Posts

Showing posts from November, 2022

Std.7 sst ch.1 question answer

2 . If the Himalayas did not exist     If the Himalayas did not exist, India would be very different. The cold winds from Central Asia would enter India freely, making the climate much colder and drier. Many rivers like the Ganga, Yamuna, and Brahmaputra might not exist because these rivers originate from the Himalayan glaciers. Without the Himalayas, there would be less rainfall, fewer forests, and farming would become difficult in many regions. The northern plains might even look like deserts. The Himalayas also protect India from strong winds and help in bringing monsoon rains, so life in India would be much harder without them. 3. Why is India called a ‘mini-continent’? India is called a “mini-continent” because it has great diversity in physical features, climate, culture, languages, and natural resources, just like a continent. It has mountains in the north, deserts in the west, plains in the center, plateaus in the south, and coastal regions on both sides. Different par...

CAMERA

Image
  CAMERA The first permanent photograph of a camera image was made in 1825 by Joseph Nicéphore Niépce using a sliding wooden box camera made by Charles and Vincent Chevalier in Paris .  A  camera  is an  optical  instrument that captures a visual  image . At a basic level, cameras consist of sealed boxes, with a small hole  that allows  light  through to capture an image on a light-sensitive surface . Cameras have various mechanisms to control how the light falls onto the light-sensitive surface.  Lenses  focus the light entering the camera. The aperture can be narrowed or widened. A  shutter  mechanism determines the amount of time the  photosensitive  surface is exposed to light. History of the camera The forerunner to the photographic camera was the  camera obscura . Camera obscura is the natural optical phenomenon that occurs when an image of a scene at the other side of a screen (or for instance a ...