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Subject :NSO    Class : Class 3

When astronauts are out in the space, either they communicate using radios or talk to one another by touching their helmets. Which of the following statements holds true about communication in space?
1.Sound is a vibration that cannot travel through vacuum.
2.Sound vibrations can travel through the material of the helmet to the other.
3.Radiowaves can travel through vacuum.
4.Helmets have speakers built in them which produce sounds when touched.

A4 only
B2 and 3
C1, 2 and 3
D1 and 4


Ans 1:

Class : Class 3
A

Ans 2:

Class : Class 5
D

Ans 3:

Class : Class 4
i am confused

Ans 4:

Class : Class 1
C

Ans 5:

Class : Class 5
ANS A is correct

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 5

Nidhi pushed the plunger of syringe completely and dipped its needle in water. Then she slowly pulled the plunger while its needle was still immersed in water. Select the correct option regarding this.

A Water will move in the syringe when she pushed the plunger down due to air pressure.
B When she pushed the plunger down all the air moved out creating an empty space in syringe.
C Air outside the syringe exerted pressure on water causing it to move in when the plunger is pulled up.
D Both (B) and (C)


YEA IT IS C

Ans 1:

Class : Class 4
well I have no idea if the answer D is correct or not but i think that answer C is not correct as how can you say that the syringe which is inside water will get the force of air

Ans 2:

Class : Class 6
C is the answer to this question

Ans 3:

Class : Class 1
Ans 3 is wrong the correct ans is D.

Ans 4:

Class : Class 5
D is the correct answer

Ans 5:

Class : Class 7

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8

Ans 2:

Class : Class 8
answer should be 0.48

Ans 3:

Class : Class 7
shouldn't the answer be 0.75 m per sec??

Ans 4:

Class : Class 7
2.17

Ans 5:

Class : Class 5
I didn't understand the questionPlease explain🙏🙏🙏

Ans 6:

Class : Class 9
how is this 2.17,can you explain,we got 0.48

Ans 7:

Class : Class 8
2.17 is the answer

Ans 8:

Class : Class 7

Ans 9:

Class : Class 8
how come, Some one pls explain

Ans 10:

Class : Class 8
can some one pls explain

Ans 11:

Class : Class 7
HERE CORRECT ANSWER IS GIVEN AS B THAT IS 0.58

Ans 12:

Class : Class 8
I think 0.75, though not in options

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5

Ans 2:

Class : Class 5
a

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 4

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