Trial UPS

Which of the following is FALSE about dimensional analysis?

• Technique or method in which the physical quantity can be expressed in terms of combination of basic quantities.

• A measure of physical quantity (without numerical values)

• Dimension on the left hand side of an equation (L.H.S.) equals to the dimension on the right hand side of an equation (R.H.S)

• Dimensions can be added or subtracted

Answer explanation

What is the dimension of π?

• L⁻¹T

• ML⁻¹

• ML⁻²

• 1

Which of the following quantities is a scalar quantity?

• Displacement

• Work

• Velocity

• Force

How do you calculate average velocity?

• A time interval divided by a change of displacement

• A time interval multiply by a change of displacement

• A change of displacement divided by a time interval

• Addition of a time interval and a change of displacement.

The rate of change of velocity is called...

• Acceleration

• Force

• Speed

• Distance

Which of the following represents the displacement?

• area under acceleration-time graph

• area under velocity-time graph

• gradient under acceleration-time graph

• gradient under velocity-time graph

A projectile is launched from the ground. Assuming that air resistance is negligible, which of the following statements is FALSE?

• The motion involves constant velocity along the horizontal and constant acceleration along the vertical.

• The vertical component of the velocity along the motion is constant.

• The horizontal component of the velocity along the motion is constant.

• The path made by the projectile is a parabolic.

FIGURE shows the positions of an object undergoes projectile motion at different time, t. At which point, one of velocity’s components of the object is zero?

• Point P

• Point Q

• Point R

• Point S

Linear momentum is a

• Scalar quantity

• Force

• product of mass and acceleration

• product of velocity and mass

The principle of conservation of linear momentum states that

• the total initial momentum of all objects interacting with one another is not equal the total final momentum

• the total initial momentum of all objects interacting with one another is equal to the total final momentum.

• the total initial momentum of all objects interacting with one another is more than the total final momentum

• the total momentum of all objects interacting with one another is always remains not conserved