CBSE Class 10 Physics Source of Energy MCQs Set 34

Physics Objective Questions and Answers: Source of Energy

Explore reliable objective questions for Source of Energy tailored for Class 10 learners. Utilizing these Physics multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

Download Source of Energy MCQs with Answers

View or download the dedicated Source of Energy MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Physics evaluations.

Multiple Choice Questions

Question 1: Wood is a:
(a) primary fuel
(b) liquid fuel
(c) processed fuel
(d) secondary fuel
Show Answer & Explanation

Answer: (a) primary fuel

Explanation:
1. Wood is found in nature and used as such, so it is a primary fuel.

Teacher's Note:
1. Primary fuels occur in nature.
2. Secondary fuels are made from primary fuels.

Question 2: Kinetic energy of moving air in coastal or hilly areas is harnessed to do mechanical work or generate electricity by using:
(a) wind mills
(b) generators
(c) electric motors
(d) shafts
Show Answer & Explanation

Answer: (a) wind mills

Explanation:
1. Wind mills use the wind to rotate blades, and the rotation is used to do work or drive a generator.

Teacher's Note:
1. Wind farms group many windmills.

Question 3: A moderator is used in a nuclear reactor for:
(a) slowing down neutrons
(b) accelerating neutrons
(c) stopping neutrons
(d) heating the neutrons
Show Answer & Explanation

Answer: (a) slowing down neutrons

Explanation:
1. Slow neutrons are more likely to cause fission of U-235.
2. Heavy water or graphite is used to slow down the fast neutrons.

Teacher's Note:
1. Moderator: slows neutrons.
2. Control rods: absorb neutrons.

Question 4: Which of the following is NOT a solid fuel?
(a) coke
(b) coal
(c) charcoal
(d) kerosene
Show Answer & Explanation

Answer: (d) kerosene

Explanation:
1. Coke, coal and charcoal are solids.
2. Kerosene is a liquid fuel.

Teacher's Note:
1. Kerosene is a petroleum product.
2. Coal and its products are solid.

Question 5: The number of nucleons in a nucleus is called its:
(a) mass number
(b) atomic number
(c) neutron number
(d) electron number
Show Answer & Explanation

Answer: (a) mass number

Explanation:
1. Nucleons are protons plus neutrons, and their total is the mass number.

Teacher's Note:
1. Atomic number counts only the protons.

Question 6: The source of energy of the sun is:
(a) nuclear fission
(b) chemical reaction
(c) nuclear fusion
(d) none of these
Show Answer & Explanation

Answer: (c) nuclear fusion

Explanation:
1. In the sun, hydrogen nuclei fuse into helium and release enormous energy.

Teacher's Note:
1. Four hydrogen nuclei give one helium nucleus.

Question 7: A hydrogen bomb is based on:
(a) nuclear fission reaction
(b) controlled chain reaction
(c) thermonuclear fusion reaction
(d) uncontrolled chain reaction
Show Answer & Explanation

Answer: (c) thermonuclear fusion reaction

Explanation:
1. A hydrogen bomb fuses hydrogen isotopes at the very high temperature produced by an atom bomb (a fission trigger), so it is based on thermonuclear fusion.

Teacher's Note:
1. Atom bomb: uncontrolled fission.
2. Hydrogen bomb: fusion.

Question 8: Which of the following has the least penetrating power?
(a) alpha particles
(b) gamma rays
(c) beta particles
(d) all have the same penetrating power
Show Answer & Explanation

Answer: (a) alpha particles

Explanation:
1. Alpha particles are stopped by a sheet of paper.
2. Beta particles need thin aluminium, and gamma rays need thick lead.

Teacher's Note:
1. Penetration: alpha < beta < gamma.
2. Ionising power is in the reverse order.

Question 9: Energy available from the oceans is:
(a) OTE (ocean thermal energy)
(b) sea-waves energy
(c) tidal energy
(d) all of the above
Show Answer & Explanation

Answer: (d) all of the above

Explanation:
1. The oceans give thermal energy (temperature difference), wave energy and tidal energy.
2. So all the above are correct.

Teacher's Note:
1. Three ocean sources: tides, waves and thermal difference.

Question 10: The device in which nuclear fission is carried out and the release of energy is controlled is known as:
(a) thermopile
(b) thermostat
(c) nuclear reactor
(d) cloud chamber
Show Answer & Explanation

Answer: (c) nuclear reactor

Explanation:
1. In a nuclear reactor the chain reaction is controlled with control rods, so energy is released at a steady rate.

Teacher's Note:
1. Control rods absorb extra neutrons.
2. An atom bomb is uncontrolled fission.

Question 11: In the sun, four hydrogen nuclei combine to form a helium nucleus. The energy released is about:
(a) 13 MeV
(b) 26 MeV
(c) 39 MeV
(d) none of these
Show Answer & Explanation

Answer: (b) 26 MeV

Explanation:
1. The overall fusion releases about 26 MeV for every helium nucleus formed.

Teacher's Note:
1. Fusion releases about 6.5 MeV per nucleon.

Question 12: A nucleus has 16 neutrons and its mass number is 31. The atomic number is:
(a) 47
(b) 31
(c) 15
(d) 16
Show Answer & Explanation

Answer: (c) 15

Explanation:
1. Mass number = protons + neutrons.
2. Protons = 31 – 16 = 15, so the atomic number is 15 (phosphorus).

