Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 95

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

The key feature of Bohr\'s theory of spectrum of hydrogen atom is the quantization of angular momentum when an electron is revolving around a proton. We will extend this to a general rotational motion to find quantized rotational energy of a diatomic molecule assuming it to be rigid. The rule to be applied is Bohr\'s quantization condition.

A
2.76 × 10^–46 kg m²

B
1.87 × 10^–46 kg m²

C
4.67 × 10^–47 kg m²

D
1.17 × 10^–47 kg m²

Solution
Question 2
4 / -1

The key feature of Bohr\'s theory of spectrum of hydrogen atom is the quantization of angular momentum when an electron is revolving around a proton. We will extend this to a general rotational motion to find quantized rotational energy of a diatomic molecule assuming it to be rigid. The rule to be applied is Bohr\'s quantization condition. In a CO molecule, the distance between C (mass =12 amu) and O (mass =16 amu), where

A
2.4 × 10^–10 m

B
1.9 × 10^–10 m

C
1.3 × 10^–10 m

D
4.4 × 10^–11 m

Solution
Question 3
4 / -1

A
Zero

B
Much less than 0.8 × 10^–6 eV

C
Nearly 0.8 × 10⁶ eV

D
Much larger that 0.8 × 10⁶ eV

Solution
Question 4
4 / -1

A
0 ≤ K ≤ 0.8 × 10⁶ eV

B
3.0eV ≤ K ≤ 0.8 × 10⁶ eV

C
3.0eV ≤ K < 0.8 × 10⁶ eV

D
0 ≤ K < 0.8 × 10⁶ eV

Solution
Question 5
4 / -1

The activity of a freshly prepared radioactive sample is 10¹⁰ disintegrations per second, whose mean life is 10⁹ s. The mass of an atom of this radioisotope is 10^–25 kg. The mass (in mg) of the radioactive sample is

A
1

B
3

C
4

D
6

Solution
Question 6
4 / -1

Four physical quantities are listed in Column I. Their values are listed in Column II in a random order

A
A → p, B → r, C → r, D → q

B
A → p, B → r, C → q, D → r

C
A → p, B → r, C → q, D → p

D
A → p, B → r, C → q, D → s
Question 7
4 / -1

A

B

C

D

Solution
Question 8
4 / -1

Which sample contains greater number of nuclei: a 5.00 – μCi sample of ²⁴⁰Pu (half-life 6560y) or a 4.45 – µCi sample of ²⁴³Am (half-life 7370y)?

A
²⁴⁰Pu

B
²⁴³Am

C
Equal in both

D
None of these

Solution
Question 9
4 / -1

How much work must be done to pull apart the electron and the proton that make up the Hydrogen atom, if the atom is initially in the state with n = 2 ?

A
13.6 × 1.6 × 10¹⁹ J

B
3.4 × 1.6 × 10¹⁹ J

C
1.51 × 1.6 × 10¹⁹ J

D
0

Solution
Question 10
4 / -1

When a sample of solid lithium is placed in a flask of hydrogen gas then following reaction happened

A
True

B
False

C
May be true at a particular pressure

D
None of the above