Question

In Column - I, Consider each process just before and just after it occurs. Initial system is isolated from all other bodies. Considering all product particles (even those having rest mass zero ) in the system , Match the system in column-I with the result they produce in column - II.

$\begin{array}{cc}\text{Column - I}& \text{Column - II}\\ \text{(A) Spontaneous radioactive decay of an}\text{uranium nucleus initially at rest as}{\text{given by reaction}}_{92}^{238}U{\to }_{90}^{234}Th{+}_2^{4}He+...& \text{(p) Number of protons is increased}\\ \text{(B) Fusion reaction of two hydrogen nuclei}{\text{as given by reaction}}_1^{1}H{+}_1^{1}H{\to }_1^{2}H+....& \text{(q) Momentum is conserved}\\ \text{(C) Fission of}{U}^{235}\text{nucleus initiated by a}\text{thermal neutron as given by reaction}{}^{}{}_0^{1}n{+}_{92}^{235}U{\to }_{56}^{144}Ba{+}_{36}^{89}Kr+3_0^{1}n+....& \text{(r)Mass is converted to energy or vice versa}\\ \text{(D)}\beta -\text{decay (negative beta decay)}& \text{(s) Charge is conserved}\end{array}$

• A. $\text{(a)}\to \text{(q,r,s)};\text{(b)}\to \text{(q,r,s)};\text{(c)}\to \text{(q,r,s)};\text{(d)}\to \text{(p,q,r,s)}$
• B. $\text{(a)}\to \text{(q,r)};\text{(b)}\to \text{(q,r,s)};\text{(c)}\to \text{(q,r)};\text{(d)}\to \text{(q,r,s)}$
• C. $\text{(a)}\to \text{(q,s)};\text{(b)}\to \text{(q,s)};\text{(c)}\to \text{(q,r,s)};\text{(d)}\to \text{(p,q,r,s)}$
• D. $\text{(a)}\to \text{(q,r)};\text{(b)}\to \text{(q,r,s)};\text{(c)}\to \text{(q,r)};\text{(d)}\to \text{(p,r,s)}$

Answer 1

The correct option is A $\text{(a)}\to \text{(q,r,s)};\text{(b)}\to \text{(q,r,s)};\text{(c)}\to \text{(q,r,s)};\text{(d)}\to \text{(p,q,r,s)}$

(A) In the given spontaneous radioactive decay, the number of protons remain constant and all conservation principles are obeyed.

(B) In fusion reaction of two hydrogen nuclei , a proton is decreased as positron shall be emitted in the reaction. All the three conservation principles are obeyed.

(C) In the given fission reaction the number of protons remain constant and all conservation principles are obeyed.

(D) In beta negative decay, a neutron transforms into a proton within the nucleus and the electron is ejected out.