National Science Olympiad Forum By SOF Olympiad Trainer

Vedant Sharma from JPHS, Jaipur

Subject :NSO Class : Class 5

Identify X, Y and Z from the given figure and select the correct statement regarding them.

AZ is attached to bones whereas X is not attached to bones
BY is voluntary muscle whereas Z is involuntary muscle.
CX is very strong muscle that works continuously.
DNone of these

How?

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Ans 1:

Dhairya from GREEN FIELDS SCHOOL, DELHI

Class : Class 8

a b c d

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A particle moves on a circular path of radius 7 m with uniform speed of 11 m/s. If it reaches point T from point S, a diametrically opposite point, then during this interval

(i) The average acceleration is zero.
(ii) The average velocity is zero.
(iii) The average acceleration is 11 m/s².
(iv) The average velocity is 7 m/s.
Which of the following options is correct?

A(i) and (ii) only
B(ii) and (iii) only
C(iii) and (iv) only
D(i) and (iv) only

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A student plotted the following four graphs representing the variation of velocity v of sound in a gas with the pressure P for a given temperature. Which one is correct?

A
B
C
D

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A cricket ball of mass 150 g moving with a speed of 126 km/h hits at the middle of the bat, held firmly at its position by the batsman. The ball moves straight back to the bowler after hitting the bat. Assume that the ball rebounds with same speed and they remain in contact for 0.001 s, the force that the batsman had to apply to hold the bat firmly at its place would be

A10.5 × 10^-4 N
B2.1 × 10³ N
C1.05 × 10⁴ N
D2.1 × 10⁴ N

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A boy throws a cricket ball from the boundary to the wicket-keeper. If the frictional force due to air cannot be ignored, the forces acting on the ball at the position X are represented by

A
B
C
D

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A body is dropped from a height h and touches the ground at a speed of 1.2√gh. The work done by air friction is

Amgh
B0.72 mgh
C0.28 mgh
D- 0.28 mgh

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A truck accelerates from speed v to 2v. Work done during this is

AThree times as the work done in accelerating it from rest to v.
BSame as the work done in accelerating it from rest to v.
CFour times as the work done in accelerating it from rest to v.
DLess than the work done in accelerating it from rest to v.

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Debdyuti Basu from Salt Lake School English Medium, Kolkata

Subject :NSO Class : Class 7

Observe the given reaction sequence carefully.

Acetic acid + Sodium hydrogen carbonate (i)
(i) + Ca(OH)₂ (ii) + Water

What could (i) and (ii) be?

	(i)	(ii)
A	CaCO₃	CO₂
B	H₂O	CaCO₃
C	CO₂	CaCO₃
D	H₂O	CO₂

Question is incomplete

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Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

No, it's not... it is just made quite tricky! the answer is C. It asks two question simultaneously: 1. vinegar plus baking soda evolves which gas? 2. What is formed when CO2 reacts with lime water? Hope u know their answers!! ;)

Ans 2:

Sourasis kundu from St.agnes higher secondary School, Kharagpur

Class : Class 6

Ans 3:

Akshay Jha from DPS NERUL, Navi Mumbai

Class : Class 7

Should have given (i) plus water plus sodium acetate, just giving (i) makes it a lot more confusing and makes the second reaction a guessing game. Question should have been framed better.