Volume 1

Assertion : Angular momentum of a planet is constant about any point Reason : For acting on the planet is a central force. Assertion : Angular momentum of a planet is constant about any point Reason : For acting on the planet is a central force. September 18, 2020 Category: Arihant Physics by D.C Pandey [...]

Assertion : Four point masses each of mass m are placed at points 1, 2, 3 and 6 of a regular hexagon of side a. Then the gravitational field at the centre of hexagon is Gm/a^2 Reason : The field strength due to masses at 3 and 6 are cancelled out. 2 3 and 6 [...]

Assertion : The centre of semicircular ring of mass m and radius R is the origin O. The potential at origin is −Gm/R Reason : The gravitational field strength is towards Y-axis. Assertion : The centre of semicircular ring of mass m and radius R is the origin O. The potential at origin is −Gm/R [...]

Assertion : Gravitational force between two masses in air is F. If they are immersed in water, force will remain F Reason : Gravitational force does not depend on the medium between the masses. Assertion : Gravitational force between two masses in air is F. If they are immersed in water force will remain F [...]

Assertion : If gravitational potential at some point is zero, then gravitational field strength at that point will also be zero. Reason : Except at infinity gravitational potential due to a system of point masses at some finite distance can’t be zero. Assertion : If gravitational potential at some point is zero then gravitational field [...]

An air bubble of radius 1mm is formed inside water at a depth 10m below free surface (where air pressure is 10^5Nm^2). The pressure inside the bubble is – (Surface tension of water = 2×10^–7N/m) An air bubble of radius 1mm is formed inside water at a depth 10m below free surface (where air pressure [...]

A metal sphere connected by a string is dipped in a liquid of density ρ as shown in figure. The pressure at the bottom of the vessel will be, (p0=atmospheric pressure ) (p0=atmospheric pressure ) A metal sphere connected by a string is dipped in a liquid of density ρ as shown in figure. The [...]

The pressure of the gas in a cylindrical chamber is P0. The vertical force exerted by the gas on its hemispherical end is The pressure of the gas in a cylindrical chamber is P0. The vertical force exerted by the gas on its hemispherical end is September 18, 2020 Category: Arihant Physics by D.C Pandey [...]

An iron block is on a boat which floats in a pond. The block is thrown into the water. The level of water in the pond will be An iron block is on a boat which floats in a pond. The block is thrown into the water. The level of water in the pond will [...]

A solid shell loses half its weight in water. Relative density of shell is 5. What fraction of its volume is hollow? A solid shell loses half its weight in water. Relative density of shell is 5. What fraction of its volume is hollow? September 18, 2020 Category: Arihant Physics by D.C Pandey , Chapter [...]