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Science M.C.Q

MODEL PAPER 2 · CBSE STD 10 (CBSE - English Medium). 20 questions.

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M.C.Q

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20 questions · timed · auto-graded

MCQ 11 Mark
Assertion (A): The second trophic level of a food chain operating in a grassland is mostly occupied by a carnivore
Reason (R): Carnivores feed upon herbivores and are secondary consumers.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • ✓
    A is false but R is true.
Answer
Correct option: D.
A is false but R is true.
(d) A is false but R is true.
Explanation: The second trophic level of a food chain is occupied by herbivores that feed on plants or producers that are
present in first trophic level.
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MCQ 21 Mark
Assertion (A): Two bar magnets attract when they are brought near to each other with the same pole.
Reason (R): Unlike poles will attract each other.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • ✓
    A is false but R is true.
Answer
Correct option: D.
A is false but R is true.
(d) A is false but R is true.
Explanation: A is false but R is true.
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MCQ 31 Mark
Assertion (A): Regeneration is getting a full organism back from its body parts.
Reason (R): In grafting, the stock is placed over the scion.
  • A
    Both A and R are true and R is the correct explanation of A
  • ✓
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: B.
Both A and R are true but R is not the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Regeneration is the process which involves repair of damaged cells/tissue or replacement or redevelopment of broken body part or reconstruction of whole body from a small body fragment. The simple animals like Hydra and Planaria
show regeneration. It means if Hydra or Planaria somehow get cut into a number of pieces, then each body piece can grow into
a complete organism.
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MCQ 41 Mark
Assertion (A): The colour of aqueous solution of copper sulphate turns colourless when a piece of lead is added to it.
Reason (R): Lead is more reactive than copper, and hence displaces copper from its salt solution
  • ✓
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A
(a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.
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MCQ 51 Mark
Which of the following groups contain only biodegradable items?
a. Grass, flowers and leather
b. Grass, wood and plastic
c. Fruit peels, cake and lime-juice
d. Cake, wood and grass
  • ✓
    Groups (a), (c) and (d)
  • B
    Groups (a), (b) and ©
  • C
    Groups (a), (b) and (d)
  • D
    Groups (b), (c) and (d)
Answer
Correct option: A.
Groups (a), (c) and (d)
(a) Groups (a), (c) and (d)
Explanation: The waste that is generated may be biodegradable or non-biodegradable. Substances that are broken down by biological processes are said to be biodegradable. Grass, flowers, leather, wood, fruit peels, cake and lime-juice are all biodegradable. Substances that are not broken down by biological processes are said to be non-biodegradable. Plastic is non- biodegradable. Plastic is inert and persists in the environment for a long time.
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MCQ 61 Mark
Use of high temperature for waste disposal is called………… .
  • A
    Composting
  • B
    Recycling
  • C
    Landfilling
  • ✓
    Incineration
Answer
Correct option: D.
Incineration
(d) Incineration
Explanation: Incineration is the process of burning substances under aerobic conditions at high temperature (usually more than 1000°C) in a closed unit called incinerator.
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MCQ 71 Mark
The elements of electric heating devices are usually made of:
  • ✓
    nichrome
  • B
    bronze
  • C
    argon
  • D
    tungsten
Answer
Correct option: A.
nichrome
(a) nichrome
Explanation: The elements of electric heating devices are made using nichrome.
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MCQ 81 Mark
The magnetic field inside the solenoid is:
  • A
    Non-uniform
  • B
    Variable
  • C
    Zero
  • ✓
    Same at all points
Answer
Correct option: D.
Same at all points
(d) Same at all points
Explanation: Same at all points
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MCQ 91 Mark
During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the
  • A
    Golgi body
  • B
    Mitochondria
  • C
    Chloroplast
  • ✓
    Cytoplasm
Answer
Correct option: D.
Cytoplasm
(d) Cytoplasm
Explanation: When there is a lack of oxygen Breakdown of Pyruvate takes place in the cytoplasm of muscle cells leading to the formation of Lactic acid.
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MCQ 101 Mark
In a plant, smooth seeds $(S)$ are dominant over wrinkled seeds $(s)$ and green seeds $(G)$ are dominant over yellow seeds $(g).$ A plant homozygous for smooth and green seed is crossed with a plant having wrinkled and yellow seeds. The $F_1$ offspring are self crossed to produce $F_2$ generation. If a total of $160$ offspring are produced, how many plants are expected to be having wrinkled and green seeds in $F_2$ generation, according to a typical Mendelian cross?
  • A
    $10$
  • B
    $90$
  • ✓
    $30$
  • D
    $20$
Answer
Correct option: C.
$30$
$30$
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MCQ 111 Mark
Characters transmitted from parents to offspring are present in
  • A
    Cytoplasm
  • ✓
    Genes
  • C
    Ribosome
  • D
    Golgi bodies
Answer
Correct option: B.
Genes
(b) Genes
Explanation: The characteristics or traits of parents are transmitted to their progeny (offsprings) through genes present on their
chromosomes
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MCQ 121 Mark
The egg of an animal contains 10 chromosomes, of which one is X-chromosome. How many autosomes would be there in the karyotype of this animal?
  • A
    9
  • ✓
    18
  • C
    8
  • D
    20
Answer
Correct option: B.
18
(b) 18
Explanation: Karyotype is the number and appearance of chromosomes in a nucleus of somatic cell. Somatic cells are diploid cells which make up the body. They have two sets of chromosomes. So, if an egg cell (gamete cell) which is a haploid cell (with single set of chromosomes)has 10 chromosome, then number of chromosomes present in a somatic cell will be 20 chromosomes. As egg cells are produced by female body, then among 20 chromosomes, two X chromosomes will be sex chromosome. So, karyotpe of that animals will be showing 18 autosomes.
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MCQ 131 Mark
Anaerobic process
  • ✓
    takes place in yeast during fermentation
  • B
    produces ethanol, oxygen, and energy
  • C
    takes place in the presence of oxygen
  • D
    produces only energy in the muscles of human beings
Answer
Correct option: A.
takes place in yeast during fermentation
(a) takes place in yeast during fermentation
Explanation: takes place in yeast during fermentation
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MCQ 141 Mark
The structural formula of an ester from which an acid and an alcohol is formed is as follows. Name the acid and the alcohol.
Image
  • A
    Formic acid, Ethanol
  • B
    Ethanoic acid, Ethanol
  • C
    Propanoic acid, Methanol
  • D
    Formic acid, Propanol
Answer
$HCOOCH _2 CH _2 CH _3+ H _2 O \rightarrow HCOOH + CH _3 CH _2 CH _2 OH$ The ester is $HCOOCH _2 CH _2 CH _3$. The product $\text{HCOOH}$ is formic acid or methanoic acid $($carboxylic acid$)$ and $\text{CH_3 CH_2CH_2OH}$ is propanol $($alcohol$)$.
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MCQ 151 Mark
If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of
  • ✓
    $\ce{CuCO_3}$
  • B
    $\ce{CuO}$
  • C
    $\ce{CuSO_4}$
  • D
    $\ce{Cu(NO_3)_2}$
Answer
Correct option: A.
$\ce{CuCO_3}$
Copper gets green coating due to the basic copper carbonate formation and is a mixture of copper carbonate and copper hydroxide when it reacts with carbon dioxide gas and moisture present in the air. This is called tarnishing of copper. The reaction is as follows:
$\ce{2Cu + H_2O + CO_2 + O_2 \rightarrow Cu(OH)_2 + CuCO_3}$
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MCQ 161 Mark
What is shown in the experiment given below:
Image
  • A
    Reaction of metals with salt solutions
  • B
    Heating a salt sample on a spatula
  • ✓
    Action of steam on a metal
  • D
    Testing the conductivity of a salt solution
Answer
Correct option: C.
Action of steam on a metal
(c) Action of steam on a metal
Explanation: Action of steam on a metal.
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MCQ 171 Mark
Which of the following is not an allotropic form of carbon?
  • A
    Diamond
  • ✓
    Fluorine
  • C
    Graphite
  • D
    Fullerene
Answer
Correct option: B.
Fluorine
(b) Fluorine
Explanation: Fluorine
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MCQ 181 Mark
Which one of the following types of medicines is used for treating indigestion?
  • ✓
    Antacid
  • B
    Antiseptic
  • C
    Antibiotics
  • D
    Analgesic
Answer
Correct option: A.
Antacid
(a) Antacid
Explanation: Antacids are mild bases which are given to a person suffering from acidity as acids reacts with bases to form salt and water. The excess acid present in the stomach is neutralised by the bases present in antacids and relieve indigestion.
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MCQ 191 Mark
Which of the following metals do not corrode in moist air?
  • A
    Iron
  • B
    Silver
  • C
    Copper
  • ✓
    Gold
Answer
Correct option: D.
Gold
(d) Gold
Explanation: Gold is a noble metals i.e., very less reactive metals and hence they do not get corrode easily in moist air.
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MCQ 201 Mark
A student took $\text{Cu, Al, Fe}$ and $Zn$ strips separately in four test tubes labelled $I, II, III$ and $IV.$ He added $10\  ml$. of freshly prepared ferrous sulphate solution to each test tube as shown below:
Image
Black residue would be obtained in test tubes
  • A
    $II$ and $IV$
  • B
    $I, II$ and $IV$
  • C
    $II$ and $III$
  • D
    $III$ and $IV$
Answer
 Black residue would be obtained in test tubes $II$ and $IV$ because $Al$ and $Zn$ will displace iron from $FeSO_4$ to form black residue as these are more reactive than iron.
$2 Al +3 FeSO _4 \rightarrow Al _2\left( SO _4\right)_3+3 Fe$
$Zn + FeSO _4 \rightarrow ZnSO _4+ Fe $
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