MDCAT XII Nuclear Physics Online Test-2

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Created on May 27, 2025 By

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MDCAT XII Physics Nuclear Physics Online Test-2

Test Details

Subject: Physics
Class: 2nd year / XII
Chapter Name: Nuclear Physics
Test: 2
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

NameEmailPhone Number

1 / 50

1. Radiation refers to transfer of

a) Wave

b) Energy

c) Momentum

d) All of these

2 / 50

2. If half life of a radioactive material 3 days,then decay constant is

a) 0.1

b) 0.2

c) 0.3

d) 0.4

3 / 50

3. Which of the following is correct about half life of element?

a) It is half time required for substance to decay half

b) It is half time required for substance to decay completely

c) It is time required for substance to decay to half

d) It is time required for substance to decay half and then completely

4 / 50

4. In gamma decay

a) radon is converted to radium

b) radium is converted to radon

c) radon is conveted to krypton

d) none of these

5 / 50

5. 30 gram of a radiooactive substance having , half life of 2 days,how much substance will be present after 10days.

a) 15g

b) 7.5g

c) 3.75g

d) 1.8g

6 / 50

6. Change in atomic number is due to

a) Alpha decay

b) Electron decay

c) Positron decay

d) All of these

7 / 50

7. Why is half-life counted instead of full time to decay a substance?

a) Because it is easy to measure half life

b) Because full time to decay substance is same for all radioactive substances

c) Because radioactive substances never decay Completely

d) Cant be determinedCant be determined

8 / 50

8. Beta radiation in beta radiation is an electron that comes from

a) Inner shell of element

b) Outer shell of element

c) Nucleus of element

d) From outer source

9 / 50

9. As the substance decays and its quantity decreases,its half life

a) Will deacrese

b) Will increase

c) Will remain same

d) Cant be determined

10 / 50

10. Half life of a radioactivr substance depends on

a) Nature of element

b) Temperature of element

c) Amount of undecayed element

d) Amount of decayet element

e) Amound of decayed element All of these

11 / 50

11. What is main difference between spontaneous and induced radioactivity?

a) Temperature

b) Pressure nature of material

c) Nature of radioactive substance

d) Both a and b

12 / 50

12. When a beta-positive particle is emitted, what happens?

a) A proton change into neutron

b) A neutron is changed into proton

c) An alpha particle changed to neutron

d) Noneof these

13 / 50

13. An alpha particle changed to neutron

a) Mass defect

b) Binding energy

c) Both a and b

d) None of these

14 / 50

14. Half life of a substance is 10year,how much it required to decay its 10grams completely

a) 10 years

b) 50 years

c) 100 years

d) None of these

15 / 50

15. Which of the following is correct arrangement according to ascending order of penteration power of particles

a) Alpha,beta,gamma

b) Gamma,beta,alpha

c) Gamma,alpha,beta

d) Cant be determined

16 / 50

16. Number of disintegrations per unit time called

a) disintegration constant

b) disintegration constant radioactivity

c) radioactivity

d) activity

e) relative activity

17 / 50

17. In alpha decay:

a) A remain same,z changes by 2

b) A changes by 2,z changes by 2

c) A changes by 4,z changes by 2

d) A changes by 2,z changes by 4

18 / 50

18. Bombarding an stable material with neutron is an example of

a) Natural radioactivity

b) Spotaneuous radioactivity

c) Induced radioactivity

d) Both a and b

19 / 50

19. Atomic bomb is an example of

a) Controled chain reaction

b) uncontrolled chain reaction

c) Controled or uncontrolled chain reaction depending on type of atomic bomb

d) Cant be determined

20 / 50

20. Half life is:

a) Directly propotional to decay constant

b) Inversely propotional to decay constant

c) Expotentionally propotional to decay constant

d) Independent of decay constant

21 / 50

21. Energy released per unit mass in fission reaction is

a) Greater than fusion reaction

b) Lesser than fusion reaction

c) Equal to fusion reaction

d) Cant be determined

22 / 50

22. Larger the quantity of radioactive material_____

a) Slowly the decay occur

b) fastly the decay occur

