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Science M.C.Q. [1 M]

Model Paper 4 · Gujarat Board (GSEB) STD 9 (GSEB - English Medium). 16 questions.

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M.C.Q. [1 M]

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16 questions · auto-graded multiple-choice test.

MCQ 11 Mark
Induced breeding is used to increase the production of
  • A
    poultry birds
  • B
    draught animals
  • C
    cows
  • ✓
    fish
Answer
Correct option: D.
fish
(d) fish
Explanation: Induced breeding is an optimal effort to produce fish fry without considering the season. This technique is used
to produce fry of fish species that have or potentially have great economic significance for aquaculture, which do not reproduces spontaneously in captivity.
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MCQ 21 Mark
Which will not give a stable solution even when stirred for sometimes?
  • A
    Milk in water
  • B
    Common salt in water
  • ✓
    Egg albumin in water
  • D
    Sugar in water
Answer
Correct option: C.
Egg albumin in water
(c) Egg albumin in water
Explanation: Egg albumin in water will not give a stable solution. The protein in egg albumin coagulated to form a lump in
hot water.

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MCQ 31 Mark
To prepare iron sulphide, by heating a mixture of iron filings and sulphur powder, we should use a:
  • A
    copper dish
  • ✓
    china dish
  • C
    watch glass
  • D
    petri dish
Answer
Correct option: B.
china dish
(b) china dish
Explanation: China's dish is the right apparatus used for strong heating. So, china's dish is used for heating as it has a high melting point and does not react with sulphur.

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MCQ 41 Mark
In the plant cells, many substances important for life are stored in:
  • A
    plastids
  • B
    lysosomes
  • C
    mitochondria
  • ✓
    vacuoles
Answer
Correct option: D.
vacuoles
(d) vacuoles
Explanation: Vacuoles are storage sacs for solid otherwise liquid content. In the plant cells, it provides rigidity and turgidity to the cell. In single-celled organisms, vacuoles store food, e.g., Amoeba.

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MCQ 51 Mark
The tissue shown in the given figure is
Image
  • A
    Angular collenchyma, in which wall thickenings are present at the angles
  • ✓
    Xylem vessel that forms long channels for conduction of water and minerals
  • C
    Phloem parenchyma with abundant food reserve
  • D
    Scierenchyma, in which uniform wall thickenings are present
Answer
Correct option: B.
Xylem vessel that forms long channels for conduction of water and minerals
(b) Xylem vessel that forms long channels for conduction of water and minerals
Explanation: Figure shows Xylem vessel that forms long channels for conduction of water and minerals
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MCQ 61 Mark
A compound of carbon, hydrogen and nitrogen contains these elements in the ratio $9: 1:3.5$. If its molecular mass is $108$, what is the molecular formula?
  • A
    $C _2 HN _2$
  • B
    $C _2 H _2 N$
  • ✓
    $C _6 H _8 N_2$
  • D
    $C _3 H _4 N$
Answer
Correct option: C.
$C _6 H _8 N_2$
$C _6 H _8 N_2$
Ratio of elements $C, H$ and $N = 9 : 1 : 3.5$
Whole number ratio of elements $C, H$ and$ N = 18 : 2 : 7$
Element Ratio Atomic mass Atomic ratio Simplest atomic ratio
$C$ $18$ $12$ $\frac{18}{12}=1.5$ $1.5 \times 2 = 3$
$H$ $2$ $1$ $\frac{2}{1}=2$ $2 \times 2 = 4$
$N$ $7$ $14$ $\frac{7}{14}=0.5$ $0.5 \times 2 = 1$
Thus, empirical formula of the compound $= C_3H_4N$ Empirical formula mass of the compound
$ =12 \times 3+1 \times 4+1 \times 14=36+4+14=54$
$n=\frac{\text { Molecular mass }}{\text { Empirical formula mass }}=\frac{108}{54}=2 $
Molecular formula $= n\  \times$ empirical formula
$=\left(C_3 H_4 N\right)_2=C_6 H_8 N_2$
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MCQ 71 Mark
A ball is dropped onto the floor from a height of $20 m$. It rebounds to a height of $10 m$. If the ball is in contact with the floor for $0.1$ seconds, what is the average acceleration during contact?
  • A
    $142\ m s^-2$
  • ✓
    $338\ m s^-2$
  • C
    $564\  m s^-2$
  • D
    $285 \ m s^-2$
Answer
Correct option: B.
$338\ m s^-2$
Here height from which ball is dropped, $h =20 m$
Using $v ^2= u ^2+2 gh ; v ^2=2 gh (\because u =0)$or $v =\sqrt{2 g h}\ ($downward$)$
Ball rebounds to a height, $h ^{\prime}=10 m$
So, $0^2= v ^2-2 gh ^{\prime}$ or $v ^{\prime}=\sqrt{2 g h^{\prime}} \ ($upward$)$
Acceleration of the ball,$ a =\frac{\left(v^{\prime}-v\right)}{t}=\frac{\left[\sqrt{2 g h^{\prime}}-(-\sqrt{2 g h})\right]}{\frac{t}{t}}$
$\text { or } a =\frac{[\sqrt{2 \times 9.8 \times 10}+\sqrt{2 \times 9.8 \times 20}}{0.1} \simeq 338 ms^{-2}$
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MCQ 81 Mark
Three students used three different containers (A) (B) and (C) of different shapes, for finding the loss in weight of solid when dipped in water. On dipping a solid sphere in these containers they would observe that the loss in weight is
Image
  • A
    Minimum in [A]
  • B
    Maximum in [A]
  • C
    Maximum in [B]
  • ✓
    Same in all
Answer
Correct option: D.
Same in all
(d) Same in all
Explanation: Loss in weight depends on the liquid density and volume displaced (= volume immersed) and not on the shape of
the container.
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MCQ 91 Mark
Branched involuntary muscles fibres are found in
  • A
    ureters
  • B
    limbs
  • ✓
    heart
  • D
    tongue
Answer
Correct option: C.
heart
(c) heart
Explanation: Involuntary muscles are found in walls of hollow tubular organs like an alimentary canal, ducts of glands, urogenital ducts, and blood vessels except the heart. They show slow contractions but remain contracted for a long period of time.

