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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
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-3
A hydrogen atom minus an electrons forms
(A)
Neutron
(B)
Electron
(C)
Proton
(D)
Positron
Question-4
Which part of a hot cathode ray tube converts electric signal to visual pattern?
(A)
Electron gun
(B)
Deflecting system
(C)
Fluorescent screen
(D)
All the above
Question-5
Subatomic particles with the same mass as an electron but with opposite ( positive) charge are called
(A)
Isobars
(B)
Nuclides
(C)
Positrons
(D)
Isotopes
Question-6
Which radiations cause maximum ionization?
(A)
α radiations
(B)
β radiations
(C)
γ radiations
(D)
Infrared radiations
Question-7
Which of the following is used to flow electric current in vacuum?
(A)
Radioactivity
(B)
Conductivity
(C)
Thermionic emission
(D)
Convection
Question-8
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-9
The workers handling which substances should wear special form badger?
(A)
α radiations
(B)
β Radiations
(C)
γ Radiations
(D)
All the above
Question-10
Which radiations have the most penetrating power?
(A)
α radiations
(B)
β Radiations
(C)
γ Radiations
(D)
U – V radiations
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Cambridge Secondary Grade 10
IGCSE
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