| 2024-05-10 | Match the following:
.... | 5:09 | 2 | |
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| 2024-05-10 | Which of the following statements is correct about the reaction given below:4Fe(s)+3O2(g)→2.... | 6:37 | 0 | |
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| 2024-05-10 | A solution is prepared by adding 2g of a substance A to 18 g of water. Calculate the mass per ce.... | 2:09 | 1 | |
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| 2024-05-10 | Match the following:
.... | 4:40 | 1 | |
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| 2024-05-10 | Assertion (A): The empirical mass of ethene is half of its molecular mass.Reason (R): The empiri.... | 4:10 | 0 | |
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| 2024-05-10 | Which of the following statements about a compound is incorrect?.... | 5:06 | 2 | |
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| 2024-05-10 | Assertion (A): No. of moles of H2 in 0.224 L of hydrogen is 0.01 mole.Reason (R): 22.4 L of.... | 3:50 | 0 | |
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| 2024-05-10 | One mole of any substance contains 6.022×1023 atoms/ molecules. Number of molecules o.... | 5:01 | 4 | |
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| 2024-05-10 | What is the mass percent of carbon in carbon dioxide?.... | 2:46 | 0 | |
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| 2024-05-10 | 6.02×1020 molecules of urea are present in 100 mL of its solution. The concentration of th.... | 3:12 | 1 | |
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| 2024-05-10 | The maximum and minimum distances of a comet from the Sun are \(1.6 \times 10^{12} \mathrm{~m}\).... | 2:22 | 2 | |
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| 2024-05-10 | The mass density of a spherical galaxy varies as Kr over a large distance ' r ' from it s centre.... | 3:02 | 4 | |
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| 2024-05-10 | A rocket has to be launched from earth in such a way that it never returns. If \(E\) is the mini.... | 3:58 | 2 | |
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| 2024-05-10 | Two stars of masses \(m\) and \(2 m\) at a distance \(d\) rotate about their common centre of ma.... | 2:56 | 4 | |
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| 2024-05-10 | If the distance of the earth from Sun is \(1.5 \times 10^{6} \mathrm{~km}\). Then the distance o.... | 1:54 | 1 | |
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| 2024-05-10 | The distance between Sun and Earth is \(R\). The duration of year if the distance between Sun an.... | 1:20 | 0 | |
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| 2024-05-10 | An asteroid is moving directly towards the centre of the earth. When at a distance of \(10 R\) (.... | 3:53 | 1 | |
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| 2024-05-10 | Two satellites \(P\) and \(Q\) are moving in different circular orbits around the Earth (radius .... | 3:08 | 0 | |
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| 2024-05-10 | Two spherical stars \(A\) and \(B\) have densities \(\rho_{A}\) and \(\rho_{B}\), respectively. .... | 6:58 | 0 | |
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| 2024-05-10 | Two satellites \(S_{1}\) and \(S_{2}\) are revolving in circular orbits around a planet with rad.... | 1:19 | 1 | |
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| 2024-05-10 | Two satellites of masses \(m\) and \(3 m\) revolve around the earth in circular orbits of radii .... | 1:50 | 2 | |
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| 2024-05-10 | On the \(x\)-axis and at distance \(x\) from the origin, the gravitational field due to a mass d.... | 4:33 | 2 | |
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| 2024-05-10 | The temperature, at which the root mean square velocity of hydrogen molecules equals their escap.... | 2:29 | 1 | |
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| 2024-05-10 | The initial velocity \(v_{i}\) required to project a body vertically upward from the surface of .... | 3:27 | 1 | |
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| 2024-05-10 | Four spheres each of mass \(m\) form a square of side \(d\) (as shown in figure). A fifth sphere.... | 3:01 | 4 | Show |
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| 2024-05-10 | The radius (in kilometre) to which the present radius of earth \((R=6400 \mathrm{~km})\) to be c.... | 1:43 | 0 | |
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| 2024-05-10 | If the angular velocity of earth's spin is increased such that the bodies at the equator start f.... | 2:17 | 2 | |
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| 2024-05-10 | Consider a spherical gaseous cloud of mass density \(\rho(r)\) in free space where \(r\) is the .... | 5:11 | 4 | |
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| 2024-05-10 | The value of acceleration due to gravity at Earth's surface is \(9.8 \mathrm{~ms}^{-2}\). The al.... | 2:19 | 0 | |
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| 2024-05-10 | A box weights \(196 N\) on a spring balance at the north pole. Its weight recorded on the same b.... | 2:29 | 0 | |
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| 2024-05-10 | The mass density of a planet of radius \(R\) varies with the distance \(r\) from its centre as \.... | 4:47 | 2 | |
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| 2024-05-10 | If the acceleration due to gravity experienced by a point mass at a height \(h\) above the surfa.... | 1:40 | 0 | |
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| 2024-05-10 | Assuming the earth to be a sphere of uniform mass density, the weight of a body at a depth \(d=\.... | 1:40 | 1 | |
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| 2024-05-10 | A solid sphere of radius \(R\) gravitationally attracts a particle placed at \(3 R\) from its ce.... | 3:28 | 1 | |
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| 2024-05-10 | Consider two solid spheres of radii \(R_{1}=1 \mathrm{~m}, R_{2}=2 \mathrm{~m}\) and masses \(M_.... | 2:01 | 0 | |
