Class 11th

Nitrogen has is at 300° temperature. The temperature (in K) at which the rms speed of a H? molecule would be equal to the rms speed of a nitrogen molecule, is (Molar mass of N? gas 28 g)

A thin rod of mass 0.9 kg and length 1 m is suspended, at rest, from one end so that in can freely oscillate in the vertical plane. A particle of move 0.1 kg moving in a straight line with velocity 80 m/s hits the rod at its bottom most point and sticks to it (see figure). The angular speed (in rad/s) of the rod immediately after the collision will be 

Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve $$ $10\mathrm{p}\mathrm{p}\mathrm{m}$ of iron in $$ $100\mathrm{k}\mathrm{g}$ of wheat is Atomic weight : $$ $\mathrm{F}\mathrm{e}=55.85;\mathrm{S}=32.00;\mathrm{O}=16.00$

The velocity (v) and time (t) graph of a body in a straight line motion is shown in the figure. The point S is at 4.333 seconds. The total distance covered by the body in 6 s is:

A ring is hung on a nail. It can oscillate, without slipping or sliding (i) in its plane with a time period T?, and, T (ii) back and forth in a direction perpendicular to its plane, with a period T?. The ratio T?/T? will be:

The magnitude of work done by a gas that undergoes a reversible expansion along the path $ABC$ $$ shown in the figure is Pressure

In an experiment to verify Stokes law, a small spherical ball of radius r and density ρ falls under gravity through a distance h in air before entering a tank of water. If the terminal velocity of the ball inside water is same as its velocity just before entering the water surface, then the value of h is proportional to: (ignore viscosity of air)

The acceleration due to gravity on the earth's surface at the poles is g an and angular velocity of the earth about the axis passing through the pole is ω. An object is weight at the equator and at a height h above the poles by using a spring balance. If the weights are found to be same, then h is : (h << R, where R is the radius of the earth)

The first ionization energy (in $\mathrm{k}\mathrm{J}/\mathrm{m}\mathrm{o}\mathrm{l}$  $$ ) of $\mathrm{N}\mathrm{a},\mathrm{M}\mathrm{g},\mathrm{A}\mathrm{l}$ $$ and Si respectively, are :

A spaceship in space sweeps stationary interplanetary dust. As a result, its mass increases at a rate dm(t)/dt$$ =bv^2(t), where v(t)$$ its instantaneous velocity. The instantaneous acceleration of the satellite is: