Post Utme Physics Past Questions and Answers

Question 1136:

Which of the following features is used to minimize heat loss due to conduction in a thermo - flask?

A. The space between the two walls of the vacuum flask is evacuated
B. The vacuum flask is separated from the outer wall with corks
C. The surfaces of the vacuum flask are silvered.
D. The inner and outer walls of the flask are made of steel

Question 1137:

Which of the following quantities is a scalar quantity?

A. Electric field
B. Coulomb force
C. Electric potential
D. Acceleration due to gravity

Question 1138:

A car accelerates at \(5.0 m / s ^{2}\) for \(6 s\), it travels at the speed attained for 20s, and comes to rest after another \(4.0 s\). Calculate the average velocity of the car during the motion

A. \(25.0 m / s\)
B. \(20.0 m / s\)
C. \(1.25 m / s\)
D. \(0.16 m / s\)

Question 1139:

Which of the following quantities is equal to the area under a velocity - time graph?

A. Acceleration
B. Distance travelled
C. Average velocity of motion
D. Total time taken

Question 1140:

A \(25 N\) force pulls a \(2.0 kg\) body up a \(30^{\circ}\) inclined plane. If the force is parallel to the plane and the body moves up the plane at constant velocity, calculate the magnitude of the frictional force between the body and the plane. \([g=\) \(10 m / s ^{2}\) ]

A. \(35 N\)
B. \(25 N\)
C. \(20 N\)
D. \(15 N\)