SCIENCE PART 1 ( ADRE)
Here are 20 science multiple-choice questions (MCQs) with their answers:
1 **What is the powerhouse of the cell?**
- A) Nucleus
- B) Mitochondria
- C) Ribosome
- D) Endoplasmic reticulum
- **Answer: B) Mitochondria**
2. **What is the chemical symbol for gold?**
- A) Au
- B) Ag
- C) Go
- D) Gd
- **Answer: A) Au**
3. **What is the speed of light in a vacuum?**
- A) Approximately 300,000 km/s
- B) Approximately 150,000 km/s
- C) Approximately 400,000 km/s
- D) Approximately 200,000 km/s
- **Answer: A) Approximately 300,000 km/s**
4. **What type of bond is formed when electrons are shared between atoms?**
- A) Ionic bond
- B) Covalent bond
- C) Metallic bond
- D) Hydrogen bond
- **Answer: B) Covalent bond**
5. **Which of the following is not a type of rock?**
- A) Igneous
- B) Sedimentary
- C) Metamorphic
- D) Synthetic
- **Answer: D) Synthetic**
6. **What is the formula for photosynthesis?**
- A) $$ 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2 $$
- B) $$ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O $$
- C) $$ 2H_2 + O_2 \rightarrow 2H_2O $$
- D) $$ CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O $$
- **Answer: A) $$ 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2 $$**
7 **Which element has the highest electrical conductivity?**
- A) Silver
- B) Copper
- C) Gold
- D) Aluminum
- **Answer: A) Silver**
8 **What is the main gas found in the sun?**
- A) Helium
- B) Hydrogen
- C) Oxygen
- D) Nitrogen
- **Answer: B) Hydrogen**
9. **What is the pH level of pure water?**
- A) 5
- B) 7
- C) 9
- D) 11
- **Answer: B) 7**
10. **Which vitamin is produced by the human skin in response to sunlight?**
- A) Vitamin A
- B) Vitamin B
- C) Vitamin C
- D) Vitamin D
- **Answer: D) Vitamin D**
11 **What is the hardest natural substance on Earth?**
- A) Diamond
- B) Quartz
- C) Topaz
- D) Sapphire
- **Answer: A) Diamond**
12. **Which of these is a mammal?**
- A) Shark
- B) Dolphin
- C) Crocodile
- D) Octopus
- **Answer: B) Dolphin**
13. **What is the term for a substance that speeds up a chemical reaction without being consumed?**
- A) Reactant
- B) Catalyst
- C) Product
- D) Inhibitor
- **Answer: B) Catalyst**
14. **Which layer of the Earth is liquid?**
- A) Crust
- B) Mantle
- C) Outer core
- D) Inner core
- **Answer: C) Outer core**
15. **Which gas is most responsible for the greenhouse effect on Earth?**
- A) Methane
- B) Nitrous oxide
- C) Carbon dioxide
- D) Ozone
- **Answer: C) Carbon dioxide**
16. **What is the main function of white blood cells?**
- A) Transport oxygen
- B) Clot blood
- C) Fight infection
- D) Carry nutrients
- **Answer: C) Fight infection**
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