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Latest Question and Answer

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What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?

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What are the advantages and disadvantages of usimi - a solar cocker? Are there places where solar cookers would have limited utility?

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What are the qualities of an ideal source of energy?

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On what basis would you classify energy sources as

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What are the limitations of extracting energy from- (a) the wind? (b) waves? (c) tides?

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Compare and contrast bio-mass and hydro electricity as sources of energy.

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What is the function of an earth wire?

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When does an electric short circuit occur?

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State the rule to determine the direction of a

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Two circular coils $A$ and $B$ are placed closed to each other. If the current in the coil $A$ is changed, will some current be induced in the coil $\mathrm{B}$ ? Give reason.

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A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (a) pushed into the coil, (b) withdrawn from inside the coil, (c) held stationary inside the coil?

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Name some devices in which electric motors are used.

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Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?

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When is the force experienced by a current-carrying conductor placed in a magnetic field largest?

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How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet?

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Why should a voltmeter have a high resistance?

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Why is a voltmeter connected in parallel across a circuit element?

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Why is an ammeter connected in series in a circuit?

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What is the resistance of a closed plug-key?

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What is the resistance of an air gap?

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What is the function of rheostat in an electric circuit?

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What is difference between resistance and resistor?

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Name the physical quantity whose unit is volt/ ampere.

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Name and define the S1 unit of resistance.

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What is meant by resistance of a conductor?

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State Ohm's law. Give its mathematical expression.

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State the relationship between 1 volt and 1 joule.

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Define the SI unit of electric potential difference.

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What is meant by potential difference berween mo points? What is the SI unit of potential difference?

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Is electric potential a scalar or vector quantity?

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Define electric potential of 1 volt.

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What is SI unit of electric potential?

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How is electric potential analogous to temperature

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Define electric field.

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Calculate the number of electrons constituting one coulomb of charge.

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Define the unit of current.

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What does an electric circuit mean?

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State the relationship between 1 ampere and 1 coulomb.

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Distinguish between conductors and insulators. Give some of their examples.

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What constitutes an electric current?

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Why does the sky appear dark instead of blue to an astronaut?

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Why does the Sun appear reddish early in the morning?

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

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Why is a normal eye not able to see clearly the objects placed closer than $25 \mathrm{~cm}$ ?

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Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is $1 \mathrm{~m}$. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is $25 \mathrm{~cm}$.

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The far point of a myopic person is $80 \mathrm{~cm}$ in front of the eye. What is the nature and power of the lens required to correct the problem?

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A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (a) distant vision, and (b) near vision?

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What is the physical significance of refractive index?

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Briefly explain the cause of refraction of light.

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State the laws of refraction of light.

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