Draw magnetic field lines around a bar m | Class 10 Science Chapter Magnetic effects of Electric Current, Magnetic effects of Electric Current NCERT Solutions

When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.

Outline a project which aims to find the dominant coat colour in dogs.

Draw the structure for the following compounds.                

       (i)    Ethanoic acid             (ii)   Bromopentane*
       (iii)  Butanone                   (iv)   Hexanal.

*Are structural isomers possible for bromopentane?

A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?

How is the sex of the child determined in human beings?

(a)  What property do all elements in the same column of the Periodic Table as boron have in common?
(b)  What property do all elements in the same column of the Periodic Table as fluorine have in common?

Calculate the number of electrons constituting one coulomb of charge.

A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?

What is an homologous series? Explain with an example.

Why is variation beneficial to the species but not necessarily for the individual?

Name two safety measures commonly used in electric circuits and appliances.

What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?

What happens to the image distance in the eye when we increase the distance of an object from the eye?

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

Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?

What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?

A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?

Why is respiration considered an exothermic reaction? Explain.

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Explain some harmful effects of agricultural practices on the environment.