Physics, Astronomy & Technology Basics

Inertia is the property of matter that resists changes in its state of motion (rest or constant velocity). It's directly proportional to mass and described by Newton's First Law. Resistivity (A) is a material property, conductance (C) relates to current flow, and momentum (D) is mass × velocity, not resistance to change.

Gravitational force is directly proportional to mass (F = G×m1×m2/r²). A body with greater mass experiences a stronger gravitational pull. This is why more massive objects weigh more on Earth. The relationship is linear - doubling the mass doubles the gravitational force acting on it.

The Greek letter Phi (Φ) is used to represent magnetic flux in physics. Magnetic flux is the measure of the magnetic field passing through a given area. Electric field uses E, magnetic field uses B, and electric flux typically uses Φ_E (with subscript E to distinguish from magnetic flux Φ).

Venus takes approximately 224.65 Earth days to complete one revolution around the Sun. This orbital period is slightly longer than Earth's 365.25 days. The precise value is 224.701 days, making 224.65 the closest option. Option A (225) is approximate, while C and D have incorrect decimal values.

Electric field is a vector quantity because it has both magnitude and direction. The direction of an electric field at any point is defined as the direction of the force that would be exerted on a positive test charge placed at that point. A scalar quantity only has magnitude (like temperature or mass), but no direction.

Venus was named after the Roman goddess of love and beauty. In Roman mythology, Venus was the goddess of love, beauty, desire, and fertility. The planet Venus, being the brightest and most beautiful object in the night sky after the Moon, was appropriately named after this goddess.

C.V. Raman (Chandrasekhara Venkata Raman) won the Nobel Prize in Physics in 1930 for his discovery of the Raman effect - the scattering of light and the change in wavelength. This made him the first Asian to receive a Nobel Prize in science. The other years (1927, 1957, 1937) are incorrect.

Albert Einstein was born on March 14, 1879 in Ulm, Germany. This is a well-documented historical fact. Option A (1869) would make him too old, while C (1873) and D (1883) are incorrect years.

Einstein was born in Ulm, Germany on March 14, 1879. Munich is where his family moved when he was an infant, and Zurich is where he later studied at university, but his actual birthplace was Ulm.

Einstein received the Nobel Prize in Physics for 1921, officially awarded in 1922. The prize recognized his work on the photoelectric effect and quantum theory, not relativity which is a common misconception.

Einstein received the 1921 Nobel Prize specifically for his 1905 work on the photoelectric effect, which established light's quantum nature. Relativity, though more famous, was explicitly excluded.

Satyendra Nath Bose collaborated with Albert Einstein in the 1920s to develop what is now known as Bose-Einstein statistics, which describes the behavior of certain fundamental particles. This work laid the foundation for Bose-Einstein condensate, a state of matter first predicted in 1924-1925.

The SEER (Seasonal Energy Efficiency Ratio) rating is the standard measure of air conditioning efficiency in North America. It calculates the cooling output during a typical cooling season divided by the total electric energy input during the same period. Higher SEER ratings indicate more efficient units, with modern systems typically rated between 13-21 SEER.

An air conditioning system performs three main functions: cooling (removing heat from the space), dehumidifying (removing moisture from the air), and air cleaning/filtration (removing dust and particles). These three functions work together to maintain comfortable indoor air quality.

It is a common myth that leaving AC running continuously saves energy. In reality, turning off the AC when not needed and turning it back on later is more energy-efficient. The energy consumed by running the AC all day at minimal level exceeds the energy needed to cool the space again later.

The statement suggests cranking the thermostat 5-7 degrees cooler than desired will cool the house faster. This is FALSE - a common HVAC myth. Your air conditioner cools at a constant rate regardless of the temperature setting. Setting it lower than necessary only wastes energy and can cause the system to overshoot, making the home uncomfortably cold and potentially creating humidity problems.

Turning off the tap while brushing teeth reduces both water consumption and the energy needed to pump, treat, and heat that water. This energy saving translates to approximately 3 kg of CO2 emissions prevented per year. It's a simple behavioral change that collectively makes a significant environmental impact when practiced by many people.