Concept of System

Q.

Forces proportional to $AB$, $BC$and $2CA$act along the sides of triangle $ABC$ in order, their resultants represented in magnitude and direction is

1. $CA$

2. $AC$

3. $BC$

4. $CB$

Q.

Choose the correct statement:

Statement 1: A body moves along the direction of force.

Statement 2: A body moves in the direction of velocity.

Statement 3: Forces acting inside the system are called interior forces.

Statement 4: Forces acting outside the system are called external forces.

1. All statements are correct.

2. Except statement 2, all other statements are correct.

3. Except statement 2 and 3, all other statements are correct.

4. Only statement 2 and 4 are correct.

Q. Momentum of an object is the product of its mass and velocity.

1. True
2. False

Q. The momentum of a body is given as the product of its mass and its .

1. velocity
2. acceleration
3. displacement

Q.

A mass m₁ has a velocity of u and mass m₂ has a velocity of v. Then find the individual momentum of mass m₁ and mass m₂ respectively.

1. $m_{1}v$ and $m_{2}u$

2. Both have zero momentum

3. $m_{1}u$ and $m_{2}v$

4. $m_1(u+v)$ and $m_2(u+v)$

Q. What is the basis of unification of forces.

Q. When the velocity of an object is , its momentum gets doubled.

1. doubled
2. halved
3. constant

Q. Question 9
What is the momentum of an object of mass m, moving with a velocity v?
(a) $(mv{)}^2$
(b) $m{v}^2$
(c) $\frac{1}{2}m{v}^2$
(d) mv

Q. What is the momentum of a man of mass $100\text{kg}$ when he walks with a uniform velocity of $2{\text{m s}}^{-1}$?

a) $300{\text{kg m s}}^{-1}$
b) $50{\text{kg m s}}^{-1}$
c) $100{\text{kg m s}}^{-1}$
d) $200{\text{kg m s}}^{-1}$

[1 Mark]
[Momentum]

Q. What is the momentum of an object of mass m, moving with a velocity v?

1. $m{v}^2$
2. $(mv{)}^2$
3. $\frac{1}{2}m{v}^2$
4. $mv$

Q. This section contains 1 Assertion-Reason type question, which has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (a), (b), (c) तथा (d) दिये गये हैं, जिनमें से केवल एक सही है।

A : A body at rest explodes into two equal parts, then they move with same speed in opposite direction.

A : विराम पर स्थित एक पिण्ड दो समान भागों में विस्फोटित होता है, तब ये समान चाल से विपरीत दिशा में गति करते हैं।

R : Conservation of linear momentum.

R : रेखीय संवेग संरक्षण।

1. Both (A) and (R) are true and (R) is the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं लेकिन (R), (A) का सही स्पष्टीकरण नहीं है
3. (A) is true but (R) is false
   
   (A) सही है लेकिन (R) गलत है
4. (A) is false but (R) is true
   
   (A) गलत है लेकिन (R) सही है

Q. Momentum is a scalar quantity.

1. True
2. False

Q.

A mass m₁ has a velocity of u and mass m₂ has a velocity of v. Then find the individual momentum of mass m₁ and mass m₂ respectively.

1. M₁v and M₂u

2. Both have zero momentum

3. M₁u and M₂v

4. None of the above

Q. Momentum of a body is defined to be the product of its mass and:

1. speed
2. velocity
3. acceleration
4. none of these

Q.

A mass m₁ has a velocity of u and mass m₂ has a velocity of v. Then find the individual momentum of mass m₁ and mass m₂ respectively.

1. $m_{1}v$ and $m_{2}u$

2. Both have zero momentum

3. $m_{1}u$ and $m_{2}v$

4. $m_1(u+v)$ and $m_2(u+v)$

Q.

Mention the unit of momentum.

Q. Train A runs from east to west and another train B of the same mass runs from west to east at the same speed along the equator. A presses the track with a force F1 and B presses the track with a force F2 then
A. F1>F2
B. F1C. F1=F2
D. Data insufficient

Q.

Choose the correct statement:

Statement 1: A body moves along the direction of force.

Statement 2: A body moves in the direction of velocity.

Statement 3: Forces acting inside the system are called interior forces.

Statement 4: Forces acting outside the system are called external forces.

1. Except statement 2, all other statements are correct.

2. All statements are correct.

3. Except statement 2 and 3, all other statements are correct.

4. Only statement 2 and 4 are correct.