PART - 1 CH - 4 Carbon and Its Compounds — Science STD 10 — Question

Which signals will get disrupted in case of a spinal cord injury?

We saw in this chapter that there are four main stakeholders when it comes to forests and wildlife. Which among these should have the authority to decide the management of forest produce? Why do you think so?

Prashant was going to his office in his car. While driving his car, Prashant saw a man behind him on a motorcycle through his rear-view mirror. A woman was also sitting behind the man on the motercycle. Through his rear-view mirror, Prashant noticed that the saree of the woman was almost touching the spokes of the motorcycle wheel. He signalled the motorcyclist to stop and alerted the woman. She tied her saree properly and thanked Prashant for the alert.
(1) What type of mirror is used as a rear- view mirroг?
(2) State two characteristics of the image formed by such a mirror.
(3) What values are displayed by Prashant in this incident?

Why does a compass needle get deflected when brought near a bar magnet?

An object, 4.0 cm in size, is placed at 25.0 cm in front of a concave mirror of focal length 15.0 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and the size of the image.

Define :
Stimulus

Distinguish between : Ionic compounds and Covalent compounds

Why is diffusion insufficient to meet the oxygen requirement of multicellular organisms like humans?

A solution of a substance 'X' is used for whitewashing.
(1) Name the substance 'X' and write its formula.
(2) Write the reaction of the substance 'X' named in (1) above with water.