Nuclei - Online Test
Q1. α -rays are
Answer : Option D
Explaination / Solution:
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus. They are generally produced in the process of alpha decay, but may also be produced in other ways. Alpha particles are named after the first letter in the Greek alphabet, α.
Q2. β -rays and γ -rays are respectively
Answer : Option B
Explaination / Solution:
No Explaination.
Q3.
The half-life of a radionuclide is
Answer : Option A
Explaination / Solution:
No Explaination.
Q4.
The particles or radiation emitted in the nuclear reaction will be respectively,
Answer : Option D
Explaination / Solution:
No Explaination.
Q5. Which rays are not deflected in electric and magnetic fields?
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. The half life of radium is about 1600 years. Of 100 g of radium existing now, 25 g will remain unchanged after
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. A radioactive element X with a half life of 2 hours decays giving a stable element Y. After a time of t hours ratio of X to Y atoms is 1:7, then the value of t is
Answer : Option A
Explaination / Solution:
No Explaination.
Q8. An electric field can deflect
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. The antiparticle of electron is
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. Plutonium decays with half life of 24000 years. If plutonium is stored for 72000 years, the fraction of it that remains is
Answer : Option A
Explaination / Solution:
No Explaination.
