12. atoms - CBSE STD 12 Science Physics Questions

722

Questions

1

Question groups

5

Question types

01

M.C.Q (1 Marks)

722 Q→

Sample Questions

12. atoms questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark

Given below are two statements:

Statement $I$: Atoms are electrically neutral as they contain equal number of positive and negative charges.

Statement $II$: Atoms of each element are stable and emit their characteristic spectrum.

In the light of the above statements, choose the most appropriate answer from the options given below.

A
Both Statement $I$ and Statement $II$ are incorrect
✓
Statement I is correct but Statement $II$ is incorrect
C
Statement $I$ is incorrect but Statement $II$ is correct
D
Both Statement I and Statement $II$ are correct

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark

Match List $I$ with List $II$.

List $I$ (Spectral Lines of Hydrogen for transitions from)	List $II$ (Wavelengths ($nm$))
$A$ $n_2=3 \text { to } n_1=2$	$I$ $410.2$
$B$ $n_2=4 \text { to } n_1=2$	$II$ $434.1$
$C$ $n_2=5 \text { to } n_1=2$	$III$ $656.3$
$D$ $n_2=6 \text { to } n_1=2$	$IV$ $486.1$

Choose the correct answer from the options given below:

✓
$A-III, B-IV, C-II, D-I$
B
$A-IV, B-III, C-I, D-II$
C
$A-I, B-II, C-III, D-IV$
D
$A-I I, B-I, C-I V, D-I I I$

Answer: A.

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Q 3M.C.Q (1 Marks)1 Mark

In hydrogen spectrum, the shortest wavelength in the Balmer series is $\lambda$. The shortest wavelength in the Bracket series is $........\,\lambda$

A
$16$
B
$2$
✓
$4$
D
$9$

Answer: C.

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Q 4M.C.Q (1 Marks)1 Mark

The radius of inner most orbit of hydrogen atom is $5.3 \times 10^{-11}\,m$.$........\mathring A$ is the radius of third allowed orbit of hydrogen atom.