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Science M.C.Q. [1 M]

Gravitation · Bihar Board (BSEB) STD 9 (BSEB - English Medium). 173 questions.

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M.C.Q. [1 M]

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MCQ 11 Mark
If the distance between two masses be doubled, then the force between will become:
  • ✓
    $\frac{1}{4}$times
  • B
    4 times
  • C
    $\frac{1}{2}$times
  • D
    2 times
Answer
Correct option: A.
$\frac{1}{4}$times
(a) $\frac{1}{4}$times
Explaination : $
F_g=G \frac{m_1 m_2}{r^2}
$
Therefore, $F _{ g } \propto \frac{1}{ r ^2}$
Hence, if the distance between the bodies is doubled, the gravitational force of attraction becomes one-fourth.
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MCQ 21 Mark
The gravitational attraction between the two bodies increases when their masses are:
  • A
    Reduced and distance is reduced
  • ✓
    Increased and distance is reduced
  • C
    Reduced and distance is increased
  • D
    Increased and distance is increased
Answer
Correct option: B.
Increased and distance is reduced
b. Increased and distance is reduced
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MCQ 31 Mark
A body is brought from the earth to the moon is ___?
  • A
    Mass will change
  • ✓
    Weight will change
  • C
    Mass and weight will change
  • D
    Both mass and weight will change
Answer
Correct option: B.
Weight will change
(b) Weight will change
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MCQ 41 Mark
A ball weighing $4\ kg$ of density $4000\ kg m^{-3}$ is completely immersed in water of density $103\ kg m^{-3}$. What will be the buoyant force acting on it?
  • A
    $100\ N$
  • ✓
    $10\ N$
  • C
    $1600\ N$
  • D
    $16\ N$
Answer
Correct option: B.
$10\ N$
$10\ N$
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MCQ 51 Mark
Weight is:
  • ✓
    Measured by spring balance
  • B
    Measured by beam balance
  • C
    Measured in kg
  • D
    A scalar quantity
Answer
Correct option: A.
Measured by spring balance
(a) Measured by spring balance
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MCQ 61 Mark
What will be the weight of a person on earth, who weights $9N$ on the moon?
  • A
    $3\ N$
  • B
    $15\ N$
  • C
    $45\ N$
  • ✓
    $54\ N$
Answer
Correct option: D.
$54\ N$
$54\ N$
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MCQ 71 Mark
Archimedes' principle states that the buoyant force applied to an object
  • A
    Is greater the weight of the fluid the object displaces
  • ✓
    Is equal to the weight of the fluid the object displaces
  • C
    Is less than the weight of the fluid the object displaces
  • D
    Is zero
Answer
Correct option: B.
Is equal to the weight of the fluid the object displaces
(b) Is equal to the weight of the fluid the object displaces
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MCQ 81 Mark
A metal in which even iron can float is:
  • A
    Sodium.
  • B
    Magnesium.
  • ✓
    Mercury.
  • D
    Manganese.
Answer
Correct option: C.
Mercury.
(c) Mercury.
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MCQ 91 Mark
Mass is a _______ quantity and weight is a _______ quantity:
  • ✓
    Scalar, vector
  • B
    Vector, scalar
  • C
    Tensor, scalar
  • D
    Vector, vector
Answer
Correct option: A.
Scalar, vector
(a) Scalar, vector
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MCQ 101 Mark
If the gravitational force of earth suddenly disappears, then which of the following is correct:
  • ✓
    Weight of the body is zero
  • B
    Mass of the body is zero
  • C
    Both mass and weight become zero
  • D
    Neither the weight nor the mass is zero
Answer
Correct option: A.
Weight of the body is zero
(a) Weight of the body is zero
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MCQ 111 Mark
The force of gravitation between two bodies does not depend upon:
  • A
    The separation between them
  • B
    The gravitational constant
  • C
    The product of their masses
  • ✓
    The sum of their masses
Answer
Correct option: D.
The sum of their masses
(d) The sum of their masses
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MCQ 121 Mark
The universal Law of Gravitation explained:
  • A
    The tides due to moon and the sun.
  • B
    The force that binds us to the earth.
  • C
    The motion of the planets around the sun.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
(d) All of the above.
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MCQ 131 Mark
Moon is revolving in a circular orbit with a uniform velocity V0​. If the gravitational force suddenly disappears, the moon will
  • A
    Continue to move in the same orbit
  • ✓
    Move with a velocity V0​ tangentially to the orbit
  • C
    Fall down freely
  • D
    Ultimately comes to rest
Answer
Correct option: B.
Move with a velocity V0​ tangentially to the orbit
(b) Move with a velocity V0​ tangentially to the orbit
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MCQ 141 Mark
In the relation $F = G$ Mm/ do, 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 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 151 Mark
The cause of floating of clouds in atmosphere is:
  • A
    Low viscosity.
