National Science Olympiad Forum By SOF Olympiad Trainer

Reagan Dmello from New Horizon scholars school, Thane West

Subject :NSO Class : Class 4

Two life cycles are represented here.

Now, select the correct option regarding them.

	X	Y
A	Cockroach	Butterfly
B	Housefly	Silkworm
C	Frog	Cockroach
D	Butterfly	Frog

frog has four stages.. hence c should be the answer

Ans 1:

Anwita from Gea, Mumbai

Class : Class 4

d is wrong frog has 4 life stages

Ans 2:

Saarth Sarnobat from Blue Ridge, Pune

Class : Class 5

why

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Advika Behera from Sardar Patel Vidyalaya, New Delhi , New Delhi

Subject :NSO Class : Class 4

Match column I with column II and select the correct option from the codes given below.

	Column I		Column II
a.	Inclined plane	(i)	Bottle opener
b.	Wheel and axle	(ii)	Ramp
c.	Lever	(iii)	Jar lid
d.	Screw	(iv)	Screwdriver
e.	Wedge	(v)	Fork

	a	b	c	d	e
A	(iii)	(ii)	(iv)	(v)	(i)
B	(i)	(iii)	(v)	(iv)	(ii)
C	(iv)	(v)	(iii)	(ii)	(i)
D	(ii)	(iv)	(i)	(iii)	(v)

the correct answer is d

Ans 1:

Mohit Jha from Sai International School, Bhubaneswar

Class : Class 4

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Nithya Soman from The Charter School, Eranakulam

Subject :NSO Class : Class 4

A mirror and a glass are placed between a light source and a screen as shown in the given figure.

Which of the following shadows will be formed on the screen?

A
B
C
DNo shadow will be formed

Ans 1:

Aarya Ranjan from Chrysalis High Varthur, bangalore

Class : Class 5

Ans 2:

SHIVAANSH SATAPATHY from DPS VINDHYANAGAR, SINGRAULI

Class : Class 4

Ans 3:

Spruha from AVM, mumbai

Class : Class 5

Ans 4:

Aarya Ranjan from Chrysalis High Varthur, bangalore

Class : Class 5

Ans 5:

Aarya Ranjan from Chrysalis High Varthur, bangalore

Class : Class 5

Ans 6:

Aarya Ranjan from Chrysalis High Varthur, bangalore

Class : Class 5

dont understand why it is c

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Nithya Soman from The Charter School, Eranakulam

Subject :NSO Class : Class 4

Which of the following statements is INCORRECT?

ADown feathers of birds keep them warm
BWading birds have long legs with spread-out toes that help them to walk in water
CPerching birds have two toes in the front and two toes at the back
DFlesh-eating birds such as eagle, vulture and hawk have strong, sharp and hooked beaks

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Ans 1:

Malhaar from Inventure Academy, Bangalore

Class : Class 5

Ans 2:

Arnav Loganathan from Suguna PIPS , Coimbatore

Class : Class 4

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SAJITA AMUTHAN from Mayoor Private School , AbuDhabi

Subject :NSO Class : Class 4

Letters H to M in the given food web represent six animals.

Which of the following is correct regarding this?

A A decrease in population of H will result in an increase in populations of l and L.
B An increase in population of K will result in an increase in populations of l and J.
C A decrease in population of M will result in an increase in populations l and K.
D An increase in population of L will result in a decrease in populations of H and J.

The question is not specific about the direction of arrow and what it represents-whether consumption or 'the consumed'?It can be inferred that in option D, M is being consumed by I and K. In this case an increase in L will decrease H which will increase I's population thereby reducing J.In that case option D would be correct.

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ARNAV BANSAL from Arwachin International School Pilkhuwa, PILKHUWA

Subject :NSO Class : Class 4

Study the given flow chart based on states of matter. Which of the following is correct regarding this?

	P	Q	R
A	Water vapour	Milk	Pen
B	Ketchup	Steam	Rubber ball
C	Steam	Ketchup	Orange juice
D	Cold drink	Vinegar	Eraser

And=A

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Navya from Doon, Chandigarh

Subject :NSO Class : Class 4

In order to dissolve the greatest amount of sugar in a cup of water within the fastest possible time, you should ________.

AUse sugar in large pieces, and cool the water
BUse sugar in large pieces, and heat the water
CUse crushed sugar and cool the water
DUse crushed sugar and heat the water

The answer is D because if we use crushed sugar and heat the water. The sugar quickly dissolves in water.

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Ans 1:

Bismeet Chetia from NPSI Singapore, Singapore

Class : Class 4

Moi is nazanoo

Ans 2:

Preesha Shrivastav from Suncity school, Gurgaon

Class : Class 4

Option D because crushed sugar is smaller and when water is heated, molecules will spread out and sugar will dissolve quicker

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Saidutta Priyadarshi Maharatha from DAV Public School Unit 8, bhubaneswar

Subject :NSO Class : Class 4

In the given food web P, Q, R, S, T and U are consumers. Which of these consumers are only plant-eaters?

AP and S
BQ and T
CR and Q
DU and P

both C and D are correct

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Avani Gadgilwar from Orbis, Pune

Subject :NSO Class : Class 4

Study the given figure carefully. It will be toughest to lift the rock when the force is applied at X, while it will be easiest to do the same when the force is applied at Y. Now, select the correct option regarding X and Y.

	X	Y
A	b	c
B	d	a
C	c	b
D	a	d

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Mahi from BIS , delhi

Subject :NSO Class : Class 4

Electricity travelling through a wire is an example of

A A force applied by a simple machine
B Energy flowing through the water cycle
C Earth's gravitational pull on an object
D Energy being transferred from place to place.

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