Question
What will happen if switch is connected in ‘neutral wire’?
✓
Answer
If switch is connected in the neutral wire, an electric appliance, e.g., an electric iron will remain connected to the live wire even when the switch is off and so if any one happens to touch the appliances; he of she will get a shock which is sometimes fatal.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
State two advantages of ‘the ring system of house wiring’.
For the same kinetic energy of a body, what should be the change in its velocity if its mass is increased nine times?
(i) A mucleus ${ }_2^{ A } X$ emits an alpha particle followed by $\gamma$ emission; thereafter it emits two $\beta$ particles to form $X _3$.
(a) Copy and complete the values of A and Z for $X _3$ :
$\frac{Z}{Z} X \xrightarrow{-a} X_1 \xrightarrow{-y} X_2 \xrightarrow{-28} \underset{\ldots}{\cdots} X_3$
(b) Out of alpha ( $\alpha$ ), beta ( $\beta$ ) and gamma ( $\gamma$ ) radiations -
(i) Which radiation is the most penetrating?
(ii) Which radiations are negatively charged?
(ii) (a) What happens to the atomic number of an element, when it emits :
(i) an alpha particle;
(ii) a beta particle?
(b) Explain why alpha and beta particles are deflected in an electric or a magnetic field but gamma rays are not deflected in such a field.
(iii) A nucleus ${ }_{11} Na ^{24}$ emits a beta particle to change into magnesium ( Mg ).
(a) Write the symbolic equation for the process.
(b) What are numbers 24 and 11 called?
(c) What is the general name of ${ }_{12}^{24} Mg$ with respect to ${ }_{11}^{24} Na$ ?
→(a) Copy and complete the values of A and Z for $X _3$ :
$\frac{Z}{Z} X \xrightarrow{-a} X_1 \xrightarrow{-y} X_2 \xrightarrow{-28} \underset{\ldots}{\cdots} X_3$
(b) Out of alpha ( $\alpha$ ), beta ( $\beta$ ) and gamma ( $\gamma$ ) radiations -
(i) Which radiation is the most penetrating?
(ii) Which radiations are negatively charged?
(ii) (a) What happens to the atomic number of an element, when it emits :
(i) an alpha particle;
(ii) a beta particle?
(b) Explain why alpha and beta particles are deflected in an electric or a magnetic field but gamma rays are not deflected in such a field.
(iii) A nucleus ${ }_{11} Na ^{24}$ emits a beta particle to change into magnesium ( Mg ).
(a) Write the symbolic equation for the process.
(b) What are numbers 24 and 11 called?
(c) What is the general name of ${ }_{12}^{24} Mg$ with respect to ${ }_{11}^{24} Na$ ?
The following diagram shows an object $A B$ and a converging lens $L$ with foci $F_1$ and $F_2$.
Draw two rays from the object and complete the diagram to locate the position of the image. Mark the image $C D$. Clearly mark on the diagram the position of the eye from where the image can be viewed.
→Draw two rays from the object and complete the diagram to locate the position of the image. Mark the image $C D$. Clearly mark on the diagram the position of the eye from where the image can be viewed.
Define the principal focus of a convex lens.
State three factors on which loundess of sound heard by a listener depends.
A particular resistance wire has a resistance of 3 ohm per meter. Find :
The total resistance of three lengths of this wire each 1.5 m long, in parallel.
A wheel of diameter2 m is shown in the figure with the axle at O. A force F = 2 N is applied at B in the direction shown in the figure. Calculate the moment of force about Centre O and point A.
A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens.
(a) What special name is given to this point on the principal axis?
(b) Draw a labelled diagram to support your answer in part (a)
(a) What special name is given to this point on the principal axis?
(b) Draw a labelled diagram to support your answer in part (a)
Define the principal axis.