Uses of Radioactive Substances

Q.

Ionization energy is directly proportional to the atomic radius and the effective nuclear charge. (True/False)

1. True

2. False

Q.

State the use of radioactive isotopes in agriculture.

Q. The radioactive isotope used for the detection of small tumours in our body is _______.

1. cobalt-60
2. boron-10
3. arsenic-74
4. iodine-131

Q. Match the following radioactive isotopes with their uses.

1. Watch
2. Food preservation
3. Hyperthyroidism
4. Bone cancer

Q.

An isotope of iodine is used for making a tincture of iodine

1. True
2. False

Q. Radioactive isotopes are used in:

1. industrial field
2. agriculture
3. medical science
4. food preservation

Q. Phosphorus-32 is used to cure bone cancer.

1. True
2. False

Q. A radiographer was asked to detect the cracks in cast iron articles. Which of the following rays and radioactive isotopes he should use for this detection?

1. Alpha rays, cobalt-60
2. Beta rays, iridium-192
3. Gamma rays, cobalt-60
4. Beta rays, iridium-192

Q.

What is radioactive sugar?

Q.

A radioactive substance emits:

1. Simultaneously $\mathrm{\alpha },\mathrm{\beta }\mathrm{and}\mathrm{\gamma }$ radiations

2. $\mathrm{\alpha }$-radiations or $\mathrm{\beta }$-radiations

3. In the order of $\mathrm{\alpha },\mathrm{\beta }\mathrm{and}\mathrm{\gamma }$ particles

4. X-rays and $\mathrm{\gamma }$-rays

Q.

How we can change a proton into neutron and a neutron into proton? Is it possible?

Q. Artificial radioactive elements are present in:

1. $s$-block
2. $p$-block
3. $d$-block
4. $f$-block

Q. Which of the following radioactive substance is mixed with phosphor to make luminescent paint?

1. Tritium
2. Iodine
3. Samarium
4. Strontium

Q. Which radioactive isotope is used to detect tumours?

1. ${}^{24}Na$
2. ${}^{131}I$
3. ${}^{74}As$
4. ${}^{60}Co$

Q.

Write uses of radioactive isotopes in the Industrial field and in medical science?

Q.

What does half-life mean?

Q. Iron articles become reddish brown when exposed to air. It is due to the formation of:​

1. Iron sulphate
2. Iron oxide
3. Iron chloride
4. Iron nitrate

Q. Mention the uses of isotopes.

Q.

Give important application of isotopes.

Q. A radioactive isotope has a half-life of 10 days. If today 125 mg is left over, what was its original weight 40 days earlier?

1. 2 g
2. 1 g
3. 600 mg
4. 1.5 g

Q.

Write uses of radioactive isotopes in the Industrial field and in medical science?

Q. Write the uses of radioactive substances.

Q.

Isotopes of an element contains same number of :

1. Electrons

2. Protons

3. Neutrons

4. Electrons and protons.

Q.

Radioactivity has various uses in medical science.

1. True

2. False

Q.

Explain the following:

An element has atoms with different mass numbers.

Q.

An isotope of iodine is used for making tincture iodine, which is used as a medicine

1. True
2. False

Q. In which of the following nuclear reaction neutrons is emitted?

1. ${}_{13}A{l}^{27}+{}_{2}H{e}^4\to {}_{15}{P}^{30}$
2. ${}_6{C}^{12}+{}_1{H}^1\to {}_7{N}^{13}$
3. ${}_{15}{P}^{30}\to {}_{14}S{i}^{30}$
4. ${}_{96}A{m}^{241}+{}_{2}H{e}^4\to {}_{97}B{k}^{245}$

Q. Which among the following is wrong about isodiapheres?

1. All are correct
2. They have the same difference of neutrons and protons or same isotopic number
3. Nuclide and its decay product after $\alpha$-emission are isodiapheres
4. ${}_Z{A}^M⟶$ ${}_{Z-2}{B}^{M-4}{+}_2{He}^4$ '$A$' and '$B$' are isodiapheres

Q. The starting isotope and the end product isotope of actinium series are:

1. ${}_{92}^{235}U$ and ${}_{82}^{208}Pb$
2. ${}_{92}^{235}U$ and ${}_{82}^{207}Pb$
3. ${}_{88}^{227}Ac$ and ${}_{82}^{208}Pb$
4. ${}_{92}^{238}U$ and ${}_{82}^{207}Pb$

Q.

Name or state the following:

Atoms of the same element differing in mass numbers.