Dynamics MCQ (Multiple Choice Questions) PDF Download

In elastic collisions,

1. only the total momentum of the colliding objects is conserved.
2. only the total kinetic energy is conserved.
3. both of the momentum and total kinetic energy are conserved.
4. neither momentum of the colliding bodies nor the total kinetic energy are recoverable.

Force that acts on a mass of 1 g and gives it an acceleration of 1 cms^-2 is defined as

1. 1 newton
2. 1 dyne
3. 1 pound-force
4. 1 pa-force

Einstein's mass-energy relationship states that if the mass decreases by Δm, the energy released ΔE is given by

1. ΔE = Δm × c, where "c" denotes the speed of light.
2. ΔE = Δm × c², where "c" denotes the speed of light.
3. ΔE = Δm ⁄ c, where "c" denotes the speed of light.
4. ΔE = Δm ⁄ c², where "c" denotes the speed of light.

When the work done in moving a particle round a closed loop in a field is zero, the forces in the field are called

1. Zero forces
2. Non-Conservative forces
3. Conservative forces
4. Viscous forces

Dimensions of relative density are

1. mass × length^-3
2. mass × length³
3. It has no dimensions, since it's a ratio of two densities
4. length³ × mass^-1