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| 2024-05-10 | Two identical particles each of mass ' \(m\) ' go round a circle of radius \(a\) under the actio.... | 1:36 | 0 | |
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| 2024-05-10 | Two objects of equal masses placed at certain distance from each other attracts each other with .... | 2:17 | 0 | | Each Other
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| 2024-05-10 | The distance of a planet from the sun is 5 times the distance between the earth and the sun. The.... | 2:59 | 4 | |
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| 2024-05-10 | The figure shows the motion of a planet around the sun in an elliptical orbit with sun at the fo.... | 2:03 | 2 | Show |
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| 2024-05-10 | A satellite of mass \(m\) is circulating around the earth with constant angular velocity. If rad.... | 1:53 | 0 | |
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| 2024-05-10 | Two planets move around the sun. The periodic times and the mean radii of the orbits are \(T_{1}.... | 1:13 | 1 | |
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| 2024-05-10 | The period of a satellite in a circular orbit of radius \(R\) is \(T\), the period of another sa.... | 1:11 | 1 | |
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| 2024-05-10 | A satellite which is geostationary in a particular orbit is taken to another orbit. Its distance.... | 2:18 | 1 | |
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| 2024-05-10 | An earth satellite S has an orbit radius which is 4 times that of a communication satellite C. T.... | 2:58 | 0 | |
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| 2024-05-10 | Kepler discovered.... | 0:43 | 0 | |
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| 2024-05-10 | Orbit of a planet around a star is.... | 0:16 | 0 | |
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| 2024-05-10 | If \(v_{e}\) and \(v_{\mathrm{o}}\) represent the escape velocity and orbital velocity of a sate.... | 1:35 | 3 | |
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| 2024-05-10 | Select the correct statement from the following..... | 3:04 | 2 | |
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| 2024-05-10 | For a satellite escape velocity is \(11 \mathrm{~km} / \mathrm{s}\). If the satellite is launche.... | 1:34 | 0 | |
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| 2024-05-10 | Which of the following statements is correct in respect of a geostationary satellite?.... | 0:45 | 2 | |
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| 2024-05-10 | The ratio of the K.E. required to be given to the satellite to escape earth's gravitational fiel.... | 1:47 | 1 | |
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| 2024-05-10 | Which is constant for a satellite in orbit?.... | 0:37 | 1 | |
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| 2024-05-10 | If the radius of a planet is \(R\) and its density is \(\rho\), the escape velocity from its sur.... | 2:12 | 0 | |
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| 2024-05-10 | A body is projected vertically upwards from the surface of a planet of radius \(R\) with a veloc.... | 4:47 | 2 | |
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| 2024-05-10 | The escape velocity from the earth is about \(11 \mathrm{~km} / \mathrm{second}\). The escape ve.... | 2:34 | 6 | |
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| 2024-05-10 | A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and .... | 1:08 | 0 | |
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| 2024-05-10 | Energy required to move a body of mass \(m\) from a point at a distance \(R\) from surface of ea.... | 3:00 | 1 | |
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| 2024-05-10 | The gravitational potential energy of a body of mass ' \(m\) ' at the earth's surface is \(-m g .... | 2:14 | 1 | |
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| 2024-05-10 | The escape velocity of a projectile from the earth is approximately.... | 0:34 | 0 | |
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| 2024-05-10 | There are two bodies of masses \(100 \mathrm{~kg}\) and \(10000 \mathrm{~kg}\) separated by a di.... | 3:29 | 9 | |
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| 2024-05-10 | The mass of the earth is \(6.00 \times 10^{24} \mathrm{~kg}\) and that of the moon is \(7.40 \ti.... | 2:19 | 0 | |
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| 2024-05-10 | A body of mass \(m\) rises to height \(h=R / 5\) from the earth's surface, where \(R\) is earth'.... | 3:48 | 0 | |
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| 2024-05-10 | In a gravitational field, at a point where the gravitational potential is zero.... | 1:33 | 4 | | Gravitational
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| 2024-05-10 | Acceleration due to gravity on moon is \(1 / 6\) of the acceleration due to gravity on earth. If.... | 3:40 | 2 | |
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| 2024-05-10 | If the angular speed of the earth is doubled, the value of acceleration due to gravity \((\mathr.... | 2:24 | 0 | |
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| 2024-05-10 | Assume that the acceleration due to gravity on the surface of the moon is 0.2 times the accelera.... | 3:06 | 2 | |
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| 2024-05-10 | What will be the acceleration due to gravity at height \(h\) if \(h \gg>R\), where \(R\) is r.... | 0:59 | 3 | |
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| 2024-05-10 | If the earth suddenly shrinks (without changing mass) to half of its present radius, the acceler.... | 1:34 | 1 | |
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| 2024-05-10 | A body weighs \(700 \mathrm{gm}\) wt on the surface of the earth. How much will it weigh on the .... | 2:29 | 0 | |
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| 2024-05-10 | The radius of the earth is \(6400 \mathrm{~km}\) and \(g=10 \mathrm{~m} / \mathrm{sec}^{2}\). In.... | 3:20 | 0 | |
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| 2024-05-10 | Select the wrong statement.
