Free GKT Science and Technology Questions and Answers — Questions and Answers
Question 1: What is the main element used in making solar panels?
- Iron
- Copper
- Silicon (Correct answer)
- Aluminium
Correct answer: Silicon
Silicon is the main element used in making solar panels due to its semiconductor properties. It efficiently converts sunlight into electricity through the photovoltaic effect. Its abundance and effectiveness make it the primary material for most photovoltaic cells.
Question 2: Which planet is known as the "Red Planet"?
- Venus
- Mars (Correct answer)
- Jupiter
- Saturn
Correct answer: Mars
Mars is known as the 'Red Planet' because of the iron oxide, or rust, prevalent on its surface. This gives the planet its distinctive reddish-orange hue. The presence of iron oxide is a key characteristic that makes Mars easily identifiable in our solar system.
Question 3: What is the unit of electric current?
- Volt
- Ohm
- Ampere (Correct answer)
- Joule
Correct answer: Ampere
The unit of electric current is the Ampere (A). It quantifies the rate of flow of electric charge through a conductor. One Ampere is defined as one Coulomb of charge passing a point in one second.
Question 4: Which was the first human-made satellite to orbit the Earth?
- Apollo 11
- Sputnik 1 (Correct answer)
- Explorer 1
- Vostok 1
Correct answer: Sputnik 1
Sputnik 1 was the first human-made satellite to orbit the Earth, launched by the Soviet Union on October 4, 1957. Its successful launch marked the beginning of the Space Age and triggered the space race. This pioneering satellite provided valuable data about the Earth's atmosphere and the challenges of spaceflight.
Question 5: What does DNA stand for?
- Deoxyribose Nuclear Acid
- Deoxyribonucleic Acid (Correct answer)
- Dimethyl Nucleic Acid
- Dimeric Nucleic Acid
Correct answer: Deoxyribonucleic Acid
DNA stands for Deoxyribonucleic Acid. It is a complex molecule that carries all the genetic information for the development, functioning, growth, and reproduction of all known organisms and many viruses. DNA is the fundamental building block of heredity.
Free GKT Science and Technology Questions and Answers
What is the main element used in making solar panels?