NCERT Class 9 Science MCQ Chapter 7 Work, Energy, and Simple Machines English Medium As Per New Syllabus. NCERT Class 9 Science MCQ Chapter 7 Work, Energy, and Simple Machines Notes to each chapter is provided in the list so that you can easily browse throughout different chapter NCERT Class 9 Science MCQ Chapter 7 Work, Energy, and Simple Machines Question Answer Download PDF and select needs one. CBSE Class 9 Science Multiple Choice Solutions.
NCERT Class 9 Science MCQ Chapter 7 Work, Energy, and Simple Machines
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Work, Energy, and Simple Machines
Chapter – 7
| MCQ |
Tick the Correct Options:
1. What is the scientific definition of work done by a constant force on an object?
(a) Force × Time.
(b) Mass × Acceleration.
(c) Force × Displacement in the direction of the force.
(d) Mass × Velocity.
Ans: (c) Force × Displacement in the direction of the force.
2. What is the SI unit of work?
(a) Newton.
(b) Watt.
(c) Pascal.
(d) Joule.
Ans: (d) Joule.
3. 1 Joule of work is equal to:
(a) 1 kg × 1 m.
(b) 1 N × 1 m.
(c) 1 W × 1 s.
(d) 1 N / 1 m.
Ans: (b) 1 N × 1 m.
4. If you apply a force on a rigid wall and there is no displacement, what is the work done on the wall?
(a) Positive.
(b) Negative.
(c) Zero.
(d) Infinite.
Ans: (c) Zero.
5. If a force acts in a direction perpendicular to the displacement of an object, the work done by that force is:
(a) Maximum.
(b) Positive.
(c) Negative.
(d) Zero.
Ans: (d) Zero.
6. When the displacement is in the same direction as the applied force, the work done by the force is said to be:
(a) Zero.
(b) Negative.
(c) Positive.
(d) Infinite.
Ans: (c) Positive.
7. What type of work does a goalkeeper do on a moving football when catching and stopping it?
(a) Positive work.
(b) Negative work.
(c) Zero work.
(d) Maximum work.
Ans: (b) Negative work.
8. According to the work-energy theorem, the work done on an object is equal to:
(a) Its total mass.
(b) Its change in velocity.
(c) The force applied.
(d) The change in its energy.
Ans: (d) The change in its energy.
9. An object having the capacity to do work is said to possess:
(a) Power.
(b) Momentum.
(c) Energy.
(d) Acceleration.
Ans: (c) Energy.
10. The SI unit of energy is the same as the SI unit of:
(a) Force.
(b) Power.
(c) Work.
(d) Momentum.
Ans: (c) Work.
11. The energy possessed by an object due to its motion is called:
(a) Potential energy.
(b) Kinetic energy.
(c) Thermal energy.
(d) Chemical energy.
Ans: (b) Kinetic energy.
12. What is the mathematical expression for the kinetic energy of an object of mass ‘m’ moving with velocity ‘v’?
(a) mv.
(b) mgh.
(c) 1/2 mv².
(d) F × s.
Ans: (c) 1/2 mv².
13. If the velocity of a vehicle doubles in magnitude, its kinetic energy becomes:
(a) 2 times the original value.
(b) Half the original value.
(c) Remains the same.
(d) 4 times the original value.
Ans: (d) 4 times the original value.
14. The energy stored by an object as a result of its deformation or due to its relative position is called:
(a) Kinetic energy.
(b) Potential energy.
(c) Thermal energy.
(d) Light energy.
Ans: (b) Potential energy.
15. When you stretch a rubber band or bend a bow, the work done is stored in the form of:
(a) Potential energy.
(b) Kinetic energy.
(c) Sound energy.
(d) Heat energy.
Ans: (a) Potential energy.
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