10th Science - Complete One Mark Questions & Answers

Unit 1: Laws of Motion

Choose the correct answer
  1. Inertia of a body depends on
    a) weight of the object b) acceleration due to gravity of the planet c) mass of the object d) Both a & b
    Answer: c) mass of the object
  2. Impulse equals
    a) rate of change of momentum b) rate of force and time c) change of momentum d) rate of change of mass
    Answer: c) change of momentum
  3. Newton's III law is applicable
    a) for a body is at rest b) for a body in motion c) both a & b d) only for bodies with equal masses
    Answer: c) both a & b
  4. Plotting a graph for momentum on the Y-axis and time on X-axis, the slope of the momentum-time graph gives
    a) Impulsive force b) Acceleration c) Force d) Rate of force
    Answer: a) Impulsive force
  5. In which of the following sport is the turning effect of force used?
    a) swimming b) tennis c) cycling d) hockey
    Answer: d) hockey
  6. The unit of 'g' is m s⁻². It can also be expressed as
    a) cm s⁻¹ b) N kg⁻¹ c) Nm² kg⁻¹ d) cm² s⁻²
    Answer: b) N kg⁻¹
  7. One kilogram force equals
    a) 9.8 dyne b) 9.8 × 10⁴ N c) 98 × 10⁴ dyne d) 980 dyne
    Answer: c) 98 × 10⁴ dyne
  8. The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth, then its value will be ____ kg
    a) 4M b) 2M c) M/4 d) M
    Answer: d) M
  9. If the Earth shrinks to 50% of its real radius, its mass remaining the same, the weight of a body on the Earth will
    a) decrease by 50% b) increase by 50% c) decrease by 25% d) increase by 300%
    Answer: d) increase by 300%
  10. To project rockets, which of the following principle(s) is/are required?
    a) Newton's third law of motion b) Newton's law of gravitation c) Law of conservation of linear momentum d) both a and c
    Answer: d) both a and c
Fill in the blanks
  1. To produce a displacement force is required.
  2. Passengers lean forward when sudden brake is applied in a moving vehicle. This can be explained by inertia.
  3. By convention, the clockwise moments are taken as negative and the anticlockwise moments are taken as positive.
  4. Gear is used to change the speed of car.
  5. A man of mass 100 kg has a weight of 980 N at the surface of the Earth.

Unit 2: Optics

Choose the correct answer
  1. The refractive index of four substances A, B, C, and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
    a) A b) B c) C d) D
    Answer: a) A
Fill in the blanks
  1. The path of the light is called as ray.

Unit 3: Thermal Physics

Choose the correct answer
  1. The value of universal gas constant
    a) 3.81 Jmol⁻¹K⁻¹ b) 8.03 Jmol⁻¹K⁻¹ c) 1.38 Jmol⁻¹K⁻¹ d) 8.31 Jmol⁻¹K⁻¹
    Answer: d) 8.31 Jmol⁻¹K⁻¹
  2. If a substance is heated or cooled, the change in mass of that substance is
    a) positive b) negative c) zero d) none of the above
    Answer: c) zero
  3. If a substance is heated or cooled, the linear expansion occurs along the axis of
    a) X or –X b) Y or –Y c) both (a) and (b) d) (a) or (b)
    Answer: d) (a) or (b)
  4. Temperature is the average ___________ of the molecules of a substance
    a) difference in K.E and P.E b) sum of P.E and K.E c) difference in T.E and P.E d) difference in K.E and T.E
    Answer: b) sum of P.E and K.E
Fill in the blanks
  1. The value of Avogadro number 6.022 × 10²³.
  2. The temperature and heat are scalar quantities.
  3. One calorie is the amount of heat energy required to raise the temperature of 1 gram of water through 1°C.
  4. According to Boyle's law, the shape of the graph between pressure and reciprocal of volume is straight line.

Unit 4: Electricity

Choose the correct answer
  1. Which of the following is correct?
    a) Rate of change of charge is electrical power. b) Rate of change of charge is current. c) Rate of change of energy is current. d) Rate of change of current is charge.
    Answer: b) Rate of change of charge is current.
  2. SI unit of resistance is
    a) mho b) joule c) ohm d) ohm meter
    Answer: c) ohm
  3. In a simple circuit, why does the bulb glow when you close the switch?
    a) The switch produces electricity. b) Closing the switch completes the circuit. c) Closing the switch breaks the circuit. d) The bulb is getting charged.
    Answer: b) Closing the switch completes the circuit.
  4. Kilowatt hour is the unit of
    a) resistivity b) conductivity c) electrical energy d) electrical power
    Answer: c) electrical energy
Fill in the blanks
  1. When a circuit is open, current cannot pass through it.
  2. The ratio of the potential difference to the current is known as resistance.
  3. The wiring in a house consists of parallel circuits.
  4. The power of an electric device is a product of voltage and current.
  5. LED stands for Light Emitting Diode.

