Exams › SSC CGL (Prelims) › GK › General Science
34 questions with worked solutions.
Q1. Who published the logistic equation model of population growth in 1838?
Answer: Pierre Francois Verhulst
Pierre Francois Verhulst published the logistic equation model of population growth in 1838. The logistic model describes population growth with a limiting carrying capacity.
Answer: small intestine
The small intestine is the longest part of the digestive canal in mammals, including lions, cows, and humans. It is responsible for most digestion and nutrient absorption.
Answer: Antoine Lavoisier
Antoine Lavoisier established that combustion is a reaction with oxygen and rejected the phlogiston theory. This made him a key figure in modern chemistry. Therefore, the correct answer is Antoine Lavoisier.
Q4. Which of the following is NOT a primary color?
Answer: Green
Red, blue, and yellow are primary colors in the traditional color model. Green is a secondary color, so it is not a primary color.
Q5. Which of the following is a renewable source of energy?
Answer: Wind
Wind is a renewable source of energy because it is naturally replenished. Coal, petroleum, and natural gas are fossil fuels and are non-renewable.
Q6. Which among the following gases is responsible for the greenhouse effect?
Answer: Carbon Dioxide
Carbon dioxide is a major greenhouse gas that traps heat in the Earth's atmosphere and contributes to the greenhouse effect. The other listed gases are not primary greenhouse gases in this context.
Q7. Which of the following is used to measure blood pressure?
Answer: Sphygmomanometer
A sphygmomanometer is the instrument used to measure blood pressure. A thermometer measures temperature, a stethoscope is used to listen to internal body sounds, and a hygrometer measures humidity.
Q8. Which of the following pairs is not correctly matched?
Answer: Edison – Theory of Gravitation
Einstein is associated with the Theory of Relativity, Newton with the Laws of Motion, and Darwin with the Theory of Evolution. Edison is known for inventions such as the electric bulb, not the Theory of Gravitation.
Q9. Which instrument is used to measure atmospheric pressure?
Answer: Barometer
A barometer is used to measure atmospheric pressure. The other instruments measure temperature, humidity, and wind speed respectively.
Q10. Which gas is filled in balloons to make them float?
Answer: Helium
Helium is lighter than air, so balloons filled with it float. It is also non-flammable, which makes it safer than hydrogen.
Q11. Who discovered penicillin?
Answer: Alexander Fleming
Penicillin was discovered by Alexander Fleming in 1928. It was the first widely used antibiotic.
Q12. Which gas is used for the purification of water?
Answer: Chlorine
Chlorine is used to disinfect water by killing harmful microorganisms. It is a standard agent in water purification and treatment plants.
Q13. Who discovered the law of gravitation?
Answer: Newton
Sir Isaac Newton formulated the law of universal gravitation. He explained the force of attraction between any two masses.
Q14. What is the boiling point of water at standard atmospheric pressure?
Answer: 100°C
At standard atmospheric pressure, pure water boils at 100°C. This is a basic physical property of water.
Q15. Which gas do plants absorb from the atmosphere for photosynthesis?
Answer: Carbon Dioxide
Plants absorb carbon dioxide from the atmosphere during photosynthesis. They use it, along with water and sunlight, to prepare glucose and release oxygen.
Q16. Which part of the human body is affected by pneumonia?
Answer: Lungs
Pneumonia is an infection that inflames the air sacs in the lungs. Therefore, the lungs are the affected organ.
Q17. Which instrument is used to measure temperature?
Answer: Thermometer
A thermometer is used to measure temperature. A barometer measures pressure, an ammeter measures current, and an anemometer measures wind speed.
Q18. Which element is used in the filament of an electric bulb?
Answer: Tungsten
Tungsten is used in electric bulb filaments because it has a very high melting point and can glow without melting quickly. That makes it suitable for incandescent bulbs.
Q19. Which is the smallest unit of life?
Answer: Cell
The cell is the smallest structural and functional unit of life. Tissues, organs, and organ systems are all made of cells.
Q20. Which metal is liquid at room temperature?
Answer: Mercury
Mercury is the only metal that is liquid at room temperature. Iron, copper, and silver are solids under normal conditions.
Q21. What is the chemical formula for water?
Answer: H2O
Water is composed of two hydrogen atoms and one oxygen atom, so its chemical formula is H2O. The other options represent carbon dioxide, common salt, and oxygen gas.
Q22. Which Indian city is home to the headquarters of ISRO?
Answer: Bengaluru
The headquarters of ISRO is located in Bengaluru, Karnataka. ISRO is India’s national space agency.
Q23. Which is the hardest natural substance found on Earth?
Answer: Diamond
Diamond is the hardest naturally occurring substance on Earth. It ranks highest on the Mohs scale of hardness among natural materials.
Q24. Which planet is known as the Red Planet?
Answer: Mars
Mars is called the Red Planet because of the reddish appearance of its surface due to iron oxide. Hence, the correct answer is Mars.
Q25. Which planet is the largest in our solar system?
Answer: Jupiter
Jupiter is the largest planet in our solar system by both mass and volume. It is a gas giant and is much larger than the other planets.
Q26. Which organ controls all the functions of the human body?
Answer: Brain
The brain is the control center of the human body. It coordinates body functions by processing information and sending signals through the nervous system.
Q27. Which part of the cell contains genetic material?
Answer: Nucleus
The nucleus contains the cell's genetic material, mainly DNA. It acts as the control center of the cell.
Q28. What is the boiling point of water at sea level?
Answer: 100°C
At sea level, the atmospheric pressure is about 1 atm, and pure water boils at 100°C. This is the standard boiling point of water.
Q29. Which natural satellite orbits the Earth?
Answer: Moon
The Moon is Earth's natural satellite and revolves around the Earth. The other options are planets or a star.
Q30. Which metal is most abundant in the Earth's crust?
Answer: Aluminium
Aluminium is the most abundant metal in the Earth's crust. Although iron is very common, aluminium occurs in larger proportion as a metal in crustal rocks.
Q31. Which planet has the most number of moons?
Answer: Saturn
Saturn has the highest number of known moons among the options given. Although Jupiter also has many moons, Saturn currently has the most known moons.
Q32. Which vitamin is known to help with vision?
Answer: Vitamin A
Vitamin A is essential for normal vision, especially in low light. A deficiency can lead to night blindness and other eye problems.
Q33. Which element is essential for the formation of proteins?
Answer: Nitrogen
Proteins contain nitrogen because they are made of amino acids, which have amino groups. Nitrogen is therefore essential for protein formation.
Q34. Which of the following planets is known as the 'Red Planet'?
Answer: Mars
Mars is called the Red Planet because of its reddish color, which is due to iron oxide on its surface. It is the fourth planet from the Sun.