The SI unit of thrust is:
Question types
Gravitation question types
492 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
492
Questions
9
Question groups
5
Question types
01
M.C.Q. [1 M]
173 Q→02Assertion (A) & Reason (B) MCQ
5 Q→03true or false
11 Q→04Fill in the blank
17 Q→05Very short answer type question [1 M ]
77 Q→06Que-Ans (Each of 2 Mark )
140 Q→07Que-Ans (Each of 3 Mark )
49 Q→08Que-Ans (Each of 4 Mark )
15 Q→09Case study ( 4 Marks )
5 Q→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.
View full solution →
An object is thrown vertically upwards with a velocity u, the greatest height h to which it will rise before falling back is given by:
Apparent loss of weight of a body when immersed in a liquid can be explained on the basis of:
Weight is:
A body is brought from the earth to the moon is ___?
A statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
Reason: A planet revolving around the sun follows Kepler's law.
- If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
- If Assertion is true, but Reason is false.
- If Assertion is false, but Reason is true.
- If Assertion and Reason both are false.
Reason: A planet revolving around the sun follows Kepler's law.
A statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
Reason: On going below the earth surface, the value of gravitational acceleration increases.
- If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
- If Assertion is true, but Reason is false.
- If Assertion is false, but Reason is true.
- If Assertion and Reason both are false.
Reason: On going below the earth surface, the value of gravitational acceleration increases.
In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Reason: Mass of a body can be zero.
- Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
- The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
- Assertion is true but the Reason is false.
- The statement of the Assertion is false but the Reason is true.
Reason: Mass of a body can be zero.
A statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
Reason: During floating the body will experience no net downward force in that case.
- If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
- If Assertion is true, but Reason is false.
- If Assertion is false, but Reason is true.
- If Assertion and Reason both are false.
Reason: During floating the body will experience no net downward force in that case.
In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Reason: The upthrust exerted by a fluid; independent of the volume of the immersed body.
- Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
- The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
- Assertion is true but the Reason is false.
- The statement of the Assertion is false but the Reason is true.
Reason: The upthrust exerted by a fluid; independent of the volume of the immersed body.
The following statements are true or false:
A falling stone also attracts the earth.
A falling stone also attracts the earth.
Weight is a vector quantity and mass is a scalar quantity. [True/ False]
The following statements are true or false:
Tire weight of an object on the earth is about one-sixth of its weight on the moon.
Tire weight of an object on the earth is about one-sixth of its weight on the moon.
Ships and submarines are designed on the basis of Archimedes Principle. [True/ False]
State whether the following statements are true or false:
'Archimedes’ principle can also be applied to gases.
'Archimedes’ principle can also be applied to gases.
Fill in the following blanks with suitable word:
The weight of an object on the moon is about ________ of its weight on the earth.
The weight of an object on the moon is about ________ of its weight on the earth.
Acceleration due to gravity is ________ at centre of earth.
Fill in the following blanks with suitable word:
If the area of a snow shoe is five times ______ than the area of an ordinary shoe, then the pressure of a snow shoe on the snow is five times _______.
If the area of a snow shoe is five times ______ than the area of an ordinary shoe, then the pressure of a snow shoe on the snow is five times _______.
Fill in the following blanks with suitable word:
In order to sink in a fluid, the density of an object must be _____ than the ______ of the fluid.
In order to sink in a fluid, the density of an object must be _____ than the ______ of the fluid.
Fill in the following blanks with suitable word:
In fluids (liquids and gases), pressure acts in ______ directions, and pressure ______ as the depth increases.
In fluids (liquids and gases), pressure acts in ______ directions, and pressure ______ as the depth increases.
On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?
Which of the Kepler’s laws of planetary motion led Newton to establish the inverse-square rule for gravitational force between two bodies?
What will be the weight of following objects on the earth when their weight on the moon is:
- 1800N
- 400N
An object has mass of $20\ kg$ on earth. What will be its $(i)$ mass, and $(ii)$ weight, on the moon? $(g$ on moon $= 1.6m/s^2).$
View full solution →Does the acceleration produced in a freely falling body depend on the mass of the body?
What is meant by the term ‘buoyancy’?
A pressure of $10\ Pa$ acts on an area of $3.0\ m^2$. What is the force acting on the area? What force will be exerted by the application of same pressure if the area is made one$-$third?
