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Science M.C.Q

MODEL PAPER 10 · 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): Recycling is the way of managing plastic waste.
Reason (R): Broken plastic articles are sent to plastic processing units where they are melted and remoulded to make new plastic articles.
  • 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.
  • D
    A is false but R is true.
Answer
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Plastics are non-biodegradable. They cannot be decomposed by the action of microbes. Recycling them can
manage them effectively.
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MCQ 21 Mark
Assertion (A): A compass is kept near a wire carrying current gets deflected
Reason (R): Electric current is capable of producing a magnetic effect.
  • 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.
  • D
    A is false but R is true
Answer
(a) Both A and R are true and R is the correct explanation of A.
Explanation: Here while carrying out an experiment if a compass needle is placed near a wire carrying current then due to the
effect of magnetism which is produced due to electric current produced in the wire the needle gets deflected. Which shows that
the magnetism and electricity are interlinked. So, both assertion and reason are true and reason is the correct explanation of
assertion.
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MCQ 31 Mark
Assertion (A): DNA copying is necessary during reproduction.
Reason (R): DNA copying leads to the transmission of characters from parents to offspring.
  • 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.
  • D
    A is false but R is true.
Answer
(a) Both A and R are true and R is the correct explanation of A
Explanation: DNA copying is necessary during reproduction because it leads to the transmission of characters from parents to
offsprings and brings about variation.
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MCQ 41 Mark
Assertion (A): Silver articles become black after sometime when exposed to sunlight
Reason (R): It is because silver reacts with carbonates present in the air.
  • 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.
  • D
    A is false but R is true.
Answer
(c) A is true but R is false.
Explanation: Silver reacts with sulphur present in the air and forms a layer of silver sulphide, therefore, silver articles get
tarnished. Thus assertion is true, but reason is false.
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MCQ 51 Mark
Food web is constituted by
  • A
    relationship between animals and environment.
  • B
    relationship between plants and animals
  • C
    various interlinked food chains in an ecosystem
  • D
    relationship between the organisms and the environment
Answer
(c) various interlinked food chains in an ecosystem
Explanation: A food chain is a series of plants/animals which are interrelated in the form of an organism being eaten as food
by the other. The Food web is constituted by various interlinked and interdependent food chains in a community. It is also
called a consumer-resource system. The ecosystem consists of living organisms and their abiotic environment. Thus, the correct
answer is 'Various interlinked food chains in a community.
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MCQ 61 Mark
Food chains generally do not exceed above 3 or 4 trophic levels because _________ .
  • A
    A producer cannot be eaten by more than two herbivores
  • B
    Transfer of energy from one trophic level to other is associated with energy loss
  • C
    here are limited number of organisms in an ecosystem
  • D
    Larger food chains increase complications of food web
Answer
(b) Transfer of energy from one trophic level to other is associated with energy loss
Explanation: The quantum of available energy in a food chain successively gets decreased at each trophic level as a result of
energy loss. This limits the number of trophic levels in a food chain.
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MCQ 71 Mark
Two LED bulbs of 12W and 6W are connected in series. If the current through 12W bulb is 0.06A the current through 6W bulb will be:
  • A
    0.12A
  • B
    0.04A
  • C
    0.08A
  • D
    0.06A
Answer
(d) 0.06A
Explanation: Both bulb receive the same current because they are connected in series. They will have different voltages.
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MCQ 81 Mark
The strength of an electromagnet after the limit cannot be increased by increasing the current through the solenoid. What is the reason behind this phenomenon?
  • A
    Voltage through the solenoid gradually starts to decrease.
  • B
    Electrons start to corrode the solenoid.
  • C
    Resistance of the solenoid increases.
  • D
    Current flowing through the solenoid is saturated
Answer
(d) Current flowing through the solenoid is saturated.
Explanation: Current flowing through the solenoid is saturated.
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MCQ 91 Mark
The blood leaving the tissues becomes richer in
  • A
    Oxygen
  • B
    Heamoglobin
  • C
    Water
  • D
    Carbon dioxide
Answer
(d) Carbon dioxide
Explanation: Because of respiration, Carbon dioxide gets accumulated in tissues. Hence, blood leaving the tissues becomes
richer in Carbon dioxide.

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MCQ 101 Mark
The component of a chromosome that controls heredity is
  • A
    Histones
  • B
    Proteins
  • C
    RNA
  • D
    DNA
Answer
(d) DNA
Explanation: Heredity is the passing on of traits from parents to their offspring, either through asexual reproduction or sexual
reproduction; the offspring cells or organisms acquire the genetic information of their parents.
Heritable traits are known to be passed from one generation to the next via DNA, a molecule that encodes genetic information.

