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# QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries)

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## 15 Questions MCQ Test | QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries)

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QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 1

### The graph between wave number (ν¯) and angular frequency (w) is [AIIMS 2002]

Detailed Solution for QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 1
• ω=2πν=2πc/λ=2πcν¯=

• ω∝ν¯

.

QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 2

### Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct [Orissa JEE 2002]

Detailed Solution for QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 2

with increase in mass no. stability decreases

QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 3

### Binding energy per nucleon verses mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei indicated on the curve. The process that would release energy is [IIT-JEE 1999]

Detailed Solution for QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 3
•      Energy is released in a process when total Binding energy (B.E.) of the nucleus is increased or we can say when total B.E. of products is more than the reactants. By calculation we can see that only in case of option (c), this happens. Given

W→2Y

B.E. of reactants = 120 ´ 75 = 900 MeV and B.E. of products =

2×(60×85)=1020MeV

i.e. B.E. of products > B.E. of reactants.
QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 4

The graph between the instantaneous concentration (N) of a radioactive element and time (t) is

QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 5

The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half-life of material and the total counts (approximately) in the first half life period, respectively are [CPMT 1986]

Detailed Solution for QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 5
•     Read time for 50 count rate, it gives half-life period of    3 hrs, one small square gives 600 counts (10 × 60). The number of small squares between graph and time axis are approx 24 Hence count rate =

24×600=14400

*Answer can only contain numeric values
QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 6

A radioactive material decays b simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth of the material remains is ?

*Answer can only contain numeric values
QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 7

A nucleus at rest breaks into two nuclear parts which have their velocities ratio equal to 8: 1. The ratio of their nuclear radii is .....

Detailed Solution for QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 7

1.conserve momentum

2.density is same

*Answer can only contain numeric values
QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 8

Ten grams of 57Co kept in an open container beta-decays with a half-life of 270 days. The weight of the material inside the container after 540 days will be nearly (in grams)?

*Answer can only contain numeric values
QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 9

the half-life of 24Na is 15.0 h. How long does it take for 80 percent of a sample of this nuclide to decay? [In 5=1.6](in h)

*Answer can only contain numeric values
QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 10

Tritium (31H) has a half-life of 12.5y against beta decay. What fraction of a sample of tritium will remain undecayed after 25y?

Detailed Solution for QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 10

N=N0(1/2)n,where n=no. of half lifes

QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 11

Assertion : Neutrons penetrate matter more readily as compared to protons. Reason : Neutrons are slightly more massive than protons. [AIIMS 2003]

Detailed Solution for QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 11

Neutron is about 0.1 more massive than proton. But the unique thing about the neutron is that while it is heavy, it has no charge (it is neutral). This lack of charge gives it the ability to penetrate matter without interacting as quickly as the beta particles or alpha particles.

QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 12

Assertion : Radioactive nuclei emit β−1 particles. Reason : Electrons exist inside the nucleus. [AIIMS 2003]

Detailed Solution for QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 12

Nuclear stability depends upon the ratio of neutron to proton. If the n/p ratio is more than the critical value, then a neutron gets converted into a proton forming a β− particle in the process. n→p+e−             The β− particle (e−) is emitted from the nucleus in some radioactive transformation. So electrons do not exist in the nucleus but they result in some nuclear transformation.

QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 13

Assertion : Density of all the nuclei is same. Reason : Radius of nucleus is directly proportional to the cube root of mass number. [AIIMS 2000]

QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 14

Assertion : Isobars are the element having same mass number but different atomic number. Reason : Neutrons and protons are present inside nucleus. [AIIMS 1997]

QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 15

Assertion : The ionising power of b-particle is less compared to a-particles but their penetrating power is more. Reason : The mass of b-particle is less than the mass of a-particle.

Detailed Solution for QUIZ 2:Radioactivity And Nuclear Physics(#freetestseries) - Question 15

b-particles, being emitted with very high speed compared to a-particles, pass very little time near the atoms of the medium. So the probability of the atoms being ionised is comparatively less. But due to this reason, their loss of energy is very slow and they can penetrate the medium through a sufficient depth.

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