The radius of planet A is half the radius of planet B. If the mass of A is MA, what must be the mass of B so that the value of g on B is half that of its value on A?
Concept: Variation in Value of g
What will be the weight of a person on earth, who weighs 9N on the moon?
Concept: Earth’s Gravitational Acceleration
A ball falls off a table and reaches the ground in 1 s. Assuming g=10 m/s2, calculate its speed on reaching the ground and the height of the table.
Concept: Escape velocity
i) If g = GM/r2 then where will the value of g be high at Goa Beach or on top of Mount Everest?
Concept: Earth’s Gravitational Acceleration
Identify the law shown in the figure and state three respective laws.
Concept: Kepler’S Laws
For freely falling object we can write the Newton’s second equation of motion as …..
Concept: Earth’s Gravitational Acceleration
Write proper answer in the box:
If `"F" = ("G""m"_1"m"_2)/"d"^2` then F = ______
Concept: Concept of Gravitation
A metal ball of mass 5 kg falls from a height of 490 m. How much time it will take to reach the ground? (g = 9.8 m/s2)
Concept: Free Fall
What would be the value of ‘g’ on the surface of the earth if its mass was twice and its radius half of what it is now ?
Concept: Earth’s Gravitational Acceleration
Fill in the blank:
The modern periodic table consists of ……………. periods.
Concept: The Modern Periodic Table
Fill in the blank:
The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.
Concept: Trends in the Modern Periodic Table
What are the main features of Mendeleev’s periodic table?
Concept: Mendeleev’s Periodic Table
The element eka-silicon in Mendeleev’s periodic table is known as ………… in the modern periodic table.
Concept: Merits of Mendeleev’s Periodic Table
Elements in the same group show the same valency. Give scientific reason.
Concept: Trends in the Modern Periodic Table
Write the electronic configuration of K and Ne.
Concept: Trends in the Modern Periodic Table
The law used by Newlands to arrange elements is known as........... .
Concept: Newland's Law of Octaves
The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.
- Calculate the average atomic mass of elements A and C.
- Compare the average atomic mass with atomic mass of B.
- What could the elements A, B and C be?
Concept: Trends in the Modern Periodic Table
Classify the following elements into metals, non-metals and metalliods
As, C, Hg, Mg, S, Si
Concept: Trends in the Modern Periodic Table
The arrangement of elements in a group of three is known as ________.
Concept: Dobereiner’s Triads
Write the merits of the modern periodic table over Mendeleev’s Periodic table
Concept: The Modern Periodic Table
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