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A disc is performing pure rolling on smooth stationary surface with constant angular velocity as shown. At any instant for the lower most point of the disc.

asked Apr 30, 2015 by meena.p

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A pendulum of mass $0.5 \;kg$ and length $1\;m$ is released from at an angle $\theta= 60^{\circ}$ . What is the power delivered by all force acting on the bob at angle $\theta= 30^{\circ}(g= 10m/s^2)$

asked Apr 30, 2015 by meena.p

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A block is placed an a rough inclined plane at an angle of $45^{\circ}$ . If the force needed to lift is greater than to drag it up along the inclined plane then the coefficient of friction $\mu$ must be

asked Apr 30, 2015 by meena.p

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A stone is projected at a certain angle. Two seconds before it reaches the maximum height it makes $60^{\circ}$ with the horizontal.what is the velocity of the stone at highest point

asked Apr 30, 2015 by meena.p

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Displacement - time curve for a particle moving in a straight line is shown. Then

asked Apr 30, 2015 by meena.p

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The initial and final temperature of a liquid in a container are observed to be $75.3 \pm 0.4^{\circ}$ and $67.7 \pm 0.3^{\circ}C$ . Find the fall in temperature

asked Apr 30, 2015 by meena.p

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Light rays of wave length $6000 A^{\circ}$ and photon intensity $39.6 \;W/m^2$ is incident on metal surface. If only $1 \%$ of photon incident on surface emit photo electrons, than the number of electrons omitted per second per unit area from the surface will be : $(h= 6.64 \times 10^{-34}$ Is ; $c= 3 \times 10^8 m/s)$

asked Apr 30, 2015 by meena.p

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Zn identical metal plates each of area A are placed parallel to each other, equal spiced at distance 'd' between neigh bouring plates. The plates are connected alternatily. The capacitance of the system is

asked Apr 30, 2015 by meena.p

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Zn identical metal plates each of area A are placed parallel to each other, equal spiced at distance 'd' between neigh bouring plates. The plates are connected alternatily. The capacitance of the system is

asked Apr 30, 2015 by meena.p

0 answers

A short linear object of length L lies on the axis of a spherical mirror of focal length f at a distance 'u' from the mirror. Its image has an axial length 'l' equal to

asked Apr 30, 2015 by meena.p

1 answer

Two concentric coils of 10 turns each are situated in the same plane. their radii are $20\;cm$ and $40\;cm$ , they carry $0.2\;A$ and $0.3\;a$ current respectively in opposite directions, the magnetic field(in tesla) at the centre is

asked Apr 30, 2015 by meena.p

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If two coherent source are placed at a distance $5 \lambda$ from each other symmetric to the center of the circle as shown in the figure, then the number of fingers shown on the screen placed along the circumference is

asked Apr 29, 2015 by meena.p

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Input is across A and C output is across B and D . then the output is

asked Apr 29, 2015 by meena.p

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A rectangular loop of length 'l' and breadth 'b' is placed at a distance of x from an infinity long wire carrying current i such that the direction of current is parallel to breadth. If the loop moves away from the current wire in a direction perpendicular to it with a velocity 'v', the magnitude of the emf in the loop is

asked Apr 29, 2015 by meena.p

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In electro chemical corrosion of metals undergoing corrosion

asked Apr 16, 2015 by meena.p

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In electro chemical corrosion of metals undergoing corrosion

asked Apr 16, 2015 by meena.p

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Sodium nitroprusside when added to an alkaline solution of sulphide cons produces a

asked Apr 16, 2015 by meena.p

1 answer

The hybrdisation of carbon in diamond graphite and acetyline is in the order of

asked Apr 16, 2015 by meena.p

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Which alloy contains Mg as one of the constituents

asked Apr 16, 2015 by meena.p

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The bond distance between $C-Cl$ in $Ccl_4$ is $1.76\;A^{\circ}$ . If the atomic radius of $Cl$ is $C$ is $0.77 A^{\circ}$ . The atomic radius of $cl$ is

asked Apr 16, 2015 by meena.p

1 answer

The first conization energy in electron volts of nitrogen and oxygen atom's are respectively given by

asked Apr 15, 2015 by meena.p

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On heating sodium metal in a current of dry ammonia, the compound formed is

