Step 1: Analyzing the scene composition.
- The examination hall should feature rows of desks and chairs.
- Students should be depicted seated and engaged in writing their exams.
- An invigilator should be present, supervising the students.
Step 2: Creating depth and perspective.
- Utilize linear perspective to add depth to the hall.
- Draw desks in rows, reducing in size as they recede into the background to maintain perspective.
Step 3: Incorporating environmental details.
- Add elements such as windows, doors, ceiling fans, and a wall clock to enhance realism.
- Illustrate students in varied postures, including writing, thinking, or reviewing their answer sheets.
Step 4: Enhancing realism.
- Apply shading techniques to add volume to the desks, chairs, and architectural elements.
- Maintain accurate proportions for students and objects to ensure a realistic composition.
Figure 1 shows the configuration of main scale and Vernier scale before measurement. Fig. 2 shows the configuration corresponding to the measurement of diameter $ D $ of a tube. The measured value of $ D $ is:
The center of a disk of radius $ r $ and mass $ m $ is attached to a spring of spring constant $ k $, inside a ring of radius $ R>r $ as shown in the figure. The other end of the spring is attached on the periphery of the ring. Both the ring and the disk are in the same vertical plane. The disk can only roll along the inside periphery of the ring, without slipping. The spring can only be stretched or compressed along the periphery of the ring, following Hooke’s law. In equilibrium, the disk is at the bottom of the ring. Assuming small displacement of the disc, the time period of oscillation of center of mass of the disk is written as $ T = \frac{2\pi}{\omega} $. The correct expression for $ \omega $ is ( $ g $ is the acceleration due to gravity):