DO NOT OPEN THIS BOOKLET UNTIL ASKED TO DO SO Roll No. Total Qu Questions: 50 50
Time: 1 hr.
CLASS
8 SET-1
SOF NATIONAL SCIENCE OLYMPIAD
Level-2 Guidelines for the Candidate 1.
You will get additional ten minutes to ll up informatio information n about your self on the OMR Sheet, before the start of the exam. 2. The Question Paper comprises two sections, Science (45 Questions) and Achievers Section (5 Section (5 Questions). Each question in Achievers Section carries 3 marks, whereas all other questions carry one mark each. 3. All questions are compulsory. There is no negative marking. Use of calculator is not permitted. 4. Write your Name, Roll No. and clearly on the OMR Sheet No. and Class Class clearly and do not forget to sign it. 5. There is only ON ONE E correct answer. Choose only ONE option for an answer. 6. To mark your choice of answer by darkening the circles in the OMR Sheet, use an HB Pencil or Pencil or a Blue/Black ball point pen only. E.g. Q.16 : Raj goes to school on a bicycle. Which of these safety rules he should follow? A. He should give give signals before before taking turns. B. He should keep to the right of the road. C. He should cross the road by using zebra crossing. D. All of these. As the correct answer is option A, you must B C D 16. A darken the circle corresponding to option A in the OMR Sheet. 7.
Rough work should be done in the blank space provided in the booklet.
8.
Return the Question Paper and OMR Sheet to the invigilator at the end of the exam.
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SCIENCE 1.
2.
Two forces P and Q act on an object in opposite directions.
6.
An object O is placed near a plane mirror as shown.
P is greater than Q. The net force on the object is
Where is the image of object O is seen by the
A.
P + Q acts in the direction of P
observer?
B.
P – Q acts in the direction of P
C.
P + Q acts in the direction of Q
D.
P – Q acts in the direction of Q
Which of the following statements is/ are incorrect? (i)
Human body can conduct charges to some extent.
(ii)
To make electric current charge move continuously in a wire, we need an electric cell or generator.
(iii) Air is an insulator .
A.
P
B.
Q
C.
R
D.
S
(iv) The waves generated by an earthquake are called 7.
highwaves.
Direction : Read the followings statements and select
A.
(i) only
the correct option.
B.
(ii) only
Statement 1 : In our eye, behind the pupil is the
C.
(iv) only
lens which is made up of a jelly like substance.
D.
(i) and (ii) only
Statement 2 : Eye Lens is a converging lens that
forms image of objects on the retina. 3.
Match the two columns and select the correct option from the codes gi ven below. Column-I
4.
Column-II
a.
Friction produces
(i)
Heat
b.
Wheels
(ii)
Ceiling fan
c.
Ball bearings
(iii) Rolling friction
A.
a - (i), b - (iii), c - (ii)
B.
a - (ii), b - (i), c - (iii)
C.
a - (iii), b - (ii), c - (i)
D.
a - (i), b - (ii), c - (iii).
8.
When we look towards the pole star, it appears stationary because
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.
A dog barks in a park and hears its echo after 0.5 seconds. The sound of its bark got reected by a nearby building. The speed of sound in air is 346 m s –1. The distance between the dog and the building is A. B.
86.5 m 80.6 m
C. D.
75 m 8.65 m
It is pointing exactly in the south direction
B.
It is pointing exactly in the north direction
Which of the following could be the reason for a bulb not to glow even if correct connections ar e made?
C.
It is very far from earth as compared to other stars
A.
The battery is dead.
B.
Filament is broken.
C.
Switch is not in ON position.
D.
All of the above.
9.
Both (B) and (C)
When an object is kept along the axis of a convex lens beyond 2 f , where f is the focal length, a real and inverted image smaller than the object is obtai ned
2
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
A.
D. 5.
A.
10.
To avoid slipping while walking on ice, one should take smaller steps because
In front of the lens
A. B. C.
Frictional force of ice is large Of larger normal reaction Frictional force of ice is small
C.
Between the focus and the pole
D.
Both (B) and (C)
D.
Between f and 2 f.
A.
At the focus
B.
Class-8 | Level 2
11.
The chemical reaction due to the passage of electric current depends on A. B. C. D.
12.
B. C. D.
16.