Unit 5: Acoustics

Choose the correct answer
  1. When a sound wave travels through air, the air particles
    a) vibrate along the direction of the wave motion b) vibrate but not in any fixed direction c) vibrate perpendicular to the direction of the wave motion d) do not vibrate
    Answer: a) vibrate along the direction of the wave motion
  2. Velocity of sound in a gaseous medium is 330 ms⁻¹. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is
    a) 330 ms⁻¹ b) 660 ms⁻¹ c) 156 ms⁻¹ d) 990 ms⁻¹
    Answer: a) 330 ms⁻¹
  3. The frequency, which is audible to the human ear is
    a) 50 kHz b) 20 kHz c) 15000 kHz d) 10000 kHz
    Answer: b) 20 kHz
  4. The velocity of sound in air at a particular temperature is 330 ms⁻¹. What will be its value when temperature is doubled and the pressure is halved?
    a) 330 ms⁻¹ b) 165 ms⁻¹ c) 330 × √2 ms⁻¹ d) 320 / √2 ms⁻¹
    Answer: c) 330 × √2 ms⁻¹
  5. If a sound wave travels with a frequency of 1.25 × 10⁴ Hz at 344 ms⁻¹, the wavelength will be
    a) 27.52 m b) 275.2 m c) 0.02752 m d) 2.752 m
    Answer: c) 0.02752 m
  6. The sound waves are reflected from an obstacle into the same medium from which they were incident. Which of the following changes?
    a) speed b) frequency c) wavelength d) none of these
    Answer: d) none of these

Unit 6: Nuclear Physics

Choose the correct answer
  1. Man-made radioactivity is also known as
    a) Induced radioactivity b) Spontaneous radioactivity c) Artificial radioactivity d) a & c
    Answer: d) a & c
  2. Unit of radioactivity is
    a) roentgen b) curie c) Becquerel d) all the above
    Answer: d) all the above
  3. Artificial radioactivity was discovered by
    a) Bequerel b) Irene Curie c) Roentgen d) Neils Bohr
    Answer: b) Irene Curie
  4. In which of the following, no change in mass number of the daughter nuclei takes place
    a) (i) is correct b) (ii) and (iii) are correct c) (i) & (iv) are correct d) (ii) & (iv) are correct
    Answer: b) (ii) and (iii) are correct
  5. ____________ isotope is used for the treatment of cancer.
    a) Radio Iodine b) Radio Cobalt c) Radio Carbon d) Radio Nickel
    Answer: b) Radio Cobalt
Fill in the blanks
  1. One roentgen is equal to 3.7 × 10¹⁰ disintegrations per second.
  2. Positron is an antiparticle of electron.
  3. Anemia can be cured by Iron-59 isotope.
  4. Abbreviation of ICRP International Commission on Radiological Protection.

Unit 7: Atoms and Molecules

Choose the correct answer
  1. The value of Avogadro number is
    a) 6.023 × 10²³ b) 6.022 × 10²³ c) 6.022 × 10²² d) 6.023 × 10²²
    Answer: b) 6.022 × 10²³
  2. The SI unit of atomic mass is
    a) gram b) kilogram c) amu d) Dalton
    Answer: c) amu
  3. The molecular formula of ozone is
    a) O₂ b) O₃ c) O₄ d) O
    Answer: b) O₃
  4. The number of atoms present in a molecule of sulphur is
    a) 6 b) 8 c) 2 d) 4
    Answer: b) 8
  5. The valency of carbon is
    a) 2 b) 4 c) 3 d) 1
    Answer: b) 4
Fill in the blanks
  1. The atomicity of phosphorus is 4.
  2. The atomic mass of nitrogen is 14.
  3. The symbol of sodium is Na.
  4. The chemical formula of washing soda is Na₂CO₃.
  5. The number of molecules in one mole of a substance is 6.022 × 10²³.

