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After preparing tea, the need to filter tea leaves from tea is

Question 4 (viii)

State whether the statement given below is True or False.

Vinegar dissolves in water.

An aqueous solution of a metal bromide $MB{r}_2\left(0.05M\right)$ is saturated with $H_{2}S$. What is the minimum pH at which MS will precipitate? Ksp for M S = $6.0\times {10}^{-21}$ : concentration of saturated $H_{2}S$ = $0.1M$ : $K_1$ = ${10}^{-7}$ and $K_2$ = $1.3\times {10}^{-13}$ for $H_{2}S$.

On destructive distillation, 1000 kg of coal gives P kg of coke, Q litres of ammonia, R litres of coal tar and S $m^3$ of coal gas. The value of P, Q, R and S respectively are:

What are periodic and non-periodic changes? Explain with examples. Is a forest fire a periodic or a non-periodic change? [5 MARKS]

While preparing tea, we filter tea leaves from tea:

What is the vertical section of soil called?

Magnets have many applications in our daily lives. Which of the following is an example of using a magnet to separate a mixture?

Question 14

Why do wet clothes placed on a clothes line dry after sometime? Explain.

Smalls stones can be seperated from rice grains by the process of ___

What is change? [1 MARK]

Question 1

Pick the change that can be reversed from the following
(a) Cutting of trees
(b) Melting of ghee
(c) Burning of candle
(d) Blooming of flower

Pick the correct term for "filtering down through the soil horizons"?

Conversion of water into water vapour during evaporation is a

What is the shape of the gas present in a cylindrical can of deodorant?

A mixture contains three different substances, $X,Y$ and $Z$. They are of the same size, cubical in shape and yellow in colour.
$X$ particles are heavy, insoluble, non-magnetic and contribute $50\%$ of the mixture.
$Y$ particles are very light, insoluble, non-magnetic and contribute $40\%$ of the mixture.
And $Z$ particles are iron pieces.
Which of the following methods can separate $X,Y$ and $Z$?

When winnowing is used to separate grains from husk, what is the correct observation?

Select the best material used to make a shoe.

A liquid does not wet the sides of a solid, if the angle of contact is

Question 10

Paheli asked for a glass of water from Boojho. He gave her a glass of ice cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho how these droplets of water were formed? Which of the following should be Boojho’s answer?

(a) Evaporation of water from the glass.

(b) Water that seeped out from the glass.

(c) Evaporation of atmospheric water vapour.

(d) Condensation of atmospheric water vapour.

A phenomenon in which a substance expands and changes its shape is called:

Is the mixture of bran and flour a homogeneous or heterogeneous mixture?

Question 16

Once, Paheli visited a tailor shop and brought home some cuttings of fabric to study their properties. She took two pieces and found that one of the pieces was shrinking when it was burnt with a candle. However, the other did not shrink on burning. Can you help her to find out which of the two was a cotton fabric and which was a silk fabric?

Select the best method for separating insoluble solid impurities in oil before it reaches car engine.

Which of the following can be used to control air pollution?

Which of the following instruments can be used to measure how hot the day is?

Which among the following materials is the heaviest?

Identify the physical property that can help to check the purity of a substance.

The process of removing cotton seeds from pods is called

Identify the demonstrative pronoun from the sentence.

The river was so polluted that these had to die.

Bharath heated a closed vessel full of water. After some time he observed that the water started boiling and after some more time there is no water in the vessel. This is an example of___change. (reversible/irreversible)

Question 10

In a number of musical instruments, air plays an important
role. Can you name some such instruments?

How will you separate a mixture containing kerosene and petrol?

What is a yarn? How is it made? Give examples of devices that are used for making yarn. [3 MARKS]

Choose the artificial fibre.

What will happen if we do not conserve water and it does not rain for years in a particular region?

When we pour cold water in a glass after sometime we find droplet on the glass Same way when we take a glass from fridge with out water even then we find droplets on the glass why

Matter with definite and constant composition, and distinct chemical properties is known as a/an :

Sharpening of a pencil is a type of:

What is the source of water for each of the following? [3 MARKS]
(a) Wells
(b) Groundwater
(c) Atmosphere

The melting point of the solid state of a substance is ${40}^{\circ }C$. The freezing point of the liquid state of the same substance will be:

burns readily and can be used as fuel in homes and automobiles.

Why we should not cook food in aluminum utensils?

The overall charge on the 'sodium chloride' compound formed by the combination of $C{l}^{-}$ ion and $N{a}^{+}$ ion is

What is symbol of sliver and gold

__ (Transpiration/ Respiration) can be investigated by placing a plastic bag over the shoot of a plant.

Lemonade is prepared by mixing lemon juice and sugar in water.You wish to add ice to cool it.Should you add ice to the lemonade before or after dissolving sugar?In which case would it be possible to dissolve more sugar? Does water dissolve an equal amount of salt and sugar? What can be done to dissolve more salt in a saturated solution of water and salt? [5 MARKS]