Physics Test 63...

A body rolls down an inclined plane. If its kinetic energy of rotation is 40% of its kinetic energy of translation, the body is a

Displacement y (in m) of a body varies with time t (in sec) as: y=−2/3  t²+16t+2. How long does the body take to come to rest?

The velocity-time graph of a moving train is depicted in the figure below. The average velocity during time OD was

An open U-tube contains mercury. When 11.2 cm of water is poured into one of the arms of the tube, how high does the mercury rise in the other arm from its initial level?

Waterfalls from a height of 500 m. What is the rise in temperature of water at the bottom if whole energy remains in the water?

Two vibrating strings of the same material, but lengths L and 2 L have radii 2 r and r, respectively. They are stretched under the same tension. Both the strings vibrate in their fundamental modes, the one of length L with frequency v₁ and the other with frequency v₂. The ratio v₁/v₂ is

A uniform cylindrical rod of mass m and length L is rotating with an angular velocity ω. The axis of rotation is perpendicular to its axis of symmetry and passes through one of its edges faces. If the room temperature increases by t and the coefficient of linear expansion is α, the change in its angular velocity is :

A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r>>R, varies as

In Young's double slit experiment the 10^th  maximum, of wavelength λ₁ is at a distance of y₁ from the central maximum. When the wavelength of the source is changed to λ₂,5^th  maximum is at a distance of y2 from its central maximum. The ratio  y₁ / y₂

The ratio of the wavelengths of the longest wavelength lines in Lyman and Balmer series of hydrogen spectrum is