Basic Science

4 questions available

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All Basic Scientific Concepts 1 Matter 1 Energy 3 Force & Motion Heat & Temperature Light 6 Sound 4 Electricity 2 Magnetism
Showing 1–4 of 4

Q1.The normal frequency of human hearing is:

Medium
A 20 HZ to 20,000 Hz
B 30 Hz to 30,000 Hz
C 40 Hz to 40,000 Hz
D None of these
Sound PPSC 2026

Correct Answer: A

Q2.A normal human ear can hear the sound of ----------frequency:

Easy
A 10HZ-10KHz
B 20HZ-20KHZ
C 30HZ-30KHZ
D 40HZ-40KHZ
Sound PPSC 2026

Correct Answer: B

The human audible frequency range is typically 20 Hz to 20,000 Hz (20 kHz).

Q3.The light-sensitive drum of a photostat photocopy machine is made of or coated with:

Medium
A Silicon
B Selenium
C Germanium
D Copper
Sound FPSC 2026

Correct Answer: B

Selenium is a photoconductor that conducts electricity only when exposed to light (FPSC 2026).

Q4.Sound waves cannot travel through which of the following?

Medium
A Water
B Air
C Steel
D Vacuum
Sound FPSC 2026

Correct Answer: D

Sound is a mechanical wave requiring a material medium to propagate (FPSC 2025).