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Work and Energy

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Scientific Concept of Work

Subtopic

Scientific Concept of Work under Work and Energy for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Calculate the work done when a force of 10 N10\ N displaces a body by 10 m10\ m in its own direction.

    A.

    1 J1\ J

    B.

    10 J10\ J

    C.

    100 J100\ J

    D.

    0 J0\ J

  2. 2.

    A boy carries a bucket of water and walks 5 m5\ m on a level road. The work done by the boy against gravity is:

    A.

    5 J5\ J

    B.

    50 J50\ J

    C.

    0 J0\ J

    D.

    25 J25\ J

  3. 3.

    The work done on an object does NOT depend upon the:

    A.

    Displacement

    B.

    Force applied

    C.

    Initial velocity of the object

    D.

    Angle between force and displacement

Download the worksheet for Work and Energy - Scientific Concept of Work to practice offline. It includes additional chapter-level practice questions.

Forms of Energy (Kinetic and Potential)

Subtopic

Forms of Energy (Kinetic and Potential) under Work and Energy for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following is equivalent to 1 Joule1\, Joule?

    A.

    1 kg⋅m/s1\, kg \cdot m/s

    B.

    1 N⋅m1\, N \cdot m

    C.

    1 kg⋅m2/s1\, kg \cdot m^2/s

    D.

    1 N/m1\, N/m

  2. 2.

    The law of conservation of energy states that energy can be:

    A.

    Created

    B.

    Destroyed

    C.

    Transformed from one form to another

    D.

    Used up completely

  3. 3.

    If two bodies have equal mass, the one moving faster has:

    A.

    Less kinetic energy

    B.

    More kinetic energy

    C.

    More potential energy

    D.

    Less potential energy

Download the worksheet for Work and Energy - Forms of Energy (Kinetic and Potential) to practice offline. It includes additional chapter-level practice questions.

Law of Conservation of Energy

Subtopic

Law of Conservation of Energy under Work and Energy for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A stretched spring has potential energy. When it is released, this energy converts into:

    A.

    Chemical energy

    B.

    Kinetic energy

    C.

    Nuclear energy

    D.

    Magnetic energy

  2. 2.

    In most energy transformations, some energy is released as 'waste' heat. Does this violate the law of conservation of energy?

    A.

    Yes, because energy is lost.

    B.

    No, because the total energy including the heat remains constant.

    C.

    Yes, because heat is not a form of energy.

    D.

    No, because energy is created during friction.

  3. 3.

    Joule is the unit of:

    A.

    Energy only

    B.

    Work only

    C.

    Both work and energy

    D.

    Power

Download the worksheet for Work and Energy - Law of Conservation of Energy to practice offline. It includes additional chapter-level practice questions.

Power

Subtopic

Power under Work and Energy for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the power of a machine that does 900 J900 \text{ J} of work in 18 seconds18 \text{ seconds}?

    A.

    50 W50 \text{ W}

    B.

    16200 W16200 \text{ W}

    C.

    100 W100 \text{ W}

    D.

    18 W18 \text{ W}

  2. 2.

    If power PP and work WW are known, what is the formula for time tt?

    A.

    t=P/Wt = P / W

    B.

    t=W/Pt = W / P

    C.

    t=W×Pt = W \times P

    D.

    t=1/(W×P)t = 1 / (W \times P)

  3. 3.

    0.05 kW0.05 \text{ kW} is how many Watts?

    A.

    5 W5 \text{ W}

    B.

    50 W50 \text{ W}

    C.

    500 W500 \text{ W}

    D.

    0.5 W0.5 \text{ W}

Download the worksheet for Work and Energy - Power to practice offline. It includes additional chapter-level practice questions.

Work and Energy - CBSE Class 9 Science Notes & Revision | Krit.club