nuclear physics and conductivity - Category wise Question and Answer Practice Test with Solutions

Question : 21 [IAS (Pre) 2001]

The half-life of a radioactive substance is 10 days; it means there will be

a) Decay of 3/4 part of substance in 20 days

b) Complete decay of substance in 40 days

c) Complete decay of substance in 20 days

d) Decay of 1/4 part of substance in 5 days

Question : 22 [UPPCS (Mains) 2004]

Which one of the following is not correctly matched?

a) Harishchandra Research Institute - Chennai

b) Atomic Minerals Directorate for Exploration and Research - Hyderabad

c) Indira Gandhi Centre for Atomic Research - Kalpakkam

d) Saha Institute of Nuclear Physics – Kolkata

Question : 23 [PCS (Pre) 2012]

Which one of the following element is used in solar cells?

a) Astatine

b) Cerium

c) Silicon

d) Vanadium

Question : 24 [UPPCS (Mains) 2009]

A breeder reactor is that which

a) Produces more fissionable material than it burns

b) Uses only heavy water

c) Does not require fissionable material at all

d) None of the above

Question : 25 [PSC (Pre) 2016]

Which one of the following metals is used as semi-conductor in transistors?

a) Germanium

b) Graphite

c) Copper

d) Silver