Explanation

Stokes' law applies to small spherical particles in viscous fluids. 

Stokes' law describes the drag force exerted on a spherical particle moving slowly through a viscous fluid.

And it is only valid for small, spherical particles moving in a laminar flow with low Reynolds numbers

Where the viscosity of the fluid plays a significant role. 

Explanation

 The temperature scale that is independent of the nature of the working substance is the Thermodynamic scale (Kelvin scale). 

Explanation

The correct answer is:  All of the above

A complete revolution corresponds to an angular displacement of:

• 360°

• $2\pi$ radians

So, for 2 complete revolutions:

• Degrees: $2\times 360°=720°$

• Radians: $2 times 2pi = 4pi$ radians

• Approximate radians:

  $$4\pi \approx 4\times 3.14=12.56\text{ radians (rounded to 12.6)}$$

Explanation

Kinetic energy formula: KE = ½ mv²

Let initial KE = ½ * m * v²  

New KE = ½ * (3m) * (2v)²  

= ½ * 3m * 4v²  

= 6mv²  

Now divide new KE by original KE:  

(6mv²) / (½mv²) = 12 times

Explanation

A diode is a semiconductor device that allows current to flow in one direction only.

It effectively acting as a one-way valve for electrical current.

This property makes it useful in various electronic circuits for controlling the direction of current flow.

Explanation

The work done on a unit charge against an electric field intensity is called electric potential.

It is also known as voltage or potential difference.

It is measured in volts (V) and represents the energy transferred per unit charge.

Electric potential (V) = Work done (W) / Charge (Q)

V = W / Q

Explanation

X-rays are a type of electromagnetic radiation that are commonly used in radiotherapy to destroy cancer cells.

They have enough energy to penetrate deep into tissue and damage the DNA of cancer cells, slowing their growth or killing them.

Explanation

Oscillations are damped due to the presence of frictional force.

Frictional force opposes motion and converts some of the kinetic energy into heat energy, causing the oscillations to decay over time.

There are three main types of frictional force that can cause damping:

• Viscous damping (e.g., air resistance, water resistance)
• Coulomb damping (e.g., friction between surfaces)
• Internal damping (e.g., within the material itself)

Explanation

Specific heat capacity is the thermal energy transfer required per unit mass to increase the temperature of a substance by 1°C (or 1 K).

It is a measure of how much heat energy a substance can absorb or release per unit mass per unit temperature change.

Explanation

The renewable energy sources are:

• Water energy
• Wind energy
• Tidal energy
• Solar energy
• Hydroelectric
• Ocean energy
• Geothermal energy
• Biomass
• Biogas

The non-renewable energy sources are:

• Fossil fuels or Hydrocarbon fuel (Oil, Natural gas, Coal)
• Nuclear energy