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Heat and Light
Heat and Light- 7th Std Science 3rd Term
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Question 1 |
100 degree on the Celsius scale is equal to 180 degree on the Fahrenheit scale. Then 1 degree Celsius is equal to
F-32 x 100/180 | |
F-32x 180/100 | |
F+ 32x 100/180 | |
F+ 32x 180/100 |
Question 2 |
On the Fahrenheit scale the number of divisions between upper and lower fixed position is
212 | |
180 | |
100 | |
32 |
Question 3 |
Ajay stands 1 m infront of a mirror. He moves 50 cm forward towards the mirror. The distance between Ajay and his image is
50 cm | |
2 m | |
3 m | |
1 m |
Question 4 |
To see your face in a mirror inside a dark room, you should shine light from a torch on to
The mirror | |
Your face | |
The nearest way | |
The ceiling of the room |
Question 5 |
Which of these will form both real and virtual images?
Plane mirror | |
Concave mirror | |
Convex mirror | |
All the above |
Question 6 |
The heat energy of sun is produced by
Combustion | |
Friction | |
Nuclear Friction | |
Nuclear Fusion |
Question 7 |
The unit used to measure heat energy is
Pascal | |
Joule | |
Celsius | |
Fahrenheit |
Question 8 |
A sensation of hotness or coldness is called as
Temperature | |
Boiling point | |
Melting point | |
Heat |
Question 9 |
The SI unit of temperature is
Joule | |
Celsius | |
Kelvin | |
Fahrenheit |
Question 10 |
The number of division in the Celsium Thermometer is
100 | |
180 | |
32 | |
212 |
Question 11 |
The number of division in Fahrenheit thermometer is
100 | |
180 | |
32 | |
212 |
Question 12 |
The bouncing back of light from a surface is
Refraction | |
Reflection | |
Deviation | |
Total internal reflection |
Question 13 |
Which of the following is a transparent object
Table | |
Chair | |
Glass | |
Wall |
Question 14 |
An image is produced by
Refraction of light | |
Reflection of light | |
Scattering of light | |
Total internal reflection |
Question 15 |
A plane mirror is _____ is shape
Bulged | |
Hollow | |
Flat | |
None |
Question 16 |
An image which cannot be caught over a screen is called
Real | |
Virtual | |
Inverted | |
Erect |
Question 17 |
A mirror with bulged reflecting surface is
Convex mirror | |
Concave mirror | |
Plane mirror | |
Transport mirror |
Question 18 |
A mirror with a hollow reflecting surface is called
Convex mirror | |
Concave mirror | |
Plane mirror | |
Transport mirror |
Question 19 |
Concave mirrors
Diverge light | |
Converge light | |
Scatter light | |
Absorb light |
Question 20 |
The mirror used as rear view mirrors in automobiles is
Concave | |
Convex | |
Plane | |
Transparent |
Question 21 |
The mirror used in solar cookers is
Concave | |
Convex | |
Plane | |
Transparent |
Question 22 |
The splitting up of white light into seven colour is called
Refraction | |
Reflection | |
Dispersion | |
Scatter |
Question 23 |
The image formed by convex mirrors are
Real | |
Virtual | |
Enlarged | |
Same size |
Question 24 |
A | |
B | |
C | |
D |
Question 25 |
A | |
B | |
C | |
D |
Question 26 |
A | |
B | |
C | |
D |
Question 27 |
A | |
B | |
C | |
D |
Question 28 |
A | |
B | |
C | |
D |
Question 29 |
A | |
B | |
C | |
D |
Question 30 |
A | |
B | |
C | |
D |
Question 31 |
A | |
B | |
C | |
D |
Question 32 |
A | |
B | |
C | |
D |
Question 33 |
- Fill in the blanks
Temperature | |
Celcius | |
Forenhi |
Question 34 |
The type of a moving vehicle becomes hot due to ______
Motion | |
Friction | |
Force |
Question 35 |
On a thermometric scale the boiling point of water is taken as the _______
