Question
What is the function of thyroxine and adrenaline ?
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Answer
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Fill the blank circles in figure and identify the sex of child $A$ and $B.$
→Find out the names of three metals and three non-metals from the box given as Fig.
Compare $LPG$ and wood as fuels.
→Calculate the pressure when a force of $200N$ is exerted on an area of:
$i. 10m^2$
$ii. 5m^2$
→$i. 10m^2$
$ii. 5m^2$
Name one musical instrument each in which the sound is produced:
$a.$ By vibrating a stretched string.
$b.$ By vibrating air enclosed in a tube.
$c.$ By vibrating a stretched membrane.
$d.$ By vibrating metal plates.
→$a.$ By vibrating a stretched string.
$b.$ By vibrating air enclosed in a tube.
$c.$ By vibrating a stretched membrane.
$d.$ By vibrating metal plates.
What is the cause of friction? Explain with the help of a labelled diagram.
In year 2013, there was a showcase in IIT Hyderabad. All the students from different schools and colleges were invited on that occasion. Naveen with his friends went to see the projects made by M.Tech students. He found a project based on the construction of anti-earthquake buildings in which the small houses of iron rods were constructed. One house was with a hose containing water and the other was without hose. They were shocked on shaking of both the houses.
(i) Describe an earthquake.
(ii) Explain the meaning of quake-resist building.
(iii) Mention which force reduces the shaking in a building with hose.
(iv) State the feeling about the students who showed their project.
(i) Describe an earthquake.
(ii) Explain the meaning of quake-resist building.
(iii) Mention which force reduces the shaking in a building with hose.
(iv) State the feeling about the students who showed their project.
Match items in List $A$ with the items of list $B.$
→|
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List A
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List B
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$(a)$
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Nylon
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$(i)$
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Non-stick coating
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$(b)$
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$PET$
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$(ii)$
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Electric switches
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$(c)$
|
Rayon
|
$(iii)$
|
Parachutes
|
|
$(d)$
|
Thermosetting plastics
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$(iv)$
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Polyester
|
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$(e)$
|
Teflon
|
$(v)$
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Artificial silk
|
With the help of a labelled diagram, describe briefly how an iron key can be electroplated with copper.
Name the type of forces involved in the following:
$i.$ A horse pulling a cart.
$ii.$ A sticker attached to steel almirah without glue.
$iii.$ A coin falling to the ground on slipping from hand.
$iv.$ A plastic comb rubbed in dry hair picking up tiny pieces of paper.
$v.$ A moving boat coming to rest when rowing is stopped.
→$i.$ A horse pulling a cart.
$ii.$ A sticker attached to steel almirah without glue.
$iii.$ A coin falling to the ground on slipping from hand.
$iv.$ A plastic comb rubbed in dry hair picking up tiny pieces of paper.
$v.$ A moving boat coming to rest when rowing is stopped.