Atoms and Nuclei (NEET Physics): Questions 51 - 56 of 67

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Question number: 51

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

The half-life of radioactive Radon is 3.8 days. The time at the end of which 120th of the Radon sample will remain undecayedis

(Given log 10 e = 0.4343)

Choices

Choice (4) Response
a.

33 days

b.

3.8 days

c.

76 days

d.

16.5 days

Question number: 52

» Atoms and Nuclei » Mass-Energy Relation

MCQ▾

Question

Energy of each photon obtained in the pair production process will be, if the mass of electron or positron is 12000 a. m. u-

Choices

Choice (4) Response
a.

0.213 MeV

b.

0.465 MeV

c.

0.123 MeV

d.

0.321 MeV

Question number: 53

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

Half-life of Bi 210 is 5 days. If we start with 50, 000 atoms of this isotope, the number of atoms left over after 10 days is

Choices

Choice (4) Response
a.

5, 000

b.

25, 000

c.

20, 000

d.

12, 500

Question number: 54

» Atoms and Nuclei » Mass-Energy Relation

MCQ▾

Question

Sun radiate energy in all direction. The average energy received at earth is 1.4 KW/m 2. The average distance between the earth and the sun is 1.5 ⨯ 10 n m. If this energy is released by conservation of mass into energy, then the mass lost per day by the sun is approximately (Use l day = 86400 sec)

Choices

Choice (4) Response
a.

3.8 ⨯ 10 14 kg.

b.

7.6 ⨯ 10 14 kg

c.

3.8 ⨯ 10 12 kg

d.

4.4 ⨯ 10 9 kg

Question number: 55

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

If 92 U 238 undergoes successively 8 α -decays and 6 β -decays, then resulting nucleus is,

Choices

Choice (4) Response
a.

82 U 206

b.

82 U 214

c.

82 U 210

d.

82 Pb 206

Question number: 56

» Atoms and Nuclei » Radioactivity

Assertion-Reason▾

Assertion (Ꭺ)

The mass of β -particles when they are emitted is higher than the mass of electrons obtained by other means.

Reason (Ꭱ)

β -particle and electron, both are similar particles.

Choices

Choice (4) Response
a. Ꭺ is true but Ꭱ is false
b. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
c. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
d. Both Ꭺ and Ꭱ are false

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