Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 58

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Weekly Quiz Competition

Question 1
4 / -1

16 g sample if a radioactive element is taken from Bombay to Delhi in 2 hour and it was found that 1 g of the element remained (undisintegrated). Half life of the element is

A
2 hour

B
1 hour

C
1/2 hour

D
1/4 hour

Solution
Question 2
4 / -1

Unit of radioactivity is Rutherford. Its value is

A
3.7 × 10¹⁰ disintegrations/s

B
3.7 × 10⁶ disintegrations/s

C
1.0 × 10¹⁰ disintegrations/s

D
1.0 × 10⁶ disintegrations/s
Question 3
4 / -1

The count rate of a Geiger-Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5 s^–1 after 2 hours. The initial count rate was

A
25s^–1

B
80s^–1

C
625s^–1

D
20s^–1

Solution
Question 4
4 / -1

In a radioactive decay, the half-life of radioactive substance is t_1/2 = 69.3 sec. The decay constants is

A
0.01 sec^–1

B
0.1 sec^–1

C
10 sec^–1

D
1 sec^–1

Solution
Question 5
4 / -1

An element used for radioactive carbon dating for more than 5600 years is

A
C – 14

B
U – 234

C
U – 238

D
Po – 94
Question 6
4 / -1

The radioactive nucleus ₇N¹³ decays to ₆C¹³ through the emission of

A
Neutron

B
Proton

C
Electron

D
Positron

Solution
Question 7
4 / -1

The counting rate observed from a radioactive source at t = 0 second was 1600 counts per second and at t = 8 seconds it was 100 counts per second. The counting rate observed, as counts per second at t = 6 seconds, will be

A
400

B
300

C
200

D
150

Solution
Question 8
4 / -1

In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following would be emitted in the decay process

A
Proton

B
Neutron

C
Electron

D
Photon

Solution
Question 9
4 / -1

The half life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be

A
93.75%

B
75%

C
25%

D
6.25%

Solution
Question 10
4 / -1

²²Ne nucleus after absorbing energy decays into two a - particles and an unknown nucleus. the unknown nucleus is

A
Nitrogen

B
Carbon

C
Boron

D
Oxygen

Solution