DSST Physical Sciences 2

Question 1

Which law states that the pressure of a gas is inversely proportional to its volume at constant temperature?

Accepted Answer

Boyle's Law

Answer

Boyle's Law states that P × V = constant when temperature is held fixed.

Question 2

What type of radiation has the greatest penetrating power?

Accepted Answer

Gamma rays

Answer

Gamma rays are high-energy electromagnetic radiation that can penetrate thick shielding materials.

Question 3

An object with a mass of 10 kg accelerates at 3 m/s². What is the net force acting on it?

Accepted Answer

30 N

Answer

Newton's second law: F = ma = 10 kg × 3 m/s² = 30 N.

Question 4

What is the oxidation state of sulfur in H₂SO₄?

Accepted Answer

+6

Answer

In H₂SO₄, hydrogen is +1 (×2) and oxygen is −2 (×4), so sulfur must be +6 to balance.

Question 5

Which phenomenon explains why the sky appears blue?

Accepted Answer

Rayleigh scattering

Answer

Rayleigh scattering causes shorter (blue) wavelengths of sunlight to scatter more than longer wavelengths.

DSST - DANTES Subject Standardized Tests Practice Test