gravitation class 9 mcq :This is the 20+ mcqs to grow your knowledge. Learn More gravitation class 9 mcq with this in-depth post
Questions For gravitation class 9 mcq
...... is needed to change the speed or the direction of motion of an object.
(A) velocity
(B) mass
(C) pressure
(D) force
The force that causes this acceleration and keeps the body moving along the circular path is acting towards the centre. This force is called the
(A) gravitational force
(B) centripetal force
(C) electrostatic force
(D) None Of These
The motion of the moon around the earth is due to the centripetal force.
(A) True
(B) False
(C) can't say
(D) Not Possible
If there were no centripetal force, the moon would pursue a uniform straight line motion.
(A) circular
(B) elliptical
(C) straight
(D) None Of These
According to the second law of motion, for a given force, acceleration is inversely proportional to the......
(A) pressure
(B) volume
(C) density
(D) Mass
This force of attraction between objects is called the force.
(A) magnetic
(B) gravitational
(C) electrostatic
(D) None Of These
Identify the incorrect statement.
(A) All the planets go around the Sun.
(B) The moon goes around the earth.
(C) In all these cases, there must be some force acting.
(D) None Of These
Every object in the universe attracts every other object with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them.
(A) True
(B) False
(C) can't say
(D) Not Possible
The............force is along the line joining the centres of two objects.
(A) magnetic
(B) gravitational
(C) electrostatic
(D) None Of These
The orbit of a planet is............with the Sun at one of the foci.
(A) circular
(B) elliptical
(C) rectilinear
(D) None Of These
The line joining the planet and the Sun sweep.......... areas in equal intervals of time.
(A) unequal
(B) equal
(C) maximum
(D) None Of These
The cube of the mean distance of a planet from the Sun is proportional to the .......of its orbital period T.
(A) Cube
(B) square
(C) fourth power
(D) None Of These
The value of G was found out by.......
(A) Isaac Newton
(B) Blaise Pascal
(C) Henry Cavendish
(D) None of These
The accepted value of G is 6.673 x. .Nm²/kg².
(A) 10-10
(B) 10-¹
(C) 10-¹2
(D) 10-9
The law is universal in the sense that it is applicable to all bodies, whether the bodies are big or small, whether they are celestial or terrestrial.
(A) True
(B) False
(C) can't say
(D) Not Possible
If d gets bigger by a factor of 6,F becomes ....... times smaller.
(A) 1/9
(B) 1/25
(C) 1/36
(D) 1/34
Universal law of gravitation successfully explained several phenomena such as:
(A) the motion of the moon around the earth.
(B) the motion of planets around the Sun
(C) the tides due to the moon and the Sun.
(D) all of the above
Whenever objects fall towards the earth under gravitational force alone, we say that the objects are in free fall.
(A) True
(B) False
(C) can't say
(D) Not Possible
The SI unit of g is......
(A) m/s
(B) m/s²
(C) m/s³
(D) m/h
Acceleration due to the gravitational force of the earth is denoted by
(A) f
(B) g
(C) a
(D) s
Identify the incorrect statement.
(A) The earth is not a perfect sphere.
(B) The radius of the earth increases from the poles to the equator
(C) The value of g becomes lesser at the poles than at the equator.
(D) None of These
Value of acceleration due to gravity on surface of the earth is.....m/s²
(A) 9.8
(B) 0
(C) 20
(D) 10
We see that paper reaches the ground little later than the stone. This happens because of air resistance.
(A) True
(B) False
(C) can't say
(D) Not Possible
......... of an object is the measure of its inertia.
(A) volume
(B) density
(C) mass
(D) None of These
Earth attracts every object with a certain force and this force depends on the ........
(A) mass of the object
(B) acceleration due to the gravity
(C) both a & b
(D) None Of These
SI unit of weight is the same as that off......
(A) maes
(B) force
(C) density
(D) All of These
The weight is a force acting vertically downwards;
(A) downwards
(B) upwards
(C) backward
(D) Forward
Mass of an object is 10 kg. What is its weight on the earth?
