National Science Olympiad Forum By SOF Olympiad Trainer

Jasmine Kaur from Venkateshwar International School , New Delhi

Subject :NSO Class : Class 5

Read the given statements and select the correct option.
Statement 1: Naphthalene balls kept in woollen clothes reduce in size after sometime.
Statement 2: Solid naphthalene balls change into gas due to the warmth of woollen clothes.

ABoth statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
CStatement 1 is correct but statement 2 is incorrect.
DBoth statements 1 and 2 are incorrect.

Woolen clothes do not produce warmth, they only prevent loss of heat. Therefore, statement 2 is incorrect. Hence, the correct answer should be C.

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Ans 1:

Anant Saxena from Delhi public school Gandhinagar , Gandhinagar

Class : Class 9

WOOLLEN CLOTHES DONT HAVE WARMTH THEY CANT CHANGE TEMPRATURE BY THEMSELVES THE CORRECT ANSWER SHOULD BE C

Ans 2:

Hitanshi Behera from Loyola School , Bhubaneswar

Class : Class 4

Warm clothes do not generate heat but also do not allow cool air to enter hence creating warmth for the naptholine balls

Ans 3:

Saksham Chanani from Sri Sri Academy, Kolkata

Class : Class 9

nahi

Ans 4:

Aarna Panjiar from The Shri Ram School, New Delhi

Class : Class 9

Anant is right. Warm clothes do not generate heat.

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Anika S Kumar from Alphabets International school , Chennai

Subject :NSO Class : Class 4

Refer to the given set-up. Beakers X and Y contain equal amounts of water at different temperatures. The water in both the beakers was then poured into the trough. Which of the following is most likely to be the temperature of water in trough after an hour?

A80°C
B90°C
C130°C
D< 80°C

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Ans 1:

Twisha Arora from Modern Vidya Niketan, Sector - 17, Faridabad, Haryana, FARIDABAD

Class : Class 7

(Master Answer)The correct answer is D.

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

D

When the water of beakers X and Y will be mixed, the final temperature will be somewhere between 50°C-80°C. So the temperature will be < 80°C after an hour.

Ans 3:

Muhammad Ibrahim Siddiqui from The Millennium School - Dubai, DUBAI

Class : Class 7

Ans 4:

Muhammad Ibrahim Siddiqui from The Millennium School - Dubai, DUBAI

Class : Class 7

babuski

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Tay Wen Xuan from Inspiros International School, SHAH ALAM

Subject :NSO Class : Class 9

Refer to the given dichotomous key and answer the following questions.

Select the correct match of tissue and its location.

AP-Wall of Bowman's capsule S-Epidermal covering of legume seeds
BQ-Blubber of whale R-Covering of nuts
CR-Petiole of lotus U-Hump of camel
DQ-In subcutaneous tissue T-Stele or vascular cylinder of monocot root

How do I memorize all this in a short amount of time?

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

D

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Tay Wen Xuan from Inspiros International School, SHAH ALAM

Subject :NSO Class : Class 9

Which of the following figures will complete the given figure matrix?

A
B
C
D

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Ans 1:

Harsh Gupta from AECS Narora, Narora

Class : Class 9

answer is D.

Ans 2:

denisa from delhi public school, manglore

Class : Class 3

the ans is D. second inside first inside second.

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SHREYAS ANDOTRA from RYAN INTERNATIONAL SCHOOL, CHANDIGARH

Subject :NSO Class : Class 7

The instrument used to detect both the direction of flow of current and its magnitude in a circuit is

AAmmeter
BSpeedometer
CVoltmeter
DGalvanometer

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Ans 1:

Antareep Mukherjee from New Horizon Public School, Bangalore

Class : Class 8

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Hprakash09 from Billabong high Bhopal, Bhopal

Subject :NSO Class : Class 7

Refer to the given flow chart and select the correct option regarding P, Q, R and S.

APlant P derives nutrition from the host plant with the help of haustoria and possesses hygroscopic roots which absorb moisture directly from atmosphere.
BPlant Q possesses broad thin leaves with superficial stomata.
CPlant R possesses special leaf modifications to catch and digest insects.
DPlant S possesses stilt roots which help in aeration.

all of them are correct

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Ans 1:

SOUVAGYA SAHA from De Nobili School, DHANBAD

Class : Class 10

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

C

In the given flow chart,P could be parasitic plant,Q could be plant in desert habitat,R could be insectivorous plant and S could be plant situated near coastline.P does not possess hygroscopic roots. They are present in some orchids to absorb moisture from atmosphere.Leaves in desert plants are either absent or reduced or they are present in the form of spines.Stilt roots are adventitious roots that arise from the lower nodes and provide extra support to the plant.They are not meant for respiration. So,options A,B and D are incorrect.

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Omkar Deshmukh from phoenix greens international school, Hyderabad

Subject :NSO Class : Class 6

Which of the following are not the examples of circular motion?
(i) Windmill
(ii) Movement of a spinning top
(iii) A train moving on a curved bridge
(iv) Rotation of Earth around the Sun
(v) A battalion moving in a parade

A(i), (ii) and (iii)
B(iii) and (v)
C(iii), (iv) and (v)
D(ii) and (v)

Statement (iv) Needs correction - Rotation of earth is around its own axis and the circular motion of earth around the sun is called "revolution"

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Ans 1:

Ishaan from Mind Tree IIT Mandi Campus School, Mandi

Class : Class 7

Ans 2:

Liza Mary George from St. Thomas Residential School, Mukkolackal, Trivandrum

Class : Class 7

Ans 3:

Shuvangi Das from Vivekananda mission school, haldia

Class : Class 9

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NISHTHA GUPTA from DPS R K Puram, newdelhi

Subject :NSO Class : Class 6

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

A
B
C
D

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Ans 1:

Kavin Karthick M from DPS bangalore east, Bengaluru

Class : Class 6

Ans 2:

SAMPAD BANERJEE from DELHI PUBLIC SCHOOL , BILASPUR

Class : Class 9

Ans 3:

Saikrishna Nandakumar from Shishya BEML Public School, BANGALORE

Class : Class 6

d

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Shreya from RFS, Navimumbai

Subject :NSO Class : Class 9

Read the passage carefully and answer the following questions.
A dancer is demonstrating dance steps along a straight line. The position-time graph of the dancer is given here.

The average velocity of the dancer during time interval between t = 2 s to t = 9 s is

A 1 m s^-1
B - 0.57 m s^-1
C 2.75 m s^-1
D - 0.29 m s^-1

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Ans 1:

Shaina Vanessa from Frank Antony Public School, Bangalore

Class : Class 9

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Siddharth from Navy Children School, KOCHI

Subject :NSO Class : Class 7

According to international system of units, the standard units for time, mass and distance are

ASecond, centimetre, pound
BSecond, kilogram, metre
CCentimetre, kilogram, minute
DNone of these

the standard unit for mass is gram

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