View full solution →A boy gets into a floating boat.
- What happens to the boat?
- What happens to the weight of water displaced?
- What happens to the buoyant force on the boat?
State two applications of universal law of gravitation.
What is the importance of universal law of gravitation?
Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h. Assuming all conditions are identical, will those packets take same time to reach the surface of earth. Justify your answer.
A ball thrown up vertically returns to the thrower after $6s$. Find the maximum height it reaches.
View full solution →A ball thrown up vertically returns to the thrower after $6s$. Find its position after $4s$.
View full solution →Calculate the density of an object of volume $3m^3$ and mass $9\ kg$. State wheater this object will float or sink in water. Give reason for your answer.
View full solution →The earth is acted upon by gravitation of Sun, even though it does not fall into the Sun. Why?
Write the differences between mass and weight of an object.
- How does a boat float in water?
- A piece of steel has a volume of $12\ cm^3,$ and a mass of $96g$. What is its density: $(i)$ in $g/cm^{3 }\ (ii)$ in $kg/m^3$?
Two objects of masses $m_1$ and $m$ having the same size are dropped simultaneously from heights $h_1$ and $h_2$ respectively. Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if
View full solution →- One of the objects is hollow and the other one is solid.
- Both of them are hollow, size remaining the same in each case. Give reason.
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?
View full solution →Suppose a planet exists whose mass and radius both are half those of the earth. Calculate the acceleration due to gravity on the surface of this planet.
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. $\text{SI}$ unit of pressure as $N/m^2$ or Pascal.
$(i)\ \text{SI}$ unit of thrust is
$(a)\ m/s$
$(b)\ m/s^2$
$(c)$ Newton$(N)$
$(d)$ None of these
$(ii)$ We have two different areas $A$ and $B$. where $A > B$. Then relation between pressure on $A(P_A)$ and pressure on $B (P_B)$ is
$(a) \ P_{A>}P_B$
$(b) \ P_{B>}P_A$
$(c) \ P_{A=}P_A$
$(d)$ None of these
$(iii)\ \text{SI}$ unit of pressure is
$(a) \ N/m^2$
$(b)$ 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.
View full solution →$(i)\ \text{SI}$ unit of thrust is
$(a)\ m/s$
$(b)\ m/s^2$
$(c)$ Newton$(N)$
$(d)$ None of these
$(ii)$ We have two different areas $A$ and $B$. where $A > B$. Then relation between pressure on $A(P_A)$ and pressure on $B (P_B)$ is
$(a) \ P_{A>}P_B$
$(b) \ P_{B>}P_A$
$(c) \ P_{A=}P_A$
$(d)$ None of these
$(iii)\ \text{SI}$ unit of pressure is
$(a) \ N/m^2$
$(b)$ 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.
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.
$(i) \ \text{SI}$ unit of density is
$(a)\ kg/m$
$(b) \ kg /m^2$
$(c) \ kg /m^3$
$(d)$ None of these
$(ii) \ \text{SI}$ unit of relative density is
$(a) \ kg/s$
$(b)$ No unit
$(c) \ kg /s^3$
$(d)$ 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
View full solution →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.
$(i) \ \text{SI}$ unit of density is
$(a)\ kg/m$
$(b) \ kg /m^2$
$(c) \ kg /m^3$
$(d)$ None of these
$(ii) \ \text{SI}$ unit of relative density is
$(a) \ kg/s$
$(b)$ No unit
$(c) \ kg /s^3$
$(d)$ 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
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?
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
$W = m \times g$
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 $\text{SI}$ 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, $W \alpha \ m$. 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
$(a) \ m/s$
$(b) \ m/s^2$
$(c)$ 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.
View full solution →$W = m \times g$
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 $\text{SI}$ 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, $W \alpha \ m$. 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
$(a) \ m/s$
$(b) \ m/s^2$
$(c)$ 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.
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 $(d^2)$ 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 $\text{SI}$ unit?
$(v)$ Two objects of masses $10\ kg$ and $20\ kg$ separated by distance $10m$. What is gravitational force between them?
View full solution →$(i)$ 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 $\text{SI}$ unit?
$(v)$ Two objects of masses $10\ kg$ and $20\ kg$ separated by distance $10m$. What is gravitational force between them?
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