Energy Sources and Transfer of Energy - Physics For Class IX (Science Group) - Multiple Choice Questions (MCQs) , Fill in the blanks and Concept Map

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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:

1. Work is the product of force and the distance. 
2. W = F . S or F x S
3. The ability to do work is called energy.
4. SI unit of energy is Joule (J).
5. Energy possessed by an object due to its motion is called as Kinetic Energy. 
6. K∙E =  ¹/₂ mv²
7. Energy due to position of an object is called Potential Energy 
8. P∙E = mgh.
9. Energy exists in many different forms such as nuclear energy, heat energy, electrical energy, chemical energy, light energy, etc.
10. Solar energy, wind energy, tidal energy, geothermal energy, biomass energy and hydroelectric energy are the examples of renewable sources of energy.
11. Wood, coal, petroleum, natural gas and Uranium are examples of nonrenewable sources of energy.
12. The ratio of output to the input is called efficiency.
13. The work done in unit time is called power.
14. SI unit of work is Watt.

CONCEPT MAP