  • B
    Low temperature.
  • C
    Low pressure.
  • ✓
    Low density.
Answer
Correct option: D.
Low density.
(d) Low density.
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MCQ 161 Mark
The value of g on moon in $1/ 6 th$ of the value of g on earth. A man can jump $1.5\ m$ high on the earth. He can jump on the moon up to a height of:
  • ✓
    $9\ m$
  • B
    $7.5\ m$
  • C
    $6\ m$
  • D
    $4.5\ m$
Answer
Correct option: A.
$9\ m$
$9\ m$
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MCQ 171 Mark
When a body is going upwards vertically the acceleration due to gravity is taken as
  • A
    Positive
  • ✓
    Negative
  • C
    Both $A$ and $B$
  • D
    Uncertain
Answer
Correct option: B.
Negative
 Negative
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MCQ 181 Mark
Which of the following physical quantities has no unit:
  • ✓
    Relative density
  • B
    Density
  • C
    Pressure
  • D
    Thrust
Answer
Correct option: A.
Relative density
(a) Relative density
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MCQ 191 Mark
A force of $50\ N$ is applied on a nail of area $0.001$sqcm.Then the thrust on the nail is equal to:
  • ✓
    $50\ N$
  • B
    $100\ N$
  • C
    $0.05\ N$
  • D
    $10\ N$
Answer
Correct option: A.
$50\ N$
$50\ N$
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MCQ 201 Mark
An apple falls from a tree because of the gravitational attraction between the earth and the apple. If $\mathrm F_1$ is the magnitude of the force exerted by the earth on the apple and $\mathrm F_2$ is the magnitude of the force exerted by the apple on the earth, then:
  • A
    $\mathrm F_1$ is very much greater than $\mathrm F_2$
  • B
    $\mathrm F_2$is very much greater than $\mathrm F_1$
  • ✓
    $\mathrm F_1$and $\mathrm F_2$are equal
  • D
    $\mathrm F_1$ is only a little greater than $\mathrm F_2$
Answer
Correct option: C.
$\mathrm F_1$and $\mathrm F_2$are equal
$\mathrm F_1$ and $\mathrm F_2$ are equal
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MCQ 211 Mark
Who derived the Universal Law for Gravitation:
  • ✓
    Newton
  • B
    Galileo
  • C
    Kepler
  • D
    Einstein
Answer
Correct option: A.
Newton
(a) Newton
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MCQ 221 Mark
Consider the following information in respect of four objects $A, B, C$ and $D:$
Object Density (kg/m$^3$) Volume (m$^3$) Mass (kg)
$A$ - $2$ $4000$
$B$ $8000$ $4$ -
$C$ $2000$ - $1000$
$D$ - $4$ $2000$
Which object would float on water?
  • A
    $A$
  • B
    $B$
  • C
    $C$
  • ✓
    $D$
Answer
Correct option: D.
$D$
$D$
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MCQ 231 Mark
During a planned manoeuvre in a space flight, a free-floating astronaut $A$ pushes another free floating astronaut $B$, the mass of $A$ being greater than that of $B$. Then, during a push
  • A
    The acceleration of $A$ is greater than that of $B$
  • ✓
    The acceleration of $A$ is less than that of $B$
  • C
    Neither is accelerated
  • D
    Their accelerations are equal in magnitude but opposite in direction
Answer
Correct option: B.
The acceleration of $A$ is less than that of $B$
The acceleration of $A$ is less than that of $B$
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MCQ 241 Mark
An object can be completely immersed in a liquid when:
  • A
    The upward and downward forces are balanced.
  • B
    The downward force is more than the upward force.
  • ✓
    Both $A$ and $B$
  • D
    None of the above
Answer
Correct option: C.
Both $A$ and $B$
Both $A$ and $B$
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MCQ 251 Mark
If the weight of a body is $6\ N$ on the moon, what will it be on the earth:
  • A
    $6\ N$
  • ✓
    $36\ N$
  • C
    $12\ N$
  • D
    $1\ N$
Answer
Correct option: B.
$36\ N$
$36\ N$
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MCQ 261 Mark
What is known as thrust:
  • ✓
    Force orthogonal to an area
  • B
    Force acting along an area
  • C
    Any force
  • D
    None of these
Answer
Correct option: A.
Force orthogonal to an area
(a) Force orthogonal to an area
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MCQ 271 Mark
Why does a mug full of water feel lighter inside water:
  • ✓
    Because of Buoyant force
  • B
    Because of Gravitational force
  • C
    Because of an increase in velocity
  • D
    Because of its kinetic energy
Answer
Correct option: A.
Because of Buoyant force
(a) Because of Buoyant force
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MCQ 281 Mark
If a satellite is revolving around a planet of mass $M$ in an elliptical orbit of semi-major axis a, find the orbital speed of the satellite when it is at a distance r from the focus.
