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Science M.C.Q. [1 M]

Gravitation · MP Board (MPBSE) STD 9 (Madhya Pradesh - English Medium). 173 questions.

Questions · Page 2 of 4

M.C.Q. [1 M]

MCQ 511 Mark
Communication satellites move in $44400\ km$ around the earth. Assume that the only force acting on it is that due to the earth, then what is acceleration of such a satellite? (Take, mass of earth $= 6 \times 10^{24}kg)$
  • A
    $0.3m/ s^2$
  • ✓
    $0.2m/ s^2$
  • C
    $0.4m/ s^2$
  • D
    $0.5m/ s^2$
Answer
Correct option: B.
$0.2m/ s^2$
$0.2m/ s^2$
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MCQ 521 Mark
A tank $5\ m$ is high filled with water and then is filled to the top with oil of density $0.85g/ cm^3$. Then bottom of the tank, due to these liquids is:
  • A
    $1.85dyne/ cm^2$
  • B
    $89.25dyne/ cm^2$
  • ✓
    $462.5dyne/ cm^2$
  • D
    $500dyne/ cm^2$
Answer
Correct option: C.
$462.5dyne/ cm^2$
$462.5dyne/ cm^2$
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MCQ 531 Mark
Which of the following is involved in buoyancy:
  • A
    Solids
  • B
    Liquids
  • C
    Gases
  • ✓
    Both $B$ and $C$
Answer
Correct option: D.
Both $B$ and $C$
Both $B$ and $C$
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MCQ 541 Mark
Which Newton's laws describe thrust:
  • A
    First and Second
  • ✓
    Second and Third
  • C
    Only Second
  • D
    First and Third
Answer
Correct option: B.
Second and Third
(b) Second and Third
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MCQ 551 Mark
The force of gravitation exists:
  • A
    Only at the surface of the earth
  • ✓
    Everywhere in the universe
  • C
    Only inside the earth
  • D
    Only at the surface of the moon
Answer
Correct option: B.
Everywhere in the universe
(b) Everywhere in the universe
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MCQ 561 Mark
Two objects of different masses falling freely near the surface of moon would:
  • A
    Have different accelerations.
  • B
    Undergo a change in their inertia.
  • ✓
    Have same velocities at any instant.
  • D
    Experience forces of same magnitude.
Answer
Correct option: C.
Have same velocities at any instant.
(c) Have same velocities at any instant.
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MCQ 571 Mark
Choose the correct statement:
  • A
    Gravity and gravitation are same
  • ✓
    Gravity is a particular case of gravitation
  • C
    Acceleration due to gravity is a scalar quantity
  • D
    Different heavenly bodies have different values of G
Answer
Correct option: B.
Gravity is a particular case of gravitation
(b) Gravity is a particular case of gravitation
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MCQ 581 Mark
Which of the following has highest relative density:
  • A
    Water
  • B
    Oil
  • ✓
    Mercury
  • D
    Glass
Answer
Correct option: C.
Mercury
(c) Mercury
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MCQ 591 Mark
In the relation $\text{F}=\text{G}\times\text{M}\times\frac{\text{m}}{\text{d}^2},$ the quantity $G:$
  • A
    Depends on the value of g at the place of observation.
  • B
    Is used only when the earth is one of the two masses.
  • C
    Is the greatest on the surface of the earth.
  • ✓
    Is of the same value irrespective of the place of observation.
Answer
Correct option: D.
Is of the same value irrespective of the place of observation.
Is of the same value irrespective of the place of observation.
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MCQ 601 Mark
Why do we weight less on moon as compared to earth ?
  • A
    Because moons gravitational force is less.
  • B
    Because moon weight less.
  • ✓
    Because moon has less mass compared to earth.
  • D
    Because is space our weight is reduced.
Answer
Correct option: C.
Because moon has less mass compared to earth.
(c) Because moon has less mass compared to earth.
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MCQ 611 Mark
Why is relative density calculated with respect to the density of water particularly at $4^{\circ} \mathrm{C}$?
  • A
    Because water displays Archimedes principle at $4^{\circ} \mathrm{C}$
  • ✓
    Water has the highest density at $4^{\circ} \mathrm{C}$
  • C
    Water starts turning into ice at $4^{\circ} \mathrm{C}$
  • D
    All of the above
Answer
Correct option: B.
