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AP Intermediate 1st Year Work, Energy and Power — practice questions — page 2

Explore 56 free Work, Energy and Power questions in AP Intermediate 1st Year Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Work, Energy and Power questions and exercises with answers

Showing questions 31–56 of 56.

As per your syllabus, the unit kilowatt-hour (kWh) measures which physical quantity?Read the answer and worked solution →As per your syllabus, a 1800 kg elevator going up at 2 m/s against 4000 N friction needs minimum motor power approximately which?Read the answer and worked solution →As per your syllabus, + Summary, the dimensions of POWER are which?Read the answer and worked solution →As per your syllabus, an ELASTIC collision conserves which two quantities?Read the answer and worked solution →As per your syllabus, in an INELASTIC collision, which quantity is conserved (and which is not)?Read the answer and worked solution →As per your syllabus, eqn 5.22, in a COMPLETELY inelastic 1D collision (mass m₁ at v₁ hits m₂ at rest), the common final velocity is which?Read the answer and worked solution →As per your syllabus, eqn 5.26 / 5.27, in an ELASTIC 1D collision of m₁ (v₁) with m₂ (at rest), the final velocity v_{1f} is which?Read the answer and worked solution →As per your syllabus, (2D elastic between EQUAL masses, one at rest), the two final velocities make which angle with each other?Read the answer and worked solution →As per your syllabus, two cars colliding and locking together (no rebound) is an example of which collision type?Read the answer and worked solution →As per your syllabus, during the collision interval itself, conservation of momentum holds at which moments?Read the answer and worked solution →As per your syllabus, how many conservation equations does linear momentum yield in 3D?Read the answer and worked solution →NEET · Physics · Work, Energy & Power — FormulasRead the answer and worked solution →The SI unit of work and energy is:Read the answer and worked solution →The work–energy theorem states that the net work done on a body equals:Read the answer and worked solution →Kinetic energy of a body of mass m moving with speed v is:Read the answer and worked solution →A body of mass 5 kg is raised vertically by 4 m at constant velocity (g = 10 m s⁻²). The work done against gravity is:Read the answer and worked solution →A force of 10 N acts on a 2 kg body at rest. After 5 s, the kinetic energy of the body is:Read the answer and worked solution →The gravitational potential energy of a body of mass m at height h near the Earth's surface (taking surface as reference) is:Read the answer and worked solution →A body is dropped from height h. Just before it hits the ground, its speed is:Read the answer and worked solution →A 60 W bulb burns for 2 hours. The total energy consumed in kWh is:Read the answer and worked solution →A pump lifts water at a rate of 3000 kg per minute through 30 m (g = 10 m s⁻²). The minimum power of the pump is:Read the answer and worked solution →Two bodies of masses m₁ and m₂ have equal kinetic energies. The ratio of their momenta p₁/p₂ is:Read the answer and worked solution →In a one-dimensional elastic collision between a moving body and an equal-mass stationary body, the moving body after collision:Read the answer and worked solution →A spring with spring constant k is compressed by x. The elastic potential energy stored is:Read the answer and worked solution →In a perfectly inelastic collision between two bodies:Read the answer and worked solution →A particle moves under a force F = −k x. The motion is:Read the answer and worked solution →

Worked practice questions

As per your syllabus, the unit kilowatt-hour (kWh) measures which physical quantity?

  1. Power
  2. Voltage
  3. Energy
  4. Force
Show answer and solution

Correct answer: C. Energy

Your syllabus: kWh = power × time = energy. Used in electricity bills. 1 kWh = 3.6 × 10⁶ J.

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As per your syllabus, a 1800 kg elevator going up at 2 m/s against 4000 N friction needs minimum motor power approximately which?

  1. 8 kW
  2. 100 kW
  3. 17.6 kW
  4. 44.3 kW
Show answer and solution

Correct answer: D. 44.3 kW

syllabus Ex 5.10: F_motor = m g + f = 1800·9.8 + 4000 = 21640 N. P = F·v = 21640 × 2 ≈ 43.3 kW ≈ 44.3 kW.

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As per your syllabus, + Summary, the dimensions of POWER are which?

  1. [M L² T⁻³]
  2. [M L T⁻²]
  3. [M L T⁻¹]
  4. [M L² T⁻²]
Show answer and solution

Correct answer: A. [M L² T⁻³]

Your syllabus: power = energy / time = [M L² T⁻²]/[T] = [M L² T⁻³]. SI unit watt.

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