Recent questions in Kinematics

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The solids which have negative temperature coefficient of resistance are :

asked Dec 29, 2021 in Kinematics by deepak01 (12.2k points)

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A body weighs \(72 \mathrm{~N}\) on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth?

asked Dec 29, 2021 in Kinematics by deepak01 (12.2k points)

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The energy equivalent of \(0.5 \mathrm{~g}\) of a substance is:

asked Dec 29, 2021 in Kinematics by deepak01 (12.2k points)

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Two cylinders \(A\) and \(B\) of equal capacity are connected to each other via a stop clock. A contains an ideal gas at standard temperature and pressure. \(B\) is completely evacuated. The entire system is thermally insulated. The stop clock is suddenly opened. The process is:

asked Dec 29, 2021 in Kinematics by deepak01 (12.2k points)

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A cylinder contains hydrogen gas at pressure of \(249 \mathrm{kPa}\) and temperature \(27^{\circ} C .\) Its density is : \(\left(R=8.3 J m o l^{-1} K^{-1}\right)\)

asked Dec 29, 2021 in Kinematics by deepak01 (12.2k points)

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The Brewsters angle \(i_{b}\) for an interface should be:

asked Dec 29, 2021 in Kinematics by deepak01 (12.2k points)

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The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is : ( \(c=\) speed of electromagnetic waves)

asked Dec 29, 2021 in Kinematics by deepak01 (12.2k points)

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For which one of the following, Bohr model is not valid?

asked Dec 28, 2021 in Kinematics by kritika (90.1k points)

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A plane electromagnetic wave of frequency \(25 \mathrm{MHz}\) travels in free space along the \(x\) direction. At a particular point in space and time \(E \rightarrow=6.3 \mathrm{j} \wedge \mathrm{Vm}^{-1}\) then \(\mathrm{B} \rightarrow\) at this point is

asked Dec 25, 2021 in Kinematics by kritika (90.1k points)

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A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is :

asked Dec 25, 2021 in Kinematics by kritika (90.1k points)

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A long solenoid has 200 turns per \(\mathrm{cm}\) and carries a current i. The magnetic field at its centre is \(6.28 \times 10^{-2}\) weber \(/ \mathrm{m}^{2}\). Another long solenoid has 100 turns per \(\mathrm{cm}\) and it carries a current \(\mathrm{i} / 3\). The value of the magnetic field at its centre is

asked Dec 25, 2021 in Kinematics by kritika (90.1k points)

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A stone thrown upwards with speed u attains maximum height h, another stone thrown upward from the same point with speed 2u attains maximum height H. What is the relation h & H.

asked Dec 25, 2021 in Kinematics by kritika (90.1k points)

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The first member of the alkyne homologous series is

asked Dec 25, 2021 in Kinematics by kritika (90.1k points)

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Seven capacitors each of capacitance \(2, \ldots F\) are to be connected to obtain a capacitance of \(10 / 11 \mu \mathrm{F}\). Which of the following combination is possible?

asked Dec 25, 2021 in Kinematics by kritika (90.1k points)

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Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5 Ω. The power loss in the wire is

asked Dec 24, 2021 in Kinematics by kritika (90.1k points)

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A satellite is launched into a circular orbit of radius ‘R’ around earth while a second satellite is launched into an orbit of radius 1.02 R. The percentage difference in the time periods of the two satellites is

asked Dec 24, 2021 in Kinematics by kritika (90.1k points)

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An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of \(2 \mathrm{~m} / \mathrm{s}\). The mass per unit length of later in the pipe is 100 \(\mathrm{kg} / \mathrm{m}\). What is the power of the engine?

asked Dec 24, 2021 in Kinematics by kritika (90.1k points)

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The charge flowing through a resistance \(R\) varies with time \(t\) as \(Q=\) at \(-b t^{2}\). where \(a\) and \(b\) are positive constants. The total heat produced in \(R\) is

asked Dec 24, 2021 in Kinematics by kritika (90.1k points)

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\(A B_{1} A_{2}\) and \(B_{2}\) are diatomic molecules. If the bond enthalpies of \(A_{2}, A B\) and \(B_{2}\) are in the ratio \(1: 1: 0.5\) and enthalpy of formation of \(A B\) from \(A_{2}\) and \(B_{2}\) is \(-100 \mathrm{~kJ}\) \(\mathrm{mol}^{-1}\). What is the bond energy of \(\mathrm{A}_{2}\) :

asked Dec 24, 2021 in Kinematics by kritika (90.1k points)

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A metal rod of Young's modulus \(2 \times 10^{10} \mathrm{Nm}^{-2}\) undergoes an elastic strain of \(0.02 \%\) the energy per unit volume stored in the rod in jouleim \(^{3}\) is

asked Dec 24, 2021 in Kinematics by kritika (90.1k points)

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