XII Physics Atomic Nucleus Online test Mdcat-2024

Instructions for Chapter Atomic Nucleus Online Test Mdcat-2024:

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Test Details:

Subject: Physics
Class: 2nd year or 12
Chapter name: Atomic Nucleus
Test: MDCAT 2024
Book: Sindh Textbook
Total No. Of MCQS: 50
Time Allowed: 50 Minutes
Price : Free

112

Created on June 05, 2024 By

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XII Physics Atomic Nucleus Online Test Mdcat-2024

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NameEmailPhone Number

1 / 50

1. There is no change in A and Z of any radioactive element by the emission of:

a) Alpha rays

b) Beta rays

c) Gamma rays

d) X rays

2 / 50

2. ⁹⁰X³⁸ decays to ⁹⁰Y³⁹ by:

a) Emission of alpha particles

b) Emission of beta particles

c) Emission of 1 alpha and 2 beta particles

d) Absorption of electrons

3 / 50

3. The half-life of is 5 days, if we start with 50,000 atoms of this isotopes, the number of atoms left over after 10 days is:

a) 50000

b) 25000

c) 12500

d) 6000

4 / 50

4. What is the respective number of a and ẞ particles emitted in the following radioactive decay ⁹⁰X²⁰⁰ to ⁸⁰Y¹⁶⁸:

a) 6 and 8

b) 8 and 8

c) 6 and 6

d) 8 and 6

5 / 50

5. The decay constant of radium is 4.28 x 10⁻⁴ per year. Its half-life will be:

a) 2000 years

b) 63 years

c) 1240 years

d) 1620 years

6 / 50

6. A Radioactive Isotope ⁹²U²³⁸ decays consecutively ⁹²U²³⁴ to the particles emitted are:

a) One alpha and one beta

b) Two alpha and one beta

c) One alpha and two beta

d) Two alpha and two beta

7 / 50

7. In an alpha-decay:

a) The parent and daughter nuclei have same number of protons

b) The daughter nucleus has two protons less than parent nucleus

c) The daughter nucleus has one proton more than parent nucleus

d) The daughter nucleus has two neutrons more than parent nucleus

8 / 50

8. Gamma radiation is emitted due to:

a) De-excitation of atom

b) Excitation of atom

c) De-excitation of nucleus

d) Excitation of nucleus

9 / 50

9. A sample contains 16 gm of radioactive material, the half-life of which is two days. After 10 days, the amount of radioactive material left in the sample is:

a) 1/2 mg

b) 1/3 mg

c) 1/4 mg

d) 3/4 mg

10 / 50

10. The percentage of the original of radioactive material left after five half-lives is approximately:

a) 1 %

b) 3 %

c) 5 %

d) 7 %

11 / 50

11. In a radioactive sample, the number of nuclei decreases from 8000 to 1000 in 9 days, find the half-life:

a) 9 days

b) 6 days

c) 3 days

d) 1 day

12 / 50

12. At time (t=0) radioactive substance has 100 nuclei, in t =1 radioactive nuclei left are 90, find the nuclei left undecayed after t=2:

a) 85

b) 82

c) 78

d) 71

13 / 50

13. In a radioactive sample there are 10¹⁵ atoms and the activity is 6 x 10¹¹ Bq, find out the decay constant:

a) 6 x 10⁻⁴ sec⁻¹

b) 6 x 10⁻⁴ day⁻¹

c) 6 x 10⁴ sec⁻¹

d) 6.5 x 10⁻⁴ sec⁻¹

14 / 50

14. Activity is:

a) Negative

b) Positive

c) Zero

d) May be zero or positive

15 / 50

15. The half-life of radon is 3.8 days, the fourth of radon decay in:

a) 7.6 days

b) 15.2 days

c) 11.4 days

d) 14.4 days

16 / 50

16. The main source of solar energy is:

a) Fission reaction

b) Fusion reaction

c) Chemical reaction

d) Combustion reaction

17 / 50

17. Radioactivity is:

a) Random process

b) Irreversible process

c) Spontaneous process

d) All

18 / 50

18. In the disintegration series ²³⁸U⁹² --(alpha)--> X --(beta-)--> A (Y) Z, values of Z and A respectively:

a) 92, 236

b) 88, 230

c) 91, 234

d) 90, 234

19 / 50

19. When a radioactive nucleus emits a β-particle, the mass number of the atom?

a) Increases by one

b) Remains the same

c) Decreases by one

d) Decreases by four

20 / 50

20. The decay constant A of a radioactive sample:

a) Decreases as the age of atoms increases

b) Increases as the age of atoms increases

c) Depends on nature of the element

d) All are correct

21 / 50

21. Half-life of a radioactive active substance depends on:

a) Temperature

b) Pressure

c) Nature of substance

d) Electric and magnetic field

22 / 50

22. The half-life of radium is about 1600 years. If 100 g radium existing now, 25 g will remain un-decayed after:

a) 4800 years

b) 6400 years

c) 1600 years

d) 3200 years

23 / 50

23. The half-life of radium is 1600 years. In how many years shall the earth lose all its radium due to radioactive decay?

a) 1590 x 10⁶ years

b) 1590 x 10²⁴ years

c) 1590 x 10¹² years

d) Never

24 / 50

24. The half-life of a certain element is 7 days at S.T.P. If the temperature is doubled and pressure is reduced to half then half-life of the same element will be:

a) 1.75 days

b) 3.5 days

c) 7 days

d) 8.5 days

25 / 50

25. After Alpha-emission from ²²⁶Ra⁸⁸, the daughter nucleus will be:

a) ²²⁶Ra⁸⁶

b) ²²⁴Ra⁸⁶

c) ²²⁶Ru⁸⁶

d) ²²²Ru⁸⁶

26 / 50

26. After B-emission from neutron, which particle is found?

a) Proton

b) Neutron

c) Electron

d) Proton and electron

27 / 50

27. When a radioactive nucleus emits an a-particle, the N/Z ratio?

a) Increases

b) Remains same

c) Decreases

d) Any of these

28 / 50

28. If the half-life of a substance is 3.5 days and its quantity is 16.0 g. Then the quantity left after 14 days will be:

a) 0.25 g

b) 1.0 g

c) 0.5 g

d) 2.0 g

29 / 50

29. The SI unit(s) of activity is (are):

a) Becquerel

b) Rutherford

c) Curie

d) All of these

30 / 50

30. If the decay constant of an element is smaller then:

a) More of its atoms will decay in a particular interval

b) Less of its atoms will decay in a particular interval

c) Its infinite atoms will decay in a particular interval

d) Both A and B are possible depending upon the half-life of element

31 / 50

31. The sample of radioactive element decayed after 5-half-lives:

a) N⁰/32

b) (N⁰/31) - (N⁰/32)

c) 31/32 N⁰

d) (N⁰/32 )- (N⁰/31)

32 / 50

32. Beta rays emitted by a radioactive material are:

a) Electromagnetic radiations

b) Electrons orbiting around the nucleus

c) Negatively charged particles emitted by the nucleus

d) All of these

33 / 50

33. The SI unit of decay constant is:

a) sec

b) 1/sec

c) sec²

d) 1/sec²

34 / 50

34. After 4 hours, 1/16th of atoms of a radioactive sample remains undecayed, the half-life of the radioactive element is:

a) 2 hours

b) 3 hours

c) 1 hour

d) 30 minutes

35 / 50

35. The rate of decay of radioactive substance with time?

a) Increases linearly

b) Increases exponentially

c) Decreases linearly

d) Decreases exponentially

36 / 50

36. Which one of the following radiations possesses maximum penetrating power?

a) α-rays

b) γ-ray

c) β-rays

d) All have equal penetrating power

37 / 50

37. After α-decay, the parent and daughter nuclei are called:

a) Isomers

b) Isobars

c) Isotones

d) Isodiapheres

38 / 50

38. The emission of β-particle results in:

a) Isomers

b) Isobars

c) Isotones

d) Isodiapheres

39 / 50

39. The number of atoms decayed in four half-lives are:

a) N/8

b) N/16

c) 7N/8

d) 15N/16

40 / 50

40. What is the half-life of a radioactive substance?

a) The time it takes for all the atoms in a sample to decay

b) The time it takes for half of the radioactive atoms in a sample to decay

c) The time it takes for a radioactive atom to lose all of its energy

d) The time it takes for the mass of the sample to halve

41 / 50

41. Which type of radioactive decay involves the emission of an electron from the nucleus?

a) Alpha decay

b) Beta decay

c) Gamma decay

d) Neutron decay

42 / 50

42. In the process of nuclear fission, which of the following occurs:

a) A nucleus absorbs a neutron and splits into smaller nuclei, releasing energy

b) Two smaller nuclei combine to form a larger nucleus, releasing energy

c) An electron is emitted from the nucleus

d) A nucleus emits gamma radiation without changing its structure

43 / 50

43. Particle which can be added to atomic nucleus without changing their chemical properties:

a) Electrons

b) Protons

c) Neutrons

d) All

44 / 50

44. Charge on alpha particles is how many times to protons:

a) 2 times

b) 3 times

c) 4 times

d) 10 times

45 / 50

45.

a) 1

b) 2

c) 3

d) 4

46 / 50

46. The Equation _ZX^A→_z+1Y^A+ _-1e⁰+ῡ represents :

a) β-decay

b) γ-decay

c) α-decay

d) Proton decay

47 / 50

47. What is the graph b/w activity and time?

Screenshot 2024 06 06 004159

a) a

b) b

c) c

d) d

e) e

48 / 50

48.

_ZX^A→_z+1Y^A → _z-1K^A-4→_z-1K^A-4

Radioactive radiations are emitted in the sequence

a) α,β,γ

b) α,γ,β

c) γ,β,α

d) β,α,γ

49 / 50

49. An Alpha-emission is always accompanied by:

a) β-emission

b) γ-emission

c) Both "A" and "B"

d) Neutron emission

50 / 50

50. Isotope of uranium used as nuclear reactor fuel is:

a) U ²³⁸ (99.3%)

b) U ²³⁵ (0.7%)

c) U ²³⁴

d) U ²³⁹

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