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Subject :NSO    Class : Class 7

Read the given statements and select the correct option.
Statement 1: Many cut fruits, when kept in open turn brown.
Statement 2: Browning of fruits is due to a chemical reaction.

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 and statement 2 is false.
D Both statements 1 and 2 are false.


Ans 1:

Class : Class 7
option a is the correct answer

Ans 2:

Class : Class 7
Answer is A

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Subject :NSO    Class : Class 5

A ship is made of iron but still it floats in water. This is because of its shape. A ship is hollow in the middle. When it is in water, the entire volume of the ship, including the hollow portion displaces water to make space for itself. The volume of water displaced is much more than the volume of iron in the ship. Therefore, the ship floats in water.
Which of these rules can be deduced from the above given passage?

A If the upthrust is more than the weight, the body sinks in water.
B If the weight is more than the upthrust, the body floats in water.
C If the upthrust is less than the weight, the body floats in water.
D If the weight is more than the upthrust, the body sinks in water.


Ans 1:

Class : Class 3
Refer Archimedes principle.

Ans 2:

Class : Class 3
Refer Archimedes principle.

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Subject :NSO    Class : Class 5

The heart is made up of muscle tissue. However, the tissue in the heart is different from the tissue in the leg. Infer the reason for the difference.

A The heart must beat all the time, so its tissue should be able to contract and relax continuously without getting tired.
B The leg is much larger than the heart, so the tissue in the leg muscle needs to contain larger cells.
C A person can voluntarily control contraction of heart muscles but not leg muscles.
D The heart muscle is surrounded by blood vessels, so the blood makes it look different from the leg muscle.


Ans 1:

Class : Class 5
Answer is A because the heart has cardiac muscles that comes in involuntary muscles work on their own and they continue to beat without stopping . Unlike involuntary muscles like muscles in legs , arms etc. work on signals given by brain

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 8

The force required to start an object sliding across a uniform horizontal surface is larger than the force required to keep the object sliding at a constant velocity. The magnitudes of the required forces are different in these situations because the force of kinetic friction

AIs greater than the force of static friction.
BIs less than the force of static friction.
CIncreases as the speed of the object relative to the surface increases.
DDecreases as the speed of the object relative to the surface increases.


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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
option-c

Ans 2:

Class : Class 6
Option C It is because all of them lay eggs.

Ans 3:

Class : Class 6
because all lay eggs

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
A

Ans 2:

Class : Class 4

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 7

Priya categorised animals on the basis of their respiratory organs. She made three groups of four organisms each. By mistake, she put one wrong member in each group. Identify it and select the correct option.
Group I : Ladybird, Silverfish, King crab, Cockroach
Group II : Arowana, Jellyfish, Sea-horse, Climbing perch
Group III : Krait, Stork, Porcupine, Gambusia

A Silverfish in group I should be interchanged with jellyfish in group II.
B Climbing perch in group II should be replaced with pangolin.
C Ladybird in group I should be interchanged with Gambusia in group III.
D King crab in group I should be replaced with locust.


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