Work And Energy Test

Work And Energy

This is Work and Energy 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
According to the law of conservation of energy
  • A
    Energy can be transformed from one from to another
  • B
    All of the above
    Correct
  • C
    Energy can’t be destroyed
  • D
    Energy can’t be created
2
A ball is dropped from a height ‘h’. The velocity of the ball when it reaches the ground is 10 m/s. Find ‘h’. (\({\text{g }} = {\text{ 1}}0{\text{m}}{{\text{s}}^{ - {\text{2}}}}\))
  • A
    5m
    Correct
  • B
    10m
  • C
    12m
  • D
    5.6m
3
Statement A: Mechanical energy of a system is always conserved. Statement B: The total energy of the system is always conserved. Which of the two statements is true?
  • A
    both a and b
  • B
    statement A
  • C
    none of the above
  • D
    statement B
    Correct
4
Match the following with correct response. (1) Battery (2) Bulb (3) Steam engine (4) Microphone (A) Electrical energy converts into light energy (B) Sound energy converts into electrical energy (C) Steam energy converts into mechanical energy (D) Chemical energy converts into electrical energy
  • A
    1-A, 2-C, 3-B, 4-D
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-D, 2-A, 3-C, 4-B
    Correct
  • D
    1-B, 2-D, 3-A, 4-C
5
Work done by the gravitational force of earth on a satellite along a circular path is
  • A
    minimum
  • B
    max
  • C
    all of these
  • D
    O
    Correct
6
The linear momentum of a body of mass 2kg is\({\text{16kgm}}{{\text{s}}^{ - {\text{1}}}}\). What is its K. E?
  • A
    60J
  • B
    64J
    Correct
  • C
    70J
  • D
    none of these
7
Can there be displacement of object in the absence of any force acting on it?
  • A
    no
  • B
    yes
    Correct
  • C
    information not enough
  • D
    none of these
8
Which provides more energy to human body after digestion?
  • A
    1kg of potatoes
  • B
    1kg of rice
  • C
    1kg of butter
    Correct
  • D
    1kg of salad
9
Statement A: If two bodies have same K. E, then their momentum will also be equal Statement B: Work done by centripetal force is always greater than zero.
  • A
    statement B is true, A is false
  • B
    statement A is true, B is false
  • C
    neither statement A nor statement B is true.
    Correct
  • D
    both the statement A and B are true
10
Match the following with correct response. (1) Kinetic energy (2) Potential energy (3) Work (4) Power (A) Energy due to position (B) The rate of doing work (C) Force displaces an object in the direction of force (D) Energy due to motion
  • A
    1-A, 2-C, 3-B, 4-D
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-D, 2-A, 3-C, 4-B
    Correct
  • D
    1-B, 2-D, 3-A, 4-C
11
Match the following with correct response. (1) Velocity effects (2) Maximum work done (3) Work done is zero (4) Work done, when force act obliquely (A) Energy (B) \(90^\circ \)(C) \(O^\circ \)(D) \(F \times S \times \cos \theta \)
  • A
    1-B, 2-D, 3-A, 4-C
  • B
    1-D, 2-A, 3-C, 4-B
  • C
    1-C, 2-B, 3-D, 4-A
  • D
    1-A, 2-C, 3-B, 4-D
Answer
Not Available
12
Match the following with correct response. (1) Law of conservation of energy (2) Stretched rubber band possess (3) At mean position pendulum attains maximum (4) Various energy forms are (A) kinetic energy (B) Energy neither be created nor be destroyed (C) Interconvertible (D) Potential energy
  • A
    1-B, 2-D, 3-A, 4-C
    Correct
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-A, 2-C, 3-B, 4-D
  • D
    1-D, 2-A, 3-C, 4-B
13
Match the following with correct response. (1) Nm is also called (2) Free fall (3) A donkey is working with a load on its back (4) An engine is pulling train (A) Potential energy is equal tokinetic energy (B) Work done (C) No work done (D) Erg
  • A
    1-D, 2-A, 3-C, 4-B
    Correct
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-B, 2-D, 3-A, 4-C
  • D
    1-A, 2-C, 3-B, 4-D
14
Which of the following statement are incorrect A A bird sitting on tree possess potential energy only B A stationary object may have energy C A flying bird has kinetic energy only D An aeroplane running on the run- way possess kinetic & potential energy both
  • A
    All of these
  • B
    (b) and (c) are correct
  • C
    (a), (b) and (c) are correct
  • D
    (c) and (d) are correct
    Correct
15
Which of the following is not a vector quantity A Energy B Kinetic energy C Work done D Power
  • A
    (b) and (c) are correct
  • B
    (a), (b) and (c) are correct
  • C
    (a) and (b) are correct
  • D
    All of these
    Correct