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Explain sericulture and moriculture. Can a silkworm be both a caterpillar and a larva? Explain. [3 MARKS]

What is called reeling the silk?

The suspended microbes in a water treatment plant settle at the bottom and the water is removed from the _______.

Question 13

Name the chemicals which are used in refrigerators and air conditioners and damage ozone layer when released in the air.

If there is more acid in our body we take a base.But what should we do if there is more base in our body?

State whether the following statements are true or false. If false, correct them.​

(a) Silk is a plant fibre.​

(b) Jute is obtained from the leaves of a plant.

(c) Weaving is a process of arranging two sets of yarn together.

(d) Cotton yarn on burning gives an odour similar to that of a burning paper.

A CO₂ molecule contains:

Which of the following option can replace the question mark(?) in the figure given below?

For a certain reaction of order $n$, the time for half change, $t_{\frac{1}{2}}$, is given by $t_{\frac{1}{2}}=\frac{(2-\sqrt{2})}{k}\times C_o^{\frac{1}{2}}$ where $k$ is constant and $C_0$ is the initial concentration. What is the value of $n$?

Question 6

On which of the following day is World Water Day observed?
(a) 22 March
(b) 14 November
(c) 2 October
(d) 21 December

Magnitude of H-bonding depends upon:

Water which forms scum with soap is called

The word chromatography is derived from a greek word, 'kroma' which means colour. Select the statements that refer to chromatography.

Sugar Is a compound made up of what elements

1. 4

When we heat water, we find bubbles forming in it. This shows that____.

There are only about 250 individuals of the Great Indian Bustard left in the world. What can you say about the status of this species?

The rate constant of the reaction $A\to B$ is $0.6\times {10}^{-3}{\text{mol L}}^{-1}{\text{s}}^{-1}$. If the concentration of $A$ is $5M$, then concentration of $B$ after $20$ minutes is:

What is the pH range at which our body works?

Which of the following is/are the component(s) required for the propagation of fire?

Read the two statements given below:
(i) The compressed air in the tires of a car exerts a force enough to lift it.
(ii) The air around us is a compound.

A conducting wire is connected in the right gap and known resistance in the left gap of a meter bridge of balancing length is $60\text{cm}$. The balancing length becomes $40\text{cm}$ when the wire is stretched. Length of the wire increases by

Which monument is affected by acid rain and suffering from marble cancer?

Define freshwater. Mention two sources of freshwater