Water has the highest density at $4^{\circ} \mathrm{C}$
(b) Water has the highest density at $4^{\circ} \mathrm{C}$
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MCQ 621 Mark
Any solid will sink in water, if its relative density is:
  • A
    less than unity
  • B
    Equal to unity
  • ✓
    Greater than unity
  • D
    zero
Answer
Correct option: C.
Greater than unity
(c) Greater than unity
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MCQ 641 Mark
If the weight of an object in air and a dense liquid are $W_a$ and $W_l$ respectively, then upthrust:
  • ✓
    $W_a-W_l$
  • B
    $U=W_l+W_a$
  • C
    $U=W_l-W_a$
  • D
    $U=2 W_1$
Answer
Correct option: A.
$W_a-W_l$
(a) $W_a-W_l$
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MCQ 651 Mark
When a solid is completely immersed in a fluid, the apparent loss of weight of solid is _______ weight of fluid displaced:
  • A
    More than
  • B
    Less than
  • ✓
    Equal to
  • D
    Cant say
Answer
Correct option: C.
Equal to
(c) Equal to
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MCQ 661 Mark
The force of attraction between two unit point masses separated by a unit distance is called:
  • A
    Gravitational potential.
  • B
    Acceleration due to gravity.
  • C
    Gravitational field strength.
  • ✓
    Universal gravitational constant.
Answer
Correct option: D.
Universal gravitational constant.
(d) Universal gravitational constant.
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MCQ 671 Mark
Gravitational force acts
  • A
    Only between the sun and the planets moving around it.
  • B
    Only between the earth and the bodies on it.
  • ✓
    Between all bodies in the universe.
  • D
    Only between the Sun and the earth.
Answer
Correct option: C.
Between all bodies in the universe.
(c) Between all bodies in the universe.
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MCQ 681 Mark
The value of g on the surface of the moon:
  • A
    Is the same as on the earth.
  • ✓
    Is less than that on the earth.
  • C
    Is more than that on the earth.
  • D
    Keeps changing day by day.
Answer
Correct option: B.
Is less than that on the earth.
(b) Is less than that on the earth.
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MCQ 691 Mark
The value of quantity 'G' in the law of gravitation:
  • A
    Depends on mass of earth only
  • B
    Depends on radius of earth only
  • C
    Depends on both mass and radius of earth
  • ✓
    Is independent of mass and radius of the earth
Answer
Correct option: D.
Is independent of mass and radius of the earth
(d) Is independent of mass and radius of the earth
Explaination : G is the universal constant of gravity, which doesn’t depends on mass and radius of the earth.
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MCQ 701 Mark
An apple of mass $100g$ falls from a tree because of gravitational attraction between the earth and the apple. If the magnitude of force exerted by the earth on the apple be $F_1$, and the magnitude of force exerted by the apple on the earth be $F_2$, then:
  • A
    $F_1$ is very much greater than $F_2$
  • B
    $F_2$ is very much greater than $F_1$
  • C
    $F_1$ is only a little greater than $F_2$
  • ✓
    $F_1$ and $F_2$​​​​​​ are exactly equal.
Answer
Correct option: D.
$F_1$ and $F_2$​​​​​​ are exactly equal.
$F_1$ and $F_2$​​​​​​ are exactly equal.
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MCQ 711 Mark
State the $S.I$. units of mass and weight:
  • A
    $G$ and kg
  • B
    $Kg$ and $g$
  • ✓
    $Kg$ and $N$
  • D
    $N$ and $kg$
Answer
Correct option: C.
$Kg$ and $N$
$Kg$ and $N$
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MCQ 721 Mark
Buoyant force is exerted by:
  • A
    Only solids
  • B
    Only liquids
  • ✓
    All fluids
  • D
    All the above
Answer
Correct option: C.
All fluids
(c) All fluids
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MCQ 731 Mark
The gravitational force between two bodies is
  • A
    Repulsive at large distances
  • ✓
    Attractive at all places
  • C
    Attractive at short distances
  • D
    Repulsive at short distances
Answer
Correct option: B.
