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Heat and Light

Winmeen WinmeenAugust 9, 2018
0 1,156 Less than a minute

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
A
F-32 x 100/180
B
F-32x 180/100
C
F+ 32x 100/180
D
F+ 32x 180/100
Question 2
On the Fahrenheit scale the number of divisions between upper and lower fixed position is
A
212
B
180
C
100
D
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
A
50 cm
B
2 m
C
3 m
D
1 m
Question 4
To see your face in a mirror inside a dark room, you should shine light from a torch on to
A
The mirror
B
Your face
C
The nearest way
D
The ceiling of the room
Question 5
Which of these will form both real and virtual images?
A
Plane mirror
B
Concave mirror
C
Convex mirror
D
All the above
Question 6
The heat energy of sun is produced by
A
Combustion
B
Friction
C
Nuclear Friction
D
Nuclear Fusion
Question 7
The unit used to measure heat energy is
A
Pascal
B
Joule
C
Celsius
D
Fahrenheit
Question 8
A sensation of hotness or coldness is called as
A
Temperature
B
Boiling point
C
Melting point
D
Heat
Question 9
The SI unit of temperature is
A
Joule
B
Celsius
C
Kelvin
D
Fahrenheit
Question 10
The number of division in the Celsium Thermometer is
A
100
B
180
C
32
D
212
Question 11
The number of division in Fahrenheit thermometer is
A
100
B
180
C
32
D
212
Question 12
The bouncing back of light from a surface is
A
Refraction
B
Reflection
C
Deviation
D
Total internal reflection
Question 13
Which of the following is a transparent object
A
Table
B
Chair
C
Glass
D
Wall
Question 14
An image is produced by
A
Refraction of light
B
Reflection of light
C
Scattering of light
D
Total internal reflection
Question 15
A plane mirror is _____ is shape
A
Bulged
B
Hollow
C
Flat
D
None
Question 16
An image which cannot be caught over a screen is called
A
Real
B
Virtual
C
Inverted
D
Erect
Question 17
A mirror with bulged reflecting surface is
A
Convex mirror
B
Concave mirror
C
Plane mirror
D
Transport mirror
Question 18
A mirror with a hollow reflecting surface is called
A
Convex mirror
B
Concave mirror
C
Plane mirror
D
Transport mirror
Question 19
Concave mirrors
A
Diverge light
B
Converge light
C
Scatter light
D
Absorb light
Question 20
The mirror used as rear view mirrors in automobiles is
A
Concave
B
Convex
C
Plane
D
Transparent
Question 21
The mirror used in solar cookers is
A
Concave
B
Convex
C
Plane
D
Transparent
Question 22
The splitting up of white light into seven colour is called
A
Refraction
B
Reflection
C
Dispersion
D
Scatter
Question 23
The image formed by convex mirrors are
A
Real
B
Virtual
C
Enlarged
D
Same size
Question 24
A
A
B
B
C
C
D
D
Question 25
A
A
B
B
C
C
D
D
Question 26
A
A
B
B
C
C
D
D
Question 27
A
A
B
B
C
C
D
D
Question 28
A
A
B
B
C
C
D
D
Question 29
A
A
B
B
C
C
D
D
Question 30
A
A
B
B
C
C
D
D
Question 31
A
A
B
B
C
C
D
D
Question 32
A
A
B
B
C
C
D
D
Question 33
  • Fill in the blanks
  _____ is a measure of heat energy possessed by a body.
A
Temperature
B
Celcius
C
Forenhi
Question 34
The type of a moving vehicle becomes hot due to ______
A
Motion
B
Friction
C
Force
Question 35
On a thermometric scale the boiling point of water is taken as the _______
A
Neutral
B
Lower fixed point
C
Upper fixed point
Question 36
In a cinema, the image on the screen is a _____
A
Real image
B
mirror Image
C
3D
Question 37
Bouncing back of light from a surface  is called ____
A
Rear Image
B
Reflection
Question 38
The sun gives out heat besides _______
A
air
B
Sound
C
light
Question 39
_____ is the prime source of heat energy.
A
Sun
B
Light
C
air
Question 40
The ancient man used ______ to produce a spark.
A
stone
B
Spark
C
Match box
Question 41
Ancient man rubbed two _______ to make a fire.
A
flint stones
B
sand
C
Match Box
Question 42
________ measures the degree of hotness or coldness of a body.
A
fahrenheit
B
celsius
C
Temperature
Question 43
Liquids ______ on heating and ______ on cooling.
A
Expand, Contract
B
spread, broken
Question 44
Kelvin Scale is also known as ______ scale of temperature
A
Moderate
B
Absolute
Question 45
In a thermometer the lower fixed point is the _____ point of pure ice.
A
freeze
B
melting
C
Heating
Question 46
In a thermometer the upper point is the _______ point of water.
A
Boiling
B
melting
C
Freezing
Question 47
In some thermometers _________ is used.
A
Water
B
kerosene
C
alcohol
Question 48
_________ is a form of energy that gives us sensation of vision.
A
Sound
B
Light
C
air
Question 49
______ is a opaque object.
A
Table
B
Mirror
C
stone
Question 50
__________ is a transparent material.
A
cement
B
Wood
C
Glass
Question 51
The image formed by a plane mirror is _________ and ________
A
Virtual, Erect
B
rear, Exact
Question 52
In a plane mirror the size of the image formed is always _________ to the size of the object.
A
unequal
B
equal
C
Moderate
Question 53
Mirror have a thin layer of ______ at the back with the coating of red or orange pain.
A
Copper
B
silver
C
metal
Question 54
In a plane mirror right appears as left and left appears as right. This property is known as ________
A
lateral inversion
B
Reflection
C
rear image
Question 55
Convex and concave mirrors are referred to as _________
A
circle
B
cylindrical
C
spherical mirrors
Question 56
The image formed on a paper or screen is called a ________
A
Reflection
B
Rear image
C
real image
Question 57
______ mirrors form only virtual images that are diminished in size.
A
convex
B
Concave
Question 58
________ mirror is used by Dentists and ENT Doctors to focus light on parts to be examined.
A
convex
B
concave
Question 59
The band of colours formed due to dispersion is called as _______
A
spectrum
B
spectra
C
athena
Question 60
To prove that white colour is formed due to combination of seven primary colour we use ___________ disc.
A
Robert Levenhooke
B
Newton’s
Question 61
Match the following
  1. Sun                                  a. Combustion
  2. Burning of paper           b. Measures temperature
  3. Thermometer                 c. Dispersion of light
  4. Convex Mirror               d. Source of heat and light
  5. Spectrum                       e. Diverges light
A
1 4 3 2 5
B
2 3 5 1 4
C
3 2 4 1 5
D
1 4 5 2 3
Question 62
Match the following
  1. VIBGYOR                   a. Converges
  2. Convex mirror         b. Virtual images
  3. Concave mirror          c. Spectrum
  4. Always erect               d. Used to watch over a large area
A
4 3 2 1
B
3 4 1 2
C
1 4 3 2
D
2 3 1 4
Question 63
Match the following
  1. Fossil full                 a. Electronic device
  2. Kelvin                            b. Expands uniformly
  3. Digital thermometer     c. SI unit of temperature
  4. Mercury                           d. Kerosene
A
4 3 1 2
B
2 4 3 1
C
3 4 2 1
D
4 3 2 1
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Winmeen WinmeenAugust 9, 2018
0 1,156 Less than a minute
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