Explanation

• A heat engine works between a hot source and a cold sink.
• Efficiency depends on the temperature difference between them.
• Greater the difference, higher the efficiency.
• Maximum efficiency is given by Carnot engine.

Last verified on 14-04-2026

Explanation

• A standing wave is formed by the interference of two waves of equal frequency and amplitude.
• Nodes are fixed points where particles do not move.
• At these points, displacement remains zero at all times.
• Energy transfer at nodes is minimum.

Last verified on 14-04-2026

Explanation

The largest planet in our solar system is Jupiter.

Additional information:

• It is the 5th planet in our solar system.
• The planet in the solar system with the maximum number of moons is Jupiter.
• Jupiter has 79 known moons.
• The Great Red Spot is a prominent feature of Jupiter.
• It is the giant planet and the fastest-rotating planet in our solar system.
• It rotates approximately once every 10 hours.
• The age of Jupiter is about 4.603 billion years.
• Mercury is the smallest planet of the solar system.

Last verified on 16-02-2026

Explanation

• Spider legs = 8 total
• Arrangement = 4 pairs
• Insects (like ants, bees) have only 3 pairs (6 legs)

 Last updated NA 12-04-2026

Explanation

• Boyle’s Law describes the relationship between pressure and volume.
• At constant temperature, gas behaves in a specific way.
• Pressure increases when volume decreases.
• Pressure decreases when volume increases.
• Formula: P₁V₁ = P₂V₂

Explanation

• Bohr’s model states that electrons move in fixed energy levels (shells).
• These paths are also called orbits or stationary states.
• Each orbit has a definite energy.
• Electrons do not lose energy in these orbits.

Last verified on 12-04-2026

Explanation

• According to Charles’s Law, volume is directly proportional to temperature (in Kelvin).
• At constant pressure: V ∝ T.
• If temperature doubles, volume also doubles.
• Gas expands when heated.
• So, volume becomes double.

Last verified on 12-04-2026

Explanation

• Newton’s First Law is also called the Law of Inertia.
• A body remains at rest or in uniform motion.
• It continues unless an external unbalanced force acts on it.

Last verified on 12-04-2026

Explanation

20 years = 2 half-lives  

Fraction left = (1/2)² = 1/4  

Last verified on 12-04-2026

Explanation

For parallel: 1/R = 1/4 + 1/6 = 3/12 + 2/12 = 5/12  

R = 12/5 = 2.4 Ω  

Last verified on 12-04-2026