Tag: physics

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Multiple choice physics towards green energy non-conventional sources of energy electric energy generation and environment renewable and non-renewable energy

Non-conventional forms of energy can be

  1. created.

  2. transduced from other forms of energy.

  3. exhausted in our lifetime.

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Non-conventional energy sources, such as solar or wind, involve converting natural energy flows into usable forms like electricity. They are not created from nothing but are transduced from existing natural energy forms.

Multiple choice physics towards green energy non-conventional sources of energy electric energy generation and environment renewable and non-renewable energy

Which fuel has the highest energy content per unit of mass of any chemical fuel?

  1. Petrol

  2. Hydrogen

  3. Uranium

  4. Coal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hydrogen fuel is a zero-emission fuel when burned with oxygen (if one considers water not as an emission) or used in a contained cell (allowing to react galvanically) also capable of 'reversing' the reaction if needed. It often uses electrochemical cells, or combustion in internal engines, to power vehicles and electric devices. It is also used in the propulsion of spacecraft and might potentially be mass-produced and commercialized for passenger vehicles and aircraft.

Multiple choice physics towards green energy non-conventional sources of energy electric energy generation and environment renewable and non-renewable energy

Non-conventional sources of energy are 

  1. pollution-free

  2. renewable

  3. inexhaustible

  4. exhaustible
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

 Natural resources like wind, tides, solar, biomass, etc generate energy which is known as "Non-conventional resources“. These are pollution free ,renewable,inexhaustible  and hence we can use these to produce a clean form of energy without any wastage.

Multiple choice physics floatation pressure in fluids pressure in liquids introduction to pressure
The magnitude of buoyant force acting on an object immersed in a liquid depends on

  1. <div>Volume of object immersed in the liquid.</div>

  2. Density of the liquid.

  3. Both A and B

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to Archimedes Principle, the magnitude of buoyant force experienced is equal to the weight of liquid displaced by it by being placed in it.

Hence $B=V _{immersed}\rho g$
Hence $B$ depends both on $V _{immersed}$ and $\rho$.
Correct answer is option C.