Certainly! Here are 60 sample objective questions with their answers:
1. What is the chemical symbol for sodium?
a) S
b) So
c) Na
d) N
Answer: c) Na
2. Which gas is most abundant in the Earth’s atmosphere?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Argon
Answer: b) Nitrogen
3. What is the main function of the mitochondria in a cell?
a) Protein synthesis
b) Energy production
c) Storage of genetic material
d) Cell division
Answer: b) Energy production
4. Which of the following is a greenhouse gas?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Helium
Answer: c) Carbon dioxide
5. The process of converting a liquid into a gas is called:
a) Condensation
b) Evaporation
c) Freezing
d) Sublimation
Answer: b) Evaporation
6. Which part of the plant is responsible for absorbing water and nutrients from the soil?
a) Leaves
b) Flowers
c) Roots
d) Stems
Answer: c) Roots
7. What is the SI unit of electric current?
a) Volt
b) Ampere
c) Watt
d) Ohm
Answer: b) Ampere
8. Which planet is known as the “Blue Planet” due to its abundant water?
a) Venus
b) Earth
c) Mars
d) Neptune
Answer: b) Earth
9. What is the formula for calculating speed?
a) Speed = Distance × Time
b) Speed = Distance ÷ Time
c) Speed = Time ÷ Distance
d) Speed = Time × Distance
Answer: b) Speed = Distance ÷ Time
10. The process of changing a solid into a liquid is known as:
a) Sublimation
b) Melting
c) Condensation
d) Evaporation
Answer: b) Melting
11. Which of the following is a herbivore?
a) Lion
b) Snake
c) Elephant
d) Hawk
Answer: c) Elephant
12. What is the largest planet in our solar system?
a) Venus
b) Jupiter
c) Mars
d) Saturn
Answer: b) Jupiter
13. What type of energy is stored in the nucleus of an atom?
a) Kinetic energy
b) Nuclear energy
c) Potential energy
d) Thermal energy
Answer: b) Nuclear energy
14. What is the process by which plants make their own food using sunlight?
a) Photosynthesis
b) Respiration
c) Digestion
d) Transpiration
Answer: a) Photosynthesis
15. The process of breaking down rocks into smaller particles by natural forces is called:
a) Erosion
b) Weathering
c) Sedimentation
d) Deposition
Answer: b) Weathering
16. Which of the following is an example of a chemical change?
a) Melting ice
b) Boiling water
c) Burning wood
d) Cutting paper
Answer: c) Burning wood
17. Which component of blood is responsible for carrying oxygen throughout the body?
a) Platelets
b) White blood cells
c) Red blood cells
d) Plasma
Answer: c) Red blood cells
18. What is the process by which a gas turns into a liquid?
a) Evaporation
b) Condensation
c) Sublimation
d) Melting
Answer: b) Condensation
19. What is the formula for calculating density?
a) Density = Mass × Volume
b) Density = Volume ÷ Mass
c) Density = Mass ÷ Volume
d) Density = Mass + Volume
Answer: c) Density = Mass ÷ Volume
20. Which of the following is NOT a component of the water cycle?
a) Precipitation
b) Evaporation
c) Condensation
d) Filtration
Answer: d) Filtration
21. What type of energy is possessed by a moving car?
a) Kinetic energy
b) Potential energy
c) Mechanical energy
d) Thermal energy
Answer: a) Kinetic energy
22. The process of converting sunlight into electrical energy using solar panels is called:
a) Photosynthesis
b) Solarization
c) Solar power
d) Photovoltaic effect
Answer: d) Photovoltaic effect
23. What is the chemical formula for table salt (sodium chloride)?
a) Na2CO3
b) H2O
c) NaCl
d) CO2
Answer: c) NaCl
24. Which of the following is NOT a type of simple machine?
a) Lever
b) Pulley
c) Wheel
d) Inclined plane
Answer: c) Wheel
25. The process by which liquid water changes into water vapor is called:
a) Evaporation
b) Melting
c) Condensation
d) Sublimation
Answer: a) Evaporation
26. What is the primary function of the respiratory system in the human body?
a) Pumping blood
b) Digesting food
c) Exchanging gases
d) Filtering waste
Answer: c) Exchanging gases
27. Which of the following is a natural satellite of the Earth?
a) Mars
b) Moon
c) Venus
d) Jupiter
Answer: b) Moon
28. What gas do plants release during photosynthesis?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer: b) Oxygen
29. What is the process of water vapor turning into liquid water called?
a) Evaporation
b) Condensation
c) Sublimation
d) Precipitation
Answer: b) Condensation
