Physics MCQs

Page No. 39

An alpha particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus ?


a224 – 84


b220 – 80


c222 – 86


d226 – 87


View Answer 222 – 86

Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is______________?


a Smaller


bGreater than 82


cSame


dSometimes smaller some times greater


View Answer Greater than 82

A mass spectrograph (spectrometer) sorts out____________?


aMolecules


bIons


cElements


dIsotopes


View Answer Elements

Nuclei having the same mass number but different atomic number are____________?


a Isotopes


bIsobars


c Isotones


dIsomers


View Answer Isobars

Mass of neutron is________________?


a 1.67 x 10-31 kg


b1.67 x 10-27 kg


c 9.1 x 10-31 kg


d1.67 x 10-19 kg


View Answer 1.67 x 10-27 kg

A particle having the mass of an electron and the charge of a proton is called a______________?


aAntiproton


bPositron


cGamma rays


dPhoton


View Answer Positron

The charge on neutron is_______________?


a Plus 1.6 x 10-19C


bZero


cMinus 1.6 x 10-19C


dNo definite charge


View Answer Zero

The charge on an electron was determine by ________________?


aAmpere


bMaxwell


cMillikan


dThomson


View Answer Millikan

Which one of the following radiations possesses maximum velocity ?


a α-rays


b β-rays


c γ-rays


dAll of above have the same speed


View Answer γ-rays

The fission chain reaction in a nuclear reactor can be controlled by introducing _______________?


a Iron rods


bGraphite rods


cCadmium rods


dPlatinum rods


View Answer Cadmium rods

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