Test Details

Work and Energy,Gravitation - NCERT

Study point

Feb 26, 3:10 PM

60 minutes

Feb 27, 4:00 PM

55.0 marks

MCQ

25 questions

STUDY POINT CBSE ICSE

YOUR SUCCESS IS OUR SUCCESS

Class Details

Maths

Science

Class 9

Maths

Science

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Question Text

Question 1 :
What happens to the force between two objects, if the distance between the objects is tripled?

Question 2 :
What is the force of attraction between two unit point masses separated by a unit distance called?

Question 3 :
In a hypothetical case, if the diameter of the earth becomes half of its present value and its mass becomes four times of its present value, then how would the weight of any object on the surface of the earth be affected?

Question 4 :
The upward force exerted by the water on the bottle is known as-

Question 5 :
The weight of an object at the centre of the earth of radius R is ______.

Question 6 :
What happens to the force between two objects, if the masses of both objects are doubled?

Question 7 :
In the relation $F =\frac{ G M m}{d^2}$, the quantity G _____.

Question 8 :
An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be ____.

Question 9 :
A car falls off a ledge and drops to the ground in 0.5 s. Let $g = 10 \ m s^{–2}$ (for simplifying the calculations).What is its average speed during the 0.5 s?

Question 10 :
A ball thrown up vertically returns to the thrower after 6 s.What is the maximum height it reaches?

Question 12 :
Which of the following can be used to express energy? Symbols have their usual meanings for the units of physical quantities. (i) Wh   (ii) VC    (iii) VAs$^2$  (iv)  A$^2\Omega$s

Question 14 :
A machine gun fires $420$ bullets $per\ minute$. The velocity of each of the bullets is $300 m s^{-1}$ and the mass of each bullet is $1 gm$. The power of machine gun is:

Question 16 :
A 10 m long iron chain of linear mass density $0.8 \, kg \, m^{-1}$ is hanging freely from a rigid support. If $g = 10 \, ms^{-2}$, then the power required to lift the chain upto the point of support in 10 second:

Question 17 :
The potential energy of a body of mass $m$ isgiven by $U=px+qy+rz$. The magnitude of theacceleration of the body will be

Question 18 :
Assertion: kilowatt hour is the unit of electric power. Reason: watt hour has units of energy.

Question 19 :
In an hydroelectric power station, the height of dam is 10 m. How many kg of water must fall per second on the blades of a turbine in order to generate 1 MW of electric power?

Question 20 :
Power supplied to a particle of mass $2 \ kg$ varieswith time as$p=\cfrac{3}{2}t^{2} \ W$ . Here $t$ is in second. If velocity of particle at $t =0$ is $v= 0$. The velocity of particle at time $t = 2s$ will be :

Question 21 :
A point $P( \sqrt{3}R,0,0)$ lies on the axis of a ring of a mass $M$ and radius $R$. The ring is located in y-z plane with its centre at origin $O$. A small particle of mass $m$ starts from $P$ and reaches $O$ under gravitational attraction only. Its speed at $O$ will be :

Question 22 :
If the gravitational force had varied as $r^{-5/2}$ instead of $r^{-2}$; the potential energy of a particle at a distance '$r$' from the centre of the earth would be proportional to

Question 23 :
A particle of mass $m$ is projected from the surface of earth with a speed $V_{0}$ ($V_{0}$ < escape velocity). The speed of the particle at a height h$=$R (radius of the earth) is

Question 24 :
A mass is suspended from the end of a spring. When the system is oscillating the amplitude of oscillation is $4 \ cm$ and the maximum kinetic energy of oscillation of the system is $1\  joule$. Then the force constant of the spring is:

Question 25 :
The change in potential energy, when a body of mass $m$ is raised to a height $nR$ from the earth's surface is $(R=$ radius of earth$)$

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