30. The process of converting a gas directly into a solid without passing through the liquid state is called:
a) Condensation
b) Evaporation
c) Freezing
d) Sublimation
Answer: d) Sublimation
31. What is the chemical symbol for oxygen?
a) O
b) Ox
c) C
d) O2
Answer: a) O
32. Which of the following is NOT a type of energy?
a) Mechanical energy
b) Thermal energy
c) Electrical energy
d) Atmospheric energy
Answer: d) Atmospheric energy
33. What is the process by which a liquid changes into a solid?
a) Sublimation
b) Melting
c) Freezing
d) Condensation
Answer: c) Freezing
34. What is the SI unit of electric resistance?
a) Watt
b) Ampere
c) Ohm
d) Volt
Answer: c) Ohm
35. Which of the following is the largest organ in the human body?
a) Liver
b) Heart
c) Brain
d) Skin
Answer: d) Skin
36. Which type of energy is stored in the food we eat?
a) Nuclear energy
b) Kinetic energy
c) Mechanical energy
d) Chemical energy
Answer: d) Chemical energy
37. The process of water vapor falling to the ground as rain, snow, sleet, or hail is known as:
a) Evaporation
b) Precipitation
c) Condensation
d) Sublimation
Answer: b) Precipitation
38. Which of the following is an example of a conductor of electricity?
a) Rubber
b) Wood
c) Copper
d) Glass
Answer: c) Copper
39. What is the SI unit of frequency?
a) Watt
b) Hertz
c) Ohm
d) Volt
Answer: b) Hertz
40. Which planet is known as the “Red Planet”?
a) Venus
b) Mars
c) Jupiter
d) Saturn
Answer: b) Mars
41. The process of converting sugar into energy in living organisms is called:
a) Respiration
b) Photosynthesis
c) Fermentation
d) Digestion
Answer: a) Respiration
42. Which of the following is a characteristic of acids?
a) Turns blue litmus paper red
b) Turns red litmus paper blue
c) Bitter taste
d) Slippery texture
Answer: a) Turns blue litmus paper red
43. What is the chemical formula for carbon dioxide?
a) CO
b) CO2
c) H2O
d) CH4
Answer: b) CO2
44. The process by which plants lose water vapor through tiny pores on their leaves is called:
a) Transpiration
b) Evaporation
c) Condensation
d) Precipitation
Answer: a) Transpiration
45. Which of the following is a carnivore?
a) Rabbit
b) Lion
c) Cow
d) Elephant
Answer: b) Lion
46. What type of lens is thicker at the center than at the edges and converges light rays?
a) Convex lens
b) Concave lens
c) Plano-concave lens
d) Plano-convex lens
Answer: a) Convex lens
47. What is the process of converting a solid directly into a gas without passing through the liquid state?
a) Melting
b) Evaporation
c) Sublimation
d) Condensation
Answer: c) Sublimation
48. The process of changing a liquid into a gas at the surface of a liquid is called:
a) Evaporation
b) Melting
c) Freezing
d) Boiling
Answer: a) Evaporation
49. Which of the following is a unit of pressure?
a) Kilogram
b) Pascal
c) Newton
d) Joule
Answer: b) Pascal
50. Which organ is responsible for filtering waste from the blood and producing urine?
a) Liver
b) Lungs
c) Kidneys
d) Stomach
Answer: c) Kidneys
51. What is the main function of chlorophyll in plants during photosynthesis?
a) Absorb water
b) Absorb carbon dioxide
c) Absorb sunlight
d) Absorb nutrients
Answer: c) Absorb sunlight
52. The process of converting a solid into a liquid is called:
a) Freezing
b) Condensation
c) Evaporation
d) Melting
Answer: d) Melting
53. Which of the following is a renewable energy source?
a) Natural gas
b) Coal
c) Solar power
d) Petroleum
Answer: c) Solar power
54. What is the SI unit of work and energy?
a) Watt
b) Joule
c) Ampere
d) Newton
Answer: b) Joule
55. What gas do humans inhale during respiration?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Helium
Answer: b) Oxygen
56. Which of the following is NOT a phase of matter?
a) Solid
b) Liquid
c) Gas
d) Energy
Answer: d) Energy
57. The process of removing salt and other impurities from seawater to make it suitable for drinking is called:
a) Distillation
b) Filtration
c) Evaporation
d) Condensation
Answer: a) Distillation
58. Which of the following is a metal that is a liquid at room temperature?
a) Copper
b) Aluminum
c) Mercury
d) Iron
Answer: c) Mercury
59. What is the chemical formula for water?
a) CO2
b) H2O
c) O2
d) NaCl
Answer: b) H2O60. The process by which plants take in carbon dioxide and release oxygen during the day is called:
a) Respiration
b) Photosynthesis
c) Transpiration
d) Fermentation
Answer: b) Photosynthesis
