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Gravitation Science - Gravitation

Gujarat Board (GSEB) - STD 9 - Science (GSEB - English Medium). 486 questions in this chapter.

Question types

Gravitation question types

486 questions across 8 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

486
Questions
8
Question groups
5
Question types
Sample Questions

Gravitation questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q. [1 M]1 Mark
An object having mass equal to 350g occupies 200cm3 of the space. When this object is thrown into a river what will be the condition of this object there? (Density of water = 1g/ cm3)
  • A
    It will float on the surface of water.
  • B
    It will float fully submerged in the liquid.
  • ✓
    It will sink in the liquid.
  • D
    It will float partially submerged in the liquid.

Answer: C.

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Q 2M.C.Q. [1 M]1 Mark
Three spheres have radii 1cm, 2cm and 3cm, respectively. Which sphere exerts maximum pressure on earth?
  • ✓
    First
  • B
    Second
  • C
    Third
  • D
    All equal

Answer: A.

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Q 4M.C.Q. [1 M]1 Mark
The upward force exerted by a liquid on an object is called _______?
  • A
    Upward force
  • B
    Top force
  • ✓
    Buoyant force
  • D
    Fluid force

Answer: C.

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Q 5M.C.Q. [1 M]1 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: A.

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Q 21Que-Ans (Each of 2 Mark )2 Marks
You have a bag of cotton and an iron bar, each indicating a mass of 100kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?
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Q 29Que-Ans (Each of 3 Mark )3 Marks
A stone is allowed to fall from the top of a tower 100m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25m/ s. Calculate when and where the two stones will meet.
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Q 30Que-Ans (Each of 3 Mark )3 Marks
Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth = 6 × 1024kg and of the Sun = 2 × 1030kg. The average distance between the two is 1.5 × 1011m.
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Q 32Que-Ans (Each of 4 Mark )4 Marks

Two objects of masses m1 and m having the same size are dropped simultaneously from heights h1 and h2 respectively. Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if

  1. One of the objects is hollow and the other one is solid.
  2. Both of them are hollow, size remaining the same in each case. Give reason.
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Q 33Que-Ans (Each of 4 Mark )4 Marks

If the distance between two masses is increased by a factor of 5, by what factor would the mass of one of them have to be altered to maintain the same gravitational force? Would this be an increase or decrease in the mass?

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Q 35Que-Ans (Each of 4 Mark )4 Marks
The mass of a planet is 6 x 1024kg and its diameter is 12.8 x 103km. If the value of gravitational constant be 6.7 x 10-11Nm2/kg2, calculate the value of acceleration due to gravity on the surface of the planet. What planet could this be?
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Q 36Case study ( 4 Marks )4 Marks
Every object in the universe attracts every other object with a force which is proportional to the product of their masses (m1*m2) and inversely proportional to the square of the distance (d2) between them. The force is along the line joining the centers of two objects.

(i)Gravitational force does not depend on

(a) Masses of objects

(b) Separation between objects

(c) Charges on objects

(d) None of these

(ii) Force of gravitation varies with masses of object as

(a) Product of masses

(b) Sum of masses

(c) Difference of masses

(d) None of these

(iii) When mass of one body is doubled then force of gravitation will become

(a) Force will remain same

(b) Force will become double

(c) Force will become halved

(d) None of these

(iv)What is universal gravitational constant? What is its SI unit?

(v) Two objects of masses 10kg and 20kg separated by distance 10m. What is gravitational force between them?

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Q 37Case study ( 4 Marks )4 Marks
The force acting on an object perpendicular to the surface is called thrust. When you stand on loose sand, the force, that is, the weight of your body is acting on an area equal to area of your feet. When you lie down then the same force acts on an area equalto the contact area of your whole body, which is larger than the area of your feet. Thus, the effects of forces of the same magnitude on different areas are different. In the above cases, thrust is the same. But effects are different. Therefore the effect of thrust depends on the area on which it acts. The effect of thrust on sand is larger while standing than while lying. The thrust on unit area is called pressure.

Pressure=thrust/area. SI unit of pressure as N/m2or Pascal.

