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Question Bank No: 2

1. Which is the respective number of $α$ and $β$ particles emitted in the following radioactive decay? $X_{92}^{200} \to Y_{80}^{168}$

a)		6 and 8
b)		6 and 6
c)		8 and 8
d)		8 and 6

2. In the given reaction $X_{Z}^{A} \to Y_{Z + 1}^{A} \to K_{Z - 1}^{A - 4} \to K_{Z - 1}^{A - 4}$ the radioactive radiations are emitted in the sequence

a)		$α, β, γ$
b)		$γ, α, β$
c)		$β, α, γ$
d)		$γ, β, α$

3. The packing fraction for $N_{7}^{14}$ isotop whose mass is 14.003u is

a)		${7.8 \times 10}^{- 3}$
b)		${2.1 \times 10}^{- 4}$
c)		1.0002
d)		0.9

4. The mass number of helium is 4 and that of sulphur is 32. The radius of sulphur nucleus is larger than helium by the factor of

a)		8
b)		$\sqrt{8}$
c)		4
d)		2

5. The binding energy per nucleon for deutron and an $α$ - particle are $x_{1}$ and $x_{2}$ repectively. The energy Q released in the reaction $H_{1}^{2} + H_{1}^{2} \to {He}_{2}^{4} + Q$ is

a)		${2 (x}_{1} - x_{2})$
b)		${2 (x}_{1} + x_{2})$
c)		${4 (x}_{1} + x_{2})$
d)		${4 (x}_{1} - x_{2})$

6. The binding energy per nucleon is maximum in the case of

a)		${He}_{2}^{4}$
b)		${Fe}_{26}^{56}$
c)		$B_{56}^{141}$
d)		$U_{92}^{235}$

7. $m_{p}$ and $m_{n}$ are masses of proton and neutron respectively. An element of mass M has Z protons and N neutrons. Then

a)		$M > {Zm}_{p} + {Nm}_{n}$
b)		$M < {Zm}_{p} + {Nm}_{n}$
c)		$M = {Zm}_{p} + {Nm}_{n}$
d)		$M = {Nm}_{p} + {Zm}_{n}$

8. The mass density of nucleus varies with mass number A as

a)		$A^{2}$
b)		$A^{1 / 3}$
c)		constant
d)		1/A

9. The energy equivalent of 1u is

a)		${1.6 \times 10}^{- 19} J$
b)		${6.2 \times 10}^{29} J$
c)		931MeV
d)		9.31 MeV

10. The packing fraction for ${}_{7}{N^{14}}$ isotope whose mass is 14.003 n is

a)		$7.8 \times 10^{- 3}$
b)		$2.1 \times 10^{- 4}$
c)		$1.0002$
d)		$0.009$