If radius of the ${}_{13}{}^{27}\mathrm{Al}$ nucleus is estimated to be 3.6 fermi then the radius of ${}_{52}{}^{125}Te$ nucleus be nearly

(a) 4 Fermi                                     (b) 5 Fermi

(c) 6 Fermi                                     (d) 8 Fermi

Concept Questions :-

Mass-energy equivalent
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Solar energy is mainly caused due to 

(1) fusion of protons during synthesis of heavier elements

(2) gravitational contraction

(3) burning of hydrogen in the oxygen

(4) fission of uranium present in the sun

Concept Questions :-

Mass-energy equivalent
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A sample of radioactive elements contains $4×{10}^{10}$ active nuclei. If half-life of element is 10 days, then the number of decayed nuclei after 30 days is 

(1) $0.5×{10}^{10}$                   (2) $2×{10}^{10}$

(3) $3.5×{10}^{10}$                   (4) $1×{10}^{10}$

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A and B are two radioactive substances whose half-lives are 1 and 2 years respectively. Initially 10 g of A and 1 g of B is taken. The time (approximate) after which they will have the same quantity remaining is

(1) 6.62 yr                (2) 5 yr                (3) 3.2 yr                   (4) 7 yr

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In radioactive decay process, the negatively charged emitted $\beta$-particles are

(a) the electrons present inside the nucleus

(b) the electrons produced as a result of the decay of neutrons inside the nucleus

(c) the electrons produced as a result of collisions between atoms

(d) the electrons orbiting around the nucleus

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A sample of radioactive element has a mass of 10 gm at an instant t = 0. The approximate mass of this element in the sample after two means lives in [CBSE PMT/PDT 2003]

(1) 3.70 gm             (2) 6.30 gm             (3) 1.35 gm           (4) 2.50 gm

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Given a sample of Radium-226 having half-life of 4 days. Find the probability, a nucleus disintegrates after 2 half lives [IIT-JEE 2006]

(1) 1              (2) 1/2            (3) 1.5             (4) 3/4

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Complete the equation for the following fission process-

${U}_{92}^{235}+{n}_{0}^{1}\to S{r}_{38}^{90}+........$

(1)                       (2) $X{{e}_{{}_{54}}^{145}}^{}$

(3) $X{{e}_{{}_{57}}^{142}}^{}$                                   (4) $X{{e}_{{}_{54}}^{142}}^{}+{n}_{0}^{1}$

Concept Questions :-

Nuclear binding energy
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A nucleus ruptures into two nuclear parts, which have their velocity ratio equal to 2:1. what will be the ratio of their nuclear size (nuclear radius) ? 

(1)               (2)              (3)                 (4)

Concept Questions :-

Nuclear binding energy
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The half-life of a radioactive material is 3h. If the initial amount is 300g, then after 18h, it will remain

(a) 4.68 g                                     (b) 46.8 g

(c) 9.375 g                                   (d) 93.75 g

Concept Questions :-