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Work and Energy Science - Work and Energy

Bihar Board (BSEB) - STD 9 - Science (BSEB - English Medium). 166 questions in this chapter.

Question types

Work and Energy question types

166 questions across 6 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

166
Questions
6
Question groups
5
Question types
Sample Questions

Work and Energy questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q. [1 M]1 Mark
The device which converts mechanical energy into energy which runs our microwave oven is:
  • A
    Electric motor.
  • ✓
    Alternator.
  • C
    Turbine.
  • D
    Electric heater.

Answer: B.

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Q 2M.C.Q. [1 M]1 Mark
The work done on an object does not depend on the:
  • A
    Displacement.
  • B
    Angle between force and displacement.
  • C
    Force applied.
  • ✓
    Initial velocity of the object.

Answer: D.

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Q 3M.C.Q. [1 M]1 Mark
In case of negative work, the angle between the force and displacement is:
  • A
    $0^\circ $
  • B
    $45^\circ$
  • C
    $90^\circ$
  • ✓
    $180^\circ $

Answer: D.

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Q 4M.C.Q. [1 M]1 Mark
A girl is carrying a school bag of 3kg mass on her back and moves $200\ m$ on a levelled road. If the value of g be $10m/s^2,$ the work done by the girl against the gravitational force will be:
  • A
    $6000J$
  • B
    $0.6J$
  • ✓
    $0J$
  • D
    $6J$

Answer: C.

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Q 5M.C.Q. [1 M]1 Mark
A car is accelerated on a levelled road and acquires a velocity $4$ times of its initial velocity. During this process, the potential energy of the car:
  • ✓
    Does not change.
  • B
    Becomes twice that of initial potential energy.
  • C
    Becomes $4$ times that of initial potential energy.
  • D
    Becomes $16$ times that of initial potential energy.

Answer: A.

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Q 18Que-Ans (Each of 2 Mark )2 Marks
In an experiment to measure his power, a student records the time taken by him in running in a flight of steps on a staircase. Use the following data to calculate the power of the student: Number of steps = $28$ Height of each step = $20cm$ Time taken = $5.4s$ Mass of student = $55kg$ Acceleration = $9.8ms^{-2}$ Due to gravity.
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Q 19Que-Ans (Each of 2 Mark )2 Marks
A man is instructed to carry a package from the base camp at $B$ to submit A of a hill at a height of $1200$ metres. The man weighs 800N and the package weighs $200N$. If $g = 10m/s^2$,
  1. How much work does man do against gravity?
  2. What is the potential energy of the package at $A$ if it is assumed to be
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Q 20Que-Ans (Each of 2 Mark )2 Marks
The work done by a force acting obliquely is given by the formula: $\text{W} =\text{F}\cos\theta\times\text{s}.$ What will happen to the work done if angle between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant?
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Q 21Que-Ans (Each of 3 Mark )3 Marks
A body of mass $2$ $kg$ is thrown vertically upwards with an initial velocity of $20 \mathrm{~m} / \mathrm{s}$. What will be its potential energy at the end of $2$ $s$ ? (Assume $\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ ).
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Q 22Que-Ans (Each of 3 Mark )3 Marks
A man drops a $10$ $kg$ rock from the top of a $5$ $m$ ladder. What is its speed just before it hits the ground? What is its kinetic energy when it reaches the ground? $\left(8=10 \mathrm{~m} / \mathrm{s}^2\right)$
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Q 25Que-Ans (Each of 3 Mark )3 Marks
A weightlifter is lifting weights of mass $200$ $kg$ up to a height of $2$ metres. If $\mathrm{g}=9.8 \mathrm{~ms}^{-2}$, Calculate:
a. Potential energy acquired by the weights.
b. Work done by the weightlifter.
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Q 30Que-Ans (Each of 5 Mark )5 Marks
A bullet of mass $15g$ has a speed of $400m/s$. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in $2cm$, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?
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