Unit 8: Periodic Classification of Elements

Choose the correct answer
  1. The element with atomic number 17 belongs to
    a) Group 1 b) Group 2 c) Group 17 d) Group 18
    Answer: c) Group 17
  2. The modern periodic table is based on
    a) atomic mass b) atomic number c) atomic volume d) atomic radius
    Answer: b) atomic number
  3. The number of periods in the modern periodic table is
    a) 7 b) 8 c) 9 d) 10
    Answer: a) 7
  4. The most electronegative element is
    a) Oxygen b) Fluorine c) Chlorine d) Nitrogen
    Answer: b) Fluorine
  5. The elements in group 18 are called
    a) Alkali metals b) Halogens c) Noble gases d) Transition elements
    Answer: c) Noble gases
Fill in the blanks
  1. The first period contains 2 elements.
  2. The horizontal rows in the periodic table are called periods.
  3. The vertical columns in the periodic table are called groups.
  4. The atomic number of sodium is 11.
  5. The element with atomic number 12 is magnesium.

Unit 9: Solutions

Choose the correct answer
  1. A solution is a __________ mixture.
    a) homogeneous b) heterogeneous c) colloidal d) none of these
    Answer: a) homogeneous
  2. The solute in a solution is the substance which is
    a) present in larger amount b) present in smaller amount c) equal amount d) none of these
    Answer: b) present in smaller amount
  3. The universal solvent is
    a) alcohol b) ether c) water d) benzene
    Answer: c) water
  4. The process of separating a solid from a liquid by filtration is called
    a) sedimentation b) decantation c) filtration d) evaporation
    Answer: c) filtration
  5. The mass of solute present in 100g of solution is called
    a) molarity b) molality c) normality d) mass percent
    Answer: d) mass percent
Fill in the blanks
  1. The component present in larger quantity in a solution is called solvent.
  2. The process of dissolving a solute in a solvent is called solvation.
  3. A solution in which no more solute can be dissolved at a given temperature is called saturated solution.
  4. The process of separating salt from water is called evaporation.
  5. The process of separating cream from milk is called centrifugation.

Unit 10: Types of Chemical Reactions

Choose the correct answer
  1. The reaction in which two or more substances combine to form a single product is called
    a) Decomposition b) Combination c) Displacement d) Double displacement
    Answer: b) Combination
  2. The reaction in which heat is absorbed is called
    a) Exothermic b) Endothermic c) Combination d) Decomposition
    Answer: b) Endothermic
  3. The reaction between an acid and a base is called
    a) Redox b) Neutralization c) Precipitation d) Displacement
    Answer: b) Neutralization
  4. The reaction in which a compound splits up into two or more simpler substances is called
    a) Combination b) Decomposition c) Displacement d) Double displacement
    Answer: b) Decomposition
  5. The reaction in which an element replaces another element in a compound is called
    a) Combination b) Decomposition c) Displacement d) Double displacement
    Answer: c) Displacement
Fill in the blanks
  1. The chemical reaction in which energy is released is called exothermic reaction.
  2. The reaction between sodium hydroxide and hydrochloric acid is an example of neutralization reaction.
  3. The reaction in which a substance gains oxygen is called oxidation.
  4. The reaction in which a substance loses hydrogen is called oxidation.
  5. The reaction in which a solid product is formed is called precipitation reaction.

Unit 11: Carbon and its Compounds

Choose the correct answer
  1. The allotrope of carbon used in lead pencils is
    a) Diamond b) Graphite c) Fullerene d) Charcoal
    Answer: b) Graphite
  2. The general formula of alkanes is
    a) CnH2n+2 b) CnH2n c) CnH2n-2 d) CnH2n+1
    Answer: a) CnH2n+2
  3. The functional group present in alcohol is
    a) –COOH b) –CHO c) –OH d) –CO
    Answer: c) –OH
  4. The IUPAC name of CH₄ is
    a) Methane b) Ethane c) Propane d) Butane
    Answer: a) Methane
  5. The process of heating coal in the absence of air is called
    a) Combustion b) Carbonization c) Oxidation d) Reduction
    Answer: b) Carbonization
Fill in the blanks
  1. The purest form of carbon is diamond.
  2. The process of conversion of wood into charcoal is called destructive distillation.
  3. The compound used as a refrigerant is freon.
  4. The simplest alkene is ethene.
  5. The general formula of alkynes is CnH2n-2.