The acceleration due to gravity ' \(g\) ' decreases if.... | 2:01 | 1 | |
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| 2024-05-10 | Two identical solid copper spheres of radius \(R\) placed in contact with each other. The gravit.... | 3:02 | 1 | |
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| 2024-05-10 | When a body is taken from the equator to the poles, its weight.... | 2:29 | 0 | |
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| 2024-05-10 | A solid metallic sphere is placed in vacuum. It is given a small charge. Due to the sphere, the .... | 1:37 | 2 | |
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| 2024-05-10 | (i) State Kepler's \(3^{\text {rd }}\) law of planetary motion.
(ii) What is the time period in .... | 7:18 | 5 | |
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| 2024-05-10 | The time period of a simple pendulum on a freely moving artificial satellite is.... | 1:33 | 1 | |
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| 2024-05-10 | Which of the following statements about the gravitational constant is true?.... | 1:53 | 1 | |
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| 2024-05-10 | Two particles of equal mass go round a circle of radius \(\mathrm{R}\) under the action of their.... | 3:16 | 3 | |
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| 2024-05-10 | If the distance between two masses is doubled, the gravitational attraction between them.... | 2:51 | 0 | |
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| 2024-05-10 | Write some uses of
(i) Geostationary satellites
(ii) Polar satellites.... | 4:09 | 1 | |
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| 2024-05-10 | Deduce the relation between the orbital velocity of satellite close to earth's surface and escap.... | 5:34 | 2 | |
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| 2024-05-10 | Earth binds the atmosphere because of.... | 1:22 | 0 | |
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| 2024-05-10 | The radii of two planets are \(R\) and \(2 R\) respectively and their densities are \(\rho\) and.... | 4:05 | 1 | |
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| 2024-05-10 | What is the effect of rotation of the earth on the acceleration due to gravity?.... | 5:29 | 1 | |
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| 2024-05-10 | Why does a body weigh more at the poles than at the equator?.... | 3:43 | 1 | |
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| 2024-05-10 | What is the apparent weight of an astronaut in a satellite revolving around the earth?.... | 3:50 | 1 | |
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| 2024-05-10 | What should be the angular speed with which the earth has to rotate on its axis so that a person.... | 6:33 | 2 | |
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| 2024-05-10 | Why is it not possible to place an artificial satellite in an orbit such that it is always visib.... | 1:48 | 1 | |
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| 2024-05-10 | How far from the earth does the gravitational potential energy due to earth become zero?.... | 2:07 | 1 | |
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| 2024-05-10 | Write any two applications of Newton's law of gravitation..... | 1:59 | 1 | |
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| 2024-05-10 | What is the value of \(G\) at the centre of the earth?.... | 2:39 | 1 | |
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| 2024-05-10 | Assertion (A): Gravitational potential is constant everywhere inside a spherical shell.
Reason (.... | 3:08 | 0 | |
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| 2024-05-10 | Two-point masses having mass \(m\) and \(2 m\) are placed at distance \(d\). The point on the li.... | 6:11 | 1 | |
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| 2024-05-10 | Assertion (A): Angular momentum of a satellite about a planet is constant.
Reason (R): Gravitati.... | 2:55 | 1 | |
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| 2024-05-10 | An artificial satellite revolves around a planet for which gravitational force \((F)\) varies wi.... | 3:20 | 0 | |
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| 2024-05-10 | As we go from the equator to the poles, value of ' \(g\) '.... | 4:26 | 3 | |
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| 2024-05-10 | The minimum and maximum distances of a planet revolving around sun are \(r\) and \(R\). If the m.... | 6:00 | 1 | |
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| 2024-05-10 | If a satellite of mass \(400 \mathrm{~kg}\) revolves around the earth in an orbit with speed \(2.... | 3:08 | 1 | |
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| 2024-05-10 | In an orbit if the time of revolution of a satellite is \(T\), then \(P E\) is proportional to.... | 4:10 | 3 | |
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| 2024-05-10 | If the gravitational potential on the surface of earth is \(V_{0}\), then potential at a point a.... | 3:08 | 0 | |
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