# PPSC Lecturer of Physics Online Test 31 Past Papers

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 Test Instructions:- Test Name Lecturer PhysicsÂ Subject Physics Test 31 Test Type MCQs Total Questions 25 Total Time 20 Minutes Total Marks 100
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You have 20 minutes to pass to the quiz.

PPSC Lecturer of Physics Test 31

1 / 25

A radium atom, 226Ra (Z = 86) emits an alpha particle. The number of protons in the resulting atom is:

2 / 25

Some alpha emitters have longer half-lives than others because:

3 / 25

A radioactive atom X emits a Î²âˆ’ particle. The resulting atom:

4 / 25

A large collection of nuclei are undergoing alpha decay. The rate of decay at any instant is proportional to:

5 / 25

At the end of 14 min, 1/16 of a sample of radioactive polonium remains. The corresponding half-life is:

6 / 25

A nucleus with mass number A and atomic number Z undergoes Î² âˆ’ decay. The mass number and atomic number, respectively, of the daughter nucleus are:

7 / 25

The half-life of radium is about 1600 years. If a rock initially contains 1 g of radium, the amount left after 6400 years will be about:

8 / 25

The relation between the disintegration constant Î» and the half-life T of a radioactive substance is:

9 / 25

Of the three common types of radiation (alpha, beta, gamma) from radioactive sources, electric charge is carried by:

10 / 25

The half-life of a radioactive substance is:

11 / 25

An alpha particle is:

12 / 25

Starting with a sample of pure 66Cu, 7/8 of it decays into Zn in 15 minutes. The corresponding half-life is:

13 / 25

Stable nuclei generally:

14 / 25

A nucleus with mass number A and atomic number Z emits an alpha particle. The mass number and atomic number, respectively, of the daughter nucleus are:

15 / 25

The energies of electrons emitted in Î²âˆ’ decays have a continuous spectrum because:

16 / 25

65Cu can be turned into 66Cu, with no accompanying product except a gamma, if bombarded with:

17 / 25

The half-life of a given nuclear disintegration A â†’ B:

18 / 25

Radioactive 90Sr has a half-life of 30 years. What percent of a sample of 90Sr will remain after 60 years?

19 / 25

210Bi (an isotope of bismuth) has a half-life of 5.0 days. The time for three-quarters of a sample of 210Bi to decay is:

20 / 25

The half-life of a radioactive isotope is 140 days. In how many days does the decay rate of a sample of this isotope decrease to one-fourth of its initial decay rate?

21 / 25

A nucleus with mass number A and atomic number Z undergoes Î²+ decay. The mass number and atomic number, respectively, of the daughter nucleus are:

22 / 25

The greatest binding energy per nucleon occurs for nuclides with masses near that of:

23 / 25

In addition to the daughter nucleus and an electron or positron, the products of a beta decay include:

24 / 25

Beta particles from various radioactive sources all have:

25 / 25

In an alpha decay the disintegration energy appears chiefly as: