements K, L, M and N in the periodic table are shown below : Which of the following statements are correct?
I. K, L, M and N are metalloids.
II. K is a metal while L, M and N are non-metals.
III. Among these four elements, K is the smallest in size.
IV. K is a metal while L and M are metalloids and N is a non‑metal.

23. Compound X decolourises acidified potassium dichromate to produce an acid with a pH value of 4.5. Which of the following could be the structure of X?

24. Which of the following is not an isotope of the other three?

25. Nandita mixed two solutions X and Y. She recorded the following observations and conclusions in her notebook.
I. A yellow precipitate is formed.
II. It is a double displacement reaction.
The solutions X and Y respectively are

26. The height of mercury in a barometer at sea level is higher than that at the top of a hill. Which of the following inferences about this observation is correct?

27. A charged particle enters a uniform magnetic field perpendicular to its initial direction, travelling in air.
The particle is seen to follow the path as shown in the figure.
(i) The magnetic field strength may have been increased while the particle was travelling in air.
(ii) The particle lost energy by ionising the air.
(iii) The particle lost charge by ionising the air.
Which of the above statements is/are correct?

28. A glass sphere of radius 1 m and refractive index 3/2 is silvered at its back. A point object is kept at a distance of 1 m from the front face, as shown in figure. Find the position of the final image.

29. Energy released in the fission of 1 kg of U-235 is equivalent to energy obtained from burning of coal weighing approximately ______.

30. A boy stands between two vertical walls. After making a loud clap, he hears two echoes at an interval of 1 s. If the distance between the two walls is 1000 m, what is his distance from the nearest wall? (Take speed of sound = 300 m s^–1).

31. A box of mass 2 kg has an initial speed of 10 m s^–1 at the foot of the ramp. Given that the friction along the ramp is 2 N, find the height h that the box reaches when its speed is 5 m s^–1.
(Take g = 10 N kg^–1)

32.

33. Three identical resistors are connected across a voltage source V such that one of them is in parallel with other two, which are connected in series as shown. The power dissipated through the first one, compared to the power dissipated by each of the other two is_______.

34. Read the given statements and mark the correct option.
Statement 1 : Magnetic field is not associated with a stationary charge.
Statement 2 : Magnetic field can be detected by means of its effect on a current carrying conductor.

35. A body is suspended from a spring balance kept in a satellite. The reading of the balance is W1 when the satellite goes in an orbit of radius R and is W when it goes in an orbit of radius 2R. Then

36. Figures P, Q and R shows a sequence of folding of a piece of paper. Figure R 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 figure R.

37. P is the son of Q while Q and R are sisters to one another. T is the mother of R. If S is the son of T, which of the following statements is correct?

38. Select the figure from the options which will replace the question mark (?) in the given series.

39. A set of figures carrying certain characters is given. Assuming that the characters in each set follow a similar pattern, find the missing character.

40. In the following question, a related pair of figures is followed by four other pairs of figures. Out of the four pairs, select the pair that has a relationship similar to that in the question pair. The best answer is to be selected from a group of fairly close choices.

41. In a certain code language, the letters immediate next to vowels are replaced with D, all other consonants with preceding letters and the vowels are replaced
with Z. How will the word STANDING be written in that code language?

42. Following two figures show the expenditure on various items by families A and B. Which of the conclusions given below is not correct?

43. Select the mirror image of given combination, if the mirror is placed vertically to the left.

44. A large cube is dipped into a tub filled with colour. When the cube is taken out, it is observed that all its sides are painted. This large cube is now cut into 125 small but identical cubes. How many of the smalle cubes have exactly three faces painted?

45. There are seven figures, the first and last of which are unmarked, and the remaining are marked as P, Q, R, S and T. These seven figures form a series. However, one of the five marked figures does not fit into the series. Identify that figure in the give options.

46. In the following number series, how many 4s are there, which are immediately preceded by a pair of numbers whose product is more than the product of the pair of numbers immediately following 4?
5 3 4 6 4 8 9 4 7 6 4 5 7 4 8 4 4 8 0 2 3 4 3 1 4 7 2

47. The positions of four policemen A, B, C and D is given in a circular park. The park is divided into sixteen plots. P, Q, R and K are the offenders whom they have to catch after given moves. The given figure shows their positions. (Note that the by-lanes are North-South and East-West.) If A, B, C and D were to move clockwise four plots and P, Q, R and K were to move anti-clockwise six plots, then out of the given options, who two would be North and South respectively?

48. Study the following information and answer the question given below.
I. A, B, C, D, E, F, G and H are standing in a row facing North.
II. B is not a neighbour of G.
III. F is at the immediate right of G and neighbour of E.
IV. G is not at the extreme end.
V. A is sixth to the left of E.
VI. H is sixth to the right of C.
After making the linear arrangement, we join them to form a circular arrangement by joining A and H. Which of the following is the odd one out?

49. In the following letter series, some of the letters are missing which are given in that order as one of the options below it. Select the correct option.
ba_cb_b_bab_

50. If yesterday was Saturday’s tomorrow and tomorrow is Wednesday’s yesterday, then what day would it be today?