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MCQ 101 Mark
Symbol of Iron is:-
  • A
    Ir
  • ✓
    Fe
  • C
    Mg
  • D
    I
Answer
Correct option: B.
Fe
(b) Fe
Explanation: Symbol "Fe" for Iron has been derived from the Latin word Ferrum.
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MCQ 111 Mark
Which among the following is concerned with the synthesis and transport of lipids within the cell?
  • ✓
    Smooth endoplasmic reticulum
  • B
    Lysosomes
  • C
    Rough endoplasmic reticulum
  • D
    Golgi apparatus
Answer
Correct option: A.
Smooth endoplasmic reticulum
(a) Smooth endoplasmic reticulum
Explanation: Smooth endoplasmic reticulum synthesises lipids while rough endoplasmic reticulum synthesise proteins.
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MCQ 121 Mark
Rhythmic contraction and relaxation throughout life, are shown by
  • A
    epithelium of lungs
  • B
    striated muscles of tongue
  • C
    striated muscles of limbs
  • ✓
    cardiac muscles of heart
Answer
Correct option: D.
cardiac muscles of heart
(d) cardiac muscles of heart
Explanation: Cardiac muscles are present in the heart. They contract and relax rapidly, rhythmically, and tirelessly. They help to pump the blood to various parts of the body.

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MCQ 131 Mark
Which of one of the following nutrients is not available in fertilisers.
  • ✓
    Iron
  • B
    Potassium
  • C
    Nitrogen
  • D
    Phosphorous
Answer
Correct option: A.
Iron
(a) Iron
Explanation: As iron is a micronutrient that is required mainly for enzyme activity and fertilisers are supplied mainly for replenishing macronutrients which help in plant growth.

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MCQ 141 Mark
In which of the following cases of motion, the distance moved and the magnitude of displacement are equal?
  • A
    The earth is revolving around the Sun
  • B
    The pendulum is moving to and fro
  • ✓
    A car is moving on a straight road
  • D
    A car is moving in a circular path
Answer
Correct option: C.
A car is moving on a straight road
(c) A car is moving on a straight road
Explanation: The distance moved and magnitude of displacement are equal only in the case of motion along a straight line.
Because displacement is the shortest path between initial and find path. So, for car moving on straight road, distance moved and magnitude of displacement are equal.

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MCQ 151 Mark
Which of the following acts as a garbage disposal system of the cell?
  • A
    Vacuole
  • ✓
    Lysosome
  • C
    Peroxisome
  • D
    Golgi body
Answer
Correct option: B.
Lysosome
(b) Lysosome
Explanation: The lysosome is a membrane-bound organelle found in nearly all animal cells. They are spherical vesicles that
contain hydrolytic enzymes that can break down many kinds of biomolecules. It is also known as suicidal bags or the Garbage
disposal system as it cleans the degenerating cells inside the body.

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MCQ 161 Mark
The temperature-time graph given alongside shows the heating curve for pure wax.
Image
What is the melting point of the substance?
  • A
    110°C
  • B
    90°C
  • C
    9°C
  • ✓
    15°C
Answer
Correct option: D.
15°C
(d) 15°C
Explanation: The melting point is the temperature at which solid and liquid are in equilibrium. It is the temperature above
which a solid melts to a liquid, or the temperature below which a liquid freezes to a solid.
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