PRACTICE PAPER - 2

Draw a representative diagram of a D.C. motor. Label the Commutators.

Draw a representative diagram of a D.C. motor. Label the Wire brushes. What is the energy change involved in this case?

The following diagram is of the simplified version of an electron gun which is an integral part of a cathode ray tube. $\text{'}\mathrm{A}\text{'}$ is a filament and $\text{'}\mathrm{B}\text{'}$ is a metal cylinder.

Copy the diagram in your answer book. Draw a pair of plates ${\mathrm{P}}_1$ and ${\mathrm{P}}_2$ to apply electric field, a screen $\mathrm{S}$ and an enclosure.

The following diagram is of the simplified version of an electron gun which is an integral part of a cathode ray tube. $\text{'}\mathrm{A}\text{'}$ is a filament and $\text{'}\mathrm{B}\text{'}$ is a metal cylinder.

What are the functions of $\mathrm{A},\mathrm{B},{\mathrm{P}}_1$ and ${\mathbf{P}}_{\mathbf{2}}$

${}_{12}{}^{27}\mathrm{Mg}\stackrel{\mathrm{\beta }}{\to }\mathrm{Al}\stackrel{\mathrm{\gamma }}{\to }$

In the above nuclear reaction.

${}_{12}{}^{27}\mathrm{Mg}$ emits a $\beta$- particle and is transformed to aluminium. Write the mass number and the atomic number aluminium.

${}_{12}{}^{27}\mathrm{Mg}\stackrel{\mathrm{\beta }}{\to }\mathrm{Al}\stackrel{\mathrm{\gamma }}{\to }$

In the above nuclear reaction.

Aluminium emits $\gamma$-ray. What is the resulting nucleus?

Which radiation or particle from radioactivity produces maximum biological damage?

State three precautions that must be taken while handling a radioactive source.