Draw the block diagram of a computer system. Briefly write about the functionality of each component.

Two blocks of masses $2 \mathrm{~kg}$ and $4 \mathrm{~kg}$ are connected by a light string passing over a light, smooth pulley clamped to the edge of a horizontal table. The $2 \mathrm{~kg}$ block is on the smooth horizontal table, and the other block is hanging vertically.

(i) Find the acceleration of the system if it is released from rest. (ii) Find the tension in the string.

Options: A. $6.54 m/s^{2}, 26 N$ B. $2.6 m/s^{2}, 6.54 N$ C. $6.54 m/s^{2}, 13 N$ D. $13 m/s^{2}, 26 N$

A block of mass $m$ is kept on a wedge of mass $M$ as shown in the figure, such that mass $m$ remains stationary with respect to the wedge. The magnitude of force $\mathrm{P}$ is:

A) $(M+m) g \tan \beta$

B) $g \tan \beta$

C) $m g \cos \beta$

D) $(M+m) g \operatorname{cosec} \beta$

A $300 \times \frac{2}{\sqrt{3}} \text{ N}$ B $300 \times \frac{\sqrt{3}}{2} \text{ N}$

C $300 \text{ N}$ D $150 \text{ N}$

A $30 \text{ kg}$ block is to be moved up an inclined plane at an angle $30^{\circ}$ to the horizontal with a velocity of $5 \text{ ms}^{-1}$. If the frictional force retarding the motion is $150 \text{ N}$ find the horizontal force required to move the block up the plane. $\left(g=10 \text{ ms}^{-2}\right)$

Two blocks of masses $5~\mathrm{kg}$ and $2~\mathrm{kg}$ are kept in contact with each other on a frictionless horizontal surface. If a force of $14~\mathrm{N}$ is applied on the larger block, what is the acceleration of the system? What is the contact force between the two blocks?

The correct answer is:

A $2~\mathrm{m/s^2}, 4~\mathrm{N}$

A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the center. The potted plant was then placed in sunlight for a few hours.

What aspect of photosynthesis was being tested? Why was the plant placed in the dark before beginning the experiment? During the starch test why was the leaf boiled in water and boiled in methylated spirit? Write a balanced chemical equation to represent the process of photosynthesis. Draw a neat diagram of a chloroplast and label its parts.