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Subject :NSO    Class : Class 9

In an experiment to determine the speed of sound, a gun was fired and an observer at a certain distance (x) away measured the time interval (t) between seeing the flash and hearing the shot. Then the speed of sound in air is calculated by x/t.
Which of the following will affect the result?
(i) Temperature of the environment.
(ii) Pitch of the gunshot.
(iii) Wind blowing from the gunner to the observer.
(iv) Loudness of the gunshot.
(v) Wind blowing from the observer to the gunner.
(vi) Quality of sound by gunshot.

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


Ans 1:

Class : Class 9
How come temp does not affect the experiment?

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Subject :NSO    Class : Class 9

Ans 1:

Class : Class 10
B

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
D

Ans 2:

Class : Class 8
A

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Subject :NSO    Class : Class 7

Cocoons of silkworms are used for obtaining silk fibres. The ……A………… of silk worms is known as………B…………while the process of taking out threads from the ……C………… is called …………D………....

AA - shearing , B - pisciculture , C - larva , D – reeling
BA - rearing , B - sericulture , C - larva , D – reeling
CA - tearing , B - pisciculture , C - cocoon , D – reeling
DA - rearing , B - sericulture , C - cocoon , D – reeling


interesting question

Ans 1:

Class : Class 8
ITS OPTION "D"

Ans 2:

Class : Class 7
Option D

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
why cant it be surgical mask

Ans 2:

Class : Class 8
water tumbler because it help water to pass through it

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Subject :NSO    Class : Class 5

Sunidhi could see a pointed beam of light on settingup an experiment as shown here. She used sheets P, Q and R made of three different materials respectively. She noticed that when she replaced the sheet P with a sheet made of the same material as sheet Q, then she could see the whole candle.

Which of the following options is correct regarding P, Q and R?

ASheet Q is made of a transparent material.
BSheet R is made of a transparent material.
CSheet P is made of an opaque material.
DAll of these.


couldnt understand

Ans 1:

Class : Class 6

Ans 2:

Class : Class 5

Ans 3:

Class : Class 5

Ans 4:

Class : Class 6
answer is D. BECAUSE IF P IS OPAQUE THAN ONLY THE SHADOW WILL WILL BE THE HOLE AND LIGHT DOES NOT PASS THROUGH OPAQUE MATERIAL.IF P IS OPAQUE THAN Q AND R WILL BE TRANSPARENT.

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 6
the answer is b

Ans 2:

Class : Class 8
ITS OPTION "D" as it increases surface area for intake of more oxygen

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 3
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Ans 2:

Class : Class 8
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Ans 3:

Class : Class 3
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Ans 4:

Class : Class 3
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Ans 5:

Class : Class 8
NITROGEN , PHOSPHORUS, POTASSIUM ARE EXXESIVELY PRESENT WHICH CAN CREATE THE SOIL ACIDIC . THAT IS WHY ANSWER IS "C"

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
C and A are same . But how can Charles and Annie ( C and A ) be same ?

Ans 2:

Class : Class 7

Ans 3:

Class : Class 7

Ans 4:

Class : Class 6
DIFFERENCE BETWEEN OPTION A. AND C. IS IN OPTION A THE MIDDLE RECTANGLE IS THINNER WHEREAS THE OTHER IS WIDER.

Ans 5:

Class : Class 5

Ans 6:

Class : Class 6

Ans 7:

Class : Class 5
DIFFERENCE BETWEEN OPTION A. AND C. IS IN OPTION A THE MIDDLE RECTANGLE IS THINNER WHEREAS THE OTHER IS WIDER.

Ans 8:

Class : Class 5
A AND C ARE THE SAME

Ans 9:

Class : Class 4
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Ans 10:

Class : Class 5
option c and a are same.

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