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Physics For Class IX (Science Group)
UNIT 8 ENERGY SOURCES AND TRANSFER OF ENERGY
Multiple Choice Questions (MCQs) , Fill in the blanks and Concept Map
Section (A) Multiple Choice Questions (MCQs)
Tick mark (✓) the correct answer:1. If force of 6 N displaces an object 2 m in the direction of force, then work done will be:
(a) 0
(b) 12 Joule ✓
(c) 3 Joule
(d) Both b and c
2. If a body of mass 1 kg is moving with velocity of 1 m/sec. then K.E of the body will be:
(a) Joules
(b) Joules
(c) Joule
(d) 1 Joule
(Note: Here numerical values are missing in the textbook. Answer will be 1/2 joule ✓)
3. If a machine performs 20 J of work in 10 sec. then it power is:
(a) 200 watt
(b) 20 watt
(c) 2 watt ✓
(d) 0.2 watt
4. A body of mass 1 kg is lifted through a height of l m. The energy possessed in the body will be: (consider g = 10 ms-2).
(a) 1 J
(b) 10 Joule ✓
(c) 100 Joule
(d) 1000 Joule
5. The energy released during fission or fusion reaction is called:
(a) Solar energy
(b) Geothermal energy
(c) Tidal energy
(d) Nuclear energy ✓
6. Which is the renewable source of energy?
(a) Solar and wind ✓
(b) Coal
(c) Natural gas
(d) Petroleum
7. The ratio of output to input is called:
(a) Energy
(b) Work
(c) Power
(d) Efficiency ✓
8. Work done per unit time is called:
(a) Efficiency
(b) Energy
(c) Power ✓
(d) Force
9. Coal, gas and oil are all examples of:
(a) Tidal energy
(b) Nuclear energy
(c) Fossil fuel energy ✓
(d) Biomass energy
10. ______ is not a renewable source of energy.
(a) Solar energy
(b) Coal ✓
(c) Wind energy
(d) Geothermal energy
11. When a force makes something move, in Physics, it is called:
(a) work ✓
(b) power
(c) kinetic energy
(d) efficiency
12. The S.I. unit of work is:
(a) foot
(b) pound
(c) erg
(d) joule ✓
13. 1 joule = ____.
(a) 1 Nm-1
(b) 10 Nm-1
(c) 1 Nm ✓
(d) 10 Nm
14. The ability to do work is defined as:
(a) power
(b) energy ✓
(c) efficiency
(d) potential energy
15. The S.l. unit of energy is:
(a) joule ✓
(b) watt
(c) foot-pound
(d) erg
16. Mathematically, kinetic energy is represented by:
(a) mv2
(b) ½ mv2 ✓
(c) mgh
(d) ½ mgh
17. The energy that a body possesses by virtue of its position, shape or state of a system is known as:
(a) kinetic energy
(b) potential energy ✓
(c) gravitational energy
(d) geothermal energy
18. Mathematically potential energy is given as:
(a) mv2
(b) ½ mv2
(c) mgh ✓
(d) ½ mgh
19. Water stored in a dam is an example of:
(a) kinetic energy
(b) potential energy ✓
(c) chemical energy
(d) geothermal energy
20. Fossil fuels have stored:
(a) potential energy
(b) geothermal energy
(c) solar energy
(d) chemical energy ✓
21. This kind of energy is stored in the Earth as its natural heat.
(a) Geothermal energy ✓
(b) Chemical energy
(c) Nuclear energy
(d) Potential energy
22. Wood, organic material, garbage and sugarcane are sources of:
(a) geothermal energy
(b) chemical energy
(c) biomass energy ✓
(d) solar energy
23. Which one of the following has no unit?
(a) Power
(b) Work done
(c) Energy
(d) Efficiency ✓
24. Efficiency is:
(a) (output / input) x 100 ✓
(b) (input / output) x 100
(c) (input/ 100) x output
(d) input x output
25. The rate of doing work is known as:
(a) energy
(b) efficiency
(c) power ✓
(d) kinetic energy
26. The amount of energy transferred per unit time is called as:
(a) energy
(b) efficiency
(c) power ✓
(d) kinetic energy
27. Power is a:
(a) scalar quantity ✓
(b) vector quantity
(c) Both 'a' &'b'
(d) None of these
28. Unit of power is:
(a) joule
(b) watt ✓
(c) Nm
(d) erg
29. Joule /sec = ______:
(a) Nm
(b) watt ✓
(c) erg
(d) pound
30. 1 hp = _______.
(a) 103 watt
(b) 106 watt
(c) 100 watt
(d) 746 watt ✓
FILL IN THE BLANKS:
- Work is the product of force and the distance.
- W = F . S or F x S
- The ability to do work is called energy.
- SI unit of energy is Joule (J).
- Energy possessed by an object due to its motion is called as Kinetic Energy.
- K∙E = 1/2 mv2
- Energy due to position of an object is called Potential Energy
- P∙E = mgh.
- Energy exists in many different forms such as nuclear energy, heat energy, electrical energy, chemical energy, light energy, etc.
- Solar energy, wind energy, tidal energy, geothermal energy, biomass energy and hydroelectric energy are the examples of renewable sources of energy.
- Wood, coal, petroleum, natural gas and Uranium are examples of nonrenewable sources of energy.
- The ratio of output to the input is called efficiency.
- The work done in unit time is called power.
- SI unit of work is Watt.
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