Recent questions tagged eamcet

The method of connecting the negative pole of battery to $\mathit{p}\;$- material and positive pole to $\mathit{n}\;$-material of a $\mathit{p-n}\;$ junction is called .................... connection.

asked Sep 11, 2013 by meena.p

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A particle of mass $4 \;m $ which is at rest explodes into three fragments. Two of the frangements each of mass $\mathit{m}\;$ are found to move with a speed of $\mathit{v}\;$ each in mutually perpendicular direction. The total energy released in the process is ................ .

asked Sep 11, 2013 by meena.p

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If $ 4 \times 10^{20}$ eV of energy is required to move a charge of $6.25 \;C$ between two points, the PD between them is ............ volts.

asked Sep 11, 2013 by meena.p

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A simple harmonic oscillation is represented by the equation $\gamma =0.40 \sin \bigg[\large\frac{40\;t}{7}$$+0.61\bigg]$ where $\gamma$ and $\mathit{t}\;$ are in meters and seconds respectively. The value of time period is ........... sec.

asked Sep 11, 2013 by meena.p

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To minimize spherical aberration two lenses of focal length $\mathit{f_1}\;$ and $\mathit{f_2}\;$ are placed with a distance of separation equal to .................. .

asked Sep 11, 2013 by meena.p

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A body of mass $\mathit{m}\;$ thrown horizontally with velocity $\mathit{v}\;$, from the top of tower of height $\mathit{h}\;$, touches the level of ground at a distance of 250 m from the foot of the tower. A body of mass $2\mathit{m}\;$, thrown horizontally with velocity $\mathit{v/}\;2$, from the top of a tower of height $4\mathit{\;h}\;$ will touch the level ground at a distance .................. meters from the foot of the tower.

asked Sep 11, 2013 by meena.p

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When the radius of a circular current carrying coil is doubled, and current in it is halved, the magnetic dipole moment of coil originally 4 units become ............... units.

asked Sep 11, 2013 by meena.p

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If the escape velocity on earth is 11.2 km/sec, its value for a planet having double the radius and 8 times the mass of earth is .............. m/s.

asked Sep 11, 2013 by meena.p

1 answer

Five equal capacitors connected in series have a resultant capacitance of $4 \mu F$. The total energy stored in these when these are connected in parallel and charged to $400\; V$, is ................ joules.

asked Sep 11, 2013 by meena.p

0 answers

A body freely falling from rest has a velocity $\mathit{v}\;$ after it falls through a distance $\mathit{h}\;$. The distance it has to fall down further, for its velocity to become double, is .................. times $\mathit{h}\;$.

asked Sep 11, 2013 by meena.p

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In deriving Newton's formula for velocity of sound, the changes in volume of air are assumed to be ................. .

asked Sep 11, 2013 by meena.p

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A railway truck of mass $\mathit{m}\;= 2 \times 10 ^4\;kg$ travelling at $0.5\; m/s$ collides with another of half of its mass moving in opposite direction with a velocity $0.4\; m/s $. If they collide each other the combined velocity is ................... m/s.

asked Sep 11, 2013 by meena.p

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A double convex lens of $\mathit{f}\;=6$ cm is made of glass of refractive index $1.5$. The radius of curvature of the surface which is doubled that of other surface will be ................... cm.

asked Sep 11, 2013 by meena.p

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In photoelectric effect the slope of straight line graph between stopping potential and frequency of incident radiation gives the ratio of Planck constant to ................ .

asked Sep 11, 2013 by meena.p

2 answers

A ball of 1 g released down an inclined plane describes a circle of radius 10 cm in the vertical plane on reaching the bottom. The minimum height of the inclined plane is ................ cm.

asked Sep 11, 2013 by meena.p

1 answer

The resistance to be used to convert a $50\; \Omega$ resistance galvanometer of 10 mA into 500 V range voltmeter is ................. .

asked Sep 11, 2013 by meena.p

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Ice contracts on melting when subjected to pressure and the pressure is increased the melting point .................... .

asked Sep 11, 2013 by meena.p

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A body vibrating with a certain frequency sends waves of wavelength 15 cm in a medium $\mathit{A}\;$ and 20 cm in medium $\mathit{B}\;$. If $\mathit{v}\;$ of waves in $\mathit{A}\;$ is 120 m/s. That in $\mathit{B}\;$ will be ................ m/s.

asked Sep 11, 2013 by meena.p

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A car tyre has air at 1.5 atm at 300 K. If $\mathit{P}\;$ increases to 1.75 atm with $\mathit{V}\;$ same. The temperature will be ............... .

asked Sep 11, 2013 by meena.p

0 answers

From Bohr's theory when electrons jump from higher energy orbits to second orbit spectral lines that occur belongs to ................ series.