Attractive at all places
(b) Attractive at all places
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MCQ 741 Mark
Buoyant force exerted by a fluid on a given body is:
  • A
    Equal to the volume of body
  • B
    Equal to the weight of body
  • ✓
    Equal to the volume of fluid displaced by the body
  • D
    Equal to the weight of fluid displaced by the body
Answer
Correct option: C.
Equal to the volume of fluid displaced by the body
(c) Equal to the volume of fluid displaced by the body
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MCQ 751 Mark
In the relation $F = GM \frac{\text{m}}{\text{d}_2}$ , the quantity:
  • A
    Depends on the value of g at the place of observation.
  • B
    Is used only when the earth is one of the two masses.
  • C
    Is greatest at the surface of the earth.
  • ✓
    Is universal constant of nature.
Answer
Correct option: D.
Is universal constant of nature.
Is universal constant of nature.
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MCQ 761 Mark
The force that keeps the body in a circular path and is acting towards the center is called?
  • A
    Central force
  • B
    Frictional Force
  • ✓
    Centripetal Force
  • D
    $A$ and $C$
Answer
Correct option: C.
Centripetal Force
(c) Centripetal Force
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MCQ 771 Mark
which is a correct statement about mass ?
  • A
    Mass can be zero.
  • B
    Mass is vector quantity.
  • ✓
    Mass is constant everywhere.
  • D
    Mass is derived quantity.
Answer
Correct option: C.
Mass is constant everywhere.
(c) Mass is constant everywhere.
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MCQ 781 Mark
A wooden block of volume $1000cm^3$ is suspended from a spring balance. It weighs $12\ N$ in air. It is suspended in water such that half of the block is below the water. The reading of the spring balance is:
  • A
    $10\ N$
  • B
    $9\ N$
  • C
    $EN$
  • ✓
    $7\ N$
Answer
Correct option: D.
$7\ N$
$7\ N$
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MCQ 791 Mark
The acceleration due to gravity is zero at ______.
  • A
    The equator
  • B
    Poles
  • C
    Sea level
  • ✓
    The centre of the earth
Answer
Correct option: D.
The centre of the earth
(d) The centre of the earth
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MCQ 801 Mark
An object having mass equal to $350\ g$ occupies $200\ cm^3$ of the space. When this object is thrown into a river what will be the condition of this object there? (Density of water $= 1g/ cm^3$)
  • A
    It will float on the surface of water.
  • B
    It will float fully submerged in the liquid.
  • ✓
    It will sink in the liquid.
  • D
    It will float partially submerged in the liquid.
Answer
Correct option: C.
It will sink in the liquid.
It will sink in the liquid.
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MCQ 811 Mark
Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be:
  • A
    $\frac{1}{4}$ times
  • ✓
    $4$ times
  • C
    $\frac{1}{2}$ times
  • D
    Unchanged
Answer
Correct option: B.
$4$ times
$4$ times
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MCQ 821 Mark
To find the density of a liquid, a student used the following steps. The sequence of steps followed is given. Identify the wrong step.
$A :$ Collected displaced volume of water to know the volume $V$ of immersed body.
$B :$ Found the weight $(W)$ of the body in air
$C :$ Found the weight $W_l$, of the body in water when immersed completely.
$D :$ Found $\frac{\text{W}}{\text{V}}$ to get the result.
  • A
    $A$
  • B
    $B$
  • C
    $C$
  • ✓
    $D$
Answer
Correct option: D.
$D$
$D$
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MCQ 831 Mark
Specific gravity of substance is:
  • A
    Density of substance relative to density of air
  • ✓
    Density of substance relative to density of water
  • C
    Density of substance relative to density of hydrogen
  • D
    None of these
Answer
Correct option: B.
Density of substance relative to density of water
(b) Density of substance relative to density of water
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MCQ 841 Mark
The value of acceleration due to gravity of earth:
  • A
    Is the same on equator and poles.
  • B
    Is the least on poles.
  • ✓
    Is the least on equator.
  • D
    Increases from pole to equator.
Answer
Correct option: C.
Is the least on equator.
(c) Is the least on equator.
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MCQ 851 Mark
The S.I. units of thrust is same as that of:
  • A
    Force/ Area
  • B
    Force x Area
  • ✓
    Force
  • D
    None of these
Answer
Correct option: C.
