A radioactive substance emits 
(a) α-rays                (b) β-rays
(c) γ-rays                 (d) All of these

Concept Questions :-

Types of decay
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The large scale destruction, that would be caused due to the use of nuclear weapons is called 
(a) Nuclear holocaust
(b) Thermo-nuclear reaction
(c) Nuetron reproduction factor
(d) None of these

Concept Questions :-

Nuclear reactor
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


An atomic nucleus Th90232 emits several α and β radiations and finally reduces to Pb82208. It must have emitted

(a) 4α and 2β              (b) 6α and 4β
(c) 8α and 24β            (d) 4α and 16β

Concept Questions :-

Types of decay
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after 5 years will be

(a) 132              (b) 15
(c) 12                (d) 45

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


If half-life of a substance is 3.8 days and its quantity is 10.38 gm. Then substance quantity remaining left after 19 days will be 
(a) 0.151 gm             (b) 0.32 gm
(c) 1.51 gm               (d) 0.16 gm

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Which is the correct expression for half-life

(a) t1/2=log2                  (b) t1/2=λlog2
(c) t1/2=λlog2(2.303)      (d) t1/2=2.303 log 2λ

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


A nucleus AZA emits an α-particle. The resultant nucleus emits a β+ particle. The respective atomic and mass no. of the final nucleus will be 
(a) Z – 3, A – 4            (b) Z – 1, A – 4
(c) Z – 2, A – 4            (d) Z, A – 2

Concept Questions :-

Types of decay
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The activity of a radioactive sample is 1.6 curie and its half-life is 2.5 days. Its activity after 10 days will be

(a) 0.8 curie       (b) 0.4 curie
(c) 0.1 curie       (d) 0.16 curie

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


In a mean life of a radioactive sample 
(a) About 1/3 of substance disintegrates
(b) About 2/3 of the substance disintegrates
(c) About 90% of the substance disintegrates
(d) Almost all the substance disintegrates

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Three fourth of the active decays in a radioactive sample in 3/4 sec. The half life of the sample is 
(a) 12 sec            (b) 1 sec
(c) 38 sec            (d) 34 sec

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: