7th class cdf

A two dimensional motion of an object along a circular path is ----

• Circular motion

• Straight line motion

• Uniforms motion

• All the above

------can be described as motion of an object in a circle at constant speed.

• Non uniforms circular motion

• Uniform circular motion

• Linear motion

• All the above

When a particle moving on a circumference of circle line joining at any postion of particle and centre of circle is called -----

• Circular motion

• Radius vector

• Uniform motion

• All the above

Unit of angular displacement is ----

• Radian

• Meter

• Centimeter

• All the above

Dimensional formula of angular displacement -----

• No dimensional formula

• MLT

• M2LT

• All the above

When a particle complete one revolution angular displacement theta=

• 360° or 2π

• 180°

• 90°

• 360° or π

When a body is in motion in fluid, there develops opposing force. This force is called ---

• Viscous drag

• Friction

• Contact force

• Normal reaction

According to ------- total linear momentum of a system remains constant.

• Law of conservation of mass

• Law of conservation of energy

• Law of conservation of momentum

• All the above

------- law states that " For every action there exists equal reaction ".

• Newton's II

• Newton I

• Newton IV

• Newton III

When two bodies stick together after collision moving with common velocity V then V= ----

• M1u1+ m2u2/ m1+m2

• M1u1-m2u2/m1+m2

• Bothe 1&2

• M1u1