EM 10th Science - Unit

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EM 10th Science - Unit - 6

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Choose the correct answer

1. Man-made radioactivity is also known as_____________.

1 point

Induced radioactivity

Spontaneous radioactivity

Artificial radioactivity

a & c

Clear selection

2. Unit of radioactivity is _____________

1 point

roentgen

curie

becquerel

all the above

Clear selection

3. Artificial radioactivity was discovered by____________.

1 point

Becquerel

Irene Curie

Roentgen

Neils Bohr

Clear selection

4. In which of the following, no change in mass number of the daughter nuclei takes place

i) α decay ii) β decay iii) γ decay iv) neutron decay

1 point

(i) is correct

(ii) and (iii) are correct

(i) & ( iv) are correct

(ii) & (iv) are correct

Clear selection

5. ____________ isotope is used for the treatment of cancer.

1 point

Radio Iodine

Radio Cobalt

Radio Carbon

Radio Nickel

Clear selection

6. Gamma radiations are dangerous because

1 point

it affects eyes & bones

it affects tissues

it produces genetic disorder

it produces enormous amount of heat

Clear selection

7. _____________ aprons are used to protect us from gamma radiations.

1 point

Lead oxide

Iron

Lead

Aluminium

Clear selection

8. Which of the following statements is/are correct?

i) α particles are photons ii) Penetrating power of γ radiation is very low

iii) Ionization power is maximum for α ray iv) Penetrating power of γ radiation is very high

1 point

(i) & (ii) are correct

(ii) & (iii) are correct

(iv) only correct

(iii) & (iv) are correct

Clear selection

9. Proton - Proton chain reaction is an example of__________________.

1 point

Nuclear fission

α - decay

Nuclear fusion

β - decay

Clear selection

11. Kamini reactor is located at __________.

1 point

Kalpakkam

Koodankulam

Mumbai

Rajasthan

Clear selection

12. Which of the following is/are correct?

i) Chain reaction takes place in a nuclear reactor and an atomic bomb.

ii) The chain reaction in a nuclear reactor is controlled.

iii) The chain reaction in a nuclear reactor is not controlled.

iv) No chain reaction takes place in an atom bomb.

1 point

(i) only correct

(i) & (ii) are correct

(iv) only correct

(iii) & (iv) are correct

Clear selection

Fill in the blanks.

True or False

1. Plutonium -239 is a fissionable material.

1 point

True

False

Clear selection

2. Elements having atomic number greater than 83 can undergo nuclear fusion.

1 point

True

False

Clear selection

3. Nuclear fusion is more dangerous than nuclear fission.

1 point

True

False

Clear selection

4. Natural uranium U-238 is the core fuel used in a nuclear reactor.

1 point

True

False

Clear selection

5. If a moderator is not present, then a nuclear reactor will behave as an atom bomb.

1 point

True

False

Clear selection

6. During one nuclear fission on an average, 2 to 3 neutrons are produced.

1 point

True

False

Clear selection

7. Einstein’s theory of mass energy equivalence is used in nuclear fission and fusion.

1 point

True

False

Clear selection

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