If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

11.

A ball, P, is released from the roof of a building at the same time as another ball, Q, is thrown vertically upward from the base of the building. Which of the following statements is correct?

A.

The acceleration of P is greater than that of Q and both are in the same direction.

B.

The acceleration of P is less than that of Q and both are in the same direction.

C.

The acceleration of P is equal to that of Q and both are in the same direction.

D.

The acceleration of P is equal to that of Q and are in opposite directions.

The correct statement is:
The acceleration of P is equal to that of Q and both are in the same direction.
When ball P is released from the roof of the building, it falls freely under the influence of gravity. Similarly, when ball Q is thrown vertically upward, it initially moves upward but is also under the influence of gravity, which acts to slow it down and eventually makes it fall back down.
Both balls, P and Q, are subjected to the same acceleration due to gravity (assuming no other forces are acting on them), which is approximately 9.8 m/s² near the surface of the Earth, and this acceleration acts in the downward direction. Therefore, the acceleration of P is equal to the acceleration of Q, and both are in the same direction, which is downward.

12.

The colours of the visible light region of the electromagnetic spectrum that have the shortest and longest wavelengths respectively are

A.

red and blue.

B.

indigo and violet

C.

violet and red.

D.

yellow and blue.

The colors of the visible light spectrum with the shortest and longest wavelengths respectively are:

Violet and red.

Violet light has the shortest wavelength among visible colors, while red light has the longest wavelength. The visible light spectrum, in order of increasing wavelength, goes from violet to blue, green, yellow, orange, and finally red.

13.

The property of a body that determines the direction of heat flow when the body is in contact with another body is the

A.

Heat capacity

B.

mass

C.

Power

D.

Temperature

The property of a body that determines the direction of heat flow when the body is in contact with another body is the temperature.

Heat naturally flows from a body at a higher temperature to a body at a lower temperature. Temperature is a measure of the average kinetic energy of the particles in a substance. When two objects at different temperatures come into contact, heat energy tends to transfer from the warmer object to the cooler one until they reach thermal equilibrium (they are at the same temperature). This is known as the second law of thermodynamics, which describes the direction of heat flow.

14.

The sagging of overhead electrical wires is caused by

A.

B.

rough handling.

C.

gravitational attraction

D.

Linear expansion

The sagging of overhead electrical wires is caused by linear expansion.

Linear expansion is the tendency of materials to expand in length when they are heated. When overhead electrical wires are heated by the sun, they expand and sag.

15.

A direct current cannot pass through a parallel plate capacitor because

A.

the plates are non-conducting.

B.

the dielectric between the plates is non-conducting.

C.

there is a leakage of charge from the plates.

D.

the plates have equal but opposite charges.