B. D.
Amplitude of vibrating body Increase in surface area of vibrating body Decrease in frequency of vibrating body Increase in distance from the source of sound.
18.
An electric bell is suspended in a bell jar as shown. An observer outside the bell jar can see the clapper striking the bell but cannot hear any sound produced by the striking. What is a possible reason?
Protons move in random directions such that the net movement in a unit volume is zero.
A piece of wax is oating in water. The water occupies one-third of the volume of a bottle . The bottle is made air tight and a large pressure is applied on the enclosed air of the bottle. What will happen A. B. C.
More part of the piece of wax will oat More part of the piece of wax will sink There will be no change in the position of the piece of wax
D.
none is correct
A. B. C.
The bell jar is lled with water. The bell jar has very thick glass. The bell jar is lled with inert gas.
D.
There is a vacuum in the bell jar.
Which of the following statements is/are correct? (i)
Constellation Ursa major contains seven bright stars. (ii) Indian name of scorpius is mriga. (iii) Sirius is the brightest star in the sky. (iv) Ursa minor is also called Great Bear. A. (i) and (iii) only B. (ii) and (iv) only
Electrons move from positive electrode to negative electrode Electrons move from negative electrode to positive electrode Electrons move in random directions
C. 19.
20.
Which of the following objects exerts more pressure on the oor? (All objects have the same mass).
21. B.
D.
(i), (ii), (iii) and (iv)
A.
100 Pa
B.
250 Pa
C.
315 Pa
D.
417 Pa
Who am I ? I. I am prepared by using wood pulp. II. I am used for making parachutes and stockings. III. I am used to make non-stick cookwares. IV. I do not wrinkle easily. I II III IV A. Rayon Nylon Teon Polyester B. Rayon Polyester Teon Nylon C. Rayon Nylon Polyester Teon Nylon
Rayon
Polyester Teon
Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid? A. Magnesium B. Aluminium C.
Class-8 | Level 2
(i), (ii) and (iii) only
A brick placed up right over a surface apply a force of 2.5 N. Find the pressur e exerted by the brick if its dimensions are 25 cm × 10 cm × 6 cm
D.
A.
D.
20° 40°
When the ends of metal wire are not connected to a battery A.
15.
10° 30°
17.
Loudness of sound increases with the A. B. C. D.
14.
C.
An incident ray strikes a plane mirror at an angle of incidence of 40°. What is the decrease in the angle of reection if incident ray moves to an angle of incidence of 30°?
A. C. 13.
Electrodes Magnitude of current Density of liquid All of these
Iron
D.
Copper
3
22.
23.
Nowa days, CNG is lled in cylinders of automobiles. Use of CNG has greatly helped in controlling the air pollution in large cities by red ucing t he percentag e of CO 2 , Pb, unburnt carbon particles, oxides of sulphur and nitrogen in air. The main constituent of CNG is A.
N2
B.
CH4
C.
C2H6
D.
CO + H2
Most of them are elastic, due to which they retain their original shape when compressed and stretched. (ii) They do not shrink or wrinkle on washing. (iii) They absorb moisture and sweat hence remain comfortable in all seasons. What are their main advantages ? A. (i) and (ii) B. (i), (ii) and (iii) C.
(ii) and (iii)
D.
(i) and (iii)
In the following table, main differences between metals and non-metals are given. Which difference is not correct? Metals
Metals are malleable Non-metals are brittle. and ductile.
2.
M e ta ls ar e g oo d Non-metals are bad conductors conductors of heat of heat and electricity (except and electricity. graphite).
4.
25.
4
27.
Nylon
(i)
Thermoplastics
b.
PVC
(ii)
Thermosetting plas tics
c.
Bakelite
(iii) Fibre
A. B.
a-(ii), b-(iii), c-(i) a-(iii), b-(i), c-(ii)
C.
a-(ii), b-(i), c-(iii)
D.
a-(iii), b-(ii), c-(i)
Given below are the characteristi cs of a good fuel. Which one do you think is not correct? A. B. C. D.
28.
Column II
a.
It It It It
is easy to handle and transport. has high caloric value. has high ignition temperature. does not leave any solid residue on burning.
Which is the only non-metal included in the reactivity series of metals? A. B.
Sulphur Carbon
C.
Hydrogen
D.
Chlorine
29. Identify X , Y and Z .
Non-metals
1.
