Tag: physics

Questions Related to physics

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


Correct Option: B

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

  1. Petrol

  2. Hydrogen

  3. Uranium

  4. Coal


Correct Option: B
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.

Non-conventional sources of energy are 

  1. pollution-free

  2. renewable

  3. inexhaustible

  4. exhaustible


Correct Option: A,B,C
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.

The source of energy which is different from others is

  1. Lignite

  2. Natural gas

  3. Sun

  4. Coal


Correct Option: C

The generation of electricity from water energy

  1. Will never get exhausted

  2. Will not produce any environmental pollution

  3. Is renewable source of energy

  4. All the above are correct


Correct Option: D

Which of the following is a renewable source of energy

  1. Wood

  2. Petrol

  3. LPG

  4. None of these


Correct Option: D
The magnitude of buoyant force acting on an object immersed in a liquid depends on
  1. Volume of object immersed in the liquid.
  2. Density of the liquid.

  3. Both A and B

  4. None


Correct Option: C
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.

The property of a fluid to exert a buoyant force on an object immersed in it is known as _______.

  1. Adhesion

  2. Buoyancy

  3. Cohesion

  4. none of these


Correct Option: B
Explanation:

The property of fluid to exert a buoyant force on an object immersed in it known as Buoyancy .

so  option (B) is correct

When a body is partially or completely immersed in a fluid at rest, it experiences an upthrust which is equal to the weight of the fluid displaced by it.

  1. True

  2. False


Correct Option: A
Explanation:

The given statement is the statement of archimedes principle , so it is true 

hence option (A) is correct

The upward force exerted by the floating body on the fluid is known as upthrust.

  1. True

  2. False


Correct Option: B
Explanation:
Upthrust is the upward force acting on the floating body and is exerted by the fluid .
so given statement is false

hence option (B) is correct