c) decay is independent of quantity of material

d) cant be deternined

23 / 50

23. Beta +ve decay is the same as____

a) Beta –ve decay

b) Proton decay

c) Electron decay

d) None of these

24 / 50

24. In which of the two following processes nuclear changes are same

a) Proton and positron decay

b) Beta +VE And beta -ve decay

c) Electron capture and beta +ve capture

d) Electron capture and beta –VE DECAY

25 / 50

25. Small decay constant means atom is decaying

a) Expotentionally

b) Slowly

c) Fastly

d) Cant be determined

26 / 50

26. Mass defect refers to difference between total mass and actual mass of

a) Electron

b) Proton

c) Neutron

d) All of these

27 / 50

27. In beta decay____

a) A remain same

b) Z remain same

c) Both A and Z remain same

d) Cant be determined

28 / 50

28. If the life of a substance is 20 days,a fter how many days its Quantity remain at 6.25%

a) 20days

b) 40days

c) 60days

d) None of these

29 / 50

29. Muzamil places a radioactive element in a box and half life of substance is 12 hours,after 2days,what will he see in the box

a) Substance is in same quantity

b) Substance has decay to half of its initial value

c) Substance has decay to one fourth of its initial value

d) Substance has decay to one sixteenth of its initial value

30 / 50

30. The peaks of the binding energy per nucleon graph shows nuclei are

a) Unstable

b) Less stable

c) More stable

d) Cant be determined

31 / 50

31. The binding energy per nucleon is smallest for:

A. ₁H²

B. ₄Be⁶

C. ₆C¹²

D. ₈O¹⁶

a) A

b) B

c) C

d) D

32 / 50

32. Which of the following are spontaneous

a) Natural radioactivity

b) Artificial radioactivity

c) Both a and b

d) Cant be determined

33 / 50

33. A process in which the nucleus splits into two light nuclei by bombarding a slow neutron called

a) Nuclear splits

b) Nuclear fusion

c) Nuclear fission

d) radioativity

35 / 50

35. Sun produces energy through

a) Nuclear fission reaction

b) Nuclear fusion reaction

c) Nuclear fission and fusion reaction

d) Cant be determined

36 / 50

36. What is the medical use of nuclear radiation?

a) X ray imaging

b) Ct scans

c) PET scan

d) All of these

37 / 50

37. Materials which absorb neutrons are

a) Moderator

b) Control rods

c) Coolants

d) All of these

39 / 50

39. Binding energy is energy required to remove---------from nucleaus

a) Protons

b) Neutron

c) Electron proton pair

d) Nucleons

40 / 50

40. What is mass number of positron

a) 0

b) 1

c) -1

d) -2

41 / 50

41. What is amount of substance decay after 3 years if half life of substance is 1year

a) 25%

b) 75%

c) 93.75%

d) 87.5%

42 / 50

42. Positron is

a) Same as proton

b) Antiparticle of proton

c) Same as electron

d) Anti particle of electron

43 / 50

43. Which of the following is not possible?

a) Alpha decay make radioactive element electrically negative

b) Beta decay make radioactive element electrically positive

c) Half life is independent of quantity of material

d) The radioactive material with half life 20days will completely disappear after 20 days

44 / 50

44. When a beta radiation is emmited____

a) A proton is decayed

b) A neutron is decayed

c) An electron is decayed

d) Whole nucleaus is decayed

45 / 50

45. Dosimetry is science of measuring?

a) External radions

b) Internal radiations

c) Radiation dose

d) All of these

46 / 50

46. When a positron is emitted from a substance, its mass number is ?

a) Increase by 1

b) Decreases by 1

c) Remain same

d) Cant be determined

47 / 50

47. Decay constant also called_____

a) Radioactivity constant

b) Half life constant

c) Both a and b

d) None of these

48 / 50

48. When a nuclear reaction Is exothermic Q is taken as

a) Positive

b) Negative

c) Either positive or negative depending on nature o decaying material

d) Cant be determined

49 / 50

49. What is function of moderator in a nuclear reaction?

a) Absorb neutron

b) Slows down neutron

c) Absorb heat

d) All of these

50 / 50

50. Which fusion reaction takes place in sun

a) Proton proton cycle

b) Carbon proton cycle

c) Carbon nitrogen cycle

d) Both a and b

e) Both b and c

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MDCAT XII Nuclear Physics Online Test-2

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