The Structure of Atom Worksheet-4

The Structure of Atom Worksheet-4

1. A particle X deflects towards negative plate in the presence of electric field. Identify the particle X?

(a) Neutron       (b) Electron      (c) X-ray            (d) Proton

2. Bohr’s atomic model couldn’t explain:

(a) The fine spectrum of hydrogen

(b) The spectra of single electron species

(c) The stability of atom

(d) Both (A) and (C)

3. Bohr’s theory is not applicable to:

(a) H                   (b) He⁺               (c) Li²⁺               (d) H⁺

4. Maximum no. of electrons that can be present in M & N shells respectively are:

(a) 18, 32           (b) 8, 18             (c) 32, 50           (d) 32, 48

5. Rutherford’s theory assumed which of the following paths for the electron?

(a) Elliptical      (b) Circular       (c) Spiral           (d) All of these

6. The number of valence electrons present in noble gases is:

(a) 6                    (b) 18                  (c) 8                    (d) 4

7. The ratio of neutrons in O¹⁶ and O¹⁸ is:

(a) 9 : 10            (b) 4 : 5              (c) 9 : 8              (d) 1 : 1

8. In Thomson’s Atomic Model the electrons are

(a) Stationary   (b) Revolving    (c) Rotating       (d) None of these

9. According to J. J. Thomson’s model, negative charges are embedded in:

(a) A lump of positive charge    (b) A lump of neutral particles

(c) A lump of small atoms          (d) The nucleus

10. Energy is absorbed when an electron jumps from

(a) K-shell to L-shell                   (b) L-shell to K-shell

(c) Both a and b                            (d) Cannot say

Answer Key:

(1)-(b); (2)-(a); (3)-(d); (4)-(b); (5)-(c); (6)-(c); (7)-(b); (8)-(a); (9)-(a); (10)-(a)