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MCQ 111 Mark
In human beings, fertilization of ovum takes place in:
  • A
    Fallopian tubes
  • B
    Ovary
  • C
    Uterus
  • D
    Vagina
Answer
(a) Fallopian tubes
Explanation: The fertilization of ovum takes place in the ampulla of the fallopian tube.
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MCQ 121 Mark
Select the group which shares maximum number of common characters-
  • A
    two genera of a family
  • B
    two individuals of a species
  • C
    two species of a genus
  • D
    wo genera of two families
Answer
(b) two individuals of a species
Explanation: species is the lowest level of classification and shows the high level of similarities among the organisms. so two
individuals of a species have the maximum common characteristics.
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MCQ 131 Mark
If the solute concentration of raisin is more inside then:
  • A
    endosmosis rate will be same
  • B
    endosmosis rate will be less
  • C
    endosmosis rate will be more
  • D
    endosmosis process will not occur
Answer
(c) endosmosis rate will be more
Explanation: endosmosis rate will be more
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MCQ 141 Mark
Ethane - with the molecular formula $C _2 H _6$ has
  • A
    9 covalent bonds
  • B
    8 covalent bonds
  • C
    7 covalent bonds
  • D
    6 covalent bonds
Answer
(c) 7 covalent bonds
Explanation: Ethane - with the molecular formula $C _2 H _6$ - has 7 covalent bonds. 1 covalent bond (C - C) exists between the two carbon atoms. 3 C - H covalent bonds are formed by 3 hydrogen atoms with each carbon atom.
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MCQ 151 Mark
Which one of the following statements is true about the position of metals in the activity series of metals?
  • A
    Copper is below hydrogen but above lead
  • B
    Iron is below lead and zinc
  • C
    Zinc is below magnesium but above aluminium
  • D
    Magnesium is below calcium but above aluminium
Answer
(d) Magnesium is below calcium but above aluminium
Explanation: Magnesium is below calcium but above aluminium
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MCQ 161 Mark
Aluminum is used for making cooking utensils. Which of the following properties of aluminum are responsible for the same?

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i. Good thermal conductivity
ii. Good electrical conductivity
iii. Ductility
iv. High melting point
  • A
    (i) and (ii)
  • B
    (i) and (iii)
  • C
    (ii) and (iii)
  • D
    (i) and (iv)
Answer
(d) (i) and (iv)
Explanation: Aluminium has good thermal conductivity and high melting point. These properties are useful in the making of
utensils. The commonly used metals in making utensils are copper, steel (an alloy of iron) and aluminium. Copper and aluminium are the most preferred due to their conduction of heat.
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MCQ 171 Mark
When ethanol reacts with sodium two products are formed. These products are:
  • A
    Sodium ethanoate and oxygen
  • B
    Sodium ethoxide and oxygen
  • C
    Sodium ethoxide and hydrogen
  • D
    Sodium ethanoate and hydrogen
Answer
(c) Sodium ethoxide and hydrogen
Explanation: This reaction can be shown by the following equations:
$2 Na +2 CH _3 CH _2 OH \longrightarrow 2 CH _3 CH _2 ONa + H _2$
Therefore, the products formed are sodium ethoxide and hydrogen.
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MCQ 181 Mark
Which of the following salts contains water of crystallization?
A. Gypsum
B. Epsom salt
C. Blue vitriol
D. Glauber’s salt
  • A
    C and D
  • B
    A, B, C and D
  • C
    A and B
  • D
    B and D
Answer
(b) A, B, C and D
Explanation: All the above salts contain water of crystallization and their chemical formulae are given below:
Gypsum - $CaSO 4.2 H _2 O$ - (2 molecules of water of crystallization)
Epsom salt - $MgSO _4 \cdot 7 H _2 O$ - (7 molecules of water of crystallization)
Blue vitriol - $CuSO _4 \cdot 5 H _2 O$ - (5 molecules of water of crystallization)
Glauber's salt - $ Na _2 SO _4 \cdot 10 H _2 O$ - (10 molecules of water of crystallization)
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MCQ 191 Mark
When iron filings are added to a solution of CuSO4, the reaction taking place is a-
  • A
    Redox reaction
  • B
    Combination reaction
  • C
    Displacement reaction
  • D
    Decomposition reaction
Answer
(c) Displacement reaction
Explanation: Reactions in which atoms or ions move from one compound to others to form a new compound are known as
Displacement reactions.
$Fe ( s )+ CuSO _4( aq ) \rightarrow Cu ( s )+ FeSO _4( aq )$
Fe being more reactive is able to displace $CuSO _4$ solution.
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MCQ 201 Mark
The copper articles turn green when kept for long due to
Image
  • A
    Corrosion
  • B
    Rusting
  • C
    Precipitation
  • D
    Rancidity
Answer
(a) Corrosion
Explanation: The copper articles turn green when kept for long due to corrosion in which metal is eaten up gradually by the
action of air, moisture or a chemical (such as an acid) on their surface.
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