Artificial Radioactivity

Q. The first artificial disintegration of an atomic nucleus was achieved by

1. Geiger
2. Wilson
3. Madame curie
4. Rutherford
5. Soddy

Q.

What are the three types of ionizing radiation?

Q.

The half-life of ${}_{238}{}^{92}\mathrm{U}$ undergoing α-decay is $4.5\times {10}^{-9}$. What is the true activity initial of $1\mathrm{gm}$ of the sample?

Q. A radioactive isotope $X$ with half-life of $6.93\times {10}^9$ years decay to $Y$ which is stable. A sample of rock from the moon was found to contain both the elements $X$ and $Y$ in the mole ratio $1:7$. What is the age of the rock?

1. $2.079\times {10}^{10}$ years
2. $1.94\times {10}^{10}$ years
3. $1.33\times {10}^{10}$ years
4. ${10}^{10}$ years

Q. Which one of the following nuclear transformation is (n, p ) type

1. ${}_{33}A{s}^{75}+2H{e}^4{\to }_{35}B{r}^{78}{+}_0{n}^1$
2. ${}_{3}L{i}^7{+}_1{H}^1{\to }_{4}B{e}^7{+}_0{n}^1$
3. ${}_{83}B{i}^{209}{+}_1{H}^2{\to }_{84}P{0}^{210}{+}_0{n}^1$
4. ${}_{21}S{c}^{45}{+}_0{n}^1{\to }_{20}C{a}^{45}{+}_1{H}^1$

Q. A positron is emitted from ${}_{11}^{23}\text{Na}$ . The ratio of the mass number and the atomic number of the resulting nuclide is :

1. $\frac{22}{10}$
2. $\frac{22}{11}$
3. $\frac{23}{10}$
4. $\frac{23}{12}$

Q. If ${}_{92}{U}^{235}$ nucleus absorbs a neutron and disintegrates in ${}_{54}X{e}^{139},{}_{38}S{r}^{94}$ and X, then what will be the product X?

1. 2-neutrons
2. $\alpha$ -particle
3. $\beta$ -particle
4. 3-neutrons

Q. Which one of the following nuclear transformation is (n, p ) type

1. ${}_{3}L{i}^7{+}_1{H}^1{\to }_{4}B{e}^7{+}_0{n}^1$
2. ${}_{33}A{s}^{75}+2H{e}^4{\to }_{35}B{r}^{78}{+}_0{n}^1$
3. ${}_{83}B{i}^{209}{+}_1{H}^2{\to }_{84}P{0}^{210}{+}_0{n}^1$
4. ${}_{21}S{c}^{45}{+}_0{n}^1{\to }_{20}C{a}^{45}{+}_1{H}^1$

Q. If the decay constant of radioactive radium is $4.28\times {10}^{4}year{s}^{-1}$, this half-life will be:

1. 2000 years
2. 1240 years
3. 63 years
4. 1620 years

Q. The missing particle in the reaction ${}_{92}^{235}U{+}_0^{1}n{\to }_{56}B{a}^{146}+\cdots +3_0^{1}n$ is:

1. ${}_{32}^{87}Ge$
2. ${}_{35}^{89}Br$
3. ${}_{36}^{87}Kr$
4. ${}_{35}^{86}Br$

Q. Identify the type of change occurs in the following reaction:

1. Chemical Change
2. Radioactive change
3. None of these
4. Physical change

Q. Which ones of the following statements are true for given reaction?
${}_4{}^{9}Be{+}_1{}^{3}H{\to }_5{}^{11}B{+}_0{}^{1}n$

1. It is a fusion reaction
2. It is natural radioactive decay
3. Total proton count is conserved
4. Total neutron number is conserved

Q. Which ones of the following reactions are artificial radioactive decay?

1. ${}_{92}{}^{238}U{\to }_{90}{}^{234}Th+\alpha$
2. ${}_{12}{}^{24}Mg+{\beta }^{+}{\to }_{13}{}^{24}Al$
3. ${}_4{}^{9}Be{+}_2{}^{4}He{\to }_6{}^{12}C+n$
4. ${}_{92}{}^{238}U{\to }_{90}{}^{234}Th+\beta$

