Chapter No. 5 Test No. 1
1. The ability to do work is called ________.
ⓐ Matter ⓑ Energy ⓒ Density ⓓ Work
Energy
2. The biggest source of energy is the______.
ⓐ Moon ⓑ Stars ⓒ Sun ⓓ None of these
Sun
3. Water (flowing), air, coal, oil, gas and wood are the sources of______.
ⓐ energy ⓑ Sun ⓒ Gas ⓓ None of these
Energy
4. _______ can be transformed into another form.
ⓐ Energy ⓑ Water ⓒ Both a & b ⓓ None of these
Energy
5. Electricity produced from the fast-flowing water is called as_______.
ⓐ Hydroelectricity ⓑ Solar ⓒ Mechanic ⓓ None of these
Hydroelectricity
6. How hydroelectricity is made?
ⓐ Dam is built and water of river is stored in a lake at certain height. ⓑ The store water flows very fast through a tunnel and runs a turbine. ⓒ The turbine runs a generator which produces electricity. ⓓ All of these
All of these
7. In thermal power station, _______ is/are used to produce electricity.
ⓐ Coal ⓑ Oil ⓒ Gas ⓓ All of these
All of these
8. How electricity is produced in thermal power station.
ⓐ Burn coal, oil or gas to change water into steam. ⓑ The steam is used to run a turbine. ⓒ The turbine runs a generator to produce electricity. ⓓ All of these
All of these
9. There are _______ reserve of sources of energy like coal, oil and gas.
ⓐ Limited ⓑ Unlimited ⓒ Vide range ⓓ None of these
Limited
10. Coal, oil and gas are made in _______ of years.
ⓐ 10 ⓑ Hundreds ⓒ Thousands ⓓ millions
millions
11. In windmill, electricity is produced from the energy of_______.
ⓐ Sun ⓑ Water ⓒ Coal ⓓ fast wind
fast wind
12. _______is a form of energy that helps us to see things around us.
ⓐ Light ⓑ Coal ⓒ Mobile cell ⓓ None of these
Light
13. The sun, stars and lighting are the _______sources of light.
ⓐ Artificial ⓑ Natural ⓒ Thermal ⓓ Hydro
Natural
14. Candle, oil lamp, torch, electric bulb are the ________sources of light.
ⓐ Artificial ⓑ Natural ⓒ Thermal ⓓ Hydro
Artificial
15. _______ travels in all directions in straight lines.
ⓐ Light ⓑ Coal ⓒ Mobile cell ⓓ None of these
Light
16. When light cannot pass through an object, a _________of that object is formed behind it.
ⓐ Image ⓑ Imaginary image ⓒ Shadow ⓓ None of these
Shadow
17. Light always travels in _________ path.
ⓐ Zig zag ⓑ Waves ⓒ Straight ⓓ no path
Straight
18. When light strikes the shiny and smooth surface of mirror, it bounces back and enters our eye; this is called ___________of light.
ⓐ Refraction ⓑ Reflection ⓒ Diffraction ⓓ Diverging
Reflection
19. Due to _________ of light, we can see our image in mirror.
ⓐ Refraction ⓑ Reflection ⓒ Diffraction ⓓ Diverging
Reflection
20. There are _________colors in sunlight.
ⓐ Five ⓑ Six ⓒ Seven ⓓ One
Seven
21. the colors present in sunlight are:
ⓐ Red, orange, yellow ⓑ Green, blue ⓒ Indigo, violet ⓓ All of these
All of these
22. After rain when sunlight pass through water droplets suspended in the air, they divide it into seven colors which is called________.
ⓐ Prism ⓑ Rainbow ⓒ Both a & b ⓓ None of these
Rainbow
23. ________ is the form of energy that is produced by vibrations in an object.
ⓐ Prism ⓑ Rainbow ⓒ Sound ⓓ Producer
Sound
24. The vibrating object produces ________.
ⓐ Prism ⓑ Rainbow ⓒ Sound ⓓ Producer
Sound
Chapter No. 5 Test No. 2
25. Sound needs some _________ to travel.
ⓐ Vacuum ⓑ Light ⓒ Medium ⓓ None of these
Medium
26. The sound reaches our ears through particles of the _______
ⓐ Vacuum ⓑ Light ⓒ Air ⓓ None of these
Air
27. The _________ present in our throat produce sound.
ⓐ vocal cards ⓑ Mic system ⓒ No cards ⓓ Simple cards
vocal cards
28. Sound cannot travel in________.
ⓐ Vacuum ⓑ Iron ⓒ Medium ⓓ None of these
Vacuum
29. When sound bounces back from an object (reflects) at a certain distance and we hear it again, it is called ____.
ⓐ Real sound ⓑ No sound ⓒ Echo ⓓ None of these
Echo
30. _________ use echo to catch its prey in darkness.
ⓐ Rat ⓑ Cat ⓒ Bat ⓓ None of these
Bat
31. A hard and smooth object ________ sound better.
ⓐ Refracts ⓑ Reflects ⓒ Both a & b ⓓ None of these
Reflects
32. To hear a clear echo, the reflecting surface should be at least _______meters away from the source of sound.
ⓐ 7 ⓑ 17 ⓒ 27 ⓓ 37
17
33. Heat is a form of ________.
ⓐ Matter ⓑ Energy ⓒ Coal ⓓ Oil
Energy
34. Heat always travels from _________ object.
ⓐ Cold to hot ⓑ Hot to cold ⓒ Hot to hot ⓓ Cold to cold
Hot to cold
35. _______ is used to measure the hotness or coldness of an object.
