Explanation

Formula: Efficiency = 1 − (T₂/T₁)

Convert to Kelvin:

27°C = 300 K

277°C = 550 K

Efficiency = 1 − (300/550)

= 45.45%

Explanation

Formula:

M = 1 + D/f

D = 25 cm

f = 5 cm

M = 1 + 25/5

= 1 + 5

= 6

Explanation

Time period = 24 hours = 86400 seconds

Formula: f = 1/T

f = 1/86400 ≈ 1.16 × 10⁻⁵ Hz

Explanation

• Formula: Phase difference = (2π/λ) × Path difference
• π = (2π/λ) × Path difference
• Path difference = λ/2

Explanation

• The vestibular apparatus of the inner ear maintains balance during head movement.
• It detects the position and movement of the head.
• The semicircular canals detect rotational (angular) movements.
• The utricle and saccule detect linear acceleration and head position.
• The brain combines these signals to maintain posture and balance.

Last verified on 02-08-2026

Explanation

• In fluvial processes, small and shallow channels are called rills, which grow into gullies,

Additional information

• Valleys: Large, low-lying areas drained by rivers or streams.
• Deltas: Landforms created at the mouth of a river where it meets standing water.
• Levees: Raised ridges of sediment running along the banks of a river channel.

Explanation

• The visible light spectrum for the human eye generally ranges from approximately 380 to 750 nanometers (nm), with standard limits often cited from 400 to 700 nm. 

Wavelength Ranges by Color

1. Violet: 380 nm to 450 nm
2. Blue: 450 nm to 485 nm
3. Green: 485 nm to 500 nm
4. Yellow: 500 nm to 565 nm
5. Orange: 565 nm to 625 nm
6. Red: 625 nm to 750 nm 

Last updated 27-07-2026 by NA

Explanation

• Slate is a metamorphic rock.
• It is mainly formed from shale or mudstone.
• Formation occurs under low-grade heat and pressure.
• Volcanic ash can also contribute to its formation.
• Type: Fine-grained, foliated metamorphic rock.

Last updated 27-07-2026 by NA

Explanation

• SI stands for the International System of Units
• The world's standard modern metric system used for science, commerce, and everyday measurements.

The SI system is built upon seven fundamental base units: 

1. Metre (m) – for length
2. Kilogram (kg) – for mass
3. Second (s) – for time
4. Ampere (A) – for electric current
5. Kelvin (K) – for thermodynamic temperature
6. Mole (mol) – for amount of substance
7. Candela (cd) – for luminous intensity 

Last updated 27-07-2026 by NA

Explanation

• When tectonic plates slide past each other, they form faults or fault lines.
• This type of plate boundary is called a transform boundary.
• Movement along fault lines can cause earthquakes.
• A famous example is the San Andreas Fault in California, USA.

Last verified on 28-97-2026