(i) SI unit of thrust is

(a) m/s

(b) m/s2

(c) Newton(N)

(d) None of these

(ii) We have two different areas A and B. where A>B. Then relation between pressure on A(PA) and pressure on B (PB) is

(a) PA>PB

(b) PB>PA

(c) PA=PA

(d) None of these

(iii)SI unit of pressure is

(a) N/m2

(b) Pascal.

(c) Both a and b

(d) None of these

(iv) The effects of forces of the same magnitude on different areas are different. True or false

(a) True

(b) False

(c) None of these

(v) Define pressure.

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Q 38Case study ( 4 Marks )4 Marks
 As you know, the density of a substance is defined as mass of a unit volume. The unit ofdensity is kilogram per meter cube (kg/m-3). The density of a given substance, under specified conditions, remains the same. Therefore the density of a substance is one of its characteristic properties. It is different for different substances. For example, the density of gold is 19300 (kg/m-3) while that of water is 1000 (kg/m-3). The density of a given sample of a substance can help us to determine its purity. It is often convenient to express density of a substance in comparison with that of water. The relative density of a substance is the ratio of its density to that of water:

Density of a substance

Relative density =

Density of water

Since the relative density is a ratio of similar quantities, it has no unit. Answer the following.

(i) SI unit of density is

(a) kg/m

(b) kg /m2

(c) kg /m3

(d) None of these

(ii) SI unit of relative density is

(a) kg/s

(b) No unit

(c) kg /s3

(d) None of these

(iii) Relative density of water is

(a) 1000

(b) 1

(c) 10

(d) None of these

(iv)Define relative density.

(v) Comment of relative density value of substance which

(1) Sink in water

(2) float on water

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Q 39Case study ( 4 Marks )4 Marks
Archimedes’ principle, stated as follows: When a body is immersed fully or partiallyin a fluid, it experiences an upward force thatis equal to the weight of the fluid displacedby it. The upward force is known as up thrust or buoyant force. In fact, all objects experience a force of buoyancy when they are immersed in a fluid. The magnitude of this buoyant force depends on the density of the fluid.Objects having density less than that of the liquid in which they are immersed float on the surface of the liquid. If the density of the object is more than the density of the liquid in which it is immersed then it sinks in the liquid. Hence body will float or sink depends upon difference between density of body and fluid.

(i)The up thrust of the body is equal to the

(a) Mass of liquid

(b) Weight of liquid

(c) Weight of liquid displaced by body

(d) None of these

(ii) If the density of the object is more than the density of the liquid in which it is immersed then

(a) It sinks in liquid

(b) It floats on liquid

(c) It comes out of liquid

(d) None of these

(iii) When anybody immersed in liquid it experience a force called as

(a) Gravitational force

(b) Buoyancy force

(c) Nuclear force

(d) None of these

(iv) State Archimedes’ principle.

(v) Why does cube of plastic released deep down under the water come up to surface of water?

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Q 40Case study ( 4 Marks )4 Marks
We know that the earth attracts every object with a certain force and this force depends on the mass (m) of the object and the acceleration due to the gravity (g). The weight of an object is the force with which it is attracted towards the earth. Mathematically

W = m x g

Where, W= weight of object

m= mass of object

g= acceleration due to the gravitational force

As the weight of an object is the force with which it is attracted towards the earth, the SI unit of weight is the same as that of force, that is, Newton (N). The weight is a force acting vertically downwards; it has both magnitude and direction. We have learnt that the value of g is constant at a given place. Therefore at a given place, the weight of an object is directly proportional to the mass, say m, of the object, that is, W αm. It is due to this reason that at a given place, we can use the weight of an object as a measure of its mass. Answer the following questions.

(i) Unit of acceleration due to the gravity (g) is

(a) m/s

(b) m/s2

(c) Newton(N)

(d) None of these

(ii) Direction of weight of any object is 

(a) Always towards centre of earth

(b) Always away from centre of earth

(c) Weight don’t have direction

(d) None of these

(iii) Which of the following has same unit

(a) Mass and weight

(b) Weight and force

(c) Velocity and acceleration

(d) None of these

(iv) Whether weight is scalar quantity or vector quantity? Justify your answer.

(v) Differentiate between mass and weight.

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