Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 89

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Weekly Quiz Competition

Question 1
4 / -1

Half-life is measured by

A
Geiger-Muller counter

B
Carbon dating

C
Spectroscopic method

D
Wilson-Cloud chamber
Question 2
4 / -1

The decay constant of a radioactive element is 1.5 × 10^–9 per second. Its mean life in seconds will be

A
1.5 × 10⁹

B
4.62 × 10⁸

C
6.67 × 10⁸

D
10.35 × 10⁸

Solution
Question 3
4 / -1

Nucleus produced due to α–decay of the nucleus _ZX^A is

A
_Z+2Y^A+4

B
_ZY^A

C
_Z-2Y^A-4

D
_Z-4Y^A-2
Question 4
4 / -1

Which of the following processes represent a gamma-decay

A
^AX_Z + γ →^AX_Z–1 + a + b

B
^AX_Z + ¹n₀ → ^A–3X_Z–2 + c

C
^AX_Z → ^AX_Z + f

D
^AX_Z + e_–1 → ^AX_Z–1 + g
Question 5
4 / -1

The half-life of ²¹⁵At is 100µs. The time taken for the radioactivity of a sample of ²¹⁵At to decay to 1/16^th of its initial value is

A
400 μs

B
6.3 µs

C
40 μs

D
300 μs

Solution
Question 6
4 / -1

A radioactive substance has an average life of 5 hours. In a time of 5 hours

A
Half of the active nuclei decay

B
Less than half of the active nuclei decay

C
More than half of the active nuclei decay

D
All active nuclei decay

Solution
Question 7
4 / -1

A radioactive sample at any instant has its disintegrations rate 5000 disintegrations per minute. After 5 minutes, the rate 1250 disintegrations per minute. Then, the decay constant (per minute) is

A
0.81n 2

B
0.41n 2

C
0.2 ln 2

D
0.1 ln 2

Solution
Question 8
4 / -1

A count rate meter shows a count of 240 per minute from a given radioactive source. One hour later the meter shows a count rate of 30 per minute. The half-life of the source is

A
120 min

B
80 min

C
30 min

D
20 min

Solution
Question 9
4 / -1

Activity of radioactive element decreased to one third of original activity R₀ in 9 years. After further 9 years, its activity will be

A
R₀

B

C

D

Solution
Question 10
4 / -1

A nucleus decays by β⁺ emission followed by a gamma emission. If the atomic and mass numbers of parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively

A
Z – 1 and A – 1

B
Z + 1 and A

C
Z – 1 and A

D
Z + 1 and A – 1

Solution