asked Sep 10, 2013 by meena.p

1 answer

The energy level stationed at the center of forbidden energy gap of an intrinsic semiconductor is .............. .

asked Sep 10, 2013 by meena.p

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If surface tension of $H_2O$ is $7.3 \times 10^{-2}\; N/m$. The excess pressure inside spherical drop of radius 1 mm is ............. $N/m^2$.

asked Sep 10, 2013 by meena.p

0 answers

A radioactive source has a half- life of 3 hours. A freshly prepared sample of the same exhibits radioactivity 16 times the permissible safe value. The minimum time after which it would be possible to work safely with the source is ............ hours.

asked Sep 10, 2013 by meena.p

1 answer

If $\overrightarrow {A}, \overrightarrow {B}$ are perpendicular vectors $ \overrightarrow {A}=5 \hat {i}+7 \hat {j}-3 \hat {k}.\quad \overrightarrow {B}=2 \hat {i}+2 \hat {j}-c \hat {k}$. The value of $\mathit{c}\;$ is:

asked Sep 10, 2013 by meena.p

1 answer

When a material is placed in magnetic field B but opposite in direction is reduced. The material is:

asked Sep 10, 2013 by meena.p

1 answer

A piece of aluminium and germanium each are cooled from $T_1\;K $ to $T_2\;K$. The resistance of:

asked Sep 10, 2013 by meena.p

1 answer

A charge $\mathit{q}\;$ is placed at the center of line joining two equal charges Q. The system of 3 charges will be in equilibrium if $\mathit{q}\;$ is equal to:

asked Sep 10, 2013 by meena.p

1 answer

$\phi$ of vibration of any particle in a standing wave produced along a stretched string depends on:

asked Sep 10, 2013 by meena.p

1 answer

Light of frequency 1.5 times the threshold frequency, incident on a photo sensitive material. If the frequency of incident light is halved and the intensity is doubled the photo current becomes:

asked Sep 10, 2013 by meena.p

1 answer

The work done to get n smaller equal size spherical drops from a bigger size spherical drop of water is proportional to :

asked Sep 10, 2013 by meena.p

1 answer

The average force that is necessary to stop a hammer with $25 $ N/s momentum in 0.05 $s$ is:

asked Sep 10, 2013 by meena.p

1 answer

A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulting handles:

asked Sep 10, 2013 by meena.p

1 answer

A wooden block is dropped from the top of a cliff 100 m high. Simultaneously a bullet of mass 10 g is fired from the foot of the cliff upwards with a velocity of 100 m/s. The bullet and wooden block will meet each other after a time

asked Sep 10, 2013 by meena.p

1 answer

The total mechanical energy of a harmonic oscillator of $A=1$ m and force constant $200 N/m$ is 150 J. Then:

asked Sep 10, 2013 by meena.p

1 answer

Earth is flattened at poles and bulging at the equator. This is due to:

asked Sep 10, 2013 by meena.p

1 answer

The Spheres of different materials one with double the radius and one-fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in large radius one is 25 minutes and that for smaller one is 16 minutes, the ratio of thermal conductivities of materials of large sphere to small sphere is:

asked Sep 10, 2013 by meena.p

1 answer

Keeping the banking angle same, to increase the maximum speed with which a vehicle can travel on a curved road by 10 percent the radius of curvature of the road has to be changed from 20 m to :

asked Sep 10, 2013 by meena.p

1 answer

An element '$\mathit{X}$' decays first by positron emission and then two $\alpha$ - particles are emitted in successive radioactive decay. If the product nucleus has mass number 227and atomic number 89 the mass number and atomic number of element '$\mathit{X}$' are:

asked Sep 10, 2013 by meena.p

1 answer

If the work done in stretching a wire by 1 mm is 2 J, the work necessary for stretching another wire of same material but with double radius of cross-section and the half the length by 1 mm (joule) is:

asked Sep 10, 2013 by meena.p

1 answer

A charged bead is capable of sliding freely through a string held vertically in tension. An electric field is applied parallel to the string, so that the bead stays at rest at middle of the string. If the electric field is switched off momentarily switched on:

asked Sep 10, 2013 by meena.p

1 answer

The pair of physical quantities having the same dimensional formula is:

asked Sep 10, 2013 by meena.p

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If '$\mathit{c}$' is velocity of light in free space, the time taken by the light to travel a distance '$\mathit{x}$' in a medium of refractive index '$\mu$' is given by :

asked Sep 10, 2013 by meena.p

1 answer

The apparent coefficient of expansion of a liquid, when heated in a copper vessel is '$\mathit{c}$' and when heated in a silver vessel is '$\mathit{s}$'. If '$\mathit{A}$' is the linear coefficient of expansion of copper then linear coefficient of expansion of silver is :

asked Sep 10, 2013 by meena.p

1 answer

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