CBSE Class 12 Physics Atoms And Nuclei Notes Set C

Atoms and Nuclei

VALUE BASED QUESTIONS

1. Medha’s grandfather was reading article is newspaper. He read that after so many years of atomic bombing is Hiroshima or Nagasaki, Japan National census indicated that children born even now are genetically deformed. His grandfather was not able to understand the reason behind it. He asked his Granddaughter Medha who is studying in class XII science. Medha sat with her grandfather and showed him pictures from some books and explained the harmful effects of radiations.

(i) What are the values/ skills utilized by Kajal to make her grandfather understand the reason of genetically deformity?

(ii) Name the nuclear reactions that occurred is atom bomb.

2. Muthuswami a resident of Kundakulam was all set to leave everything and shift to another place in view of the decision of Govt. to start nuclear thermal power plant at Kundakulam. His granddaughter Prachi, a science student, was really upset on the ignorant decision of her grandfather. She could finally convince him not to shift, since adequate safety measures to avoid any nuclear mishap have already been taken by the Govt. before starting nuclear thermal plants.

• What is the value displayed by Prachi in convincing her grandfather

• What is the principle behind working of nuclear reactor

• What are the main components of nuclear reactor

3. Ruchi’s uncle who was a kabadiwalah was getting weak day by day. His nails were getting blue, he stated losing his hair. This happened immediately after he purchased a big container of heavy mass from Delhi University Chemistry Department. Doctors advised him hospitalization and suspected he has been exposed to radiation. His uncle didn’t know much about radiations but Ruchi immediately convinced her uncle to get admitted and start treatment.

(i) What according to you are the values utilized by Rama to convince her uncle to get admitted in hospital

(ii)Name the radioactive radiations emitted from a radioactive element

4. Shyam saw his younger brother wondering with a question which deals with emission of light from a vapour lamp. He was anxious to know how different colors were being emitted by different light. He also saw mercury and sodium vapour lamps in the physics lab and was curious to know what is inside the lamps.

On seeing his anxiety to know more about it , Shyam explained about absorption of energy and reemission of photons in the visible region. He also advised him not to touch or break any items in the lab for the thirst of knowledge.

a)What is the moral you derive from Shyam?

b)Which series in the hydrogen spectrum is in the visible region?

5. Mr. Raju a daily wages worker got affected by cancer. On knowing about it all his coworkers started avoiding him, fearing that it was contagious. Mr. Raju felt very depressed. Mr. Rahul a close friend immediately took Mr. Raju to a radiologist who examined him and said it was the beginning stage of cancer and it can be easily cured and he also certified that it is not a communicable disease.

(i) What moral values did Mr. Rahul exhibit ?

(ii) A radioactive substance ‘X’ has a half life of 140 days. Initially it is 8g. Calculate the time for this substance ‘X’ when it reduces to 1 g.

Please refer to the link below for CBSE Class 12 Physics Notes - Atoms and Nuclei