Basic Science

17 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 1–17 of 17

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.Rainbow is formed by?

Medium
A Reflection
B Refraction
C Scattering
D Dispersion
Light PPSC 2026

Correct Answer: D

A rainbow is formed by the dispersion of sunlight into its constituent colors as it passes through water droplets.

Q3.Electromagnetic Spectrum visible for human eye?

Medium
A 378-750 nm
B 400-800nm
C 45-850nm
D None of these
Light PPSC 2026

Correct Answer: A

The visible light spectrum for the human eye ranges approximately from 378 to 750 nanometers.

Q4.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).

Q5.Sun rays are most reflected by which color?

Easy
A Red
B Black
C Blue
D White
Light PPSC 2025

Correct Answer: D

Q6.How many classic states of matter are recognized normally?

Easy
A Two
B Three
C Four
D Five
Matter PPSC 2026

Correct Answer: C

Q7.Disorder in a system is called

Easy
A Entropy
B Conviction
C Contradiction
D None of these
Energy PPSC 2026

Correct Answer: A

Q8.If output voltage is greater than input voltage, then transformer is:

Easy
A Step up
B Step down
C Faulty
D None of these
Electricity CSS 2026

Correct Answer: A

A transformer where output voltage exceeds input voltage is called a step-up transformer.

Q9.What is the next term in the series? 11, 20, 35, 56, 83...

Medium
A (A) 108
B (B) 116
C (C) 122
D (D) None of these
Basic Scientific Concepts CSS 2024

Correct Answer: B

Correct Answer: 116.

Q10.The term "light year" refers to:

Medium
A Time that Earth takes to complete one revolution around the Sun
B Distance of Earth from the Sun at which intensity of light is maximum
C Speed of light expressed in miles per year
D None of these
Light CSS 2023

Correct Answer: D

Correct Answer: None of these.

Q11.The waves which are used by the TV remote control are:

Medium
A Infrared waves
B Radio waves
C TV waves
D None of these
Light CSS 2022

Correct Answer: A

Correct Answer: Infrared waves.

Q12.Which light is more important for photosynthesis?

Medium
A Violet light
B Red light
C Green light
D None of these
Light CSS 2022

Correct Answer: B

Correct Answer: Red light.

Q13.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).

Q14.In an inelastic collision, which of the following is NOT conserved?

Medium
A Total Momentum
B Kinetic Energy
C Total Mass
D None of these
Energy FPSC 2026

Correct Answer: B

Kinetic energy is lost to internal friction, heat, or sound in inelastic collisions (FPSC 2026).

Q15.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).

Q16.What is the main source of energy for our Earth?

Medium
A The Moon
B The Sun
C Volcanoes
D Nuclear Fusion in core
Energy FPSC 2026

Correct Answer: B

Solar radiation powers the biosphere and climate systems (FPSC 2025).

Q17.The device used to measure current in an electrical circuit is called:

Medium
A Voltmeter
B Ammeter
C Galvanometer
D Barometer
Electricity FPSC 2025

Correct Answer: B

Correct Answer: Ammeter. An ammeter is a measuring instrument used to determine the electric current in a circuit.