  • ✓
    $\text{v}^2=\text{GM}\Big[\frac{2}{\text{r}}-\frac{1}{\text{a}}\Big]$
  • B
    $\text{v}^2=\text{GM}\Big[\frac{2}{\text{r}^2}-\frac{1}{\text{a}}\Big]$
  • C
    $\text{v}^2=\text{GM}\Big[\frac{2}{\text{r}^2}-\frac{1}{\text{a}^2}\Big]$
  • D
    $\text{v}^2=\text{G}\Big[\frac{2}{\text{r}}-\frac{1}{\text{a}}\Big]$
Answer
Correct option: A.
$\text{v}^2=\text{GM}\Big[\frac{2}{\text{r}}-\frac{1}{\text{a}}\Big]$
(a) $\text{v}^2=\text{GM}\Big[\frac{2}{\text{r}}-\frac{1}{\text{a}}\Big]$
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MCQ 291 Mark
What is the source of centripetal force that a planet requires to revolve around the Sun?
  • ✓
    Gravitational force
  • B
    Electrical force
  • C
    Magnetic force
  • D
    Atomic force
Answer
Correct option: A.
Gravitational force
(a) Gravitational force
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MCQ 301 Mark
Four students $A, B, C$ and $D$ find the acceleration due to gravity at the top of Ooty, Nainital, Mount Everest and Shimla. The acceleration due to gravity is the least:
  • A
    At Ooty since it is the highest.
  • ✓
    At Mount Everest as it is the highest.
  • C
    At Nainital as only latitude has the effect and not height of the peak.
  • D
    At Shimla as it is the coldest
Answer
Correct option: B.
At Mount Everest as it is the highest.
At Mount Everest as it is the highest.
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MCQ 311 Mark
An object is thrown vertically upwards with a velocity u, the greatest height h to which it will rise before falling back is given by:
  • A
    $\frac{\mu}{\text{g}}$
  • ✓
    $\frac{\mu^2}{2\text{g}}$
  • C
    $\frac{\mu^2}{\text{g}}$
  • D
    $\frac{\mu}{2\text{g}}$
Answer
Correct option: B.
$\frac{\mu^2}{2\text{g}}$
(b) $\frac{\mu^2}{2\text{g}}$
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MCQ 321 Mark
What do you mean by Thrust or Buoyant force?
  • ✓
    The upward force exerted by liquid when a body is immersed in the liquid.
  • B
    The downward force exerted by liquid when a body is immersed in the liquid.
  • C
    The upward force exerted by body when a body is immersed in the liquid.
  • D
    The downward force exerted by body when a body is immersed in the liquid.
Answer
Correct option: A.
The upward force exerted by liquid when a body is immersed in the liquid.
(a) The upward force exerted by liquid when a body is immersed in the liquid.
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MCQ 331 Mark
Which of the following is not true for Universal law of gravitation:
  • A
    It is the gravitational force between the sun and the earth, which makes the earth move around the sun.
  • B
    The tides formed in sea are because of gravitational pull exerted by the sun and the moon on the surface of water.
  • C
    It is the gravitational pull of the earth which keeps us and other bodies firmly on the ground.
  • ✓
    The gravitational force exerted by sun on earth is larger than that exerted by earth on sun.
Answer
Correct option: D.
The gravitational force exerted by sun on earth is larger than that exerted by earth on sun.
(d) The gravitational force exerted by sun on earth is larger than that exerted by earth on sun.
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MCQ 341 Mark
The value of acceleration due to gravity:
  • A
    Is same on equator and poles.
  • B
    Is least on poles.
  • ✓
    Is least on equator.
  • D
    Increases from pole to equator.
Answer
Correct option: C.
Is least on equator.
(c) Is least on equator.
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MCQ 351 Mark
An object weighs $10\ N$ in air. When immersed fully in a liquid, it weighs only $8\ N$. The weight of liquid displaced by the object will be:
  • ✓
    $2\ N$
  • B
    $8\ N$
  • C
    $10\ N$
  • D
    $12\ N$
Answer
Correct option: A.
$2\ N$
$2\ N$
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MCQ 361 Mark
The relative densities of four liquids $P, Q, R$ and $S$ are $1.26, 1.0, 0.84$ and $13.6$ respectively. An object is floated in all these liquids, one by one. In which liquid the object will float with its maximum volume submerged under the liquid?
  • A
    $P$
  • B
    $Q$
  • ✓
    $R$
  • D
    $S$
Answer
Correct option: C.
$R$
$R$
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MCQ 381 Mark
The atmosphere consisting of a large number of gases is held to the earth by:
  • A
    Winds.
  • B
    Clouds.
  • C
    Earth's magnetic field.
  • ✓
    Gravity.
Answer
Correct option: D.
Gravity.
(d) Gravity.
