Nuclear Stability

Q. Nuclear force is a short range force.

1. True

2. False

Q.

Which is more radioactive U 235 or U 238?

Q. Two protons are kept at a separation of 10 nm. Let $F_n$ and $F_e$ be the nuclear force and the electromagnetic force between them.

1. 
2. 
3. 
4. differ only slightly

Q.

A nucleus of mass $M+△m$ is at rest and decays into two daughter nuclei of equal mass $\frac{M}{2}$ each. Speed of light is $c$.
The binding energy per nucleon for the parent nucleus is $E_1$ and that for the daughter nuclei is $E_2$. Then

1. $E_2=E_1$

2. $E_1>E_2$

3. $E_2>E_1$

4. $E_1=2E_2$

Q. In the periodic table, almost every isotope of the elements after the element , are radioactive in nature.

1. tin
2. lead
3. uranium

Q. Gamma rays have high penetrating power.

1. False
2. True

Q.

Why does gamma radiation actually occur

Q. The mass number of the most radioactive uranium isotope is

1. 238
2. 235
3. 210
4. 226

Q. When exposed to electric field, particles are deviated towards the positive electrode or plate.

1. $\alpha$
2. $\beta$
3. $\gamma$

Q. Which of the following facts are inferred from the given N vs Z graph?

1. For lighter stable nuclei
2. For lighter stable nuclei
3. For heavier stable nuclei
4. For heavier stable nuclei

Q. A nucleus of mass $M+△m$ is at rest and decays into two daughter nuclei of equal mass $\frac{M}{2}$ each. Speed of light is $c$.
The binding energy per nucleon for the parent nucleus is $E_1$ and that for the daughter nuclei is $E_2$. Then

1. $E_2=2E_1$
2. $E_1>E_2$
3. $E_2>E_1$
4. $E_1=2E_2$

Q.

Uranium - 235 is the heaviest naturally occurring isotope.

1. True
2. False

Q. The mass defect in a nucleus is because of:

1. Nucleons
2. Electrons
3. Neither
4. Both

Q.

____ rays are negatively charged.

Q.

Canal rays obtained from different gases have different mass and charge.Explain.

Q. The uranium nucleus ${}_{92}{\text{U}}^{238}$ emits an $\alpha$ -particle and resulting nucleus emits one $\beta$ -particle. The atomic number and mass number of the final nucleus will be respectively

1. $90,234$
2. $92,234$
3. $91,234$
4. $91,238$

Q. A pairing of nucleons of opposite spins is favored inside a nucleus because:

1. According to Pauli's exclusion principle no two nucleons can be in the same state of spin
2. According to Pauli's exclusion principle no two nucleons can be in the same quantum state
3. The nuclear force between two nucleons of same spin is repulsive
4. All of the above

Q. a charged particle moves in a gravity free space without change in velocity. which of the following is not possible in that space? (1) E=0 , B=0 (2) E, B is not equal to 0 (3) E=0, B is not equal to 0 (4) E is not equal to zero, B=

Q.

Match the following for a pair of protons:
1. Electrostatic Force I. AttractiveStrong
2. Nuclear Force II. Repulsive

1. 1-I, 2-II

2. 1-I, 2-I
3. 1-II, 2-II

4. 1-II, 2-I

Q. Which of the following is a short range force?

1. Electrostatic Force
2. Neither of these
3. Both of these
4. Nuclear Force

Q. Which of the following is followed while handling the radioactive materials?

1. Wearing protective clothing.
2. Keeping as far away as is practicable - for example, by using tongskeeping
3. Keeping radioactive materials in lead-lined containers,
4. All of the above.

Q. A nucleus of mass $M+△m$ is at rest and decays into two daughter nuclei of equal mass $\frac{M}{2}$ each. Speed of light is $c$.
The binding energy per nucleon for the parent nucleus is $E_1$ and that for the daughter nuclei is $E_2$. Then
[AIEEE-2010]

1. $E_2=2E_1$
2. $E_2>E_1$
3. $E_1=2E_2$
4. $E_1>E_2$

Q.

The mass defect in a nucleus is because of?

1. Electrons

2. Both

3. Neither

4. Nucleons

Q.

$M_n$ and $M_p$ represent mass of neutron and proton respectively. If an element having nuclear mass M has N - neutrons and Z - protons, then the correct relation will be

1. $M<[N{M}_n+Z{M}_p]$

2. $M=[N{M}_n+Z{M}_p]$

3. $M>[N{M}_n+Z{M}_p]$

4. $M=NZ[M_n+M_p]$

Q.

What is the name of the thing which is even smaller than electrons and protons?

Q. During an artificial transmutation the nucleus emits

1. $\beta$ -particles
2. $\alpha$ -particles
3. always neutrons
4. may emit protons or neutrons

Q. Why dont electrons fall into the nucleus?

Q. Which of the following is a short range force?

1. Both of these
2. Nuclear Force
3. Electrostatic Force
4. Neither of these

Q. How many neutrons are available in total in all the three isotopes of carbon?

1. 18
2. 21
3. 24
4. 39

Q. ntin an atom we say that mass of an atom is only due to proton and electron and not by electron.n ntbut when we add or remove electron in an atom the mass of atom changes.n ntexplain this statement.n