Unit 12: Biology

Choose the correct answer
  1. The basic unit of life is
    a) Atom b) Cell c) Molecule d) Tissue
    Answer: b) Cell
  2. The cell organelle responsible for photosynthesis is
    a) Mitochondria b) Chloroplast c) Ribosome d) Nucleus
    Answer: b) Chloroplast
  3. The powerhouse of the cell is
    a) Nucleus b) Mitochondria c) Chloroplast d) Ribosome
    Answer: b) Mitochondria
  4. The genetic material in a cell is
    a) Protein b) DNA c) Lipid d) Carbohydrate
    Answer: b) DNA
  5. The process of cell division is called
    a) Mitosis b) Meiosis c) Both a and b d) None of these
    Answer: c) Both a and b
Fill in the blanks
  1. The structural and functional unit of life is cell.
  2. The green pigment present in plants is chlorophyll.
  3. The cell organelle responsible for respiration is mitochondria.
  4. The process of formation of new cells is called cell division.
  5. The genetic material present in the nucleus is DNA.

Unit 13: Plant Physiology

Choose the correct answer
  1. The process by which green plants prepare their own food is
    a) Respiration b) Photosynthesis c) Transpiration d) Digestion
    Answer: b) Photosynthesis
  2. The loss of water from the aerial parts of a plant is
    a) Photosynthesis b) Respiration c) Transpiration d) Digestion
    Answer: c) Transpiration
  3. The process of conversion of light energy into chemical energy is
    a) Respiration b) Photosynthesis c) Transpiration d) Digestion
    Answer: b) Photosynthesis
  4. The process of exchange of gases in plants is called
    a) Respiration b) Photosynthesis c) Transpiration d) Digestion
    Answer: a) Respiration
  5. The tissue responsible for the transport of water in plants is
    a) Phloem b) Xylem c) Parenchyma d) Collenchyma
    Answer: b) Xylem
Fill in the blanks
  1. The process by which plants lose water is called transpiration.
  2. The tissue responsible for transport of food in plants is phloem.
  3. The pigment responsible for photosynthesis is chlorophyll.
  4. The process of breakdown of glucose to release energy is called respiration.
  5. The tissue responsible for transport of water in plants is xylem.

Unit 14: Animal Physiology

Choose the correct answer
  1. The process of taking food into the body is
    a) Digestion b) Ingestion c) Absorption d) Assimilation
    Answer: b) Ingestion
  2. The process of breaking down of food into simpler substances is
    a) Digestion b) Ingestion c) Absorption d) Assimilation
    Answer: a) Digestion
  3. The organ responsible for pumping blood is
    a) Brain b) Heart c) Lungs d) Kidney
    Answer: b) Heart
  4. The process of removal of waste products from the body is
    a) Digestion b) Ingestion c) Excretion d) Assimilation
    Answer: c) Excretion
  5. The organ responsible for excretion is
    a) Heart b) Lungs c) Kidney d) Brain
    Answer: c) Kidney
Fill in the blanks
  1. The process of taking food into the body is called ingestion.
  2. The organ responsible for pumping blood is heart.
  3. The process of breaking down of food into simpler substances is called digestion.
  4. The organ responsible for excretion is kidney.
  5. The process of removal of waste products from the body is called excretion.

Unit 15: Genetics

Choose the correct answer
  1. The basic unit of heredity is
    a) Chromosome b) Gene c) DNA d) RNA
    Answer: b) Gene
  2. The number of chromosomes in a human cell is
    a) 23 b) 46 c) 44 d) 22
    Answer: b) 46
  3. The scientist who is known as the father of genetics is
    a) Darwin b) Mendel c) Watson d) Crick
    Answer: b) Mendel
  4. The process of transfer of characters from parents to offspring is
    a) Variation b) Heredity c) Mutation d) Evolution
    Answer: b) Heredity
  5. The structure that carries genes is
    a) Chromosome b) Nucleus c) Ribosome d) Mitochondria
    Answer: a) Chromosome
Fill in the blanks
  1. The basic unit of heredity is gene.
  2. The number of chromosomes in a human cell is 46.
  3. The scientist who is known as the father of genetics is Mendel.
  4. The process of transfer of characters from parents to offspring is called heredity.
  5. The structure that carries genes is chromosome.

