Chapter # 20 Nuclear Radiation

PHYSICS

CHAPTER # 20 Nuclear Radiation

1.

An alpha particle exerts larger coulomb force on nearby charges than electron because its charge is: a) Less than that of electron b) Greater than that of electron c) Twice that of election d) Zero

C

2.

Which of the following produces more ionization while passing through a gas: a) Alpha particles b) Beta particles c) Gamma particles d) Electrons

A

3.

Alpha particles are highly ionized because of their: a) Greater mass c) Greater density

B b) Greater charge and low speeds d) Greater energy

4.

The distance traveled by a particle from the source to point where it is stopped in the medium is called: a) Its range b) Its displacement c) Its velocity d) None of these

A

5.

The range of alpha particles in air is less because: a) It does interact with matter c) It is reflected soon

B b) it produces intense ionization d) None of the above

6.

Which of the particles does not produce fluorescence in substance like barium platino-cyanide: a)  -particles b)  -particles c) Gamma particles d) None of the above

C

7.

 -particles ionize the atoms due to: a) Electrostatic force of repulsion c) Gravitational force

A

8.

9.

 - particles are: a) Positively charged c) Neutral The  -particles have erratic path due to their: a) Repulsion c) Frequent deflections

b) Electrostatic force of attraction d) Direct collision B b) Negatively charged d) None of the above C b) High speeds d) None of the above

10.

The penetration power of  -particles is greater than  -particles due to their: a) Smaller ionization power b) Greater ionization power c) Equal ionization power d) None of the above

A

11.

Gamma-rays are: a) Electromagnetic waves c) Having high penetrating power

D

12.

13.

b) High energy photons d) All of the above

The penetrating power of  -rays is: a) Greater than  -rays c) Equal to  -rays and  -rays

b) Smaller than  -rays and  -rays d) None of the above

The penetrating power of  –particles is: a) Less than  -particles c) Equal to  -particles

b) Greater than  -particles d) None of the above

A

B

14.

Which of the following radiations are highly penetrating: a)  -particles b)  -particles c)  -rays d) None of the above

C

15.

In pair-production, Gamma-ray photon is converted into: a) An electron b) A proton c) A positron d) A pair of electron and positron

D

Bahadur Ali Qureshi

By Usman khan

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PHYSICS

CHAPTER # 20 Nuclear Radiation

16.

17.

The range of  –radiation is: a) Very small c) Not specific

b) Very high d) Zero

Capture of a neutron by a nucleus produces: a) Radio isotope c) Helium

b) Proton d) Deutron

C

A

18.

Which of the following is electromagnetic in nature: a)  -rays b)  -rays c) Gamma rays d) Cathode rays

C

19.

Which of the following materials is used for shielding  -radiations? a) Wood b) Lead c) Air d) All of the above

B

20.

Which of the following is not a radiation detector? a) Wilson cloud chamber c) Cyclotron

C b) Geiger counter d) Solid state detector

Wilson cloud chamber is an instrument used for: a) Accelerating negatively charged particles c) Making the path of ionizing particle visible

b) Accelerating positively charged particles d) All of the above

21.

C

22.

Which of the following is used to produce ions of high energy? a) A cyclotron b) A betatron c) A Wilson cloud chamber d) A Geiger counter

A

23.

A solid state detector basically consists of a: a) Silicon crystal c) Transistor

B b) Pn-junction diode d) Germanium crystal

24.

In which of the following the paths of  and  -particles are observed: a) Geiger counter b) Cyclotron c) Wilson cloud chamber d) Betatron

C

25.

Geiger counter is not suitable for: a) Slow counting c) Slow and fast counting

B b) Fast counting d) None of the above

26.

Which of the following can be used for fast counting and operating at a low voltage: a) Wilson cloud chamber b) Geiger counter c) Scintillation counter d) Solid state detector

D

28.

Which of the following is the most useful tracer: a) Iodine-131 c) Carbon-14

C

29.

An  -particle ionizes the atom: a) Through electrostatic repulsion c) Through direct collision

b) Cobalt-60 d) Strontium-90 B b) Through electrostatic attraction d) Through gravitational attraction

30.

A-3 Mev  -particle can penetrate through an aluminium foil about: a) 65 mm b) 56 mm c) 6.5 mm d) 0.065 mm

C

31.