Force
(c) Force
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MCQ 861 Mark
Which of the following is true for relative density?
  • A
    It is a ratio of density of an object to that of water
  • B
    It has no unit
  • C
    Relative density water is $1$
  • ✓
    All of the above
Answer
Correct option: D.
All of the above
All of the above
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MCQ 871 Mark
A body is floating in water with $\frac{2}{3}$ of its volume below the surface of water. What is the density of body?
  • ✓
    $666.7\ kg/m^3$
  • B
    $777.6\ kg/ m^3$
  • C
    $656.7\ kg/ m^3$
  • D
    $876.6\ kg/ m^3$
Answer
Correct option: A.
$666.7\ kg/m^3$
$666.7\ kg/m^3$
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MCQ 881 Mark
Thrust is a _______ quantity.
  • ✓
    Vector
  • B
    Scalar
  • C
    Both $A$ and $B$
  • D
    Can't say
Answer
Correct option: A.
Vector
Vector
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MCQ 901 Mark
Which of the following statement is true:
  • A
    $G$ is same at all places on the surface of earth.
  • B
    $G$ has its maximum value at the equator.
  • C
    $G$ is less at the earth's surface than at a height above it or a depth below it.
  • ✓
    $G$ is greater at the poles than at the equator.
Answer
Correct option: D.
$G$ is greater at the poles than at the equator.
$G$ is greater at the poles than at the equator.
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MCQ 911 Mark
The force of attraction between two unit point masses separated by a unit distance is called:
  • A
    Gravitational potential
  • B
    Acceleration due to gravity
  • C
    Gravitational field
  • ✓
    Universal gravitational constant
Answer
Correct option: D.
Universal gravitational constant
(d) Universal gravitational constant
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MCQ 921 Mark
What is $G$
  • A
    Gravitation.
  • ✓
    Acceleration due to gravity.
  • C
    Constant of Proportionality.
  • D
    $A$ or $C$
Answer
Correct option: B.
Acceleration due to gravity.
Acceleration due to gravity.
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MCQ 931 Mark
When a body is fully immersed in a liquid the apparent loss in the weight of body is equal to:
  • A
    Volume of liquid displaced by the body
  • B
    Density of the liquid
  • ✓
    Weight of liquid displaced by the body
  • D
    None of these
Answer
Correct option: C.
Weight of liquid displaced by the body
(c) Weight of liquid displaced by the body
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MCQ 941 Mark
Which among the following is not the property of weight:
  • A
    It is the force of gravity acting on a body
  • B
    It is measured by a spring balance
  • C
    It is variable and changes with the change in acceleration due to gravity
  • ✓
    Its S.I unit is kg
Answer
Correct option: D.
Its S.I unit is kg
(d) Its S.I unit is kg
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MCQ 951 Mark
The upward force acting on the body immersed in a fluid is called:
  • A
    Equilibrium force
  • ✓
    Buoyant force
  • C
    True weight
  • D
    Net force
Answer
Correct option: B.
Buoyant force
(b) Buoyant force
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MCQ 961 Mark
When a solid block is fully immersed in water, the volume of the water displaced is:
  • A
    Greater than the volume ofthe block
  • B
    Less than the volume of the block
  • ✓
    Equal to the volume of the block
  • D
    Depends upon the manner in which the block is immersed in the liquid
Answer
Correct option: C.
Equal to the volume of the block
(c) Equal to the volume of the block
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MCQ 971 Mark
Newton's law of gravitation holds good for:
  • A
    Only small bodies
  • B
    Only terrestrial bodies
  • C
    Only big bodies
  • ✓
    all types of bodies
Answer
Correct option: D.
all types of bodies
(d) all types of bodies
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MCQ 991 Mark
The liquid in which iron can float is:
  • A
    Water
  • B
    Kerosene
  • ✓
    Mercury
  • D
    Glycerine
Answer
Correct option: C.
Mercury
(c) Mercury
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MCQ 1001 Mark
The weight of an object at the centre of the earth of radius R is:
  • ✓
    Zero.
  • B
    R times the weight at the surface of the earth.
  • C
    Infinite.
  • D
    $\frac{1}{\text{R}^2}$ times the weight at the surface of the earth.
Answer
Correct option: A.
Zero.
(a) zero
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