Chemistry - Radioactivity

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Question - 1

Consider the following statements with reference to X-rays

1. They produce heat when absorbed by matter.

2. They are generated when fast moving electrons strike a metal target.

3. They can penetrate through a thin sheet of aluminum.

Which of the statements given above are correct?

  • A 1,2 and 3
  • B 1 and 2
  • C 2 and 3
  • D 1 and 3

Question - 2

Which of the following waves can propagate in a vacuum?

1. Radio Waves

2. Light Waves

3. X-rays

4. Ultrasonic Waves

Select the correct answer using the codes given below.

  • A 1,2 and 3
  • B 1,2,3 and 4
  • C 2,3 and 4
  • D 1 and 4

Question - 3

Radioactive substance used in dating geological object is

  • A C-12
  • B C-11
  • C C-14
  • D None of these

Question - 4

Nuclear fission is caused by the impact of 

  • A Proton
  • B Electron
  • C Neutron
  • D None of these

Question - 5

Match the radioisotopes with their applications from the alternates given

Radioisotope Application
A. Cobalt-60 1. Leukemia Therapy
B. Potassium-40 2. Thyroid Therapy
C. Iodine-131 3. Geological Dating
D. Phosphorus-32 4. Cancer Therapy
E. Carbon-14 5. Archaeological dating
  • A A B C D E 1 2 3 4 5
  • B A B C D E 5 4 3 2 1
  • C A B C D E 4 3 2 1 5
  • D A B C D E 4 3 2 5 1

Question - 6

Consider the following statements:

In a nuclear reactor, self-sustained chain reaction is possible, because

1. More neutrons are released in each of the fission reactions.

2. The neutrons immediately take part in the fission process.

3. The fast neutrons are slowed down by graphite.

4. Every neutron released in the fission reaction initiates further fission.

Which of the statements given above are correct?

  • A 1,2 and 3
  • B 1 and 3
  • C 2 and 4
  • D 2, 3 and 4

Question - 7

Which one of the following is correctly matched?

Column I Column II
A. Co-60 1. Circulation of blood
B. I-131 2. Treatment of tumors
C. P-32 3. Leukemia
D. Na-24 4. Treatment of goitre
  • A A 1
  • B B 2
  • C C 3
  • D D 4

Question - 8

Which one of the following has the highest frequency?

  • A Cosmic rays
  • B X-rays
  • C Radio waves
  • D Microwaves

Question - 9

Assertion (A): The Nuclear fusion reaction releases less energy than the fission reaction.

Reason (R): The Nuclear fusion reaction takes place in the sun and other stars.

  • A Both A and R are true and R is the correct explanation of A
  • B Both A and R are true but R is not the correct explanation of A
  • C A is true, but R is False
  • D A is false, but R is true.

Question - 10

Consider the following substances:

1. Heavy Water

2. Graphite

Which of the substances given above are used as a moderator in a nuclear reactor?

  • A Only 1
  • B Only 2
  • C Both 1 and 2
  • D Neither 1 nor 2