Our Environment Test - 11

Oil is considered as one of the conventional sources of energy. As these are the natural components which are there in nature in little amount and can't be used again and again. These are only be used once. They are also named as non-renewable sources of energy.

Hence, the correct option is (D).

Alpha particles, like helium nuclei, have a net spin of zero. Due to the mechanism of their production in standard alpha radioactive decay, alpha particles generally have a kinetic energy of about 5 MeV and a velocity in the vicinity of 4% the speed of light.

Hence, the correct option is (A).

A solar water heater cannot be used to get hot water on a cloudy day as there is no Sun which is necessary for the working of a solar water heater.

Hence, the correct option is (B).

The cover of the solar cooker is made of glass because glass allows the sunlight to pass through it and concentrate at one focal point, it also prevents heat to escape out of the cooker.

Hence, the correct option is (A).

It's called conservation of energy. A wind-up toy consists of a spring which is attached to a winder. When the winder is rotated the energy used to rotate the winder is stored in the spring in the form of potential energy. After releasing the winder the spring tries to unfold and the stored potential energy is converted into kinetic energy which is then transferred to the gears attached to the spring.

Hence, the correct option is (A).

Biomass energy is the energy that is derived from organic material and which is a renewable and sustainable source of energy. Wood,gobar-gas, and agricultural wastes are biomass energy sources whereas coal is not an example of a biomass energy source as it is a fossil fuel.

Hence, the correct option is (D).

On average, in the fission of U−235, 2.5 neutrons are emitted per fission when fission occurs due to slow neutrons.

Hence, the correct option is (B).

The Nuclear Power Corporation of India Limited (NPCIL) is a government-owned corporation of India based in Tarapur (Mumbai) in the state of Maharashtra. It is wholly owned by the Central Government and is responsible for the generation of nuclear power for electricity. NPCIL is administered by the Department of Atomic Energy, Govt. of India (DAE).

Hence, the correct option is (B).

In spite of the high cost and low efficiency, solar energy is used for many scientific and technological applications. Artificial satellites and space probes like Mars orbiters use solar energy as the main source of energy.

Hence, the correct option is (A).

The glass sheet in the solar cooker creates a greenhouse effect. Glass sheet has a property that allows the infrared rays of shorter wavelengths from the sun to get in the device but does not allow the IR rays of longer wavelengths to leave the solar heating device.

Hence, the correct option is (A).

Infrared radiation heating could provide a high heating rate and rapid moisture removal for wheat drying. hence, infrared light or infrared radiation is the component of sunlight which facilitates drying wheat after harvesting.

Hence, the correct option is (C).

Oil and petroleum are referred to as black gold. When extracted, it is black in colour, however, its market value is very high like gold.

Hence, the correct option is (C).

Denmark is a Country of winds because of the highly windy geographical area.

The production of Atomic energy has no involvement in any type of biological activity.

Hence, the correct option is (A).

A fossil fuel power station is a thermal power station which burns fossil fuel, such as coal or natural gas, to produce electricity. Fossil fuel power stations have the machinery to convert the heat energy of combustion into mechanical energy, which then operates an electrical generator.

Hence, the correct option is (B).

The blue zone at the bottom of the wick of a burning candle is due to the burning of carbon-monoxide gas produce by the incomplete combustion of carbon particles in wax.

Whereas the non- luminous zone is the outermost zone of the flame where complete combustion of wax takes place. It is faintly blue in colour but hardly visible.

Hence, the correct option is (A).