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⁞ Physics

General Science ➤ Physics ➤ 2
Question 1
Q1.  What is the force of attraction between any two bodies by virtue of their masses is called?
 

Answer :  Gravitational Force


Gravitational Force is the force of attraction between any two bodies by virtue of their masses. It is a universal force and every object in the universe experiences gravitational force due to every other object.
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Question 2
Q2.  Which of these pairs has the same unit of measurement?
 

Answer :  Pressure and Coefficient of Elasticity


Pressure and Coefficient of Elasticity have the same unit i.e. N m-2 (Newton per metre square)
Other important units:

    Rate of Flow: m3s-1
    Acceleration: ms-2
    Rydberg constant: 1/m
    Gas constant: J/K Impulse: Ns
    Moment of Force: Nm

⚔ DISCUSS

Question 3
Q3.  A projectile will achieve maximum horizontal range at which angle?
 

Answer :  45°


A projectile will achieve maximum horizontal range when it is projected at an angle of 45°. This concept of maximum horizontal range is used by athletes in long jump, javelin throw, cricket ball throw etc
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Question 4
Q4.  Which of these is the cause of Friction?
 

Answer :  Both a and b


Friction is the force that opposes the relative motion between the two surfaces of objects in contact.
Friction is caused due to:
1. Roughness of surfaces in contact
2. Force of adhesion between the molecules of the surfaces in contact
⚔ DISCUSS

Question 5
Q5.  Work done will NOT be zero in which of the following case/cases?
 

Answer :  When angle between force and displacement vector is zero


Work done will be zero:
1. When displacement is zero
2. When force is zero
3. When angle between force and displacement vector is zero
⚔ DISCUSS

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