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Science M.C.Q

MODEL PAPER 7 · 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): Ozone is very important layer of atmosphere.
Reason (R): Ozone protects the living organisms from harmful UV radiation of sun.
  • 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: Both A and R are true and R is the correct explanation of A.
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MCQ 21 Mark

Assertion (A): The magnitude of the magnetic field at a point on the axis of a current-carrying solenoid is inversely proportional to the current flowing through the solenoid. 
Reason (R): The magnitude of the magnetic field at a point on the axis of a current-carrying solenoid is directly proportional to the number of turns per unit length of a solenoid. 

  • 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
(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): Amoeba always produces two daughter amoebae while Plasmodium divides into many daughter cells.
Reason (R): Amoeba undergoes binary fission while Plasmodium undergoes multiple fission.
  • 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: Both A and R are true and R is the correct explanation of A.
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MCQ 41 Mark

Assertion (A): Corrosion of iron is commonly known as rusting
Reason (R): Corrosion of iron occurs in presence of water and 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
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Both A and R are true but R is not the correct explanation of A. Corrosion occurs due to the oxidation of iron.
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MCQ 51 Mark
In which of the following food chains, does the man get more energy?
Plant $-$ Man
Plant $-$ Goat $-$ Man
  • ✓
    Plant $-$ Man
  • B
    Plant $-$ Goat $-$ Man
  • C
    Different equal energy in both food chain
  • D
    Equal energy in both food chain
Answer
Correct option: A.
Plant $-$ Man
According to an extensive study, $10\%$ can be taken as the average value for the amount of organic matter that is
present at each step and reaches the next level of consumers. Therefore, man gets more energy in the first food chain. In the
first case, man gets around $10\%$ of the energy produced by the plant. In the second case, man gets around $1\%$ of the energy
produced by the plant.
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MCQ 61 Mark
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about:
  • A
    10%
  • B
    8%
  • C
    5%
  • D
    1%
Answer
(d) 1%
Explanation: The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about one percent. The green plants (producers) use this solar energy for the process of photosynthesis, convert it into food energy and make the energy available to the rest of the ecosystem.
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MCQ 71 Mark
When more than one resistors are in series, the quantity that remains same in them is
  • A
    Potential difference
  • B
    Ammeter
  • C
    Resistance
  • D
    Current
Answer
(d) Current
Explanation: Resistors in series have same current.
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MCQ 81 Mark
The magnetic field lines due to straight wire carrying a current are
  • A
    Parabolic
  • B
    Straight
  • C
    Circular
  • D
    Elliptical
Answer
(c) Circular
Explanation: The nature of the magnetic field lines around a straight current-carrying conductor is concentric circles with
centre at the axis of the conductor.
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MCQ 91 Mark
The kidneys in human beings are a part of the system for
  • A
    respiration
  • B
    excretion
  • C
    nutrition
  • D
    transportation
Answer
(b) excretion
Explanation: Excretion is the process by which metabolic wastes and other non-useful materials are eliminated from an
organism. In Human beings, kidneys are the organs that filter waste products from the blood. Therefore, Kidneys are the part of
the excretory system.
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MCQ 101 Mark
For evolution to occur in a population, which of the following must happen?
i. The frequencies of some alleles in an organism's genotypes must change during its lifetime.
ii. The frequencies of each allele in an organism's genotype must remain constant within its lifetime.
iii. The frequencies of some alleles in a population’s gene pool must change over successive generations.
iv. The frequencies of each allele in a population's gene pool must remain constant over successive generations.
  • A
    Statement (iii) is correct.
  • B
    Statement (vi) is correct.
  • C
    Statement (ii) is correct.
  • D
    Statement (i) is correct
Answer
(a) Statement (iii) is correct.
Explanation: Evolution may be described as the change in heritable characteristics of a population over successive generation.
So, for evolution to occur, allele frequency must change for whole group of population over successive generation.
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MCQ 111 Mark
Offspring formed as a result of sexual reproduction exhibit more variations because
  • A
    genetic material comes from two parents of different species
  • B
    genetic material comes from many parents
  • C
    sexual reproduction is a lengthy process
  • D
    genetic material comes from two parents of the same species
Answer
(d) genetic material comes from two parents of the same species
Explanation: Sexual reproduction involves two parents of the same species. Thus, both of them contribute to the
genetic material of the offspring and bring about the variations.
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MCQ 121 Mark
In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in $F _2$ is
  • A
    3 : 1
  • B
    1 : 1
  • C
    1 : 3
  • D
    2 : 1
Answer
(b) 1 : 1
Explanation: When purebred tall plant with the phenotype (TT) crossed with a short plant with the phenotype (tt), the possible
progeny in $F _2$ generation: TT(1), tt(1), and Tt(2). Thus the ratio of pure tall (TT) to pure short (tt) is 1:1.
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MCQ 131 Mark
The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one
  • A
    Salivary amylase
  • B
    Pepsin
  • C
    Mucus
  • D
    Bile
Answer
(c) Mucus
Explanation:A layer of mucus along the inner walls of the stomach is vital to protect the cell linings of that organ from the highly acidic environment within it.
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MCQ 141 Mark
IUPAC names of a few esters are given below:
i. Ethyl propanoate
ii. Propyl methanoate
iii. Methyl butanoate
iv. Ethyl butanoate
The ester(s) which contain(s) ten hydrogen atoms per molecule is/are
  • A
    (i) and (ii) only
  • B
    (iv) only
  • C
    (i) and (iii) only
  • D
    (i) only
Answer
(c) (i) and (iii) only
Explanation: 5, 6 or 7
Ethyl propanoate : $CH_3 CH_2 COOCH_2 CH_3$ ( 10 H atoms)
Propyl methanoate : $HCOOCH_2 CH_2 CH_3$ (8 H atoms)
Methyl butanoate : $CH_3 CH_2 CH_2 COOCH_3$ ( 10 H atoms)
Ethyl butanoate : $CH_3 CH_2 CH_2 COOCH_2 CH_3$ ( 12 H atoms)
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MCQ 151 Mark
The number of electrons in the outermost shell of the atom of a non-metal can be:
  • A
    1, 2 or 3
  • B
    5, 6 or 8
  • C
    3, 4 or 5
  • D
    5, 6 or 7
Answer
(d) 5, 6 or 7
Explanation: 5, 6 or 7
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MCQ 161 Mark
The slag obtained during the extraction of copper pyrites is composed mainly of:

Image
  • A
    $Cu _2 S$
  • B
    $SiO _2$
  • C
    $CuSiO _3$
  • D
    $FeSiO _3$
Answer
(d) $FeSiO _3$
Explanation: The sulphide ore of copper-containing iron is mixed with silica before heating in a reverberatory furnace. Iron
oxide forms a slag of iron silicate $\left( FeSiO _3\right)$
The reaction is: $FeO + SiO _2 \rightarrow FeSiO _3$
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MCQ 171 Mark
Which of the following compounds contain carboxylic group?
  • A
    $CH _3- CH _2- CH _3$
  • B
    $CH _3 CH _2 COOH$
  • C
    $CH _3 COOC _2 H _5$
  • D
    $CH _3 CH _2 OH$
Answer
(b) $CH _3 CH _2 COOH$
Explanation: $CH _3 CH _2 COOH$ contains a carboxylic group. $CH _3 CH _2 OH$ contains an alcoholic group. $CH _3 COOC _2 H _5$ contains the ester group. $CH _3- CH _2- CH _3$ is an alkane.
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MCQ 181 Mark
Which of the following is used in the refining of petroleum to remove sulphur and other compounds?
  • A
    $HNO _3$
  • B
    NaOH
  • C
    HCl
  • D
    $H _2 SO _4$
Answer
(d) $H _2 SO _4$
Explanation: Sulphuric acid is used in refining of petroleum to remove sulphur and other impurities from it.
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MCQ 191 Mark
What happens when silver chloride is put under sunlight?
  • A
    Only silver metal is formed.
  • B
    Silver metal and hydrogen gas are formed.
  • C
    Silver metal and chlorine gas are formed
  • D
    Only hydrogen gas is formed.
Answer
(c) Silver metal and chlorine gas are formed.
Explanation: Silver metal and chlorine gas are formed
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MCQ 201 Mark
Which type of chemical reaction is shown in the given image?
Image
  • A
    Redox reaction
  • B
    Combination reaction
  • C
    Decomposition reaction
  • D
    Displacement reaction
Answer
(a) Redox reaction
Explanation: The chemical reaction in which the oxidation and reduction take place simultaneously is called a redox reaction.

Image
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