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How will the resistance be affected if the various parameters are changed as follows?

$\begin{array}{cc}\text{i) Length increases}& \text{x) Resistance increases}\\ \text{ii) Area increases}& \text{y) Resistance decreases}\\ \text{iii) Resistivity decreases}& \text{z) Resistance remains the same}\\ \text{iv) Temperature increases}& \\ \text{v) Velocity increases}& \end{array}$

A uniform wire of resistance $100\Omega$ is melted and recasted into a wire of length twice that of the original. The resistance of the new wire is _____.

Sir

I am Shaun job of class 10, I have a doubt regarding physics on the topic of optics,

This is the question Sir

Why do wet clothes appear darker than dry clothes?

Thank you so much for your time Sir

Shaun

How much heat energy is necessary to raise the temperature of 5 kg of water

from 20^oC to 100^oC ?

Red light is used for danger signal as

1. -20

A steering wheel of diameter 0.5 m is rotated anticlockwise by applying two forces each of magnitude 5 N. Draw a diagram to show the application of forces and calculate the moment of the forces applied.

The range of the wavelength of those electromagnetic waves which are visible to us is

How does the resistance of a wire vary with its cross-sectional areal?

Identify the part of the human ear that converts sound into electrical impulses.

Draw magnetic field lines around a bar magnet. [3 MARKS]

Electric generators convert

1. 8.5

(a) What is a fuel? Give five examples of fuels.
(b) What are the characteristics of an ideal fuel (or good fuel) ?
(c) The calorific value and ignition temperature of fuel A re 55 kj/g and ${80}^{\circ }C,$ respectively. These values for fuel B are 80 kj/g and ${10}^{\circ }C,$ respectively. On burning, the fuel A produces $C{O}_{2}and{H}_{2}O$ while the fuel B produces $C{O}_2,COandS{O}_2$. Give three points of relative advantages and disadvantages of these two fuels.

Snell’s law of refraction is given by

Shown in the figure is a semicircular metallic strip that has thickness $t$ and resistivity $\rho$ . Its inner radius is $R_1$ and outer radius is $R_2$ . If a voltage $V_0$ is applied across its two ends, a current $I$ flows in it. The value of current $I$ is given by :

The following diagrams show the splitting up of a composite light into its constituent colours.



Which among the above figures is correct?

A 1cm object is placed perpendicular to the principal axis of a convex mirror of focal length 7.5cm. Its distance from the mirror if the image formed is 0.6cm in size is-

Fusion stops in stars due to which the nuclei of which element being produced?

A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with one another. (a) What is the power of this combination ? (b) What is the focal length of this combination ? (c) Is this combination converging or diverging ?

A brick stone of mass $5\text{kg}$ is at a height above the ground. If the potential energy of the stone is $100\text{J}$. Find the height of the stone with respect to the ground.

(Take $g=10{\text{m s}}^{-2}$)

For the coil in the diagram below, when the switch is pressed :

(a) what is the polarity of end A ?

(b) which way will the compass point then ?

A lens having two spherical surfaces bulging outward is called ______________.

Two thin lenses of focal lengths, $f_1$ and $f_2$ are in contact and coaxial. The combination is equivalent to a single lens of power: