Free Printable Ch12-ATOM

1.

Which series of hydrogen atom lies in visible region?

a)

Lyman

b)

Balmer

c)

Paschen

d)

Brackett

2.

What can cause an electron to held in an atom...

a)

Coulomb force

b)

Nuclear force

c)

Gravitational force

d)

Van-Der walls force

3.

According to Bohr's model the orbit of electron revolving around nucleus is.....

a)

elliptical

b)

circular

c)

parabola

d)

spiral

4.

According to Bohr's model radius of an electron .....

a)

r $\propto\frac{n}{Z}$

b)

r $\propto\frac{n^2}{Z}$

c)

r $\propto\frac{n^2}{Z^2}$

d)

r $\propto\frac{Z^2}{n^2}$

5.

The ionization potential of Hydrogenic ions A and B are $V_A$ and $V_B$ respectively. Now if $V_B>V_A$ then......

a)

$r_A>r_B$

b)

$r_A<r_B$

c)

$r_A=r_B$

d)

non of these

6.

When an electrons makes a transition from higher orbit in the orbit in the hydrogen atom, What is the final orbit of electron....

a)

Fourth

b)

Third

c)

Second

d)

First

7.

The wavelength of spectral line is inversely proportional to the .....

a)

energy difference

b)

velocity of electron

c)

number of electrons

d)

none of these

8.

The spectral line for the Lyman series is transist to Pfund series the number of spectral lines......

a)

increases

b)

decreases

c)

unchanged

d)

increases or decreases

9.

The ionization energy is maximum for...

a)

alkali metal

b)

inert gas

c)

alooys

d)

non metal

10.

According to hypothesis of Bohr model, which of the quantity having discrete value....

a)

K.E

b)

P.E

c)

Linear momentum

d)

Angular momentum

11.

According to classical physics Rutherford atomic model ....

a)

is stable

b)

is unstable

c)

semi-stable

d)

non of these

12.

If alpha particle scattered by large angle, then which model can't explain by it?

a)

Thomson

b)

Rutherford

c)

Both A and B

d)

Nothing can be exolained

13.

When impact parameter is____, then _____ collision occurs.

a)

1, head off

b)

0, head on

c)

1, head on

d)

0, head off

14.

The ratio of K.E and P.E energies of electron in a Bohr orbit of a hydrogen atom

a)

$\frac{1}{2}$

b)

$\frac{2}{1}$

c)

$-\frac{1}{2}$

d)

$-2$

15.

In which of the following system will the first orbit (n=1) be minimum?

a)

hydrogen atom

b)

doubly ionized lithium

c)

singly ionized helium

d)

deuterium atom

Ch12-ATOM

Total questions: 15

Worksheet time: 8mins

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