Compare the properties of electrons, protons and neutrons.
Solution and Explanation
The properties of electrons, protons and neutrons-
| Practile | Nature of Charge | Mass | Location |
|---|---|---|---|
| Electron | Electrons are negatively charged. | \(9 \times 10^{–31}\) kg | Extra nuclear part distributed in different shell or orbits. |
| Proton | Protons are positively charged. | \(1.672 \times 10^{–27}\) kg (1 µ) (approx. 2000 times that of the electron) | Nucleus |
| Neutron | Neutrons are neutral. | Equal to mass of proton | Nucleus |
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Questions Asked in CBSE Class IX exam
Use these adverbs to fill in the blanks in the sentences below.
awfully sorrowfully completely loftily carefully differently quickly nonchalantly(i) The report must be read ________ so that performance can be improved.
(ii) At the interview, Sameer answered our questions _________, shrugging his shoulders.
(iii) We all behave _________ when we are tired or hungry.
(iv) The teacher shook her head ________ when Ravi lied to her.
(v) I ________ forgot about it.
(vi) When I complimented Revathi on her success, she just smiled ________ and turned away.
(vii) The President of the Company is ________ busy and will not be able to meet you.
(viii) I finished my work ________ so that I could go out to play
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- The fun they had
1. ______the firefighters finally put out the fire. (They worked round the clock.)
2. She watched the sunset above the mountain,_____ (She noticed the colours blending softly into one another.)
3. The excited horse pawed the ground rapidly, _____(While it neighed continually.)
4. _____, I found myself in Bangalore, instead of Benaras. (I had taken the wrong train.)
5. _____, I was desperate to get to the bathroom. (I had not bathed for two days)
6. The stone steps,______ needed to be replaced. (They were worn down).
7. The actor received hundreds of letters from his fans, _______(They asked him to send them his photograph.)
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- A truly beautiful mind
- Explain what the reasons for the following are.
(i) Einstein leaving the school in Munich for good.
(ii) Einstein wanting to study in Switzerland rather than in Munich.
(iii) Einstein seeing in Mileva an ally.
(iv) What do these tell you about Einstein?- CBSE Class IX
- A truly beautiful mind
- Were they aware only of their differences or did they also naturally share friendships and experiences? (Think of the bedtime stories in Kalam’s house; of who his friends were; and of what used to take place in the pond near his house.)
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- Why does the world remember Einstein as a “world citizen”?
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