Neutral | |
Lower fixed point | |
Upper fixed point |
Question 36 |
In a cinema, the image on the screen is a _____
Real image | |
mirror Image | |
3D |
Question 37 |
Bouncing back of light from a surface is called ____
Rear Image | |
Reflection |
Question 38 |
The sun gives out heat besides _______
air | |
Sound | |
light |
Question 39 |
_____ is the prime source of heat energy.
Sun | |
Light | |
air |
Question 40 |
The ancient man used ______ to produce a spark.
stone | |
Spark | |
Match box |
Question 41 |
Ancient man rubbed two _______ to make a fire.
flint stones | |
sand | |
Match Box |
Question 42 |
________ measures the degree of hotness or coldness of a body.
fahrenheit | |
celsius | |
Temperature |
Question 43 |
Liquids ______ on heating and ______ on cooling.
Expand, Contract | |
spread, broken |
Question 44 |
Kelvin Scale is also known as ______ scale of temperature
Moderate | |
Absolute |
Question 45 |
In a thermometer the lower fixed point is the _____ point of pure ice.
freeze | |
melting | |
Heating |
Question 46 |
In a thermometer the upper point is the _______ point of water.
Boiling | |
melting | |
Freezing |
Question 47 |
In some thermometers _________ is used.
Water | |
kerosene | |
alcohol |
Question 48 |
_________ is a form of energy that gives us sensation of vision.
Sound | |
Light | |
air |
Question 49 |
______ is a opaque object.
Table | |
Mirror | |
stone |
Question 50 |
__________ is a transparent material.
cement | |
Wood | |
Glass |
Question 51 |
The image formed by a plane mirror is _________ and ________
Virtual, Erect | |
rear, Exact |
Question 52 |
In a plane mirror the size of the image formed is always _________ to the size of the object.
unequal | |
equal | |
Moderate |
Question 53 |
Mirror have a thin layer of ______ at the back with the coating of red or orange pain.
Copper | |
silver | |
metal |
Question 54 |
In a plane mirror right appears as left and left appears as right. This property is known as ________
lateral inversion | |
Reflection | |
rear image |
Question 55 |
Convex and concave mirrors are referred to as _________
circle | |
cylindrical | |
spherical mirrors |
Question 56 |
The image formed on a paper or screen is called a ________
Reflection | |
Rear image | |
real image |
Question 57 |
______ mirrors form only virtual images that are diminished in size.
convex | |
Concave |
Question 58 |
________ mirror is used by Dentists and ENT Doctors to focus light on parts to be examined.
convex | |
concave |
Question 59 |
The band of colours formed due to dispersion is called as _______
spectrum | |
spectra | |
athena |
Question 60 |
To prove that white colour is formed due to combination of seven primary colour we use ___________ disc.
Robert Levenhooke | |
Newton’s |
Question 61 |
Match the following
- Sun a. Combustion
- Burning of paper b. Measures temperature
- Thermometer c. Dispersion of light
- Convex Mirror d. Source of heat and light
- Spectrum e. Diverges light
1 4 3 2 5 | |
2 3 5 1 4 | |
3 2 4 1 5 | |
1 4 5 2 3 |
Question 62 |
Match the following
- VIBGYOR a. Converges
- Convex mirror b. Virtual images
- Concave mirror c. Spectrum
- Always erect d. Used to watch over a large area
4 3 2 1 | |
3 4 1 2 | |
1 4 3 2 | |
2 3 1 4 |
Question 63 |
Match the following
- Fossil full a. Electronic device
- Kelvin b. Expands uniformly
- Digital thermometer c. SI unit of temperature
- Mercury d. Kerosene
4 3 1 2 | |
2 4 3 1 | |
3 4 2 1 | |
4 3 2 1 |
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There are 63 questions to complete.