Unit 16: Evolution

Choose the correct answer
  1. The theory of natural selection was proposed by
    a) Lamarck b) Darwin c) Mendel d) Wallace
    Answer: b) Darwin
  2. The process by which new species are formed is
    a) Variation b) Mutation c) Speciation d) Adaptation
    Answer: c) Speciation
  3. The study of fossils is called
    a) Palaeontology b) Anthropology c) Archaeology d) Zoology
    Answer: a) Palaeontology
  4. The preserved remains of ancient organisms are called
    a) Fossils b) Bones c) Shells d) Teeth
    Answer: a) Fossils
  5. The process by which organisms adjust to their environment is
    a) Evolution b) Adaptation c) Mutation d) Variation
    Answer: b) Adaptation
Fill in the blanks
  1. The theory of natural selection was proposed by Darwin.
  2. The process by which new species are formed is called speciation.
  3. The study of fossils is called palaeontology.
  4. The preserved remains of ancient organisms are called fossils.
  5. The process by which organisms adjust to their environment is called adaptation.

Unit 17: Reproduction in Plants and Animals

Choose the correct answer
  1. The process by which plants reproduce without seeds is
    a) Sexual reproduction b) Asexual reproduction c) Vegetative reproduction d) Spore formation
    Answer: b) Asexual reproduction
  2. The male reproductive organ in plants is
    a) Stigma b) Style c) Stamen d) Ovary
    Answer: c) Stamen
  3. The female reproductive organ in plants is
    a) Stigma b) Style c) Stamen d) Ovary
    Answer: d) Ovary
  4. The process of fusion of male and female gametes is
    a) Pollination b) Fertilization c) Germination d) Reproduction
    Answer: b) Fertilization
  5. The organ responsible for production of sperm in human males is
    a) Ovary b) Testis c) Uterus d) Penis
    Answer: b) Testis
Fill in the blanks
  1. The process by which plants reproduce without seeds is called asexual reproduction.
  2. The male reproductive organ in plants is stamen.
  3. The female reproductive organ in plants is ovary.
  4. The process of fusion of male and female gametes is called fertilization.
  5. The organ responsible for production of sperm in human males is testis.

Unit 18: Health and Hygiene

Choose the correct answer
  1. The disease caused by deficiency of vitamin C is
    a) Scurvy b) Rickets c) Beriberi d) Night blindness
    Answer: a) Scurvy
  2. The disease caused by deficiency of vitamin D is
    a) Scurvy b) Rickets c) Beriberi d) Night blindness
    Answer: b) Rickets
  3. The disease caused by deficiency of vitamin A is
    a) Scurvy b) Rickets c) Beriberi d) Night blindness
    Answer: d) Night blindness
  4. The disease caused by deficiency of vitamin B1 is
    a) Scurvy b) Rickets c) Beriberi d) Night blindness
    Answer: c) Beriberi
  5. The process of maintaining cleanliness to prevent disease is
    a) Health b) Hygiene c) Immunity d) Nutrition
    Answer: b) Hygiene
Fill in the blanks
  1. The disease caused by deficiency of vitamin C is scurvy.
  2. The disease caused by deficiency of vitamin D is rickets.
  3. The disease caused by deficiency of vitamin A is night blindness.
  4. The disease caused by deficiency of vitamin B1 is beriberi.
  5. The process of maintaining cleanliness to prevent disease is called hygiene.

Unit 19: Environmental Science

Choose the correct answer
  1. The main source of energy for the environment is
    a) Sun b) Moon c) Stars d) Earth
    Answer: a) Sun
  2. The process by which green plants make their food is
    a) Respiration b) Photosynthesis c) Transpiration d) Digestion
    Answer: b) Photosynthesis
  3. The process of conversion of waste into reusable material is
    a) Recycling b) Composting c) Incineration d) Landfilling
    Answer: a) Recycling
  4. The gas responsible for greenhouse effect is
    a) Oxygen b) Carbon dioxide c) Nitrogen d) Hydrogen
    Answer: b) Carbon dioxide
  5. The process of planting trees to increase forest cover is
    a) Deforestation b) Afforestation c) Reforestation d) Desertification
    Answer: b) Afforestation
Fill in the blanks
  1. The main source of energy for the environment is sun.
  2. The process by which green plants make their food is photosynthesis.
  3. The process of conversion of waste into reusable material is called recycling.
  4. The gas responsible for greenhouse effect is carbon dioxide.
  5. The process of planting trees to increase forest cover is afforestation.

