Technologies

Question 1

Steam/diesel/petrol engines

Answer 1

Laws of thermodynamics

Question 2

Refrigerator

Answer 2

Laws of thermodynamics

Question 3

Aeroplane

Answer 3

Bernoulli’s principle in fluid dynamics

Question 4

Television and radio

Answer 4

Principle of communication system using electromagnetic waves

Question 5

Rocket propulsion

Answer 5

Newton’s laws of motion

Question 6

Computer

Answer 6

Digital logic

Question 7

Laser

Answer 7

Light amplification by stimulated emission of radiation

Question 8

Orbital motion of satellites

Answer 8

Kepler’s laws of planetary motion

Question 9

Electron microscope

Answer 9

Wave nature of matter (electron)

Question 10

Cyclotron

Answer 10

Electromagnetic force on charged particles

Question 11

Nuclear reactor

Answer 11

Nuclear fission

Question 12

Production of ultra-high magnetic fields

Answer 12

Superconductivity

Question 13

Electric generator/transformer

Answer 13

Faraday’s laws of electromagnetic induction

Question 14

Sonar

Answer 14

Reflection of ultrasound waves

Question 15

Hydroelectric power

Answer 15

Conversion of gravitational potential energy to electrical energy

Question 16

Pressure cooker

Answer 16

Increased boiling point of water at higher pressures

Question 17

Photocell

Answer 17

Photoelectric effect