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Q:

A Radioactive subatance emits

A) alpha particles B) beta particle
C) gamma particle D) all of the three
 
Answer & Explanation Answer: D) all of the three

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Q:

The alpha-particles are

A) high energy electrons B) positively charged hydrogen irons
C) high energy x ray radiations D) double positively charged helium nuclei
 
Answer & Explanation Answer: D) double positively charged helium nuclei

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Q:

The activity of rradioisotope change with

A) temperature B) pressure
C) chemical environment D) None of these
 
Answer & Explanation Answer: D) None of these

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Q:

Natural radioactivity was discovered by

A) Rutherford B) Becquerel
C) Curie D) Schmidt
 
Answer & Explanation Answer: B) Becquerel

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Q:

The fundamental particles present in equal numbers in neutral atoms are

A) protons and electrons B) neutrons and electrons
C) protons and neutrons D) protons and positrons
 
Answer & Explanation Answer: A) protons and electrons

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Q:

The discovery of neutron became very late because

A) it is present in nucleus B) it is a fundamental particle
C) it does not move D) it does not carry any charge
 
Answer & Explanation Answer: D) it does not carry any charge

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Q:

Neutron was discovered by

A) J.J.Thomson B) Chadwick
C) Rrutherford D) Priestley
 
Answer & Explanation Answer: B) Chadwick

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Q:

Cathode rays have

A) mass only B) charge only
C) no mass and no charge D) mass and charge both
 
Answer & Explanation Answer: D) mass and charge both

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