In a classroom discussion, the students gave their views regarding the greenhouse effect. Which one is true?

Correct! Wrong!

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Greenhouse effect is a naturally occurring phenomenon aggravated by man. It is because of this, that life on earth is possible, as it provides the required temperature for organisms to survive. Otherwise it would have been a freezing -18???. It is only when other gases (due to pollution) aggravate this process, that it becomes harmful to mankind.

The atom bomb works on the principle of ____.

Correct! Wrong!

Atom bomb works on the principle of uncontrolled nuclear fission reaction.

The mode of transfer of heat by the actual movement of molecules present in the medium is called convection of heat.

Correct! Wrong!

The mode of transfer of heat by the actual movement of molecules present in the medium is called convection of heat.

Among the four main greenhouse gases, the most common and important one is ____.

Correct! Wrong!

Among the four main greenhouse gases, the most common and important one is carbondioxide. Carbondioxide is present naturally in the atmosphere, but now its concentration in the atmosphere has gone up alarmingly. According to an estimate, Carbondioxide levels rose from 290 ppm to 320 ppm (a 10% increase) in the troposphere, from 1870 to 1970. It is expected to be more than double by 2030 AD.

Which source of energy is used in artificial satellites?

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The source of energy in artificial satellites is solar energy.

A green house is ____.

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A green house is a glass house used for growing plants to protect them from extreme climatic conditions.

Beaker containing water and crystals of potassium permanganate is heated. The coloured water molecules ____.

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When the water in the beaker is heated, the molecules which are heated rise upwards while the colder and the denser molecules move downwards. Hence, coloured water rises upwards.

Which one is the correct grazing chain?

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Grass → Grass hopper→ Frog → Snake → Eagle is the correct grazing chain.

The cooking utensils are provided with copper bottoms in place of steel bottoms.

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Copper is a good conductor of heat when compared to steel. The amount of heat supplied by copper bottom utensils is more compared to steel bottom in the same time. Cooking in copper bottom utensils will take less time, due to which fuel consumption is reduced. Hence, cooking utensils are provided with copper bottoms.

The solar energy received by each square meter of upper atmosphere of the earth per second is ____.

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The solar energy received by each square meter of upper atmosphere of the earth per second is 1.36 kJ/s.

An example of a good conductor is ____.

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Lead is a metal, which is a good conductor of heat. Plastic, thermo col and saw dust are insulators of heat.

The heat received by a body due to radiation does not depend on the medium.

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The heat received by a body due to radiation does not depend on the medium as this process of heat transfer does not require medium for its flow.

The process of burning fuel is called ____.

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The process of burning fuel is called combustion.

Which of the following may correctly identify the role(s) of some bacteria in an ecosystem?

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Bacteria can be Autotrophs (Producers), Heterotrophs (Consumers) or Decomposers.

____ is a renewable source of energy.

Correct! Wrong!

Tidal energy is a renewable source of energy. Coal, petroleum and natural gas are non-renewable sources of energy.

An Owl feeding on mice represents ____.

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Mice can be primary or secondary consumer, so an owl feeding on mice can be a secondary or a tertiary consumer.

The land and sea breeze are convection currents.

Correct! Wrong!

Land breeze and sea breeze occurs due to the motion of hot air upwards and cold air moving down, to fill the space vacated by hot air, hence convection currents are set up.

A wooden chair and a metallic chair are placed in sunlight for a long duration. If we are asked to sit on one of them, we will sit on the ____ chair because it is a ____ conductor of heat.

Correct! Wrong!

As both the chairs are in sunlight, for long duration the temperature will be same for both of them. If we sit on wooden chair we do not feel it very hot because being a bad conductor it does not transfer heat quickly. Hence, we sit on wooden chair, because it is a bad conductor of heat.

A motor converts electrical energy into ____.

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A motor converts electrical energy into mechanical energy.

Which of the following pair of energies does not create pollution?

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Solar and wind energy does not create any pollution.

Plants can capture ____.

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Of the incident solar radiation, less than 50% is Photosynthetically active radiation or PAR. Plants capture only 2-10% of this PAR.

Transfer of heat from one place to another without affecting the medium is called radiation.

Correct! Wrong!

Transfer of heat from one place to another without affecting the medium is called radiation.

The flow of heat from one part of the body at higher temperature to another part of the same body at lower temperature is called conduction of heat.

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The flow of heat from one part of the body at higher temperature to another part of the same body at lower temperature is called conduction of heat.

The objects which do not allow the heat to pass through them are called ____.

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The objects which do not allow the heat to pass through them are called insulators.

Which of the following source produces high amount of energy?

Correct! Wrong!

Coal, petroleum and wood are conventional sources of energy. Whereas uranium is nuclear source of energy. For same quantity of matter, nuclear sources will give million times larger energy than conventional sources.

Natural gas mainly consists of ____.

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Natural gas mainly consists of methane.

By 'greenhouse effect' scientists mean____.

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By greenhouse effect scientists mean the effect of gases in the air trapping energy from radiations and making the earth's surface very hot. Certain gases present in the atmosphere prevent the radiations from reflecting back into the atmosphere. These radiations, in a way get trapped in the earth's atmosphere and heat up the air around it.

The fusion reaction occurs at ____.

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The fusion reaction occurs at very high temperature. Nuclear fusion is the cause of solar energy.

Which of the following statements is true about Grazing food chains (GFC) and Detritus food chain (DFC)?

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GFC is the major conduit of energy for aquatic food chains. As against this, in a terrestrial ecosystem, a much larger fraction of energy flows through the DFC.

Ocean energy is harnessed from ____ energy.

Correct! Wrong!

Ocean energy is harnessed from tidal energy.

ICSE Class 9th Physics - Heat and Energy MCQs
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