A nucleus represented by the symbol ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$ has:

1.	Z protons and A –Z neutrons
2.	Z protons and A neutrons
3.	A protons and Z –A neutrons
4.	Z neutrons and A –Z protons

M_P denotes the mass of a proton and M_n that of a neutron. A given nucleus, of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by:
(c is the velocity of light )

1. M(N, Z) = NM_n + ZM_P + Bc²

2. M(N, Z) = NM_n + ZM_P – B/c²

3. M(N, Z) = NM_n + ZM_P + B/c²

4. M(N, Z) = NM_n + ZM_P – Bc²

If a radioactive element emitted one α and one β-particle, then the mass number of the daughter element is:

1.  decreased by 4

2.  increased by 4

3.  decreased by 2

4.  increased by 2

Which of the following are suitable for the fusion process?

If a deuteron is bombarded on a ₈O¹⁶ nucleus then an α-particle is emitted. The product nucleus is:

1. ₇N¹³

2. ₅B¹⁰

3. ₄Be⁹

4. ₇N¹⁴

Which rays contain (+ve) charged particle:
1.  α-rays
2.  β-rays
3.  γ-rays
4.  X-rays

$\mathrm{If\; X}(n,$ $\alpha$ $)\; converts\; into$ $$ ${}_3{}^{7}Li$, then X will be: 

1. ${}_5{}^{10}B$

2.  ${}_5{}^{9}B$

3. ${}_4{}^{11}Be$

4. ${}_2{}^{4}He$

$M_n$ $and$ ${M_P}_{}$ represent the mass of the neutron and proton respectively. An element having mass M has N neutrons and Z-protons, then the correct relation will be: 

1. $M$ $<$ $\{N.M_n$ $+$ $Z.M_P\}$ 

2. $M$ $>$ $\{N.M_n$ $+$ $Z.M_P\}$

3. $M$ $=$ $\{N.M_n$ $+$ $Z.M_P\}$

4. $M$ $=N\{M_n$ $+$ $M_P\}$

The energy released in nuclear fission is due to:

Solar energy is mainly caused due to: