Unicus Science Olympiad (USO) Class 10 Sample Paper

Sample Paper
(2020-21)

Class 10
Unicus Science Olympiad

Section – Class* Total Marks per Total
*Syllabus covered Questions Questions Questions
Classic Section – Class 9 28 1 28
Classic Section – Class 8 12 1 12
Scholar Section – Class 9 7 2 14
Scholar Section – Class 8 3 2 6
Grand Total 50 60

1. Read the following statement and choose the correct option:

Statement 1: When a body is thrown up, the acceleration due to gravity at the topmost
point is zero.
Statement 2: The acceleration due to gravity is always directed downwards towards
the centre of the earth for a freely falling body.

a) Statement 1 is correct but statement 2 is incorrect.
b) Statement 1 is incorrect but statement 2 is correct.
c) Both the statements are correct and statement 2 is the correct explanation of
statement 1.
d) Both the statements are correct but statement 2 is not the correct explanation of
statement 1.

Correct Answer: b 1 Mark

2. Three students made the following statements:

Arun: Hydrophytes float on the water surface due to the presence of aerenchyma.
Krish: Apical meristematic tissue is responsible for growth in length.
Suman: Trunk of tree increase in girth due to cell division in meristematic tissue.

Who among them is/are correct?

a) Only Suman b) Only Krish
c) Only Suman d) Arun, Krish and Suman

Correct Answer: d 1 Mark

3. Figure shows the position-time graph of a particles of mass 10 kg. Calculate the force
acting on the particle for 0 < t < 4 s and 8 s < t < 12 s:

a) For 0 < t < 4 s, F = 5 N and for 8 s < t < 12 s, F = 5 N
b) For 0 < t < 4 s, F = 6 N and for 8 s < t < 12 s, F = 5 N
c) For 0 < t < 4 s, F = 0 N and for 8 s < t < 12 s, F = 0 N
d) For 0 < t < 4 s, F = 4 N and for 8 s < t < 12 s, F = 5 N
Correct Answer: c 1 Mark

2

4. Deepak performed the following experiment to separate a mixture of alcohol and water.
He took the mixture of ethyl alcohol and water in a distillation flask provided with
fractionating column. He then started heating the liquid till the mixture begin to boil.

Which of the following observation about the above experiment is/are correct
a) More volatile liquid is condensed first and collected in the flask and less volatile liquid
with high boiling point is collected in another flask.
b) Less volatile liquid is condensed first and collected in the flask and more volatile
liquid with high boiling point is collected in another flask.
c) More volatile liquid is condensed first and collected in the flask and less volatile liquid
with lower boiling point is collected in another flask
d) Less volatile liquid is condensed first and collected in the flask and less volatile liquid
with lower boiling point is collected in another flask
Correct Answer: a 1 Mark

5. Which of the following is/are incorrectly grouped?

1. Virus – Common cold, Chicken pox, Measles
2. Protozoa – Malaria, Kala-azar, Sleeping sickness
3. Bacteria – Elephantiasis, Typhoid, Cholera

a) Only 1 b) Only 2
c) Only 3 d) Both 2 and 3

Correct Answer: c 1 Mark

3

6. A road run parallel to a vertical cliff at a distance of 495 m as shown in the figure. A car
standing at A blows a horn and the driver of the car hears the echo after 3 s. But a
person standing at B hears the sound of horn twice within an interval of 2 s. Find the
distance between the car and the person:

a) 412 m b) 320 m
c) 240 m d) 426 m

Correct Answer: a 1 Mark

7. Arrange the elements Zn, Sn, Ca and Al in the increasing order of their reactivity for
replacing Cu from CuSO4 solution:
a) Zn > Sn > Ca > Al b) Ca > Al > Zn > Sn
c) Ca > Al > Sn > Zn d) Ca > Sn > Zn > Al

Correct Answer: b 1 Mark

8. Select the correct option and complete the following table:

Fibre Type of fibre Results of burning
A Natural Burns slowly, no beads
Cotton Natural B
C Synthetic Burns with smoke, forms
beads

a) A – Wool, B – Burns completely, C – Silk
b) A – Coir, B – Burns with a sooty flame, C – Polyester
c) A – Wool, B – Burns completely, C – Polyester
d) A – Silk, B – Burns completely, C – Nylon

Correct Answer: c 1 Mark

4

9. Arrange the following agricultural practices in the correct order:

Sowing, Manuring, Irrigation, Harvesting, Ploughing, Levelling

a) Ploughing, Sowing, Levelling, Harvesting, Manuring and Irrigation
b) Ploughing, Levelling, Irrigation, Sowing, Manuring and Harvesting
c) Ploughing, Irrigation, Sowing, Manuring, Harvesting and Levelling
d) Ploughing, Levelling, Sowing, manuring, Irrigation and Harvesting

Correct Answer: d 2 Marks

10.

Which of the following is/are the correct features of the phylum represented by the
organisms shown above?
1. This phylum is the second largest phylum.
2. They respire with gills called ctendia or pulmonary sacs.
3. They have blue coloured blood due to the presence of blue pigment, hemocyanin.
4. Endoskeleton is formed of calcareous plates located in the dermis of body wall.

a) Only 1 b) Only 2
c) Both 2 and 4 d) 1, 2 and 3

Correct Answer: d 2 Marks

5