3.
Which of the following represents the correct match for items in Column I with those in Column II . Column I
Consider the following statements about synthetic bres and plastics. (i)
24.
26.
Zone
M et al ox id es ar e Non-metal oxides are acidic or basic. neutral.
X
Outer zone of complete combustion
Blue
Y
Middle zone of partial combustion
Yellow
Z
Innermost zone of unburnt wax vapours
Black
A. B. C. D.
Metals react with acids Non-metals react with acids to to give hydrogen gas. give hydrogen and chlorine gas.
Colour
Least hot, Moderately hot, Hottest Hottest, Least hot, Moderately hot Least hot, Hottest, Moderately hot Hottest, Moderately hot, Least hot
A. B.
1 and 2 only 3 only
C.
1, 2 and 3 only
Choose the correct statement about inflammabl e substances from the following.
D.
4 only
They have
30.
Choose the correct statement from the following. A.
It is difficult to transport natural gas through pipes.
B.
The disadvantage of natural gas is that it cannot be used directly for burning in homes.
C.
Natural gas is stored under high pressure as compressed natural gas.
D.
Natural gas cannot be used for power generation.
31.
A.
low ignition temperature and cannot catch re easily
B.
high ignition temperature and can catch re easily
C.
low ignition temperature and can catch re easily
D.
high ignition temperature and cannot catch re easily.
Read the given statements and select the correct option. Statement 1 : Drip irrigation is useful for water scarce areas. Statement 2 : Drip irrigation minimises water wastage by sprinkling water on crops as rain drops.
Class-8 | Level 2
32.
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.
36.
A. C. 37.
Rohit was asked to write the names of some plantation crops but mistakenly he wrote the names of some other crops also, as shown in the box below. Count the number of plantation crops that Rohit had written and select the correct option.
33.
4
B.
3
C.
5
D.
2
(a)
Loosening and
Column II
1.
Trowel
38.
turning of soil
34.
35.
(b)
Irrigation
2.
Combine
(c)
Threshing
3.
Hoe
(d)
Weeding
4.
Dhekli
A.
(a) - 3, (b) - 2, (c) - 1, (d) - 4
B.
(a) - 3, (b) - 4, (c) - 2, (d) - 1
C.
(a) - 4, (b) - 2, (c) - 3, (d) - 1
D.
(a) - 2, (b) - 4, (c) - 1, (d) - 3
Rhizopus – Nitrogen xation
B.
Clostridium botulinium – Food poisoning
C.
Euglena – Mixotrophic nutrition
D.
Fucus – Multicellular alga
Identify the gure of a given microorganism and select the incorrect statement regarding it.
Different steps of nitrogen cycle are given below. Arrange these steps in the correct seq uence and select the correct option.
Which of the following factors lead to the depletion of biodiversity? Release of toxic chemicals from industries into water bodies. (ii) Overgrazing by cattle and sheep. (iii) Increase in atmospheric temperature resulting in global warming. (iv) Introduction of exotic species. A. (ii) only B. (i), (ii) and (iii) only C. (i) and (iii) only D. (i), (ii), (iii) and (iv)
39.
Passenger pigeon is a/an _______ species. A. C.
40.
B. C. D.
41. It cannot multiply outside the body of host. It responds to heat, chemicals and radiations. It lacks genetic material, like DNA and RNA.
D.
It does not respire.
Class-8 | Level 2
Extinct Vulnerable
B. D.
Endangered Rare
Select the incorrect statement regarding biodiversity. A.
A. B. C.
Protozoa Bacteria
(i)
Select an incorrectly matched pair. A.
B. D.
Conversion of complex organic compounds into ammonia. (ii) Conversion of inorganic nitrogen compounds into organic compounds. (iii) Conversion of ammonia into nitrates. (iv) Conversion of nitrates into free nitrogen gas. (v) Conversion of atmospheric nitrogen into nitrogenous compounds. A. (ii) → (i) → (iii) → (iv) → (v) B. (v) → (ii) → (i) → (iii) → (iv) C. (v) → (iv) → (ii) → (i) → (iii) D. (iv) → (v) → (i) → (iii) → (ii)
Match the column I with column II and select the correct option. Column I
Yeast Algae
(i)
Wheat, Ragi, Flax, Tapioca, Coconut, Jute, Tea, Paddy, Cashewnut A.
