Energy Test - 9

According to the question the correct option will be ‘A’ because The chemical energy of the fuel is converted to kinetic energy using the engine of the bike.

According to the question the correct option will be ‘B’ because a photocell gives out electric current when light is incident on it. So, it converts light energy into electrical energy.

According to the question the correct option will be ‘C’ because the moving parts of a machine get heated due to friction, thus changing a part of mechanical energy into heat energy.

According to the question the correct option will be ‘B’ because the net amount of heat released

= Net amount of work done by frictional force

= ∫ Fds = 42 × 10J = 420J ≃ 100Cal

According to the question the correct option will be ‘C’ because

Let total M.E = 3x + 2x = 5x

This M.E. will be converted into Potential energy at the maximum height.

So, Ratio of height = Ratio of Potential energy

⇒ mgH : mgh = (P.E)H : (P.E)h

⇒ mgH : mgh = (P.E)H : (P.E)h

⇒ H : h = 5x : 2x = 5 : 2

According to the question the correct option will be ‘D’ because Some organisms like the glow worm have chemicals in them, which produce light.

According to the question the correct option will be ‘B’ because the chemical energy stored in batteries gets transformed into electrical energy through the wires. This then gets transformed into light energy that you see.

According to the question the correct option will be ‘B’ because by charging a battery, we convert electrical energy into chemical energy. A battery, on the contrary, in use, converts chemical energy into electrical energy.

According to the question, the correct option will be ‘C’ because A tube light converts electrical energy to Light Energy.

According to the question the correct option will be ‘C’ because Fuels contain chemical energy stored in them. when fuels are burnt, the chemical energy changes into heat and light energy.

According to the question the correct option will be ‘C’ because

Option A: Electrical bulb converts electrical energy into heat.

Option B: electrical motor converts electrical energy in mechanical energy.

Option C: battery converts chemical energy into electrical energy.

Option D: solar cell converts light (using photons) into electrical energy.

So best possible answer is option C.

According to the question the correct option will be ‘C’ because the potential energy stored in a reservoir at a given height is converted to kinetic energy (movement energy) which is used to turn a turbine and produce electricity.
Hence, as the water stored in the dam flows out, its potential energy changes to kinetic energy.

According to the question the correct option will be ‘B’ because when sunlight falls on plant, some of the energy is trapped through photosynthesis and is stored in the form of chemical energy which helps the plants to prepare their own food.

According to the question the correct option will be ‘B’ because when meteorite fall its potential energy is converting into kinetic energy and when it enters earth atmosphere due to air friction its kinetic energy is reduced but potential energy is also decreasing as its height is decreasing, so we can conclude that its first potential energy converts to kinetic energy and then kinetic energy converts to heat energy.

So best possible answer is option B.

According to the question, the correct option will be ‘C’ because when water is flowing it poses some kinetic energy and also poses some potential energy w.r.t to the lower level of the waterfall.
When waterfall from higher-level its potential energy gets converted to kinetic energy and when water reaches to lower level some part of its kinetic energy gets converted to sound energy and some to heat energy.