Q. Which ones of the following reactions are artificial radioactive decay?

1. ${}_{92}{}^{238}U{\to }_{90}{}^{234}Th+\alpha$
2. ${}_{12}{}^{24}Mg+{\beta }^{+}{\to }_{13}{}^{24}Al$
3. ${}_4{}^{9}Be{+}_2{}^{4}He{\to }_6{}^{12}C+n$
4. ${}_{92}{}^{238}U{\to }_{90}{}^{234}Th+\beta$

Q. Cesium-137 decays to barium-137. The correct reactions for following decay process is :

1. ${}_{55}^{137}Cs{⟶}_{56}^{137}Ba{+}_{-1}^{0}e$
2. ${}_{55}^{137}Cs{⟶}_{56}^{137}Ba{+}_1^{0}e$
3. ${}_{55}^{137}Cs{⟶}_{56}^{137}Ba{+}_{-1}^{1}e$
4. None of these

Q. The first artificial disintegration of an atomic nucleus was achieved by

1. Geiger
2. Wilson
3. Madame curie
4. Rutherford
5. Soddy

Q. Radioactive substance becomes ${\left(\frac{1}{16}\right)}^{th}$ of the original in 80 minutes.Find half-life.

1. $40min$
2. $20min$
3. $60min$
4. $5min$

Q.

Assertion : Protones are more effective than neutrons of equal energy in causing artificial disintegration of atoms.

Reason : Neutrons are neutral they penetrate the nucleus.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If both assertion and reason are true but reason is not the correct explanation of the assertion.
3. If assertion is true but reason is false.
4. If the assertion and reason both are false.
5. If assertion is false but reason is true.

Q. Radon-222 decays to polonium-218. The correct reactions for following decay process is:

1. ${}_{86}^{222}Rn{⟶}_{84}^{218}Po{+}_2^{4}He$
2. ${}_{86}^{222}Rn{⟶}_{84}^{218}Po{+}_3^{4}He$
3. None of these
4. ${}_{86}^{222}Rn{⟶}_{84}^{218}Po{+}_2^{3}He$

Q. 10 g of a radioactive element loses 8.75 g in 9 days. Thus, the half-life is x days.Find out the value of x:

1. x=3
2. x=5
3. None of these
4. x=2

Q. Indium-110 decays to cadmium-110. The correct reactions for following decay process is:

1. ${}_{49}^{110}In{⟶}_{48}^{110}Cd{+}_1^{1}e$
2. None of these
3. ${}_{49}^{110}In{⟶}_{48}^{110}Cd{+}_1^{-1}e$
4. ${}_{49}^{110}In{⟶}_{48}^{110}Cd{+}_1^{0}e$

Q. $30g$ of Magnesium and $30g$ of oxygen are reacted, then the residual mixture contains:

1. $45g$ of Magnesium oxide and $15g$ of oxygen
2. $50g$ of Magnesium only
3. $50g$ of Magnesium oxide and $10g$ of oxygen
4. $40g$ of Magnesium oxide and $20g$ of oxygen

Q. ${}_6{C}^{14}$ is formed from ${}_7{N}^{14}$ in the upper atmosphere by the action of the fundamental particle

1. Neutron
2. Electron
3. Proton
4. Positron

Q. The first artificial disintegration of an atomic nucleus was achieved by

1. Rutherford
2. Madame curie
3. Geiger
4. Wilson
5. Soddy

Q.

Assertion : Protones are more effective than neutrons of equal energy in causing artificial disintegration of atoms.

Reason : Neutrons are neutral they penetrate the nucleus.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If assertion is true but reason is false.
3. If both assertion and reason are true but reason is not the correct explanation of the assertion.
4. If the assertion and reason both are false.
5. If assertion is false but reason is true.