Physics 0625 03

What is the primary distinction between renewable and non-renewable primary energy sources?

• Renewable sources are more efficient than non-renewable sources.

• Non-renewable sources are environmentally friendly, while renewable sources are not.

• Renewable sources can be replenished naturally over time, while non-renewable sources are finite and deplete with use.

• Non-renewable sources are more expensive to harness compared to renewable sources.

Which are the secondary sources?

i. coal

ii. uranium

iii. solar cells

iv. electricity

• i, ii, iii

• ii, iii, iv

• All of above

• None of above

Why does the world need more energy compared to the past?

• Industrialization and technological advancements have led to higher energy demands.

• The Earth's natural resources are becoming less accessible, increasing energy consumption.

• People are less reliant on technology and modern conveniences.

• The global population has decreased over time, leading to increased energy needs.

Which uses of the energy sources is incorrect?

• Solar energy - Heating water for residential use

• Wind energy - Generating electricity for a city's power grid

• Geothermal energy - Powering vehicles and transportation

• Biomass energy - Producing heat for cooking and heating in rural areas

Why is the usage of non-renewable resources higher than renewable resources?

• Non-renewable resources are more environmentally friendly and sustainable.

• Renewable resources are more expensive to extract and utilize.

• Non-renewable resources are more abundant and easily accessible.

• Renewable technologies are still in experimental stages and not widely available.

What is meant by an 'induced voltage' in physics?

• The voltage produced by a direct current source.

• The voltage generated by a battery.

• The voltage applied to an electric circuit.

• The voltage created in a conductor due to a changing magnetic field.

How does a generator work?

• By converting mechanical energy into electrical energy through electromagnetic induction.

• By converting thermal energy into mechanical energy.

• By converting chemical energy into electrical energy.

• By converting kinetic energy into potential energy.

What is the primary difference between a simple generator and a generator in a power station?

• The size of the generator.

• The method of energy conversion.

• The voltage output they produce.

• The type of fuel they use.

How can a bigger voltage be induced in a generator?

• By reducing the size of the generator.

• By decreasing the speed of rotation.

• By using fewer turns of wire in the coil.

• By increasing the strength of the magnetic field.

Which of the following are advantages of a bicycle dynamo compared to a battery-powered light?

i. Dependence on external power sources.

ii.Longer lifespan of the lighting system.

iii.Reduced environmental impact.

iv.Limited availability in the market.

• ii only

• i and ii

• ii and iii

• iii and iv