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Home/ncert solutions/Page 2

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Subham Kumar
Subham Kumar
Asked: December 30, 2023In: Class 10 Science

Define resistivity. What are the factors affecting the resistivity of a conductor.

Resistivity is a material property measuring its inherent opposition to electric current flow. It is quantified in ohm-meters (Ω·m) and depends on a substance’s composition and temperature.

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  • 1 1 Answer
  • 40 Views
  • 2 Votes
Answer
Sonal Chauhan
Sonal Chauhan
Asked: December 29, 2023In: Class 10 Science

List two essential conditions for observing a rainbow.

A rainbow is a meteorological phenomenon characterized by a spectrum of colors appearing in the sky due to sunlight refracting, reflecting, and dispersing in water droplets, creating a beautiful, multicolored arc.

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  • 1 1 Answer
  • 114 Views
  • 2 Votes
Answer
Sonal Chauhan
Sonal Chauhan
Asked: December 29, 2023In: Class 10 Science

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

Normal human vision involves light entering the eye, refracting through the cornea and lens, forming a focused image on the retina. Signals are sent to the brain via the optic nerve, enabling clear sight.

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  • 1 1 Answer
  • 34 Views
  • 1 Vote
Answer
Sonal Chauhan
Sonal Chauhan
Asked: December 29, 2023In: Class 10 Science

A person is unable to see objects distinctly placed within 75 cm from his eyes. a) Name the defect of vision the person is suffering from. b) List its two possible causes. c) Calculate the power of the lens needed to correct this defect. Assume that the near point for the normal eye is 25 cm.

Vision defects include myopia (nearsightedness), hyperopia (farsightedness), astigmatism, and presbyopia. These conditions result from abnormalities in the eye’s shape or lens flexibility, affecting the ability to focus clearly.

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  • 1 1 Answer
  • 693 Views
  • 1 Vote
Answer
Sonal Chauhan
Sonal Chauhan
Asked: December 29, 2023In: Class 10 Science

Which hormone is secreted into the blood when you are under stress? Name the gland that secretes this hormone. ii) How does it help the body to cope up in an emergency situation?

Hormones are chemical messengers secreted by glands, regulating various physiological processes. Examples include insulin, estrogen, and adrenaline. They travel through the bloodstream, influencing growth, metabolism, and other bodily functions.

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  • 1 1 Answer
  • 91 Views
  • 1 Vote
Answer
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