Finger prints on a piece of paper may be...

Finger prints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking it into

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sun light

Infra red light

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Finger prints on a piece of paper may be detected by sprinkling flourescent powder on the paper and then looking it into

One side of a rectangular piece of paper is 6 cm, the adjacent sides being longer than 6 cms. One corner of the paper is folded so that it sets on the opposite longer side. If the length of the crease is l cms and it makes an angle theta with the long side as shown, then l is

Why does a piece of paper appear white in sunlight ? How would you expect it to appear when viewed in red light?

The diagram above shows a wire stretched over a sonometer. Stems of two vibrating tuning forks A and B are touched to the wooden box of the sonometer. It is observed that the paper rider (a small piece of paper folded at the centre) present on the wire flies off when the stem of vibrating tuning fork B is touched to the wooden box but the paper just vibrates when the stem of vibrating tuning fork A is touched to the wooden box. Name the phenomenon when the paper rider flies off.

The diagram below shows a wire stretched over a sonometer. Stems of two vibrating tuning forks A and B are touched in turn to the wooden box of the sonometer. It is observed that the paper rider (a small piece of paper folded at the centre) present on the wire flies off when the stem of vibrating tuning fork B is touched to the wooden box but the paper just vibrates when the stem of vibrating tuning fork A is touched to the wooden box. Name the phenomenon when the paper rider just vibrates.

The diagram above shows a wire stretched over a sonometer. Stems of two vibrating tuning forks A and B are touched to the wooden box of the sonometer. It is observed that the paper rider (a small piece of paper folded at the centre) present on the wire flies off when the stem of vibrating tuning fork B is touched to the wooden box but the paper just vibrates when the stem of vibrating tuning fork A is touched to the wooden box. Why does the paper rider fly off when the stem of tuning fork B is touched to the box ?

One end of each of two identical springs, each of force constant 0.5N//m are attached on the opposite sides the a wooden block of mass 0.01kg . The other ends of the spring are connected to separate rigid supports such that the springs are unstrtched and are collinear in a horizontal plane. To the wooden piece is fixed a pointer which touches a vertically moving plane paper. The wooden piece kept on a smooth horizontal table is now displaced by 0.02m along the line of springs and released. If the speed of paper is 0.1m//s , find the equation of the path traced by the pointer on the paper and the distance between two consecutive maximum on this path.

Mark two points, A\ a n d\ B on a piece of paper and join them. Measure this length. For each of the following draw a line segment C D that is: equal to the segment A B (ii) Twice A B Three times A B (iv) half A B collinear with A B and is equal to it.

When a charged comb is brought near a small piece of paper, it attracts the piece. Does the paper, it attracts the piece. Does the paper become charged when the conb is brought near it ?

From a piece of paper in the shape of a regular hexagon, sectors of circles with the centre at the vertices are removed as shown in the figure. Find the fraction of the vertices are removed as shown in the figure. Find the fraction of the piece of paper left. Also find the perimeter of the piece of paper left in terms of a side of the hexagon

AAKASH SERIES-ELECTROMAGNETIC WAVES-EXERCISE -IA

Practically ozone layer absorbs the radiation of wavelength
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A radiation of energy E falls normally on a perfectly reflecting surfa...
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The type of electromagnetic wave propagation which is effected as a re...
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X-rays are known as to be electromagnetic radiation. Therefore the X-...
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The altitude of the ozone layer in the atmosphere and the ‘type’ of th...
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Four atmospheric layers are given below, namely (i) stratosphere (ii) ...
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Infrared radiations are detected by
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Finger prints on a piece of paper may be detected by sprinkling fluore...
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The atmosphere above the height of 80 km is called
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The frequency from 3Hz to 30MHz is known as
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The frequency from 3xx10^(9) Hz to 3xx10^(10) Hz is
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A cube of edge a has its edges parallel to X, Y and Z -axis of rectang...
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Green house effect is
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One requires 11eV of energy to dissociate a carbon monoxide molecule i...
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The ratio of contributions made by the electric field and magnetic fie...
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An electromagnetic wave radiates outwards from a dipole antenna, with ...
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A variable frequency AC source is connected a capacitor . How will the...
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The condition under which a microwave oven heats up a food item conta...
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Match List-I (Electromagnetic wave type) with List-II (Its association...
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Electromagnetic waves with wavelength (i) lambda(1) is used in satel...
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