Que-2: Renewable source of energy is —

(a) coal
(b) fossil fuels
(c) natural gas
(d) sun

Ans: (d) sun
Hint-  A natural source providing us energy continuously is called a renewable (or non conventional) source of energy. Sun is the main source of energy for us on earth and is a renewable source.

Que-3: A natural source providing us energy continuously is called –

(a) non-renewable
(b) conventional
(c) renewable
(d) none of the above

Ans: (c) renewable
Hint-  From the point of view of availability, the various sources of energy are classified into the following two groups —

1. Renewable or non-conventional sources of energy — are sources from which energy can be obtained continuously over a long period of time.
2. Non-renewable or conventional sources of energy — sources from which energy cannot be continuously obtained over a long period of time.

Que-4: The …………… energy of wind is called wind energy.

(a) potential
(b) chemical
(c) electric
(d) kinetic

Ans: (d) kinetic
Hint-  The large mass of moving air is called wind. Due to motion, it has kinetic energy. The kinetic energy of wind is called wind energy.

Que-5: The energy obtained from the sun is called –

(a) solar
(b) renewable
(c) non-renewable
(d) both (a) and (b)

Ans: (d) both (a) and (b)
Hint-  Sun is the main source of various types of energy. The energy obtained from the sun is called solar energy. It is a renewable source of energy.

Que-6: The value of solar constant is

(a) 1.34 kW km^-2
(b) 1.34 kW m^-2
(c) 1.34 kW m²
(d) none of the above

Ans: (b) 1.34 kW m^-2
Hint- The average solar energy reaching the upper atmosphere of earth per second on an area of 1 metre² is called solar constant and is estimated to be 1.34 kW m^-2.

Que-7: The correct renewable sources of energy are :

(i) Biomass
(ii) Nuclear fuel
(iii) Coal
(iv) Petroleum
(a) (i)
(b) (iii)
(c) (ii) and (iv)
(d) (i) and (ii)

Ans: (d) (i) and (ii)
Hint-  Coal and petroleum are non-renewable sources whereas, biomass and nuclear fuel are renewable sources.

Que-8: Geothermal energy is the energy possessed by the:

(a) Sun
(b) Wind
(c) Biomass
(d) Rocks

Ans: (d) Rocks
Hint-  At some places, rocks below the surface of the earth are very hot. Such places are known as hot spots. The heat energy possessed by rocks inside the earth is called geothermal energy.

Que-9: The main constituent of biogas is :

(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) methane

Ans: (d) methane
Hint-  The main constituent of biogas is methane (65%) and the rest is a mixture of carbon dioxide, hydrogen and hydrogen sulphide.

Que-10: The chemical formula of the strong-smelling substance that is mixed in LPG is :

(a) C₂H₂SH
(b) C₂H₅SH
(c) CH₅SH
(d) C₂SH₃

Ans: (b) C₂H₅SH
Hint-  LPG is stored in gas cylinders after mixing a strong smelling substance called ethyl mercaptan (C₂H₅SH) so that the gas leakage, if any, from the cylinder can easily be detected.

Que-11: The process used for refining of petroleum is known as:

(a) evaporation
(b) filteration
(c) distillation
(d) fractional distillation

Ans: (d) fractional distillation
Hint-  The process of separating useful components from crude petroleum is called refining which is done by fractional distillation in big oil refiners set up for this purpose.

Que-12: Identify the incorrect statement/s about solar panels.

(i) The running costs of solar panels is very high.
(ii) They do not cause any pollution.
(iii) They last over a long period of time.
(a) (i)
(b) (ii)
(c) (iii)
(d) (i) and (iii)

Ans: (a) (i)

Que-13:  The non-renewable sources of energy are :

(a) Coal
(b) Petroleum
(c) Natural gas
(d) All of the above

Ans: (d) All of the above
Hint- Coal, petroleum, and natural gas are non-renewable sources of energy. These resources are finite and take millions of years to form. Once they are depleted, they cannot be replenished within a human timescale.

—  end of  Heat and Energy Class-9 Exe-6C MCQs Concise Physics ICSE Selina Solutions Ch-6.  :—

Return to:  Concise Selina Physics ICSE Class-9 Solutions

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