Forces And Laws Of Motions Test

Forces And Laws Of Motions

This is Forces and Laws of Motions Test-02 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Some of the leaves may get detached from a tree if we vigorously shake its branch because of
  • A
    newton’s I law of motion
    Correct
  • B
    newton’s III law of motion
  • C
    conservation of energy
  • D
    newton’s II law of motion
2
Inertia is the property of a body by virtue of which the body is
  • A
    unable to change itself the direction of motion
  • B
    all of these
    Correct
  • C
    unable to change by itself the state of rest
  • D
    unable to change itself the state of motion
3
Which has more inertia?
  • A
    5Rs coin
    Correct
  • B
    1Rs coin
  • C
    5Rs note
  • D
    All have same inertia.
4
A high jumper runs for a while before taking high jump so that the inertia of __________ help him in taking a long jump.
  • A
    rest
  • B
    direction
  • C
    motion
    Correct
  • D
    shape
5
If P and Q are two bodies with masses 10 kg and 5kg respectively, then which body has more inertia?
  • A
    none of these.
  • B
    both bodies P and Q have equal inertia
  • C
    body Q
  • D
    body P
    Correct
6
In a football and stone of same size, the inertia of A Football is greater B Football is lesser C Stone is greater D Stone is lesser
  • A
    (a), (b) and (c) are correct
  • B
    (a) and (b) are correct
  • C
    (b) and (c) are correct
    Correct
  • D
    All of these
7
Dust particles come out of a hanging carpet when we strike it with a stick because- A Carpet starts moving forward and backward due to inertia of motion B Dust particles remain at rest C Dust particles starts moving forward due to inertia of motion D Carpet remains at rest
  • A
    All of these
  • B
    (a), (b) and (c) are correct
  • C
    (a) and (b) are correct
    Correct
  • D
    (b) and (c) are correct
8
A force of 7 kg-wt acts on a body of mass 10 kg calculate the acceleration produced.
  • A
    \({\text{8 m}}{{\text{s}}^{ - {\text{2}}}}{\text{ }}\)
  • B
    \({\text{7 m}}{{\text{s}}^{ - {\text{2}}}}{\text{ }}\)
    Correct
  • C
    \({\text{1}}0{\text{ m}}{{\text{s}}^{ - {\text{2}}}}\;{\text{ }}\;\)
  • D
    \({\text{6 m}}{{\text{s}}^{ - {\text{2}}}}{\text{ }}\)
9
The physical quantity which is equal to the rate of change of momentum is
  • A
    force
    Correct
  • B
    impulse
  • C
    energy
  • D
    power
10
Which of the following physical quantity is associated with Newton’s second law of motion?
  • A
    mass
  • B
    all of these
    Correct
  • C
    time
  • D
    velocity
11
State whether the following statement is true or false “force can be measured using first law of motion”
  • A
    true
  • B
    partially true
  • C
    partially false
  • D
    false
    Correct
12
“A body moves with a constant speed of 5m/s. This shows that no unbalanced forces are acting on the body” is a
  • A
    partially false
  • B
    partially true
  • C
    false statement
  • D
    true statement
    Correct
13
Same amount of force is acting on a car and bus. It the ratio of the mass of the bus and the car is 50:1, calculate the ratio of the acceleration produced in the car to the acceleration produced in the bus
  • A
    25:1
  • B
    1:50
  • C
    50:1
    Correct
  • D
    1:25
14
A force of 100N applied on an object accelerates it with an acceleration of\({\text{2m}}{{\text{s}}^{ - {\text{2}}}}\). How much force is required to produce the same acceleration when identical object of same mass is tied with the first object?
  • A
    50N
  • B
    300N
  • C
    100N
  • D
    200N (Ans)
    Correct
15
Which would require a greater force – accelerating a body A of mass 2kg at \({\text{5m}}{{\text{s}}^{ - {\text{2}}}}{\text{ }}\)or a body B of mass 5kg at 2ms-2?
  • A
    both have equal forces
    Correct
  • B
    body A
  • C
    body B
  • D
    none of these