11 Physics Unit 1, 2 & 3 EM

If the error in the measurement of radius is 2% then the error in the determination of volume of sphere will be

• 8%

• 2%

• 4%

• 6%

Which of the following pairs of physical quantities have same dimension?

• Force and power

• Torque and power

• Torque and energy

• Force and torque

If the force is proportional to square of velocity then the dimension of proportionality constant is

(^ means Power)

• [MLT°]

• [MLT^-1]

• [ML^-2T]

• [ML^-1T°]

The length of body is measured as 3.51m if the accuracy is 0.01m then the percentage error in the measurement is

• 351%

• 1%

• 0.28%

• 0.035%

Round of the following number 19.95 into 3 significant figure

• 19.9

• 20.0

• 20.1

• 19.5

Which one of the following physical quantity cannot be represent by scalar?

• Mass

• Length

• Momentum

• Magnitude of acceleration

If a particle has negative velocity and negative acceleration its speed

• Increases

• Decreases

• Remains same

• Zero

To objects are projected at angle 30° and 60° respectively with respect to the horizontal direction the range of two objects are denoted as R 30° and R 60° shows the correct relation from the following

• R 30°=R 60°

• R 30°= 4 R 60°

• R 30°=R 60°/2

• R 30°=2 R 60°

If one object is dropped vertically downward and another object is thrown horizontally from the same height then the ratio of vertical distance covered by both objects at same instant t is

• 1

• 2

• 4

• 0.5

If an object is thrown vertically up with the initial speed u from the ground then that time taken by object to return back to the ground is

• u² / 2g

• u² / g

• u / 2g

• 2u / g