Work And Energy Test

Work And Energy

This is Work and Energy 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
Statement A: Any physical or mental activity is termed as work done in physics. Statement B: Work is said to be + ve work done when the body is displaced in the direction of applied force. Which of the two statements is true?
  • A
    both a and b
  • B
    none of the above.
  • C
    statement B
    Correct
  • D
    statement A
2
Find the correct statement
  • A
    1 Gigawatt is equal to \({\text{1}}{0^{\text{9}}}\)W
  • B
    none of these
  • C
    power is the rate of doing work
  • D
    both a and b
    Correct
3
An electric lamp of 100w is used for 5 hours per day calculate the units of energy consumed by lamp in one day
  • A
    0.5 unit
    Correct
  • B
    none of these
  • C
    1.5 units
  • D
    1 unit
4
In which of the following activities the work is said to be done?
  • A
    Pinki is walking on a level road with a book on his head.
  • B
    Khushi is pushing a wall of a house but fails to do so
  • C
    Shruti is stretching a string.
    Correct
  • D
    Harsh is reading a book
5
Match the following with correct response. (1) Work (2) Power (3) Power (4) Force (A) Watt (B) Newton (C) Kilowatt hour (D) Joule
  • A
    1-C, 2-B, 3-D, 4-A
  • B
    1-A, 2-C, 3-B, 4-D
  • C
    1-D, 2-A, 3-C, 4-B
    Correct
  • D
    1-B, 2-D, 3-A, 4-C
6
Match the following with correct response. (1) W (2) 1 KW (3) 1 KWh (4) 1 HP (A) Nm (B) \(3.6 \times {10^6}J\)(C) 1000W (D) 746 W
  • A
    1-D, 2-A, 3-C, 4-B
  • B
    1-B, 2-D, 3-A, 4-C
  • C
    1-A, 2-C, 3-B, 4-D
    Correct
  • D
    1-C, 2-B, 3-D, 4-A
7
Which of the following is unit of energy A Newton metre B Joule C Kilowatt hours D Kilowatt
  • A
    All of these
  • B
    (a), (b) and (c) are correct
    Correct
  • C
    (b) and (c) are correct
  • D
    (a) and (b) are correct
8
It is necessary to do the work A A force is acted on the object B Object is displaced C A force is acted on object it is not displaced D All of the above
  • A
    (a) and (b) are correct
    Correct
  • B
    (a), (b) and (c) are correct
  • C
    All of these
  • D
    (b) and (c) are correct
9
K. E of a body is always
  • A
    +ve
    Correct
  • B
    –ve
  • C
    depends on the situation
  • D
    zero
10
If momentum of a body is doubled, the K. E becomes
  • A
    three times
  • B
    2 times
  • C
    four times
    Correct
  • D
    half.
11
In a watch P. E of wound spring is converted into
  • A
    chemical energy
  • B
    mechanical energy
  • C
    electrical energy
  • D
    K. E of hands of watch
    Correct
12
A body is thrown vertically upwards, during its rise the P. E _________ and K. E __________
  • A
    remains same remains same
  • B
    decreases, increases
  • C
    all of these
  • D
    increases, decreases
    Correct
13
The point of maximum K. E in case of oscillating pendulum is _______________ position.
  • A
    Extreme
  • B
    same at both position
  • C
    med print of mean and extreme
  • D
    Mean
    Correct
14
In which of the following mentioned activities, the P. E is converted into K.E.
  • A
    when a pendulum swings
    Correct
  • B
    explosion of an atomic bomb
  • C
    explosion of a fire cracker
  • D
    when torch is switched on
15
The gravitational P. E depends on
  • A
    mass
  • B
    height
  • C
    both a and c
    Correct
  • D
    velocity