Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 64

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Weekly Quiz Competition

Question 1
4 / -1

What is the radius of iodine atom (at. no. 53, mass number 126)?

A
2.5 × 10^–11 m

B
2.5 × 10^–9 m

C
7 × 10^–9 m

D
7 × 10^–6 m

Solution
Question 2
4 / -1

If in Rutherford\'s experiment, the number of particles scattered at 90° angle are 28 per min, then number of scattered particles at an angle 60° and 120° will be

A
112/ min, 12.5/min

B
100/min, 200/min

C
50/min, 12.5/min

D
117/min, 25/min

Solution
Question 3
4 / -1

A double charged lithium atom is equivalent to hydrogen whose atomic number is 3. The wavelength of required radiation for emitting electron from first to third Bohr orbit in Li⁺⁺ will be (Ionisation energy of hydrogen atom is 13.6 eV)

A
182.51 Å

B
177.17 Å

C
142.25 Å

D
113.74 Å

Solution
Question 4
4 / -1

The ionisation potential of H–atom is 13.6 V. When it is excited from ground state by monochromatic radiations of 970.6 Å, the number of emission lines will be (according to Bohr\'s theory)

A
10

B
8

C
6

D
4

Solution
Question 5
4 / -1

A neutron with velocity V strikes a stationary deuterium atom, its kinetic energy changes by a factor of

A
15/16

B
1/2

C
2/1

D
None of these

Solution
Question 6
4 / -1

The transition from the state n = 4 to n = 3 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition

A
2 → 1

B
3 → 2

C
4 → 2

D
5 → 4
Question 7
4 / -1

In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n

A
R /E

B
E /v

C
RE

D
vR

Solution
Question 8
4 / -1

Which of the following atoms has the lowest ionization potential ?

A

B

C

D

Solution
Question 9
4 / -1

A
r_n ∝ n

B
r_n ∝ 1/n

C
r_n ∝ n²

D
r_n ∝ 1/n²

Solution
Question 10
4 / -1

If the atom ₁₀₀Fm²⁵⁷ follows the Bohr model and the radius of ₁₀₀Fm²⁵⁷ is n times the Bohr radius, then find n

A
100

B
200

C
4

D
1/4

Solution