1
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
This question contains Statement- 1 and Statement- 2. Of the four choices given after the statements, choose the one that best describes the two statements:
Statement- 1:
Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion and

Statement- 2:
For heavy nuclei, binding energy per nucleon increases with increasing $$Z$$ while for light nuclei it decreases with increasing $$Z.$$

A
Statement - $$1$$ is false, Statement - $$2$$ is true
B
Statement - $$1$$ is true, Statement - $$2$$ is true; Statement - $$2$$ is a correct explanation for Statement - $$1$$
C
Statement - $$1$$ is true, Statement - $$2$$ is true; Statement - $$2$$ is not a correct explanation for Statement - $$1$$
D
Statement - $$1$$ is true, Statement - $$2$$ is false
2
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A working transistor with its three legs marked $$P,Q$$ and $$R$$ is tested using a multi-meter. No conduction is found between $$P$$ and $$Q$$. By connecting the common (negative) terminal of the multi-meter to $$R$$ and the other (positive) terminal to $$P$$ or $$Q,$$ some resistance is seen on the multi-meter. Which of the following is true for the transistor?
A
It is an $$npn$$ transistor with $$R$$ as base
B
It is an $$pnp$$ transistor with $$R$$ as collector
C
It is an $$pnp$$ transistor with $$R$$ as emitter
D
It is an $$npn$$ transistor with $$R$$ as collector
3
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Suppose an electron is attracted towards the origin by a force $${k \over r}$$ where $$'k'$$ is a constant and $$'r'$$ is the distance of the electron from the origin. By applying Bohr model to this system, the radius of the $${n^{th}}$$ orbital of the electron is found to be $$'{r_n}'$$ and the kinetic energy of the electron to be $$'{T_n}'.$$

Then which of the following is true?

A
$${T_n} \propto {1 \over {{n^2}}},{r_n} \propto {n^2}$$
B
$${T_n}$$ independent of $$n,{r_n} \propto n$$
C
$${T_n} \propto {1 \over n},{r_n} \propto n$$
D
$${T_n} \propto {1 \over n},{r_n} \propto {n^2}$$
4
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure). AIEEE 2008 Physics - Dual Nature of Radiation Question 143 English

Electrons accelerated by potential $$V$$ are diffracted from a crystal. If $$d = 1\mathop A\limits^ \circ $$ and $$i = {30^ \circ },\,\,\,V$$ should be about
$$\left( {h = 6.6 \times {{10}^{ - 34}}Js,{m_e} = 9.1 \times {{10}^{ - 31}}kg,\,e = 1.6 \times {{10}^{ - 19}}C} \right)$$

A
$$2000$$ $$V$$
B
$$50$$ $$V$$
C
$$500$$ $$V$$
D
$$1000$$ $$V$$
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