Priyanka B Solutions for Chapter: Sample Paper-2, Exercise 1: Sample Paper-2

Draw a schematic diagram of common domestic circuit.

State the function of fuse and earth wire.

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

Name three forms of energy in which energy from ocean is made available for use. What are OTEC power plants?

Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?

A $4 \mathrm{cm}$ tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is $12 \mathrm{cm}$ and its sharp image is formed at a distance of $24 \mathrm{cm}$ from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?
 

                                 $\left(A\right)$                                                                                    $\left(B\right)$

To study the dependence of current ($I$), on the potential difference ($V$) across a resistor $R$, two students used the two set ups shown in figure $A$and $B$respectively. They kept the contact point $J$in the four different positions marked (1), (2), (3) and (4) in the two figures. For both the students, the ammeter and voltmeter reading will be maximum when the contact $J$is in the position.

(A)

(B)

To study the dependence of current ($I$), on the potential difference ($V$) across a resistor $R$, two students used the two set-ups shown in figure $A$and $B$respectively. They kept the contact point $J$in the four different positions marked (1), (2), (3) and (4) in the two figures. In the above experiment if a graph is drawn between $V$ and $I$, what will be the nature of graph? Draw the graph.