Various microorganisms are used in preparing food and beverages for both domestic and industrial uses. Which microorganism is used in vinegar production?
Human activities like forestry, cultivation and grazing are allowed in National Parks. The crocodile project was initiated in district of Odisha. Rare species exist in small numbers and are localised to certain geographical area. The introduction of exotic species threatens the existence of endemic species.
Identify the correctly matched pair. A. Ribosomes – Sites of protein and lipid synthesis B.
Golgi complex – Transport channels for materials
C.
Vacuoles – Osmoregulation in a cell
D.
Peroxisomes – Cell division in animal cells
5
42.
43.
"Cells are formed from pre–existing cells", was proved by _______.
44.
A.
Robert Brown
Read the given passage and select the correct option to ll up the blanks. (i) secretes the hormone (ii) that regulates
B.
Rudolf Virchow
blood sugar level. Deciency of (ii) leads to
C.
Robert Hooke
sugar level in the blood, leading to disease known
D.
Theodor Schwann
as
(iv) . (i)
(ii)
(iii)
(iv)
Diabetes
Read the given statements and select the correct option.
A.
Pituitary
Insulin
Low
1.
Organelle having covering called tonoplast.
B.
Pancreas
Insulin
High Diabetes
2.
Cell organelle also known as cannibal bag.
C.
Pancreas
Glucagon
High Goitre
3.
Non–membranous organelle in cytoplasm.
D.
Adrenal gland Adrenaline
1
2
3
A.
Peroxisome
Centrosome
Ribosome
B.
Plastid
Nucleus
Centriole
C.
Plastid
Lysosome
Vacuole
D.
Vacuole
Lysosome
Ribosome
45.
(iii)
High Goitre
Gas 'X' released from vehicular exhaust is poisonous. It affects lungs and causes irritation in eyes. X reacts with water vapours to form acid rain. Gas 'X' is _______. A.
SO2
B.
CO
C.
NO2
D.
Both (A) and (C)
ACHIEVERS SECTION
DIRECTION : Read the passage carefully and answer
48.
by put ting a 1 kg sto ne in front of the ope n d oor but
Geeta and Gaurav have to heat water for an experiment. Geeta kept her beaker containing water near the wick in the yellow part of the candle ame while Gaurav kept his beaker in outermost non-luminous part of the ame. Which of the following observations do you think is correct?
it could not help as the stone slides with the door and
A.
The water in Gaurav's beaker will get heated in a shorter time and a black ring is deposited on Geeta’s beaker.
B.
Both the beakers become black and take equal time for heating of water.
C.
Geeta’s beaker gets heated faster and gets a black ring.
D.
Gaurav’s beaker gets heated faster and gets a black ring.
question 46 and 47. Spring tted doors close by themselves when released. Suddenly the spring of the door weighing 2 kg of Rahul's house becomes faulty. Mohan tried to stop the door
door get closed. He did another trick. He sandwiched a 20 gm piece of wooden block in the small gap between the door and the oor. Now the door stays open. 46.
This is due to :A.
Pressure on the stone is large due to which it could not stop the door
B.
Action on stone by the door is greater than reaction on the door by the stone
C.
Action of 20 gm block on the oor is greater than reaction offered from the oor
D.
47.
6
Compression of block by the door makes friction larger.
If Rahul used a 5 kg stone in front of the door instead
49.
Given below are the features of a cellular component. Identify it and select the correct statement regarding it. (i)
Folded inner membrane to increase surface area.
(ii)
Absent in mature red blood cells of man.
of 1 kg, then
(iii) It contains enzymes for catalysing biochemical reactions involved in a catabolic process.
A.
The door stays open
A.
It removes dead cells.
B.
The door get closed
B.
It controls metabolic activities of a cell.
C.
The door moves slowly and then stay open
C.
It is a site of cellular respiration.
D.
Information insufcient
D.
It is the secretory organelle of a cell.
Class-8 | Level 2
50.
Study the given ow chart carefully and select the correct option.
A.
X can be snake and Y can be frog.
B.
Both X and Y can be mammals.
C.
Females of both X and Y lay only one egg.
D.
Zygote of X is diploid while that of Y is haploid.
SPACE FOR ROUGH WORK
Class-8 | Level 2
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