Forces And Laws Of Motions Test

Forces And Laws Of Motions

This is Forces and Laws of Motions Test-04 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
“Inflated balloon lying on the surface of a floor moves forward when pierced with a pin. The above mentioned phenomena is due to
  • A
    Newton’s second law of motion
  • B
    Newton’s third law of notion
    Correct
  • C
    Newton’s fist law of motion
  • D
    conservation of energy
2
The change in the momentum of a body in 0.01 second is 10 kg ms-1. The force acting on this body is
  • A
    0.1N
  • B
    1000N
    Correct
  • C
    10N
  • D
    100N
3
Statement A: Rocket can propel its self in vacuum. Statement B: Newton’s laws are universal. Which of the two statements is true?
  • A
    both A and B
    Correct
  • B
    none of these
  • C
    statement B
  • D
    statement A
4
A ball is dropped from a height of 10m. Ball is embedded in sand of 1m and stops.
  • A
    only momentum remains conserved
  • B
    Neither K.E nor momentum is conserved.
  • C
    both momentum and kinetic energy are conserved
  • D
    only kinetic energy remains conserved
    Correct
5
Two bodies of masses 1kg and 5kg are dropped gently from the top of a tower. At a point 50cm from the ground both the bodies will have the same
  • A
    Total energy.
  • B
    velocity
    Correct
  • C
    K.E
  • D
    momentum
6
Statement A: Calculus, a new branch of mathematics was stated by Newton. Statement B: If mass remains same, doubling the force will reduce the acceleration to half. Which of the above two statements is true
  • A
    statement A
    Correct
  • B
    both a and b
  • C
    none of these
  • D
    statement B
7
If an object experiences a net zero unbalanced force, than the body
  • A
    cannot remain at rest
  • B
    none of these
  • C
    moves with constant velocity
    Correct
  • D
    can be accelerated
8
Statement A: A passenger falls forward when a bus suddenly starts moving in the forward direction Statement B: A gun recoils backward with small speed than the bullet moving forward.
  • A
    statement A is true
  • B
    both the statement A and B are true
  • C
    neither statement A nor Statement B is true
  • D
    statement B is true
    Correct
9
Match the following with correct response. (1) Inertia (2) Friction (3) Momentum(4) Force (A) Product of mass and velocity (B) Mass of the object (C) Rate of change of momentum (D) Necessary evil
  • A
    1-D, 2-A, 3-C, 4-B
  • B
    1-A, 2-C, 3-B, 4-D
  • C
    1-C, 2-B, 3-D, 4-A
  • D
    1-B, 2-D, 3-A, 4-C
    Correct
10
Match the following with correct response. (1) Newton’s first law of motion (2) Newton’s second law of motion (3) Newton’s third law of motion (4) Galileo’s law of inertia (A) The acceleration produced is directly proportional to product of mass & force applied (B) When no force is exerted on an object it stays at rest or it moves in a straight light with constant speed (C) To every action there is an equal & opposite reaction (D) An object at rest or in uniform motion, will remain at rest or uniform motion unless an unbalanced force is applied on it
  • A
    1-B, 2-D, 3-A, 4-C
  • B
    1-A, 2-C, 3-B, 4-D
  • C
    1-D, 2-A, 3-C, 4-B
    Correct
  • D
    1-C, 2-B, 3-D, 4-A
11
Match the following with correct response. (1) Force (2) Momentum (3) Unbalanced force (4) Principle on rocket works (A) Newton (B) Acceleration (C) Kg m/s (D) Newton’s third law of motion
  • A
    1-B, 2-D, 3-A, 4-C
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-A, 2-C, 3-B, 4-D
    Correct
  • D
    1-D, 2-A, 3-C, 4-B
12
Match the following with correct response. (1) Friction (2) Limiting friction (3) Sliding friction (4) Rolling friction (A) when one object rolls over another (B) Force just sufficient to move the object (C) Force which opposes motion (D) Force sufficient to slide one object over another
  • A
    1-C, 2-B, 3-D, 4-A
    Correct
  • B
    1-D, 2-A, 3-C, 4-B
  • C
    1-B, 2-D, 3-A, 4-C
  • D
    1-A, 2-C, 3-B, 4-D
13
Match the following with correct response. (1) Unbalanced force (2) Unchangingtendency (3) Method of reducing friction (4) Rate of change of momentum (A) Applying grease (B) Change in state (C) Force (D) Inertia
  • A
    1-D, 2-A, 3-C, 4-B
  • B
    1-B, 2-D, 3-A, 4-C
    Correct
  • C
    1-A, 2-C, 3-B, 4-D
  • D
    1-C, 2-B, 3-D, 4-A
14
Match the following with correct response. (1) F(2) P(3) \(\Delta P\)(4) Momentum before collision (A) \(m \times v\)(B) Momentum after collision are equal (C) \(\frac{{{P_2} - {P_1}}}{t}\)(D) \(m \times a\)
  • A
    1-D, 2-A, 3-C, 4-B
    Correct
  • B
    1-B, 2-D, 3-A, 4-C
  • C
    1-C, 2-B, 3-D, 4-A
  • D
    1-A, 2-C, 3-B, 4-D
15
Which is correct about frictional force & gravitational force? A Friction force always produces retardation while gravitational force Produces acceleration also B Both produces retardation C Frictional for acts when two surfaces are in contact D Gravitational force acts when the object is at height 12
  • A
    (a) and (b) are correct
  • B
    (b) and (c) are correct
  • C
    All of these
  • D
    (a), (c) and (d) are correct
    Correct