Long answer questions:
1. Describe the working of pinhole camera.
2. Explain lever and its types with the help of diagram
3. What is solar eclipse? Explain.
4. Explain screw & wheel and axle
5. Write three points of maintenance & care of machine.
6. Write a note on precautions in viewing solar eclipse.
don't write faltu answer
Answers
Answer:
1----Pinhole camera works on the principle that “Light travels in straight lines"Light from the objects enters the camera through the pinhole. It goes to the screen where it forms an inverted and small image. The image has the same colour as the object. If the pinhole is small, the image will be sharp and clear.
2-----There are three types of levers: first class, second class and third class. The difference between the three classes depends on where the force is, where the fulcrum is and where the load is. In a first class lever, the fulcrum is located between the input force and output force
3----A solar eclipse occurs when a portion of the Earth is engulfed in a shadow cast by the Moon which fully or partially blocks sunlight. This occurs when the Sun, Moon and Earth are aligned. Such alignment coincides with a new moon (syzygy) indicating the Moon is closest to the ecliptic plane.
4-----The simple machine called a wheel and axle refers to the assembly formed by two disks, or cylinders, of different diameters mounted so they rotate together around the same axis. The thin rod which needs to be turned is called the axle and the wider object fixed to the axle, on which we apply force is called the wheel.
5------Stay on top of large machinery operator training. ...
Add and test lubricants frequently. ...
Check for signs of wear. ...
Keep large machinery clean, and maintain a clean environment. ...
Have a maintenance and repair schedule, and keep good records.
6------DO NOT look directly at the sun.
DO NOT use ordinary sunglasses or home-made filters to view a Solar Eclipse or Surya Grahan.
ONLY use special-purpose solar filters-- eclipse glasses, handheld solar viewers-- to view the eclipse.