The range of 7.7 Mev  -particle in air is about: a) 10 cm c) 17 cm

D b) 20 cm d) 7 cm

 -particle can penetrate in aluminium foil of: a) 0.08 mm thickness c) 0.04 mm thickness

b) 0.4 mm thickness d) 0.05 mm thickness

32.

Bahadur Ali Qureshi

By Usman khan

C

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PHYSICS

CHAPTER # 20 Nuclear Radiation

33.

34.

Thyroid concave is cured by: a) Carbon-14 c) Iodine-131 The  -particle has: a) An erratic or zigzag path c) Circular path

C b) Sodium-24 d) Caesium-137 A b) Curved path d) Elliptical path

35.

Alpha radiation are advised for the treatment of skin of a patient because: a) They are highly ionizing b) They are helium nuclei c) They are less penetration d) They are positively charged

C

36.

 -particle has penetration power: a) 100 times more than the of an  -particle c) 1000 times less than of an  -particle

A b) 100 times has than that of an  -particle d) 10 times more than that of an  -particle

37.

Capture of a neutron by a nucleus results in the formation of: a) Tritium b) Radio isotope c) Deutron d) Proton

B

38.

An alpha particle has a charge of: a) + 2e c) +e

A b) - 2e d) -e

Gamma rays are: a) Electromagnetic radiation c) All of the above

b) High energy photons d) None of the above

39.

C

40.

Why gamma radiation’s are used to kill bacteria to sterilize surgical equipment etc: a) Because they are charge less b) Because they are mass less c) Because they are highly penetrating d) All of the above

D

41.

 -particles are highly ionizing due to: a) Their greater energy c) Their high charge and low speed

C b) Their greater mass d) Their greater density

The interaction with matter depends on: a) The mass of the particle c) Charge of the above

b) Energy of the particle d) All of the above

42.

D

43.

 -rays have penetration power: a) Less than  –rays and  –rays b) More than  –rays and  –rays c) Equal to  –rays and  –rays d) Sometimes greater and sometimes smaller than  –rays and  –rays

B

44.

Pair production can take place only with: a) X-rays c)  -rays

C b) Heat radiations d) Ultraviolet rays

45.

Beta particles are much less ionizing than alpha particles because of: a) Their smaller mass b) Their smaller energy c) Their smaller charge and large speeds d) They’re coming out of the nuclei

C

46.

Pair production can not take place in vacuum as: a) Mass is not conserved c) Momentum is not conserved

C b) Energy is not conserved d) Charge is not conserved

47.

 -particles posses greater penetration power than that of  -particles duet to its: a) Smaller ionization power b) Greater ionization power c) Neither greater nor smaller ionization power d) The same ionization power

A

48.

The process of making the gas non-conducting immediately after the passage of ionizing particle through the tube is called: a) Gaseous discharged b) De-Excitation of discharge c) Quenching of discharge d) Excitation of discharge

C

Bahadur Ali Qureshi

By Usman khan

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PHYSICS

CHAPTER # 20 Nuclear Radiation

49.

50.

51.

 -rays lose their energy by: a) Pair production c) Photo-electric effect

b) Compton effect d) All of the above

Alpha particles are highly ionizing because of: a) Their high charge and low speeds c) Their larger energy

b) Their greater mass d) Their constituents

 -rays are electromagnetic waves like: a) X-rays c) Heat waves

D

A

D b) Light waves d) All of the above

52.

Which one of the following radiation is extremely penetrating? a) Neutrons b)  -rays c)  -rays d)  -rays

D

53.

The  -particle does not travel far enough in air: a) Due to its high charge c) Due to its intense ionization

C b) Duet to its large mass d) Due to its penetration

54.

 -radiations are used to sterilize surgical equipment in order to kill bacteria because: a) They are mass less b) They are charge less c) They have high penetration power d) All of the above

D

56.

Gamma rays are: a) High energy photons c) Electromagnetic waves

D b) Highly penetrating power d) All of the above

57.

 -radiation is used for the treatment of skin of a patient due to: a) Highly ionizing power b) Low penetration power c) Positively charged particles d) Helium nuclei

B

58.

 -particles produce fluorescence in: a) Calcium tungstate c) Barium platinum cyanide

D b) Zinc sulphide d) All of the above

60.

A device for producing ion of high energy is called: a) A Betatron b) A Geiger counter c) A Cyclotron d) A mass spectrograph

C

61.