Teacher's Note:
1. Z = A – N.

Question 13: Biogas is a mixture of:
(a) CO + H2 + CH4
(b) CO + H2
(c) CO2 + CH4 + H2 + H2S
(d) CO2 + N2
Show Answer & Explanation

Answer: (c) CO2 + CH4 + H2 + H2S

Explanation:
1. Anaerobic decomposition of cattle dung gives mainly methane (about 75%), along with carbon dioxide, hydrogen and hydrogen sulphide.

Teacher's Note:
1. Methane is the main component of biogas.
2. Biogas burns without smoke.

Question 14: Nuclear energy is:
(a) renewable
(b) non-renewable
(c) both renewable and non-renewable
(d) none of these
Show Answer & Explanation

Answer: (b) non-renewable

Explanation:
1. The fuels (uranium, plutonium) are limited and cannot be replenished, so nuclear fission energy is a non-renewable source.

Teacher's Note:
1. Uranium ores are finite.
2. Solar and wind are renewable.

Question 15: The energy of the sun is available on earth in the form of:
(a) heat only
(b) light only
(c) heat and light both
(d) none of these
Show Answer & Explanation

Answer: (c) heat and light both

Explanation:
1. Sunlight brings both light and heat (infrared and ultraviolet radiation as well).

Teacher's Note:
1. Solar energy travels as electromagnetic radiation.

Question 16: In a thermal power plant, heat energy is converted into:
(a) light energy
(b) electrical energy
(c) sound energy
(d) potential energy
Show Answer & Explanation

Answer: (b) electrical energy

Explanation:
1. Fuel burns to make steam, the steam turns a turbine, and the turbine drives a generator that gives electrical energy.

Teacher's Note:
1. Chain: chemical → heat → mechanical → electrical.

Question 17: Fusion reactions occur at:
(a) low pressures
(b) low temperature
(c) extremely high temperature
(d) high temperature and low pressure
Show Answer & Explanation

Answer: (c) extremely high temperature

Explanation:
1. Nuclei repel one another, and extremely high temperature (millions of kelvin) is needed to bring them close enough to fuse.
2. That is why it is called a thermonuclear reaction.

Teacher's Note:
1. The sun's core is at about 107 K.
2. Fusion is difficult to control on earth.

Question 18: Solar energy can be used to produce:
(a) electrical energy
(b) heat energy
(c) mechanical energy
(d) all of the above
Show Answer & Explanation

Answer: (d) all of the above

Explanation:
1. Solar cells convert sunlight into electrical energy, solar cookers and heaters give heat, and heat engines can give mechanical energy.
2. So all the forms listed can be produced.

Teacher's Note:
1. Sunlight can be converted into several forms.
2. Solar cells give electricity directly.

Question 19: Choose the source of energy that is different from the others:
(a) wood
(b) falling water
(c) wind
(d) petroleum
Show Answer & Explanation

Answer: (d) petroleum

Explanation:
1. Wood (biomass), falling water and wind are renewable.
2. Petroleum is a fossil fuel that takes millions of years to form, so it is non-renewable.

Teacher's Note:
1. Fossil fuels are non-renewable.
2. The odd one out is the one that gets exhausted.

Question 20: The digester of a biogas plant is a sealed chamber in which there is no:
(a) carbon
(b) nitrogen
(c) hydrogen
(d) oxygen
Show Answer & Explanation

Answer: (d) oxygen

Explanation:
1. Decomposition takes place anaerobically, that is, in the absence of oxygen.

Teacher's Note:
1. Anaerobic bacteria act on the slurry.

Question 21: The ultimate source of energy for fuels is:
(a) coal
(b) the sun
(c) natural gas
(d) petroleum
Show Answer & Explanation

Answer: (b) the sun

Explanation:
1. Fossil fuels formed from plants and animals that depended on sunlight, so the sun is the ultimate source.

Teacher's Note:
1. Photosynthesis stores solar energy.

Question 22: In the nuclear reaction 23592U + 10n → 14156Ba + 9236Kr + 3X + 200 MeV, X represents:
(a) proton
(b) neutron
(c) electron
(d) alpha particle
Show Answer & Explanation

Answer: (b) neutron

Explanation:
1. Mass number: 235 + 1 = 236 = 141 + 92 + 3A, so A = 1.
2. Charge: 92 = 56 + 36 + 3Z, so Z = 0.
3. A particle with A = 1 and Z = 0 is a neutron.

Teacher's Note:
1. Balance the mass number and the atomic number on both sides.
2. The 3 released neutrons carry on the chain reaction.

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Practice MCQs for Class 10 Physics Source of Energy

Class 10 Physics Source of Energy Objective Test Questions

Explore reliable practice questions for Source of Energy tailored for Class 10 Physics learners. Use these multiple-choice formats to evaluate preparedness and strengthen problem-solving skills.

NCERT-Aligned Objective Questions and Solutions

Each question includes structured solution keys mapped directly to standard CBSE textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.

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FAQs

Where can I access latest CBSE Class 10 Physics Source of Energy MCQs Set 34?

You can get most exhaustive CBSE Class 10 Physics Source of Energy MCQs Set 34 for free on StudiesToday.com. These MCQs for Class 10 Physics are updated for the 2026-27 academic session as per CBSE examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Physics Class 10 material?

Yes, our CBSE Class 10 Physics Source of Energy MCQs Set 34 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the CBSE paper is now competency-based.

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