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Question-1
Emission of hot free electron from a metal surface is called
(A)
Radioactivity
(B)
Thermionic emission
(C)
Conductivity
(D)
Convection
Question-2
The workers handling which substances should wear special form badger?
(A)
α radiations
(B)
β Radiations
(C)
γ Radiations
(D)
All the above
Question-3
Which radiations have the most penetrating power?
(A)
α radiations
(B)
β Radiations
(C)
γ Radiations
(D)
U – V radiations
Question-4
Which part of a hot cathode ray tube give a fire beam of electrons to it?
(A)
Electron gem
(B)
Deflecting system
(C)
Fluorescent screen
(D)
All the above
Question-5
Which radiations cause maximum ionization?
(A)
α radiations
(B)
β radiations
(C)
γ radiations
(D)
Infrared radiations
Question-6
Which of the following is a method to find the age of an animal or plant fossil?
(A)
Isotopes
(B)
Isobars
(C)
Carbon dating
(D)
Radioactivity
Question-7
Controlled exposure of which radiations is used on the treatment of cancer?
(A)
α radiations
(B)
β Radiations
(C)
γ Radiations
(D)
U – V radiations
Question-8
Which part of a hot cathode ray tube converts electric signal to visual pattern?
(A)
Electron gem
(B)
Deflecting system
(C)
Fluorescent screen
(D)
All the above
Question-9
Which radiations are not deflected in electric and magnetic fields?
(A)
α Particles
(B)
β Particles
(C)
γ Particles
(D)
All the above
Question-10
Radioisotope is used on the treatment of
(A)
Cancer
(B)
AIDS
(C)
Lever Xerosis
(D)
All the above
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Cambridge Secondary Grade 9
IGCSE
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