Explanation

1 kilowatt-hour (kWh) is equivalent to 3.6 million joules (MJ).

As it represents the energy used when 1 kilowatt of power is consumed for 1 hour.

Explanation

Radiation transfers heat through electromagnetic waves and does not require a medium.

For example, the Sun's heat reaches Earth through radiation.

Explanation

Silicon (Si) is the element most commonly used to fabricate solar cells and transistors.

Silicon is a semiconductor material that is widely used in the production of electronic components, including:

• Solar cells (photovoltaic cells)
• Transistors
• Microprocessors
• Diodes

Explanation

Magnetic force acts perpendicular to motion.

Electron moves along the field → no perpendicular component → no force.

Explanation

Radius of orbit is directly proportional to speed.

Double the speed → double the radius → 4 cm.

Explanation

When the airplane’s nose is lifted by a gust, it oscillates around the equilibrium altitude before settling.

The oscillations gradually decrease in amplitude due to air resistance → typical underdamped motion.

Explanation

In a purely inductive AC circuit, V = I ω L.

Rearrange → L = V/(I ω) = 200/10 = 20 H.

Explanation

According to Einstein’s general relativity, both bodies and light rays follow the curved paths called geodesics in curved spacetime.

In the absence of gravity, geodesics reduce to straight lines.

Explanation

EMF = N × B × Area × ω

Solve for ω → ω = 12 ÷ (200 × 0.05 × 0.0256) ≈ 47 rad/s

Explanation

Number of possible input combinations = 2𝑛, where n = number of inputs.

For 4 inputs: 2⁴ = 16 combinations.