Atoms and Nuclei Test

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Atoms and Nuclei Test - 11

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Weekly Quiz Competition

Question 1
4 / -1

A nucleus of mass M + ∆m is at rest and decays into two daughter nuclei of equal mass (M/2) each. Speed of light is c.
The binding energy per nucleon for the parent nucleus is E₁ and that for the daughter nuclei is E₂. Then,

A
E₂ = 2E₁

B
E₁ > E₂

C
E₂ > E₁

D
E₁ = 2E₂
Question 2
4 / -1

The energy equivalent to 1 mg of matter in MeV is

A
56.25 × 10²²

B
56.25× 10²⁴

C
5.625 × 10²³

D
56.25 × 10²⁸
Question 3
4 / -1

A
3 : 58

B
58 : 3

C
1 : 58

D
58 : 1
Question 4
4 / -1

Fusion reaction takes place at high temperature because

A
KE is high enough to overcome repulsion between nuclei

B
nuclei are most stable at this temperature

C
nuclei are unstable at this temperature

D
None of the above
Question 5
4 / -1

Sun maintains its shining because of the

A
fission of helium

B
chemical reaction

C
fusion of hydrogen nuclei

D
burning of carbon
Question 6
4 / -1

Half life of radium is 1600 years. Its average life is

A
3200 years

B
4800 years

C
2309 years

D
4217 years

Solution
Question 7
4 / -1

A radioactive element X converts into another stable element Y. Half life of x is 2 hrs. Initially, only X is present. After time t, the ratio of atoms of X and Y is found to be 1 : 4. Then t in hours is

A
2

B
4

C
6

D
between 4 and 6

Solution
Question 8
4 / -1

Electrons in the atom are held to the nucleus by

A
Coulomb's forces

B
Nuclear forces

C
Vander waal's forces

D
Gravitational forces
Question 9
4 / -1

In Rutherford experiment, a 5.3 MeV a – particle moves towards the gold nucleus (Z = 79). How close does the alpha particle to get the centre of the nucleus, before it comes momentarily to rest and reverses its motion?
(ϵ₀ = 8.8 × 10^-12 F/m)

A
3.4 × 10^-15 m

B
8.6 × 10^-14 m

C
4.3 × 10^-14 m

D
1.6 × 10^-14 m

Solution
Question 10
4 / -1

Rutherford's atomic model could account for

A
concept of stationary orbits

B
the positively charged control core of an atom

C
origin of spectra

D
stability of atoms

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Atoms and Nuclei Test - 11

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Atoms and Nuclei Test - 11

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Question 1

E2 = 2E1

E1 > E2

E2 > E1

E1 = 2E2

Question 2

56.25 × 1022

56.25× 1024

5.625 × 1023

56.25 × 1028

Question 3

3 : 58

58 : 3

1 : 58

58 : 1

Question 4

KE is high enough to overcome repulsion between nuclei

nuclei are most stable at this temperature

nuclei are unstable at this temperature

None of the above

Question 5

fission of helium

chemical reaction

fusion of hydrogen nuclei

burning of carbon

Question 6

3200 years

4800 years

2309 years

4217 years

Solution

Question 7

2

4

6

between 4 and 6

Solution

Question 8

Coulomb's forces

Nuclear forces

Vander waal's forces

Gravitational forces

Question 9

3.4 × 10-15 m

8.6 × 10-14 m

4.3 × 10-14 m

1.6 × 10-14 m

Solution

Question 10

concept of stationary orbits

the positively charged control core of an atom

origin of spectra

stability of atoms

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E₂ = 2E₁

E₁ > E₂

E₂ > E₁

E₁ = 2E₂

56.25 × 10²²

56.25× 10²⁴

5.625 × 10²³

56.25 × 10²⁸

3.4 × 10^-15 m

8.6 × 10^-14 m

4.3 × 10^-14 m

1.6 × 10^-14 m