Gravitation Test

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Gravitation Test - 14

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Question 1
1 / -0

Use the following information to answer the next question.

Robert goes on a space mission to moon. His weight on Earth is 78 N, while his weight on moon is just 13N.

Robert’s weight decreases on moon because

A
Earth’s gravitational pull is greater than that of moon

B
Earth’s radius is greater than that of moon

C
Robert’s density changes on moon

D
Robert’s mass changes on moon

Solution

Weight is the measure of the gravitational pull acting on an object. The gravitational pull of Earth is greater than that of moon. Gravity on moon is one-sixth of the gravity on Earth. Hence, Robert’s weight on moon is

one-sixth his weight on Earth.

The correct answer is A.

Why alternative B is wrong:

Radii of Earth and moon have no relation to Robert’s weight on Earth and moon.

Why alternative C is wrong:

Robert’s density is a constant. It is the same on Earth and moon.

Why alternative D is wrong:

Mass is the measure of the amount of material in an object. It is a conserved quantity. Robert cannot lose mass as he leaves Earth’s atmosphere for moon.

Question 2

1 / -0

Use the following information to answer the next question.

The specific gravities of a few liquids are shown in the given table.	Liquid	Specific Gravity
	Ethyl alcohol	0.772 − 0.789
	Ammonia	0.662
	Benzene	0.899 − 0.885
	Water	1.02

If a hydrometer is used to check the specific gravities of the given liquids, then it would sink the most in

ammonia

benzene

ethanol

water

Solution

If the specific gravity of a compound is less, then the hydrometer sinks deeper so as to displace its weight with the liquid. Hence, a hydrometer will sink the most in ammonia.

The correct answer is A.

Why alternatives B, C and D are wrong:

The specific gravities ofbenzene, ethanol, and water are more than that of ammonia. Thus, these liquids are heavier than ammonia. As a result, the hydrometer needs to displace fewer amounts of benzene, ethanol, and water as compared to ammonia. Hence, alternatives B, C, and D are incorrect.

Question 3

1 / -0

Use the following information to answer the next question.

Four containers each of volume 2 L are filled with four different materials. The mass of the containers is then determined using a beam balance. Their respective masses are listed in the given table.
Container	Mass (in kg)
Containing iron	14.000
Containing honey	2.800
Containing water	2.000
Containing oxygen	0.003

Which material has the minimum density?

Iron

Water

Honey

Oxygen

Solution

Density is defined as the mass per unit volume of a material. Since all the containers have equal volume, the container having the minimum mass contains the material with the minimum density. The mass of the container containing oxygen is the minimum. Hence, the density of oxygen is the minimum.

The correct answer is D.

Question 4

1 / -0

Use the following information to answer the next question.

The density of water from different sources is shown in the given table. The average density of the human body is 1,010 kg/m³.
Source	Rain	Ocean	Well	Dead Sea
Density (kg/m³)	1,000	1,027	1,008	1,315

Human body can float in

ocean water and water from well

rain water and water from well

ocean water and the Dead Sea

rain water and the Dead Sea

Solution

Human body is able to float in fluids with densities that are more than the density of the average human body. Hence, human body can float in ocean water and the Dead Sea.

The correct answer is C.

Why alternatives A, B and D are wrong:

The densities of rain water and water from well are less than that of the average human body. Therefore, human body will sink in rain water and water from well. Hence, alternatives A, B, and D are incorrect.

Question 5
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Which of the following statements is false regarding buoyant and gravitational forces?

A
Buoyant force acts perpendicularly to the force of gravitation.

B
Buoyant and gravitational forces are independent of each other.

C
Buoyant and gravitational forces act parallel and in the same direction.

D
Buoyant and gravitational forces act parallel but in opposite directions.

Solution

Buoyant force and gravitational force act in opposite directions and both forces depend on gravitational acceleration, i.e., without gravity there is no buoyancy. Hence the statement contained in alternative D is false regarding buoyant and gravitational forces.

The correct answer is D.
Question 6
1 / -0

Use the following information to answer the next question.

Andrew has three coins, a nickel and two dime. Andrew knows that the mass of the two dimes is equal to that of the nickel.

Andrew can verify the masses of the coins by using a

A
ruler

B
spirit level

C
thermometer

D
beam balance

Solution

Mass is the amount of matter present in a substance. A beam balance can be used to compare the masses of two objects. Hence, Andrew can use a beam balance to verify the masses of the coins.

The correct answer is D.

Why alternative A is wrong:

A ruler is used to measure length.

Why alternative B is wrong:

A spirit level is used to check the slope of a surface.

Why alternative C is wrong:

A thermometer is used to measure temperature.
Question 7
1 / -0

An iron ball thrown up in air comes back to ground because of the

A
thedifference in temperature at different heights

B
the difference in air pressure at different heights

C
Earth’sgravitation pull

D
Earth’smagnetic field

Solution

An iron ball has mass. As a result, it experiences a gravitational pull from Earth. This force makes it come back to ground when thrown up in air.

The correct answer is C.

Why alternative A is wrong:

The difference in temperature is not responsible for the iron ball to come back to ground.

Why alternative B is wrong:

The difference in air pressure can keep the iron ball suspended in air if its mass is not very large. However, it cannot make the ball come back to ground.

Why alternative D is wrong:

The force exerted by Earth’s magnetic field on the iron ball is very low. It cannot make the ball come back to ground.

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Gravitation Test - 14

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Gravitation Test - 14

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SHARING IS CARING

Question 1

Earth’s gravitational pull is greater than that of moon

Earth’s radius is greater than that of moon

Robert’s density changes on moon

Robert’s mass changes on moon

Solution

Question 2

ammonia

benzene

ethanol

water

Solution

Question 3

Iron

Water

Honey

Oxygen

Solution

Question 4

ocean water and water from well

rain water and water from well

ocean water and the Dead Sea

rain water and the Dead Sea

Solution

Question 5

Buoyant force acts perpendicularly to the force of gravitation.

Buoyant and gravitational forces are independent of each other.

Buoyant and gravitational forces act parallel and in the same direction.

Buoyant and gravitational forces act parallel but in opposite directions.

Solution

Question 6

ruler

spirit level

thermometer

beam balance

Solution

Question 7

thedifference in temperature at different heights

the difference in air pressure at different heights

Earth’sgravitation pull

Earth’smagnetic field

Solution

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