PART - 3 CH - 11 Electricity — Science STD 10 — Question

Give structural formulae of the compounds using their IUPAC names:
Ethene

A metal compound ‘A’ reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction, if one of the compounds formed is calcium chloride.

What is the far point of the human eye?

Which of the following statements is correct?
(a) one volt is one joule per ampere.
(b) one volt is one joule per coulomb.

How does the potential difference divide itself in a series combination of resistors?

Identify me: I am a disc like specialised tissue developed after implantation of embryo in a uterine wall.

State the elements used as catalyst in hydrogenation reaction.

Why are forests called as biodiversity hot spots?

Why is much less heat generated in long electric cables than in the filament of an electric bulb?

Sudha finds that a sharp image of the windowpane of her science laboratory is formed at 15 cm from the lens. She now tries to focus the building visible to her outside the window instead of the windowpane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building? What is the approximate focal length of this lens?