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MCQ 391 Mark
Buoyant force is directed:
  • ✓
    Upwards
  • B
    Downwards
  • C
    Sideways
  • D
    At ll directions
Answer
Correct option: A.
Upwards
(a) Upwards
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MCQ 401 Mark
Which among the following is a wrong differentiation between mass and weight ?
  • A
    Mass is amount of matter in a body whereas weight is the measure of force acting on body.
  • ✓
    Si unit of mass is kg whereas SI unit of weight is newton.
  • C
    Mass has both magnitude and direction whereas weight has only direction.
  • D
    Mass can easily be measured by beam balance whereas weight can be measured by spring balance.
Answer
Correct option: B.
Si unit of mass is kg whereas SI unit of weight is newton.
(b) Si unit of mass is kg whereas SI unit of weight is newton.
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MCQ 411 Mark
If the mass of a body is $M$ on the surfrace of the earth, then its mass on the surface of the moon will be:
  • A
    $\frac{\text{M}}{6}$
  • ✓
    $M$
  • C
    $M + 6$
  • D
    Zero
Answer
Correct option: B.
$M$
Mass of a body is a constant quantity whereas its weight is a variable quantity. Mass does not depend on the acceleration due to gravity. Hence mass of that body on the surface of moon is also $M.$
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MCQ 421 Mark
When a body is taken from the earth to the moon:
  • A
    Its weight increases
  • ✓
    Its weight decreases
  • C
    Its weight remains unchanged
  • D
    It becomes completely weightless
Answer
Correct option: B.
Its weight decreases
(b) Its weight decreases
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MCQ 431 Mark
The total force exerted by a body perpendicular to a surface is called.
  • A
    Pressure
  • ✓
    Thrust
  • C
    Impulse
  • D
    Collision
Answer
Correct option: B.
Thrust
(b) Thrust
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MCQ 441 Mark
An earth-like planet has a radius equal to double the earth's radius. The acceleration due to gravity on its surface will be:
  • A
    $\text{g}$
  • B
    $\frac{\text{g}}{2}$
  • ✓
    $\frac{\text{g}}{4}$
  • D
    $\text{g}^2$
Answer
Correct option: C.
$\frac{\text{g}}{4}$
(c) $\frac{\text{g}}{4}$
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MCQ 451 Mark
An apple falls from a tree because of gravitational attraction between the earth and apple. If is the magnitude of force exerted by the earth on the apple and $\mathrm{f}_2$ is the magnitude of force exerted by apple on earth, then:
  • A
    $F,$ is very much greater than $F_2$.
  • B
    $F_2$ is very much greater than $F,$
  • C
    $F,$ is only a little greater than $F_2$.
  • ✓
    $F_1$ and $F_2$ are equal.
Answer
Correct option: D.
$F_1$ and $F_2$ are equal.
$F_1$ and $F_2$ are equal.
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MCQ 461 Mark
What is the relation between thrust and pressure?
  • ✓
    Pressure directly proportional to thrust
  • B
    Pressure indirectly proportional to thrust
  • C
    No relation
  • D
    None
Answer
Correct option: A.
Pressure directly proportional to thrust
(a) Pressure directly proportional to thrust
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MCQ 471 Mark
The weight of a boy on the surface of the moon is $300\ N$.The weight of this boy on the surface of the earth is:
  • A
    $300\ N$
  • B
    $5\ N$
  • C
    $50\ N$
  • ✓
    $1800\ N$
Answer
Correct option: D.
$1800\ N$
$1800\ N$
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MCQ 481 Mark
Why does a ship made of steel float on water while an oil-pin of steel sinks down?
  • A
    Density of sea water is greater and hence the ship floats
  • ✓
    Owing to the large volume of ship, it displaces more water, so up-thrust is more
  • C
    The ship contains large air pockets which help it to float smoothly
  • D
    In case of pin, the pressure is more since the area of its tip is small, so it sinks, but for ship the area of its base is more
Answer
Correct option: B.
Owing to the large volume of ship, it displaces more water, so up-thrust is more
(b) Owing to the large volume of ship, it displaces more water, so up-thrust is more
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MCQ 491 Mark
Suman has two equal masses. He drops them from the same height. He can make one to reach the ground earlier than the other by altering the:
  • A
    Density.
  • B
    Surface area.
  • C
    Volume.
  • ✓
    Cannot be altered.
Answer
Correct option: D.
Cannot be altered.
(d) Cannot be altered.
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MCQ 501 Mark
The value of g on the surface of moon is:
  • A
    zero
  • B
    The same as on the surface of the earth
  • C
    More than that on the surface of the earth
  • ✓
    Less than that on the surface of the earth
Answer
Correct option: D.
Less than that on the surface of the earth
(d) Less than that on the surface of the earth
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M.C.Q. [1 M] - Science STD 9 Questions - Vidyadip