Yes, You Can Boil Water at Room Temperature

Reading I: Yes, You Can Boil Water at Room Temperature

A. Find the words from the text that have the following meanings. Answer:

a. the height of an object or point in relation to sea level or ground level
Ans: altitude

b. a group of atoms bonded together
Ans: molecule

c. a state in which opposing forces are balanced
Ans: equilibrium

d. to change from a gas or vapour to a liquid
Ans: condense

e. a piece of unreliable information that is repeated so often that it is accepted as the fact
Ans: factoid

f. a space or container from which the air has been removed
Ans: vacuum

g. a device that is used to remove blockages from the drain of a basin or tub
Ans: plunger

B. Complete the sentences with the correct words or phrases from the text. Answer:

a. Water bubbles break down if vapour pressure inside and outside the bubbles is equal.

b. As the altitude goes up, the boiling point of water decreases.

c. Random motion of molecules or particles is called thermal motion.

d. If the door does not open, try jiggling the key in the lock.

e. Certain chemicals can induce undesirable changes in the nervous system.

C. Answer these questions. Answer:

a. What is the speed of the water particles compared with?
Ans: The speed of the water particles is compared with the height of a group of adult humans.

b. How are bubbles formed in the boiling water?
Ans: Bubbles are formed in boiling water when water molecules have enough energy to push back other water molecules in the liquid phase.

c. Mention two things on which external pressure depends.
Ans: External pressure depends on the depth of water and the density of water.

d. How is the atmosphere related to the pressure of water?
Ans: The atmosphere contributes to the total pressure on the surface of the liquid; it adds to the pressure in the liquid.

e. What would happen if the atmospheric pressure on the liquid water was decreased?
Ans: Lower atmospheric pressure can allow boiling bubbles to form at lower temperatures.

f. What would the experimenter gain if s/he pulled the plunger out?
Ans: Pulling the plunger reduces the pressure in the liquid and may induce boiling.

Class 10 English Unit 5 - Grammar I

A. Match the clauses in Column A with their continuation in Column B - Answer:

a. If you go to Taplejung, you can see the Pathibhara temple.

b. You will get well soon, if you follow the doctor’s advice.

c. The horse won’t kick you, unless you go behind it.

d. If I were you, I would see a doctor.

e. What happens, if you heat water?

f. I would miss the bus, if I did not reach the bus stop on time.

g. Provided that they discussed properly, they won’t have misunderstanding.

h. As long as they communicate well, the problem might be solved.

B. Complete the following sentences using the correct form of verbs in brackets - Answer:

a. If it is cold, I will wear a coat.

b. If Purna helps with the housework, his mother will have more time for him.

c. If I were a bird, I would make a good observation of the land below.

d. If I went to Mustang, I would visit Muktinath.

e. If I were a billionaire, I would buy a castle.

f. You’d save petrol if you drove more carefully.

g. Say ‘hello’ if you see her.

h. Provided that you consent, I will take a few days’ leave next week.

i. Take care of the pence, the pounds will take care of themselves.

Class 10 English Unit 5 - Writing I

Write stepwise instructions to draw a jellyfish. Answer:

1. Begin by sketching a circle for the jellyfish’s head.
2. Extend a line downwards from the bottom of the circle to create the body.
3. Draw several semi-straight lines extending downward from the body to represent the tentacles.
4. Make the tentacles look natural by adding some gentle curves to them.
5. On top of the jellyfish’s head, draw two large circular eyes with small dots in the center as pupils.
6. Give the jellyfish a friendly expression by drawing a small smile below the eyes.
7. Enhance your drawing by adding shading or color.