Class 9th Science Chapter – 10 Work, Power And Energy
| Textbook | NCERT |
| Class | 9th |
| Subject | Science |
| Chapter | 10th |
| Chapter Name | Work, Power And Energy |
| Category | Class 9th Science |
| Medium | English |
| Source | Last Doubt |
| Class 9th Science Chapter – 10 Work, Power And Energy MCQ with answer What is example of work power and energy? What is a formula of energy? What are the 3 formulas for power? What is the SI unit of energy?n What is the SI unit of power? What is the unit of power? Is joule a SI unit? Is newton an SI unit? What is the measure of energy? What is heat unit? What is the units of joule? What are the 2 main forms of energy? How many types of energy is? What is energy made of? What are the basics of energy? |
Class 9th Science Chapter – 10 Gravitation
Chapter – 10
Work, Power And Energy
MCQ
| (1) Identify from the following which is true about work? A. Unit of work is newton metre B. Its SI unit is Joule. C. It is a scalar quantity D. All of these Answer – (A) Unit of work is newton metre |
| (2) The energy of a body due to its motion is called ____? A. gravitation energy B. static energy C. kinetic energy D. All of these Answer – (C) kinetic energy |
| (2) The energy of a body due to its motion is called ____? A. gravitation energy B. static energy C. kinetic energy D. All of these Answer – (C) kinetic energy |
| (3) Which is the renewable source of energy among the following? A. Sun B. Coal C. Natural gas D. Fossil fuels Answer – (A) Sun |
| (4) What is the work done on a satellite by the Earth’s gravitational force? A. Zero, because the force exerted by the Earth on the satellite is parallel to the displacement of the satellite. B. Zero, because the force exerted by the Earth on the satellite is perpendicular to the displacement of the satellite. C. Positive, because the force exerted by the Earth on the satellite is perpendicular to the displacement of the satellite. D. Negative, because the force exerted by the Earth on the satellite is perpendicular to the displacement of the satellite. Answer – (B) Zero, because the force exerted by the Earth on the satellite is perpendicular to the displacement of the satellite. |
| (5) The momentum of a body is _________? A. directly proportional to velocity of the body, provided its mass remains constant. B. directly proportional to the mass of the body, provided its velocity remains constant. C. inversely proportional to the kinetic energy of the body D. Both (A) and (B) Answer – (D) Both (A) and (B) |
| (6) If 20 N of force is applied on a body and the body is displaced by 2 m, then work done on the body is? A. 5 J B. 40 J C. 10 N D. 40 N Answer – (B) 40 J |
| (7) The commercial unit of energy is________? A. Watt B. Kilowatt C. Watt-hour D. Kilowatt-hour Answer – (D) Kilowatt-hour |
| (8) _______ is the process in which two or more atomic nuclei join to form a single heavier nucleus? A. Nuclear fission B. Nuclear fusion C. Any nuclear D. None of these Answer – (B) Nuclear fusion |
| (9) Which of the following is NOT a stored form of energy? A. Chemical energy B. Gravitational potential energy C. Kinetic energy D. Elastic potential energy Answer – (C) Kinetic energy |
| (10) If the force applied on a body displaces it in the opposite direction, then the work done on the body by the applied force is _______? (a) Is negative. (b) Is positive. (c) Is zero. (d) Can be positive or zero. Answer – (A) Is negative. |
| (11) Power is defined as ____? A.work done per unit time B. mass per unit volume C. energy consumed per unit time D. Both (A) and (A) Answer – (D) Both (A) and (C) |
| (12) The ratio of change in the kinetic energy of a body to the time taken by the body for the change in energy is equal to the? A. Pressure applied by the body. B. Work done on the body. C. Energy stored in the body. D. Power expended by the body Answer – (D) Power expended by the body |
| (13) A player transfers a momentum of 12 kg m/s to a ball of mass 400 g which is at rest. Find the work done on the ball? A.180 J B. 345 J C. 400 J D. 427 J Answer – (A) 180 J |
| (14) A body at rest at a certain height possesses which energy? A. Kinetic B. Gravitational potential C. Elastic potential D. Heat Answer – (B) Gravitational potential |
| (15) Person A reached the 2nd floor of a hospital by lift and person B reached the same floor by stairs. If both their masses are the same, then the ______? A. Work done on A against the gravitational force is greater than that done on B B. Work done on B against the gravitational force is greater than that done on A C. Work done on them against the gravitational force is the same D. Power expended by both of them is the same Answer – (C) Work done on them against the gravitational force is the same |
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