ⓐ Temperature ⓑ Energy ⓒ Thermometer ⓓ None of these
Thermometer
36. The instrument used to measure temperature is called ______.
ⓐ Temperature ⓑ Energy ⓒ Thermometer ⓓ None of these
Thermometer
37. In thermometer, ______ present in its bulb.
ⓐ Mercury ⓑ Alcohol ⓒ Both a & b ⓓ None of these
Both a & b
38. When the bulb of thermometer touches a hot object, the mercury or alcohol _______________
ⓐ Expands ⓑ Contracts ⓒ Both at same time ⓓ None of these
Expands
39. When the bulb of thermometer touches a cold object, the mercury or alcohol _______
ⓐ Expands ⓑ Contracts ⓒ Both at same time ⓓ None of these
Contracts
40 Doctors usually measure temperature in _______ scale.
ⓐ Centigrade ⓑ Fahrenheit ⓒ Kelvin ⓓ None of these
Fahrenheit
41. The symbol of Fahrenheit scale is _______
ⓐ 0F ⓑ oC ⓒ oFa ⓓ oCd
0F
42. The symbol of degree centigrade is _______
ⓐ 0F ⓑ oC ⓒ oFa ⓓ oCd
0C
43. To describe the condition of weather, _______ is used.
ⓐ 0F ⓑ oC ⓒ oFa ⓓ oCd
0F
44. When the object is hot, its temperature _______
ⓐ Increases ⓑ Decreases ⓒ Both at the same time ⓓ None of these
Increases
45. When the object is cold, its temperature _______
ⓐ Increases ⓑ Decreases ⓒ Both at the same time ⓓ None of these
Decreases
46. Fahrenheit and degree centigrade are the units of _______.
ⓐ Hotness ⓑ Coldness ⓒ Temperature ⓓ None of these
Temperature
Chapter No. 5 Test No. 3
47. Electricity or electric energy is produced by _______
ⓐ Water ⓑ Air ⓒ Generators ⓓ None of these
Generators
48. The electricity supplied to our homes through _______
ⓐ Wi Fi Signals ⓑ Mechanical energy ⓒ Wires ⓓ Signals
Wires
49. Cells and batteries are the sources of________ energy.
ⓐ Sound ⓑ Heat ⓒ Electrical ⓓ None of these
Electrical
50. In toys, torch, clock etc _______ is used.
ⓐ Cells ⓑ Batteries ⓒ Both a & b ⓓ None of these
Both a & b
51. For running devices in our homes _______ energy is used.
ⓐ Sound ⓑ Heat ⓒ Electrical ⓓ None of these
Electrical
52. Electrical energy can be transformed into other forms of energy like:
ⓐ Heat ⓑ Light ⓒ Sound ⓓ All of these
All of these
53. In heater, the electrical energy changes into _______
ⓐ Sound ⓑ Heat ⓒ light ⓓ None of these
Heat
54. In electric bulb, the electrical energy changes into _______
ⓐ Sound ⓑ Heat ⓒ Light ⓓ None of these
Light
55. In loud speaker, the electrical energy changes into _______
ⓐ Sound ⓑ Heat ⓒ Electrical ⓓ None of these
Sound
56. The path of current is called a/an electric ________.
ⓐ Power ⓑ Energy ⓒ Heater ⓓ circuit
circuit
57. When the switch is turned “ON” the path of electric current is _______
ⓐ Open ⓑ Complete ⓒ Infinite ⓓ None of these
Complete
58. When the path of electric current is complete, the bulb is _______
ⓐ ON ⓑ OFF ⓒ Both a & b ⓓ None of these
ON
59. The system of life is working due to _______ of one form of energy into another.
ⓐ Creation ⓑ Destroyed ⓒ Transformations ⓓ None of these
Transformations
60 _______ helps us to see things.
ⓐ Moon ⓑ Light ⓒ Sound ⓓ None of these
Light
61. Sound is produced by _______ objects.
ⓐ Vacuum ⓑ Vibrating ⓒ Electrical ⓓ None of these
Vibrating
62. The temperature of hot objects is _______ than the temperature of cold objects.
ⓐ Smaller ⓑ Greater ⓒ Lower ⓓ None of these
Greater
63. Which of the following is a not a form of energy?
ⓐ Light ⓑ Sound ⓒ Water ⓓ Heat
Water
64. We hear echo when sound:
ⓐ Reaches us direct from the source ⓑ comes after bouncing back from a wall at a certain distance. ⓒ Comes from a loud speaker ⓓ Is very loud
comes after bouncing back from a wall at a certain distance.
65. How many colors are present in sunlight?
ⓐ 1 ⓑ 3 ⓒ 5 ⓓ 7
7
66. If you take your hand nearer to the lighted lamp than to the wall, the shadow of your hand:
ⓐ Will not form. ⓑ will be smaller. ⓒ Will be bigger ⓓ Will be the same size
will be smaller.
67. Electrical energy can be transformed into:
ⓐ Heat ⓑ Light ⓒ Sound ⓓ All of these
All of these