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Question 1: Which subatomic particle was the first to be discovered by J.J. Thomson in 1897?
- Neutron
- Electron
- Positron
- Proton
Answer: B. Electron
Explanation: J.J. Thomson discovered the electron while experimenting with cathode ray tubes. This discovery fundamentally changed our understanding of atomic structure, proving that atoms were not indivisible as previously thought by scientists.
Question 2: What is the primary chemical component of the mineral known as corundum?
- Magnesium silicate
- Aluminum oxide
- Calcium carbonate
- Silicon dioxide
Answer: B. Aluminum oxide
Explanation: Corundum is a crystalline form of aluminum oxide. It is notable for its extreme hardness, ranking 9 on the Mohs scale, and serves as the base mineral for rubies and sapphires.
Question 3: Which programming language was the first to implement the concept of object-oriented programming?
- Java
- C++
- Simula
- Smalltalk
Answer: C. Simula
Explanation: Simula, developed in the 1960s at the Norwegian Computing Center, introduced key concepts like classes, objects, inheritance, and dynamic binding, laying the essential groundwork for all modern object-oriented programming languages today.
Question 4: In human anatomy, which bone is the longest and strongest in the entire body?
- Tibia
- Fibula
- Humerus
- Femur
Answer: D. Femur
Explanation: The femur, or thigh bone, is the longest and strongest bone in the human skeleton. It supports the weight of the body and facilitates movement by connecting the hip to the knee.
Question 5: What is the name of the process by which a star collapses into a black hole?
- Nuclear fusion
- Gravitational collapse
- Supernova
- Nebular contraction
Answer: B. Gravitational collapse
Explanation: Gravitational collapse occurs when the internal pressure of a massive star can no longer counteract its own gravity, causing the core to shrink until it forms a singularity or black hole.
Question 6: Which law of thermodynamics states that entropy of a system approaches a constant value as temperature reaches absolute zero?
- First Law
- Third Law
- Second Law
- Zeroth Law
Answer: B. Third Law
Explanation: The Third Law of Thermodynamics states that the entropy of a perfect crystal at absolute zero is exactly zero, providing a baseline for calculating absolute entropy values for various chemical substances.
Question 7: What is the primary function of the Golgi apparatus in a eukaryotic cell?
- Protein modification and packaging
- Energy production
- DNA replication
- Protein synthesis
Answer: A. Protein modification and packaging
Explanation: The Golgi apparatus acts as the cell's post office, receiving proteins from the endoplasmic reticulum, modifying them, and packaging them into vesicles for transport to their final destinations within or outside.
Question 8: Which network protocol is primarily used for secure remote login and command execution?
- FTP
- SSH
- HTTP
- Telnet
Answer: B. SSH
Explanation: Secure Shell (SSH) provides a secure, encrypted channel for accessing a remote computer over an unsecured network, effectively replacing older, insecure protocols like Telnet which transmitted data in plain text format.
Question 9: What is the term for the phenomenon where light bends as it passes through different media?
- Reflection
- Diffraction
- Refraction
- Dispersion
Answer: C. Refraction
Explanation: Refraction is the change in direction of a wave passing from one medium to another caused by its change in speed. This principle is fundamental to lenses, prisms, and human vision.
Question 10: Which element has the highest melting point of all pure chemical elements?
- Carbon
- Osmium
- Tungsten
- Tantalum
Answer: C. Tungsten
Explanation: Tungsten has the highest melting point of any metal, at approximately 3,422 degrees Celsius. Its high heat resistance makes it ideal for use in light bulb filaments and high-temperature industrial applications.