Science – MCQ – GK Questions

Q: Which blood vessel carries oxygenated blood from the heart to the body?

Aorta – The aorta is the main artery carrying oxygen-rich blood from the left ventricle to systemic circulation. Pulmonary artery carries deoxygenated blood to lungs. Critical for understanding human physiology. [[NCERT Biology Class 11]]

Q: The rate of change of velocity is called:

Acceleration – Acceleration (a = Δv/Δt) measures how quickly velocity changes. It's a vector quantity with SI unit m/s². Negative acceleration is deceleration. Fundamental in kinematics for physics exams. [[NCERT Physics Class 9]]

Q: Solar energy is converted into electrical energy using:

Photovoltaic cells – Photovoltaic (PV) cells in solar panels convert sunlight directly into electricity via the photovoltaic effect. This clean energy technology is promoted under India's National Solar Mission. [[MNRE Reports, NCERT Geography Class 11]]

Q: Which metal is liquid at room temperature?

Mercury – Mercury (Hg) is the only metal liquid at standard room temperature (25°C) due to weak metallic bonding. It's used in thermometers, barometers, and electrical switches. Bromine is the only non-metal liquid at room temperature. [[NCERT Chemistry Class 10]]

Q: Which disease is caused by the deficiency of Vitamin C?

Scurvy – Scurvy results from Vitamin C deficiency, causing weakened collagen synthesis, leading to bleeding gums, joint pain, and poor wound healing. Citrus fruits are rich sources of Vitamin C. Important for health-related exam questions. [[NCERT Biology Class 11]]

Q: Sound waves cannot travel through:

Vacuum – Sound requires a medium (solid, liquid, or gas) to propagate as mechanical waves. In vacuum, there are no particles to vibrate, so sound cannot travel. This explains why space is silent. [[NCERT Physics Class 9]]

Q: Which of the following is a strong acid?

Hydrochloric Acid – HCl completely dissociates in water into H⁺ and Cl⁻ ions, making it a strong acid. Weak acids like acetic acid only partially dissociate. Strong acids are highly corrosive and used in industrial processes. [[NCERT Chemistry Class 10]]

Q: Which part of the human brain is responsible for maintaining balance and posture?

Cerebellum – The cerebellum, located at the back of the brain, coordinates voluntary movements, maintains posture, and ensures balance. It receives sensory input and fine-tunes motor activities. [[NCERT Biology Class 11]]