PART - 1 CH - 1 Units and Measurements — Physics STD 11 Science — Question

A body of mass 2kg initially at rest moves under the action of an applied horizontal force of 7N on a table with coefficient of kinetic friction = 0.1. Compute the: Work done by friction in 10 s.

Which quantity does not change during change of state?

Is the existence of a dimensionless and unitless physical quantity possible?

Underline the correct alternative: In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/ total linear momentum/ total energy of the system of two bodies.

A stone, when thrown on a glass window, smashes the window pane to pieces. But a bullet fired from a gun passes through making a hole. Why?

A rubber balloon is given a charge Q distributed uniformly over its surface. Is the field inside the balloon zero everywhere if the balloon does not have a spherical surface?

In an elastic collision, relative velocity of approach between two bodies is always ______to relative velocity of separation.

A particle is in linear simple harmonic motion between two points, A and B, 10cm apart. Take the direction from A to B as the positive direction and give the signs of velocity, acceleration and force on the particle when it is:At the mid-point of AB going towards A.

Can mechanical work be completely converted into heat? Is reverse also possible?