Recent questions tagged question-paper-1

The radius of first orbit of hydrogen atom is $0.53 A^{\circ}$ and the electron is executing $6.54 \times 10^5 $ revolutions per second . The magnetic moment of electron will be

asked May 11, 2015 by meena.p

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In a PNP transistor working as a common base amplifier current gains $0.96$ and emitter current is $7.2 \;mA$ . The base current is

asked May 11, 2015 by meena.p

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The amount of active substance reduces to $ \large\frac{1}{64} $ of its initial value in 15 hours . What is the half life?

asked May 11, 2015 by meena.p

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At a temperature of $30^{\circ}$the susceptibility of a ferromagnetic material is found to be x. What is its susceptibility at $333^{\circ}$

asked May 11, 2015 by meena.p

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This is

asked May 11, 2015 by meena.p

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The electric field strength in an electro magnetic wave is $10^4 V/m$ The magnetic strength (in Tesla) is

asked May 11, 2015 by meena.p

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A negetively charged oil drop of mass $ 8 \times 10^{-15} \;kg$ remains suspended in a uniform field of $ 2\times 10^4 \;v/m$ in millikani experiment . The number of electrons making up the charge is $(g= 10\;m/s^2)$

asked May 11, 2015 by meena.p

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A box of mass $40\;kg$ is placed on an open truck . The coefficient of friction between the box and the surface of the truck is $0.15$ with what maximum acceleration can the truck move so that the box does not slide out.

asked May 11, 2015 by meena.p

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A car approaching a crossing at a speed of $20 \;m/s$ sounds a horn of frequency of $500\;hz$ . When the car is $80 \;m$ from the crossing. Speed of sound in air is $320\;m/s$ An observer is at a distance of $60\;m$ from the crossing on a road perpendicular to the direction of motion of car. What frequency is heard by the observer .

asked May 11, 2015 by meena.p

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The resistor in which maximum heat will be produced is

asked May 11, 2015 by meena.p

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plot the V-T graph corresponding to the P- T graph for a ideal gas shown in figure .

asked May 11, 2015 by meena.p

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Two thin lenses of same radius of curvature $R= 15\;cm$ of different nature made of different material one having refractive index $\mu_1 =\large\frac{2}{3}$ and another $\mu_2$ . The lenses are kept in contact and immersed in water of refractive index $\mu_w = \large\frac{3}{4}$. The focal length of the system of lenses in water is $30\;cm$ . What is the value of $\mu_2$

asked May 11, 2015 by meena.p

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A simple pendulum is suspended from ceiling of a lift. When the lift is at rest , its time period is $T_0$ with what acceleration should lift be acceleration upward in order to reduce it, time period to $T/2$?

asked May 11, 2015 by meena.p

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A uniform solid sphere is rotating with angular speed of $\omega_0$ about a diameter . The temperature of the solid is suddenly increased by $100^{\circ}$. What will be the new angular speed. $(\alpha = 3 \times 10^{-4}\;per ^{\circ}c)$

asked May 11, 2015 by meena.p

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Two circular plates of radius $5\;cm$ each , have a $0.01 \;mm$ thick water film between them . What will be the force required to separated the plates (surface tension of water = 73 dynes /cm)

asked Apr 30, 2015 by meena.p

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Two spheres of volume $500\;cc$ each of relative density $0.6$ and $1.2 $ are connected by string and the combination is immersed in a liquid. The tension in the string is

asked Apr 30, 2015 by meena.p

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In the circuit as shown in the figure what is the potential difference between P and Q.

asked Apr 30, 2015 by meena.p

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In the circuit as shown in the figure what is the potential difference between P and Q.

asked Apr 30, 2015 by meena.p

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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

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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

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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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The most abundant metal in earth 's trust is

asked Apr 8, 2015 by meena.p

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Calculate the mass of 1.5 gram molecule of sulphuric acid .

asked Apr 8, 2015 by meena.p

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The reaction toluene with chlorine in presence of ferric chloride gives predominately

asked Apr 8, 2015 by meena.p

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The total number of electrons in one molecule of carbon dioxide is :

asked Apr 8, 2015 by meena.p

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In reaction $6NaOH +3cl_2 \to 5 Nacl +A+3 H_2O$ . The oxidation number in 'A' is

asked Apr 8, 2015 by meena.p

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$Zn^{2+}$ dissolves in excess of $NaOH$ due to the formation of :

asked Apr 7, 2015 by meena.p

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Aqueous sodium hydroxide reacts with white phosphorous to form phosphine and

asked Apr 7, 2015 by meena.p

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The total charge required for complete electrolysis is

asked Apr 7, 2015 by meena.p

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Of the following , the metal that cannot be obtained by electrolysis of aqueous solution of their salt are

asked Apr 7, 2015 by meena.p

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The first conization potential of four consecutive elements, present in the second period of the periodic table are $8.3,11.3,14.5$ and $13.6\;ev$ respectively. Which one of the following is the first conization potential (in ev) of nitrogen ?

asked Apr 7, 2015 by meena.p

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The maximum oxidation states shown by $Ru$ and $Os$ , respectively are :

asked Apr 7, 2015 by meena.p

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An aromatic molecule will :

asked Apr 7, 2015 by meena.p

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Two solutions of a substance are mixed in the following manner. $480 \;ml $ of $1.5\;M$ First solution +$520\;ml\;of\;1.2 M$ second solution . What is the molarity of the final mixture?

asked Apr 7, 2015 by meena.p

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The bonds present in $N_2O_5$ are

asked Apr 7, 2015 by meena.p

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Element X is strong electropositive and element Y is strongly electro negative. Both are univalint . The compound formed formed will be

asked Apr 7, 2015 by meena.p

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The chemical formula of feldspar is

asked Apr 7, 2015 by meena.p

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The correct order of stability for the following super oxides is

asked Apr 7, 2015 by meena.p

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An isomer of ethanol is

asked Apr 7, 2015 by meena.p

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