Gravitation Test

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Gravitation Test - 10

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Question 1
1 / -0

Find the incorrect statement.

A
When a body is thrown up, the acceleration due to gravity is directed upwards.

B
That planet will have large value of ‘g’ which has large value of mass and small value of radius.

C
Air resistance may make the acceleration different.

D
Mass is a vector quantity.

Solution

Value of g depends upon mass of the planet and radius, acceleration due to gravity does not change due to air friction. Body moving in upward direction will have gravitational force in downward direction.
Question 2
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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

A
1-A, 2-C, 3-B, 4-D

B
1-B, 2-D, 3-A, 4-C

C
1-C, 2-B, 3-D, 4-A

D
1-D, 2-A, 3-C, 4-B

Solution

(1) Fluid: Gasses and liquids are all fluids, because the molecules that make them up are in constant motion.
(2) Mass: The mass of a body is the quantity of matter it contains.
(3) Weight : The weight of an object is the force with which it is attracted towards the earth.
(4) Newton’s law of gravitation: Law of Gravitation states that force of attraction by which an object attracts other object is directly proportional to the product of their masses and inversely proportional to the square of distance between them.
Question 3
1 / -0

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

A
1-C, 2-B, 3-D, 4-A

B
1-B, 2-D, 3-A, 4-C

C
1-D, 2-A, 3-C, 4-B

D
1-A, 2-C, 3-B, 4-D

Solution

(1) Acceleration due to gravity depends on latitude of the place.
(2) The accepted value of G is 6.673×10⁻¹¹Nm² kg⁻²
(3) When an object falls from any height under the influence of gravitational force only, it is known as free fall.
(4) One kg wt = 9.8N
Question 4
1 / -0

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

A
1-D, 2-A, 3-C, 4-B

B
1-C, 2-B, 3-D, 4-A

C
1-A, 2-C, 3-B, 4-D

D
1-B, 2-D, 3-A, 4-C

Solution

(1) Archimedes' principle is also used in designing ships and submarines. The floating of a big ship is based on the Archimedes' principle.
(2) Weight of object on moon is one sixth of weight of an object on earth.
(3) Strap of school bag made wider to Reduce pressure on shoulder.
(4) Buoyancy is the upward force exerted by fluids over the surface are of contact of an object which is immersed in fluids.
Question 5
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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

A
1-D, 2-A, 3-C, 4-B

B
1-C, 2-B, 3-D, 4-A

C
1-B, 2-D, 3-A, 4-C

D
1-A, 2-C, 3-B, 4-D

Solution

(1) Universal law of gravitation applied for motion of moon around the earth.
(2) The gravitational force between a mass and the Earth is the object's weight.
(3) The force acting (thrust) per unit area is called pressure.
(4) The mass per unit volume of a substance is called density.
Question 6
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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) Pascal

A
1-A, 2-C, 3-B, 4-D

B
1-B, 2-D, 3-A, 4-C

C
1-D, 2-A, 3-C, 4-B

D
1-C, 2-B, 3-D, 4-A

Solution

(1) Value of G is always constant.
(2) Object floats over water if its density is less than water.
(3) S.I unit of pressure is Pascal.
(4) S.I unit of weight is Newton.
Question 7
1 / -0

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

A
1-D, 2-A, 3-C, 4-B

B
1-C, 2-B, 3-D, 4-A

C
1-B, 2-D, 3-A, 4-C

D
1-A, 2-C, 3-B, 4-D

Solution

(1) The force applied on a surface in a direction perpendicular or normal to the surface is called thrust.
(2) g = 9.8 m /s²
(3) gm=1.63m/s²
(4) The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
Question 8
1 / -0

Match the following with correct response.

(1) Density
(2) Relative density
(3) Acceleration due to gravity
(4) Gravitational contrast

(A) No unit
(B) Nm^2/Kg²
(C) m/s²
(D) Kg/m³

A
1-D, 2-A, 3-C, 4-B

B
1-B, 2-D, 3-A, 4-C

C
1-A, 2-C, 3-B, 4-D

D
1-C, 2-B, 3-D, 4-A

Solution

(1) The SI unit of Density is kilogram per cubic metre (kg/m³) and the cgs unit of gram per cubic centimetre (g/cm³)
(2) Relative density of a substance = Density of the substance/Density of water at 4°C As relative density is the ratio of densities, it has no units.
(3) The acceleration which is gained by an object because of the gravitational force is called its acceleration due to gravity. Its SI unit is m/s² .
(4) The SI unit of G is Nm²kg⁻².
Question 9
1 / -0

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

A
1-C, 2-B, 3-D, 4-A

B
1-D, 2-A, 3-C, 4-B

C
1-B, 2-D, 3-A, 4-C

D
1-A, 2-C, 3-B, 4-D

Solution

(1) Mass is measured by a beam balance.
(2) Weight is measured by a spring balance.
(3) A lactometer is an instrument that is used to check for the purity of milk by measuring its density.
(4) A hydrometer or areometer is an instrument that measures the specific gravity (relative density) of liquids.

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Gravitation Test - 10

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Gravitation Test - 10

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Question 1

When a body is thrown up, the acceleration due to gravity is directed upwards.

That planet will have large value of ‘g’ which has large value of mass and small value of radius.

Air resistance may make the acceleration different.

Mass is a vector quantity.

Solution

Question 2

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

Solution

Question 3

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

Solution

Question 4

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

Solution

Question 5

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

Solution

Question 6

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

Solution

Question 7

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

Solution

Question 8

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

Solution

Question 9

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

Solution

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