AFCAT Science and Technology 2

Question 1

Which phenomenon explains why the sky appears blue during the day?

Accepted Answer

Rayleigh scattering of sunlight by atmospheric molecules

Answer

Rayleigh scattering causes shorter blue wavelengths to scatter more than longer red wavelengths, making the sky appear blue.

Question 2

What is the primary fuel used in India's PSLV (Polar Satellite Launch Vehicle)?

Accepted Answer

Solid propellant (HTPB) in core stages with liquid engines

Answer

PSLV uses solid propellant (HTPB-based) in its first and third stages, with liquid engines in the second and fourth stages.

Question 3

Which law states that the pressure of a fixed amount of gas at constant volume is directly proportional to its absolute temperature?

Accepted Answer

Gay-Lussac's Law

Answer

Gay-Lussac's Law (P ∝ T at constant volume) describes the relationship between pressure and absolute temperature for a fixed gas sample.

Question 4

What does the term 'RADAR' stand for?

Accepted Answer

Radio Detection And Ranging

Answer

RADAR stands for Radio Detection And Ranging, a system that uses radio waves to detect and locate objects.

Question 5

Which type of electromagnetic radiation has the highest frequency?

Accepted Answer

Gamma rays

Answer

Gamma rays have the highest frequency (and shortest wavelength) in the electromagnetic spectrum.

(AFCAT) Air Force Common Admission Test Practice Test