Subject :NSO Class : Class 6
Subject :NSO Class : Class 5
Ans 1:
Class : Class 2
Ans A
When playing a musical instrument that is a closed-end air column, such as the bottles in this activity, the pitch of the note that is made depends on the length of the air column. In other words, the pitch depends on how much water has filled up the bottle and how much empty space remains. This is because the pitch of the sound we hear depends on the frequency of the sound wave that can be created within the bottle's air. The shorter the air column (that is, the shorter the height of the air in the bottle) the higher the frequency. And the higher the frequency the higher the perceived pitch. This is why the empty bottle should have produced a sound wave with a lower frequency than the others and the bottle that was nearly full (three quarters full) should have made the highest pitch.
Ans 3:
Class : Class 6
Ans A When playing a musical instrument that is a closed-end air column, such as the bottles in this activity, the pitch of the note that is made depends on the length of the air column. In other words, the pitch depends on how much water has filled up the bottle and how much empty space remains. This is because the pitch of the sound we hear depends on the frequency of the sound wave that can be created within the bottle's air. The shorter the air column (that is, the shorter the height of the air in the bottle) the higher the frequency. And the higher the frequency the higher the perceived pitch. This is why the empty bottle should have produced a sound wave with a lower frequency than the others and the bottle that was nearly full (three quarters full) should have made the highest pitch.
Post Your Answer
Subject :NSO Class : Class 6
Post Your Answer
Subject :NSO Class : Class 7
Ans 2:
Class : Class 8
statement 1:the roots of the trees of the forest hold the soil and prevent soil erosion.
(true)
statement 2:in forest the leaves of the trees overlap each other and form a canopy and when the rain falls on the leaves the leaves absorb the rain water and some water flows from the branches and remaining water fall on the small shrubs and it absorbs the water and the left over water is then absorbed by the soil so no floods will occur in the forests.
(true)
option B:statement 1 and statement 2 are true but statement 2 is not the correct explanation of statement 1
Post Your Answer
Subject :NSO Class : Class 6
Post Your Answer
Subject :NSO Class : Class 4
Read the given flow chart showing energy conversion and identify P - S.
| P | Q | R | S | |
| A | Car | Solar cooker | Windmill | Radio |
| B | Fan | Nuclear power Plant | Car | Sleeping |
| C | Microwave | Radio | Climbing | Reading |
| D | Bulb | Grass | Hydroelectricity | Bomb |
Can someone please explain hoe does Electrical energy changes to mechanical energy in Hydroelectricity?
Post Your Answer
Subject :NSO Class : Class 6
Post Your Answer
Subject :NSO Class : Class 7
Post Your Answer
Subject :NSO Class : Class 7