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01-Half-life of radioactive nucleus Ra-226 is 0.693 x 10^11 s, then decay constant is?

10^-11 s

0.693 x 10^-11 s

10^-11 s^-1

10^-10 s-1

02-What are the number of neutrons, protons and electrons in a neutral atom of U-235 ?

N=92, P=143, E=143

N=92, P=235, E=235

N=143, P=92, E=92

N=235, P=92, E=92

03-When a radioactive nucleons emits a B-particle the mass number of atom

Increases by one

Remains same

Decreases by one

Decreases by four

04-When a radioactive nucleus emits a beta particle, the proton neutron ratio:

Decreases

Remains the same

None of these

Increases

05-During a negative B-decay

An atomic electron is ejected

A neutron in the nucleus decays emitting an electron

An electron which already present with in the nucleus is ejected

A part of binding energy of nuclei is converted into electron

06-The most penetrating radiations out of the following is that of

Gamma rays

Beta rays

@-rays

X-rays

07-Beta particles have penetration of about

100 times more than that of the gamma particles

100 times less than that of an alpha ray

100 times more than that of an alpha ray

10 times more than that of an alpha particles

08-Beta particles have less ionization power than that of alpha particles because:

Their smaller energy

Their smaller mass

Their smaller density

Their smaller charge

09-In a given reaction, radioactive radiations are emitted in the sequence:

γ,B,γ

γ, @, B

B, @, γ

@, γ, B

10-The decay constant λ of a radioactive sample

Decrease as the age of the atoms increase

Is independent of the age

Increase as the age of the atoms increase

Depends on the nature of activity

11-Capture of neutron by a nucleus results in the formation of

Triton

Deuteron

Radio isotopes

Proton

12-Isotopes of an element are atoms whose nuclei have:

The same Z but different A

Same number of neutrons but different number of protons

The same A but different Z

None of the above

13-When B-10 is bombarded by neutrons, @-particles are emitted. The resulting nucleons has the mass number

14-A radioactive decay rate of radioactive elements is found to be 10^3 disintegration per sec at a certain time. If the half life of the elements is 1 second, the decay rate after one second is .... And after 3 second is....

500, 125

10^3, 10^3

125, 500

100, 10

14-The phenomenon of radioactivity is associated with

Fission of nuclei

Emission of spectral lines

Disintegration of neutrons

Spontaneous disintegration of nucleolus of atoms

16-Half-life of Radium is 1600 years. Which of the following is the fraction of a sample of Radium that would remain undecayed after 6400 years?

1/2

1/8

1/4

1/16

17. U-238 nucleus emits two 2-particles and two B-particles and transforms into a thorium nucleus. Which of the following is the mass number and atomic number of the Thorium nucleus so produced?

230, 90

234, 90

230, 88

234, 88

18-The half-life of Bi-210 is 5 days. If we start with 50,000 atoms of this isotope then which of the following will be the number of atoms left over after ten days?

5000

20000

12500

25000

19-WOF is the percentage of the original quantity of a radioactive material left after five half-lives approximately

3 %

10 %

5 %

20 %

21-The decay of neutrons inside the nucleus of atoms, result in the emission of

Proton

An @-particle

γ-rays

An electron

22-In which radioactive disintegration, neutron dissociates into proton and electron?

@-emission

γ-emission

B-emission

None of these

23-A radioactive isotope has a life 6000 years. How many time passes before the rate of emission from a simple of this isotope falls to 1/16 of its original value?

6000 years

18000 years

24000 years

96000 years

24-After 2 hours ( 1/16 th ) of a initial amount of a certain radioactive isotope remains undecayed, the half life of the isotope is

60 min

30 min

456 min

15 min

25-Which of the arrangement about the particle is in accordance with the diagram

P=@ , Q=B , R=γ , S=n

P=@ , Q=B , R=n , S=γ

P=γ , Q=n , R=B , S=@

26-Specify the parent, daughter nuclei and emitted particle in given reaction

Parent Nucleus=Thorium , Daughter Nucleus =Uranium ,Emitted Particle=Neutron

Parent Nucleus=Thorium , Daughter Nucleus =Uranium ,Emitted Particle=Alpha

Parent Nucleus=Uranium , Daughter Nucleus =Thorium ,Emitted Particle=Neutron

Parent Nucleus=Uranium , Daughter Nucleus =Thorium ,Emitted Particle=Alpha

27-The symbol Ge-77(32) represents a nucleus of Germanium that decays to a nucleus of arsenic by emitting a B-particle. What is the symbol of this arsenic nucleus?

As-76(32)

As-78(31)

As-77(33)

28-Half life of radioactive element depends upon

Amount of element present

Pressure

Temperature

None

29-By the emission of gamma rays, the nucleus will be

Change to new nucleus

Distort

Be more stable

None of these

30-A radioactive nucleus decays according to following series...If the atomic number and atomic weight of the parent element are 72 and 180 respectively, then the atomic number and atomic mass of X4 are respectively

70 , 172

69 , 171

69 , 172

68,172

31-The particles that experience the strong nuclear force are

Quarks

Hadrons

Leptons

All

33-Which two nuclei contain the same number of neutrons?

C-12 AND C-14

N-16 AND O-15

Na-23 AND Mg-24

Si-32 and P-32

34-A student conducts an experiment using an @-particle source. When considering safety precautions. What can be assumed to be the maximum range of @-particles in air

Between 0 and 5 mm

Between 5 and 200 mm

Between 200 and 500 mm

Between 500 and 1000 mm

35-The following represents a sequence of radioactive decays involving two @-particles and and B-Particles. What is the nuclide X?

At-213

Ir-215

Pb-209

Tl-217

36-The decay of a nucleus of neptunium is accompanied by the emission of a B-particle and γ-radiation. What effect (if any) does this decay have on the proton number and the nucleon number of the nucleus?

Z=increases , A=decreases

Z=decreases , A=increases

Z=unchanged , A=decreases

Z=increases , A=unchanged

37-Radon-220 is radioactive and decays to Polonium-216 with the emission of an @-particle. The equation for the radioactive decay is shown. How many neutrons are in the Radon and Polonium nuclei?

Rn=86 , Po=84

Rn=134 , Po=132

Rn=220 , Po=212

Rn=220 , Po=216

38-Which statement is correct about @-particles?

An @-particle has charge +4e

An @-particle is a helium atom

When @-particle travel through air, they cause ionization

When @-particle travel through a sheet of Gold foil, they make the Gold radioactive

39-Radon-222n decays by @- and B-emission to Bismuth Bi-214. For the decay of each nucleus of Radon, how many @- and B-particles are emitted?

@=1 , B=1

@=2 , B=1

@-1 , B=2

@=2 , B=2

40-What is not conserved in nuclear processes?

Energy and mass together

Nucleon number

Neutron number

Charge

41-Relation for half life of any radioactive element is

T 1/2 = λ In 2

T 1/2 = In 2 / λ

λ=T1/2 In 2

T 1/2= λ/In 2

42-Radioactivity was discovered by

J.J Thomson

W. Roentgen

H. Becquerel

M. Curie & P. Curie

43-In an 2-decay

The parent and daughter nuclei have the same number of protons

The daughter nucleus has one proton more than the parent nucleus

The daughter nucleus has two protons less than the parent nucleus

The parent and daughter nuclei have the same number of neutrons

44-The half-life of isotope Na-24 IS 15 HOURS. How much times does it take for 7/8 th of a sample of this isotope to decay?

75 h

55 h

65 h

45 h

45-The most penetrating radiation out of the following is:

X-rays

B-rays

@-rays

γ-rays

46-Half life of a radioactive material depends on:

Temperature

Quantity of material

Nature of material

All

47-What fraction of a radioactive material will get disintegrated in a period of two half-lives?

Whole

One-fourth

Half

Three-fourth

48-Three fourth of the radioactive nuclei present in a radioactive sample decay in 3/4s. The half-life of the sample is

3/4 s

1 s

3/8 s

1/2 s

49-When a radioactive isotope Ra-228 decays in series by the emission of three @-particles and a B-particle, the isotope finally formed is

X-216(83)

X-220(84)

X-282(86)

X-215(88)

50-The phenomenon of spontaneous disintegration of heavier elements (Z>82) into lighter nuclei with the emission of three types of radiation is:

Radioactivity

Resistivity

Conductivity

Population inversion

51-Which one of the following is undeflected by electric or magnetic field?

Electrons

B-particles

@-particles

γ-particles

52-One Curie =

3.7 x 10^10 Bq

3.7 x 10^10 Henry

3.7 x 10^16 Bq

3.7 x 10^25 Bq

53-The percentage of the original of a radioactive material left after five half-lives is approximately:

.1 %

20%

54-The half life of a radioactive element which has only 1/32 of its original mass left after a lapse of 60 days is

12 days

60 days

32 days

64 days

55-In the following nuclear reaction, how many @ and B particles are emitted?

3 @-particles and 2 B particles

6-particles and 2 B-particles

7 @-particles and 4 B particles

4@-particles and 2 B-particles

56-A substance reduces to 1/16 th of its original mass in 2 hours. The half life period of the substance is

120 min

30 min

15 min

60 min

57-The graph of half-life of radiations is shown in figure. T he graph is called:

Linear curve

Hyperbola curve

Parabolic curve

Decay curve

58-The decay constant λ and the half life T of a radioactive isotopes are related as

λ=In 2 / T

λ= T /In 2

λ=I / (In 2 ) T

λ= 2/T

59-The fission of U-238 is possible by

Only fast neutrons

Fast as well as slow neutrons

Only slow neutrons

Fast protons

60-Which element was used in atomic bombs dropped in Hiroshima and Nagasaki

Uranium

Radium

Protactinum

Plutonium

PHYSICS-Nuclear Physics (SMART INSTITUTE)

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