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Gravitation (Test -2) - Class 9 Science, 21-02-2018


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30 Questions MCQ Test | Gravitation (Test -2) - Class 9 Science, 21-02-2018

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Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 1

1 kg wt = ?

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 2

Match the following with correct response. 
(1) Fluid 
(2) Mass 
(3) Weight 
(4) Newton’s law of gravitation 

(A) Gravitation force, earth attracts an object 
(B) Gases 
(C) Inversely proportional to square of distance 
(D) Quantity of matter

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 3

What is the force of gravitation between two point masses of 1kg and 2kg kept 1 m apart?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 3

 

Gravitational force = G.m1xm2/d2

 

=6.67×10−11×1×2/12

=13.34×10−11N.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 4

The value of ‘g’ at the mount Everest is

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 4

the value of 'g' at the mount everest is < g (acceleration due to gravity on earth surface) because with increase in height, gravitational of earth diseases.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 5

Statement A: When an object is thrown up then its speed at any position while going up is same as the speed while coming down. 
Statement B: A can’t have zero weight
Which of the two statements is true?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 5

When an object is thrown up its speed decreases with height. After attaining maximum height object start falling down ward with increasing speed.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 6

Match the following with correct response. 
(1) Acceleration due to gravity depends
(2) Gravitational constant 
(3) Free fall of the object 
(4) One kg wt.

(A) 9.8N 
(B) 6.6734×10−11Nm2/Kg2
(C) Latitude of the place 
(D) Influence of earth’s gravitational pull

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 7

Newton’s law of gravitation is valid in

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 7

Newton’s law of gravitation or universal law of gravitation is valid everywhere, in laboratory, on earth surface, or on other solar system.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 8

A ball thrown up vertically returns to the ground after 10 second. Find the velocity with which it was thrown up? (g=10m/s2)

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 8

Time taken to reach at highest point = 10/2 = 5s. Value of g 
=10m/s2. Final velocity (v) = 0 at height point. V= u + gt, 0=u+(−10)×5, 0 = u -50, u= 50m.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 9

Calculate the mass of the Earth. given radius of the Earth is6.4×106m6.4×106m.

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 9

g =GM/r2,

M= g×r2/G=9.8×(6.4×106)2 ÷6.67×10−11

=6×1027m=6 ×1024Km.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 10

Match the following with correct response. 
(1) Archimedes principle 
(2) Weight of object on moon 
(3) Strap of school bag made wider 
(4) Buoyant force 

(A) One sixth of weight of an object on earth 
(B) Upward force 
(C) To Reduce pressure on shoulder 
(D) Used in designing ships & submarines

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 11

How does the force of gravitation between two objects change when the distance between them is reduced to half?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 11

Gravitational force is indirectly proportional to square of the distance between them. Hence when distance is reduced to half the gravitational force will increase four times.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 12

As we move above the surface of the Earth, the value of g

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 12

As we move above the surface of the earth, the value of g, acceleration due to gravity decreases asg=GM/r2. With increase in height, r also increases.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 13

If the weight of Harsh is 150N. What is his mass? (g =10m/s2)

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 13

Weight of a body (W) = Mass x acceleration due to gravity. Here, W= 150 N and g=10m/s2.  So, Mass = W/g = 150 N / 1010m/sb= 15 Kg.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 14

Match the following with correct response. 
(1) Universal law of gravitation 
(2) Gravitation force between the earth and an object 
(3) Thrust per unit area 
(4) Mass per unit volume 

(A) Motion of moon around the earth 
(B) Pressure 
(C) Weight 
(D) density

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 15

Which of the following statement are incorrect-
A Value of acceleration due to gravity is same at all places
B Mass is constant at all places
C Weight is constant at all places 
D Weight of an object can be zero. 

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 16

Drop an iron nail and a sheet of paper from the roof of your house. Which of the two will reach the ground first?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 16

Although the force by which iron nail and a sheet of paper is attracted towards the earth is equal. The more air friction is faced by sheet of paper due to larger size. So, iron nail will reach the ground first.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 17

Statement A: A person will weigh more in Ooty than in Delhi, 
Statement B: mass is measured by pan balance and weight is measured by spring balance. 
Which of the two statements is true?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 17

Value of g decreases as we move at higher altitude, so ‘g’ is less at Ooty than Delhi. Weight will be less in Ooty than Delhi. Mass is measured by pan of beam balance and weight is measured by spring balance.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 18

Match the following with correct response. 
(1) Value of G 
(2) Object floats over water 
(3) S.I unit of pressure 
(4) S.I unit of weight 

(A) Newton 
(B) Density is less than water 
(C) Always constant 
(D) Pasca

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 19

What happens to the force between two objects if the masses of both objects are doubled?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 19

As the gravitational force between two bodies is directly proportional to the product of their masses. If mass of the both of objects are doubled. The value of force becomes four times.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 20

Find the in correct statement ?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 20

Value of g depends upon mass of earth and the distance between the centre of the object and earth. The value of g increase with depth as distance decreases between two centres.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 21

Statement A: Mass of a body is a fundamental property
Statement B: Weight is a fundamental property. 
Which of the two statements is true?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 21

Mass of a body always remains same. Mass is independent of other factors. Hence mass is a fundamental property. On the other hand weight of the body is the force by which it is attracted by earth that depends upon value of ‘g’. Weight is not a fundamental factor.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 22

 

Match the following with correct response. 
(1) Thrust 
(2) Ge 
(3) gm 
(4) Motion of planets in fixed orbit 

(A) 1.63 m/s2
(B) Force perpendicular to the surface 
(C) Gravitational attraction of sun 
(D) 9.8 m/s2

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 23

The distance between two particles is decreased. The gravitational force between them

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 23

Gravitational force between two bodies is inversely proportional to square of the distance between them. So, when distance between two bodies is decreased the gravitational force between them will increase.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 24

Which of the following statement is incorrect?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 24

When a body is dropped freely from a height its initial velocity is zero and thrown vertically upward its final velocity becomes zero and acceleration due to gravity is negative in case of body thrown vertically upward.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 25

A body has a weight W on the surface of Earth. What is its weight on a planet which has mass 10 times that of the Earth and a radius of 4 times that of the earth?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 25

W of earth = W, mass on earth = W/g. 

 

mass of planet =10×m10×m, g of planet =10m/42

Weight on the planet =16×W/10= 8/5W.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 26

 

Match the following with correct response. 
(1) Density 
(2) Relative density 
(3) Acceleration due to gravity 
(4) Gravitational contrast 

(A) No unit 
(B) Nm2/Kg2
(C) m/s2
(D) Kg/m3

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 27

If Ge is the value of universal gravitational constant at the Earth and Gm is the value of universal gravitational constant on the moon then

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 27

As Universal gravitational constant remain same throughout the universe. The value of Gm and Ge will be same. So, Ge= Gm.

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 28

“When an apple is thrown up earth attract the apple but the apple does not attract the earth” The above written statement is

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 29

If a block of mass weighed 1N at equator, What would be its weight at poles?

Detailed Solution for Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 29

Value of ‘g’ is slightly less at poles in comparison to that of equator due to closeness to centre of earth. Weight of the body is equal to product of mass and acceleration due to gravity. Hence, weight will be more on poles than equator

Gravitation (Test -2) - Class 9 Science, 21-02-2018 - Question 30

Match the following with correct response. 
(1) Mass is measured by 
(2) Weight is measured by 
(3) Purity of milk 
(4) Density of liquid 

(A) Beam balance 
(B) Lactometer 
(C) Spring balance 
(D) Hydrometer

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