Test Details

Gravitation - NCERT

Class test

Jan 20, 1:45 PM

30 minutes

Jan 21, 2:10 PM

30.0 marks

MCQ

15 questions

V K PRAJAPATI

M.Sc Physics B.Ed LL.B

Class Details

Science (Physics)

Class IX A

Science (Physics)

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Question Text

Question 1 :
A ball weighing 4 kg of density $4000 kg m^{-3}$ is completely immersed in water of density $10^{3} kg m^{-3}$ Find the force of buoyancy on it. (Given $g = 10 m s^{-2}$)

Question 3 :
The mass of the earth is $6 \times 10^{24}$ kg and that of the moon is $7.4 \times 10^{22}]$ kg. If the distance between the earth and the moon is $3.84 \times 10^5$ km, What is the force exerted by the earth on the moon. (Take $G = 6.7 \times 10^{–11}\ N\ m^2\ kg^{-2}$)

Question 4 :
The motion of the moon around the earth is due to the _____________.

Question 6 :
A ball is thrown vertically upwards with a velocity of 49m/s. Calculate the maximum height to which it rises.

Question 7 :
A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g = 10 $m/s^2$,What is the net displacement and the total distance covered by the stone?

Question 9 :
Two objects of masses $ m_1$ and $m_2$ having the same size are dropped simultaneously from heights $ h_1$ and $h_2$ respectively. What will the ratio of time they would take in reaching the ground be if both of them are hollow, size remaining the same in each case?

Question 10 :
Relative density of silver is 10.8. The density of water is $10^3 \ kg/m^{3}$. What is the density of silver in SI unit?

Question 11 :
A boy is whirling a stone tied with a string in an horizontal circular path. If the string breaks, the stone :

Question 12 :
The density of an iron nail is _______ than the density of water

Question 13 :
How does the force of gravitation between two objects change when the distance between them is reduced to half ?

Question 14 :
In what direction does the buoyant force on an object immersed in a liquid act?

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