(A) 98 N
(B) 196 N
(C) 10 N
(D) 100 N
Two objects of different masses falling freely near the surface of moon would
(A) have same velocities at any instant
(B) have different accelerations
(C) experience forces of same magnitude
(D) undergo a change in their inertia
The value of acceleration due to gravity
(A) is same on equator and pole?
(B) is least on poles
(C) is least on equator
(D) increases from pole to equator
The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them, then the gravitational force would become......
(A) F/4
(B) F/2
(C) F
(D) 2 F
A boy is whirling a stone tied with a string in an horizontal circular path. If the string breaks, the stone.......
(A) will continue to move in the circular path
(B) will move along a straight line towards the centre of the circular path
(C) will move along a straight line tangential to the circular path
(D) will move along a straight line perpendicular to the circular path away from the boy
In the relation F GM m/d², 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
(D) is universal constant of nature
Law of gravitation gives the gravitational force between
(A) the earth and a point mass only
(B) the earth and sun only
(C) any two bodies having some mass
(D) two charged bodies only
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
(D) is independent of mass and radius of the earth
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) 1/4 times
(B) 4 times
(C) 1/2 times
(D) unchanged
The atmosphere is held to the earth by
(A) gravity
(B) wind
(C) clouds
(D) earth's magnetic field
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
(D) universal gravitational constant
The weight of an object at the centre of the earth of radius R is
(A) zero
(B) infinite
(C) R times the weight at the surface of the earth
(D) 1/R² times the weight at surface of the earth
An apple falls from a tree because of gravitational attraction between the earth and apple. If F₁ is the magnitude of force exerted by the earth on the apple and F2 is the magnitude of force exerted by apple on earth, then
(A) F₁ is very much greater than F2
(B) (b)F2 is very much greater than F₁
(C) (c)F₁ is only a little greater than F2
(D) (d)F₁ and F2 are equal
The value of G on the moon will be:
(A) Same as that on the earth
(B) About one-fifth of that on the earth
(C) About one-sixth of that on the earth
(D) All of These
A stone is released from the top of a tower of height 19.6 m. Then its final velocity just before touching the ground will be:
(A) 384.16 m/s
(B) 196 m/s
(C) 19.6 m/s
(D) 3841.4 m/s
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) 1/4 times
(B) 4 times
(C) 1/2 times
(D) Unchanged
Two objects of different masses falling freely near the surface of moon would:
(A) Have different accelerations
(B) Undergo a change in their inertia
(C) Have same velocities at any instant
(D) Experience forces of same magnitude
The atmosphere is held to the Earth by
(A) gravity
(B) wind
(C) clouds
(D) Earth's magnetic field
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
(D) universal gravitational constant
The acceleration due to gravity on the Earth depends upon the
(A) mass of the body
(B) mass of the Earth
(C) shape and size of the body
(D) volume of the body
When a mango falls from a mango tree then
(A) only the Earth attracts the mango.
(B) only the mango attracts the Earth.
(C) both the mango and the Earth attract each other.
(D) both the mango and the Earth repel each other.
If the gravitational attraction of the Earth suddenly disappears, which of the following statements will be true?
(A) The weight of body will become zero but the mass will remain same.
(B) The weight of a body will remain same but the mass will become zero.
(C) Both mass and weight become zero.
(D) Neither mass nor weight becomes zero.
In the polar regions, the value of acceleration due to gravity
(A) is same as at the equator
(B) Is more than at the equator
(C) is less than at the equator
(D) zero
Weight of an object on the surface of the moon is......
(A) 1/2 th of the weight of object on the surface of the earth
(B) 1/4 th of the weight of object on the surface of the earth
(C) 1/6 th of the weight of object on the surface of the earth
(D) 1/8 th of the weight of object on the surface of the earth
If the distance between objects decreases, then the gravitational force between the objects will:
(A) decrease
(B) Increase
(C) remain same
(D) none of the above
Final Words :
I hope this will help you to grow your knowledge in this gravitation class 9 mcq.
Read Also :22 Mind-Blowing class 9 science chapter 5 mcq online test
0 Comments