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Question-1
The harmful radioactive effects in the absence of any actual radioactive materials are called
(A)
Isotopes
(B)
Carbon dating
(C)
Back ground radiations
(D)
Ozone layer
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
All radioactive substances should be put in
(A)
Metal containers
(B)
Lead containers
(C)
Carbon containers
(D)
Clary containers
Question-4
Which of the following radiations are same as helium nuclei?
(A)
Alpha radiations
(B)
Beta radiations
(C)
Gamma radiations
(D)
Ultraviolet radiations.
Question-5
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-6
Atoms which have the same number of protons but different numbers of neutrons as that of the element are called its
(A)
Nuclides
(B)
Isobars
(C)
Isotopes
(D)
Positrons
Question-7
Which radiations are not deflected in electric and magnetic fields?
(A)
α Particles
(B)
β Particles
(C)
γ Particles
(D)
All the above
Question-8
Which radiations cause maximum ionization?
(A)
α radiations
(B)
β radiations
(C)
γ radiations
(D)
Infrared radiations
Question-9
Which of the following is used to flow electric current in vacuum?
(A)
Radioactivity
(B)
Conductivity
(C)
Thermionic emission
(D)
Convection
Question-10
Which type of harmful radiations are emitted by nuclear wastes.
(A)
α radiations
(B)
β radiations
(C)
γ radiations
(D)
Beta and gamma radiations
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Cambridge Secondary Grade 9
IGCSE
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