asked Apr 15, 2015 by meena.p

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Oxidation number of codine in the following reaction $IO_3^{-1} +HI \to H_2O +I_2$

asked Apr 15, 2015 by meena.p

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When a vapour , at atmospheric pressure was gradually heated from $25^{\circ}$ its colour was found to deepen at first and then to fade as the temperature was raised above $160^{\circ}$ . At $6000^{\circ}$ the vapour was almost colourless , but its colour deepens when the pressure was raised at this temperature , the vapour was

asked Apr 15, 2015 by meena.p

1 answer

A Substance $A_xB_y$ crystallizes in a face centered cubic (FCC) lattice in which 'A' atoms occupy each corner of the cube and 'B' atoms occupy the centers of each face of the cube , Identify the correct composition of the substance $A_xB_y$

asked Apr 15, 2015 by meena.p

1 answer

Fluoxne is better oxidising agent than $Br_2$ . It is due to

asked Apr 15, 2015 by meena.p

1 answer

The solubility product of silver chlorides is $1.5625 \times 10^{-10}$ at $25^{\circ}C$ . Find its solubility in $gL^{-1}$

asked Apr 15, 2015 by meena.p

1 answer

Which of the following reacts with water at high rate?

asked Apr 15, 2015 by meena.p

1 answer

A first order reaction has a rate constant of $15 \times 10^{-3}S^{-1}$ . How long will $5.0 \;g$ of this reactant take to reduce to $3.0 \;g$ ?

asked Apr 15, 2015 by meena.p

1 answer

Which of the following show aromatic character ?

asked Apr 15, 2015 by meena.p

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In the metallurgy of iron, when lime stone is added to the blast furnace, the calcium ion ends up in

asked Apr 15, 2015 by meena.p

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Calculate the maximum work done in expanding $16\;g$ of oxygen at $300\;k$ and occupying a volume of $5dm^3$ isothermally until the volume become $25\;dm^3$

asked Apr 15, 2015 by meena.p

1 answer

What is the oxidation number of sulphere in $Na_2S_4O_6$

asked Apr 15, 2015 by meena.p

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The atomic weight of an element is $23$ and atomic number is 11. The number of protons , electrons and neutron respectively present in the atom of the element are

asked Apr 15, 2015 by meena.p

1 answer

Which of the following complex will give white precipitate with $BaCl_2(aq)$

asked Apr 15, 2015 by meena.p

1 answer

Duraluminium is an alloy of

asked Apr 15, 2015 by meena.p

1 answer

A $5 \%$ solution of cane sugar is isotonic with $0.877 \%$ solution of urea. Calculate the molecular mass of urea if the molecular mass of cane sugar is $342$

asked Apr 13, 2015 by meena.p

1 answer

The value of conic product of water at $393\;K$ is

asked Apr 13, 2015 by meena.p

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On dissolving moderate amount of sodium metal in liquid $NH_3$ at low temperature , Which of the following does not occur ?

asked Apr 13, 2015 by meena.p

1 answer

In Zerewiitinoff's method Grignard 's reagent react with the following

asked Apr 13, 2015 by meena.p

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A sample of a gas occupies a volume of $512 \;mL$ at $20^{\circ}$ and $74\;cm$ of Hg as pressure. what volume would this gas occupy at $STP$ ?

asked Apr 13, 2015 by meena.p

1 answer

The main intermediate formed in the reaction of propene with $HBr$ in presence of peroxide is

asked Apr 13, 2015 by meena.p

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Which of the following has largest de broglie wave length given that all have equal velocity ?

asked Apr 13, 2015 by meena.p

1 answer

The halide which is not hydrolysed is

asked Apr 13, 2015 by meena.p

1 answer

Which of the following is a true statement.

asked Apr 13, 2015 by meena.p

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2,3 Dibromobutane, when heated with zinc dust yields.

asked Apr 13, 2015 by meena.p

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The ratio of e/m for a cathode ray

asked Apr 13, 2015 by meena.p

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Sodium niytrate decomposes above $800^{\circ}$ to give

asked Apr 13, 2015 by meena.p

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Pressure cooker reduces cooking time because

asked Apr 13, 2015 by meena.p

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Hypo phosphorus acid is

asked Apr 13, 2015 by meena.p

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