Class 11th

An elastic material of Young's modulus y is subjected to a stress S. The elastic energy stored per unit volume of the material is

Which of the following is not an acidic oxide?

Angular momentum of electron in 3^rd stationary orbit of hydrogen atom is

When CaC2 reacts with H2O then, it gives

56g of CO contains (N_A) = Avagadro's No.)

A given shaped glass tube having uniform cross section is filled with water and is mounted on a rotatable shaft as shown in figure. If the tube is rotated with a constant angular velocity  $\omega$  then

The potential energy of a body of mass 3 kg on the surface of a planet is 54 joule. The escape velocity will be

Two artificial satellites of masses  $m_1$ and $m_2$ are moving with speeds $v_1$ and $v_2$ in orbits of radii $r_1$ and $r_2$ , respectively. If r₁>r₂ then which of the following statements is true

Moment of inertia of a system made from three uniform rods each of mass m and length l joined to each other, as shown in the figure about one end O and perpendicular to its plane will be

An ideal gas undergoes the process $1\to 2$ as shown in the figure, the heat supplied and work done in the process is $∆Q$ and $∆W$ respectively. The ratio $∆Q:∆W$  is