A solid state detector mainly consists of a: a) Germanium Crystal c) Silicon diode

C b) Silicon crystal d) Transistor

Geiger Muller counter always uses: a) Argon and Alcohol c) Different gases at different pressures

b) Bromine mixed with neon d) Argon only

Geiger counter is a device to detect: a) Mass c) Charge

b) Momentum d) Radiation

One micro curie is: a) A thousand curies c) A million curie

b) A thousand of a curie d) A millionth of a curie

In 1911, cloud chamber was invented by: a) Muller c) Lawrence

b) Rutherford d) C.T.R. Wilson

A Wilson cloud chamber uses: a) Super heated liquid c) Supersaturated vapour

b) Vapour’s d) Saturated vapours

63.

64.

65.

66.

67.

Bahadur Ali Qureshi

By Usman khan

A

D

D

D

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C

PHYSICS

CHAPTER # 20 Nuclear Radiation

68.

69.

70.

It is a drawback of G.M. counter: a)  -particle counter c) Fast counting

b) Jon counter d)  -ray counter

C

Roentgen is the unit of: a) Heat radiation c) Light radiation

b) Electromagnetic radiation d) Unit of radiation

The most useful tracer is: a) Iodine-131 c) Carbon-14

b) Strontium-90 d) Cobalt-60

D

C

71.

A device that may be used to detect the passage of a single, light energy charged particle is called a: a) Mass spectrograph b) Wilson’s cloud chamber c) Geiger counter d) Dosimeter

C

72.

Which of the following will be a better shield against  -rays: a) Air b) Ordinary water c) Heavy water d) Lead

D

73.

Wilson cloud chamber is an instrument used for: a) Accelerating + lively charged particles c) Making the path of ionizing particle visible

b) Accelerating – lively charged particles d) All of them

C

74.

In Wilson cloud chamber, the  -particle leave: a) Straight and continuous tracks c) Thin and continuous tracks

b) No definite tracks d) Thin and discontinuous tracks

D

76.

A Geiger counter counts radioactive particles by: a) Amplifying the sound theory make as theory strike the walls of tube b) Emitting detectable light pulses when struck c) Collecting and measuring the charges of the particles d) Under going a chemical reaction with each incident particle

D

77.

A device for actually observing the paths of alpha and beta particles is called a: a) Cyclotron b) Geiger counter c) Mass spectrogragh d) Wilson’s cloud chamber

D

78.

For producing one ion pair during ionization the energy used up is: a) 40 eve b) 70 eve c) 35 ev d) 95 ev

C

79.

Geiger counter is widely used in: a) Optical experiments c) Mechanical experiments

D b) Laser experiments d) Radioactivity experiments

80.

Specially designed solid state detector can be used to detect: a) Alpha rays only b) Beta – rays only c) Gamma rays only d) X – rays

C

81.

Geiger counter was designed by: a) Rutherford and Thomson c) Lawrence and Geiger

D b) Geiger and Wilson d) Geiger and Muller

82.

By producing radiographs  -rays can be used to detect: a) Void or fissure in the metal casting b) Cracks in metal plates of welding faults c) Faults within the heavy machinery like jet engine d) All of the above

D

83.

Geiger counter is suitable: a) For extremely fast counting c) For slow counting

C

84.

In a Wilson cloud chamber, the alpha particles have: a) Thin and discontinuous tracks b) Irregular cloud tracks c) Dense straight and continuous tracks d) No definite tracks

Bahadur Ali Qureshi

By Usman khan

b) For fast counting d) For fast and slow counting

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C

PHYSICS

CHAPTER # 20 Nuclear Radiation

85.

Which one of the following detectors can count fast and operate at low voltage: a) Geiger counter b) Wilson cloud chamber c) Solid state detector d) Scintillation counter

C

86.

Draw back of Geiger counter is: a) Very high voltage c) Both ‘a’ and ‘b’

C

87.

88.

 -rays show _______ in Wilson cloud chamber: a) Thin and discontinuous tracks c) Dense straight and continuous tracks

b) Irregular cloud tracks d) No definite tracks

I31 used for the remedy of: a) Skin cancer c) Lungs cancer

b) Thyroid disabilities d) None

Bahadur Ali Qureshi

By Usman khan

b) Slow counting d) None D

B

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