Unit 20: Applied Biology

Choose the correct answer
  1. The technique of growing plants without soil is
    a) Hydroponics b) Aeroponics c) Tissue culture d) Grafting
    Answer: a) Hydroponics
  2. The process of improving the genetic quality of crops is
    a) Breeding b) Hybridization c) Mutation d) Selection
    Answer: a) Breeding
  3. The process of producing identical plants from a single cell is
    a) Hybridization b) Tissue culture c) Mutation d) Selection
    Answer: b) Tissue culture
  4. The process of transferring pollen from one flower to another is
    a) Pollination b) Fertilization c) Germination d) Reproduction
    Answer: a) Pollination
  5. The process of growing fish in ponds is
    a) Pisciculture b) Apiculture c) Sericulture d) Horticulture
    Answer: a) Pisciculture
Fill in the blanks
  1. The technique of growing plants without soil is hydroponics.
  2. The process of improving the genetic quality of crops is breeding.
  3. The process of producing identical plants from a single cell is tissue culture.
  4. The process of transferring pollen from one flower to another is pollination.
  5. The process of growing fish in ponds is pisciculture.

Unit 21: Biotechnology

Choose the correct answer
  1. The technique of transferring genes from one organism to another is
    a) Hybridization b) Genetic engineering c) Mutation d) Selection
    Answer: b) Genetic engineering
  2. The process of making copies of DNA is
    a) Cloning b) Replication c) Transcription d) Translation
    Answer: b) Replication
  3. The process of making identical organisms is
    a) Cloning b) Replication c) Transcription d) Translation
    Answer: a) Cloning
  4. The enzyme used to cut DNA at specific sites is
    a) Ligase b) Restriction enzyme c) Polymerase d) Helicase
    Answer: b) Restriction enzyme
  5. The process of introducing foreign DNA into a cell is
    a) Transformation b) Transduction c) Conjugation d) Translation
    Answer: a) Transformation
Fill in the blanks
  1. The technique of transferring genes from one organism to another is called genetic engineering.
  2. The process of making copies of DNA is called replication.
  3. The process of making identical organisms is called cloning.
  4. The enzyme used to cut DNA at specific sites is restriction enzyme.
  5. The process of introducing foreign DNA into a cell is called transformation.

Unit 22: Human Welfare

Choose the correct answer
  1. The process of immunization protects against
    a) Diseases b) Pollution c) Malnutrition d) Accidents
    Answer: a) Diseases
  2. The process of providing clean drinking water is
    a) Sanitation b) Purification c) Filtration d) Chlorination
    Answer: b) Purification
  3. The process of removing solid waste from the environment is
    a) Sanitation b) Purification c) Filtration d) Chlorination
    Answer: a) Sanitation
  4. The process of providing proper nutrition to children is
    a) Immunization b) Supplementation c) Fortification d) Malnutrition
    Answer: b) Supplementation
  5. The process of controlling the spread of diseases is
    a) Immunization b) Sanitation c) Quarantine d) Isolation
    Answer: c) Quarantine
Fill in the blanks
  1. The process of immunization protects against diseases.
  2. The process of providing clean drinking water is purification.
  3. The process of removing solid waste from the environment is sanitation.
  4. The process of providing proper nutrition to children is supplementation.
  5. The process of controlling the spread of diseases is quarantine.

Unit 23: Space Science

Choose the correct answer
  1. The first artificial satellite launched by India is
    a) Aryabhata b) Bhaskara c) INSAT d) Rohini
    Answer: a) Aryabhata
  2. The first man to step on the moon is
    a) Yuri Gagarin b) Neil Armstrong c) Rakesh Sharma d) Kalpana Chawla
    Answer: b) Neil Armstrong
  3. The planet known as the Red Planet is
    a) Mercury b) Venus c) Mars d) Jupiter
    Answer: c) Mars
  4. The largest planet in the solar system is
    a) Earth b) Jupiter c) Saturn d) Uranus
    Answer: b) Jupiter
  5. The natural satellite of the Earth is
    a) Moon b) Mars c) Venus d) Jupiter
    Answer: a) Moon
Fill in the blanks
  1. The first artificial satellite launched by India is Aryabhata.
  2. The first man to step on the moon is Neil Armstrong.
  3. The planet known as the Red Planet is Mars.
  4. The largest planet in the solar system is Jupiter.
  5. The natural satellite of the Earth is Moon.