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Class 12 Physics (Part Ii) Chapter 12 Atoms Quiz 2 (25 MCQs)

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1. How many protons are there for an atom with 16 neutrons and atomic mass of 33?
2. ..... are horizontal rows of elements that contain increasing numbers of protons and electrons.
3. Vertical columns in the periodic table are ..... of elements with similar properties.
4. The series of hydrogen spectrum which lies in visible region is
5. Classification system for elements is called:
6. What is the sum of the protons an neutrons called? (N):A = Z + N
7. What is the maximum number of electrons the first shell can hold?
8. In 1808, Dalton presented his ..... theory which was the turning point in the study of matter.
9. Which subparticle of an atom can move around?
10. What is the smallest piece of an element?
11. What is the smallest sub atomic particle
12. A Physical chemist looks at
13. What did the Greeks believe were the four basic elements?
14. Which attract:
15. According to classical electro magnetic theory, path of an electron orbit around the nucleus will be
16. This is the smallest unit of an element.
17. The nucleus of an atom consist of:
18. Who proposed plum pudding model of an atom?
19. ..... is what scientists think atoms are like.
20. The longest wavelength in Balmer series of hydrogen spectrum will be
21. Anything that has mass and volume and is found everywhere in the universe.
22. The half life of a radioactive nucleus is 50 days. The time interval (t2-t1) between the time t2 when 2/3 of it has decayed and the time t1 when 1/3 of it had decayed is-
23. According to Bohr's postulates, angular momentum of an electron in its orbit around a nucleus is equal to
24. The diameter of first orbit of hydrogen atom is of the order of
25. What is the study of matter?
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