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Science MCQ (1 Marks)

Light · Bihar Board (BSEB) STD 7 (BSEB - English Medium). 150 questions.

Questions · Page 3 of 3

MCQ (1 Marks)

MCQ 1011 Mark
How many colours comprises white light?
  • A
    Infinite
  • ✓
    Seven
  • C
    Three
  • D
    Fourteen
Answer
Correct option: B.
Seven
White light comprises of seven colours $-$ Violet, Indigo, Blue. Green, Yellow, Orange, Red.
So, when white light consisting of seven colors falls on a transparent medium $($glass prism$),$ each color in it is refracted $($or deviated$)$ by a different angle, with the result that seven colors are spread out to form a spectrum, The red color is deviated least, so it forms the upper part of the spectrum.
On the other hand, violet color is deviated the maximum, so violet appears at the bottom of the spectrum.
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MCQ 1021 Mark
An erect and enlarged image can be formed by:
  • A
    Only a convex mirror.
  • ✓
    Only a concave mirror.
  • C
    Only a plane mirror.
  • D
    Both convex and concave mirrors.
Answer
Correct option: B.
Only a concave mirror.
An erect and enlarged image can only be formed by a concave mirror and it is virtual in nature.
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MCQ 1031 Mark
$..........$ discovered that white light consists of seven colours.
  • A
    Walt Disney
  • B
    Frank Starling
  • C
    Laplace
  • ✓
    Sir Isaac Newton
Answer
Correct option: D.
Sir Isaac Newton
Sir Isaac Newton in $1666$ discovered that white light consists of seven colours.
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MCQ 1041 Mark
Image formed by a convex mirror is a:
  • A
    Virtual image.
  • B
    Erect.
  • C
    Diminished.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
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MCQ 1051 Mark
The coloured band of light obtained by dispersion of light is called:
  • A
    Image
  • ✓
    Spectrum
  • C
    Convergence
  • D
    Scattering
Answer
Correct option: B.
Spectrum
Dispersion is the phenomenon of splitting of polychromatic light into its constituent colours.
The band of colours obtained on the screen on passing white light through a prism is called a spectrum.
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MCQ 1061 Mark
An unlabeled analog clock is kept in front of mirror. Actual time on clock is $3.$ What is time in the mirror image$?$
  • A
    $3$
  • ✓
    $9$
  • C
    $6.15$
  • D
    $9.30$
Answer
Correct option: B.
$9$

 Due to lateral inversion, hour hand of image points to $9.$
Minute Hand keeps pointing to $12.$
Hence, time in mirror image is $3.$

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MCQ 1071 Mark
Reflection is the $..........$ of light off a surface.
  • ✓
    Bouncing
  • B
    Hitting
  • C
    Your Answer
  • D
    Firing
Answer
Correct option: A.
Bouncing
Reflection is the bouncing of light off a surface.
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MCQ 1081 Mark
The most common example of a curved mirror is a:
  • ✓
    Concave mirror
  • B
    Erect mirror
  • C
    Convex mirror
  • D
    Spherical mirror
Answer
Correct option: A.
Concave mirror
The most common example of a curved mirror is a spherical mirror.
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MCQ 1091 Mark
The mirror used as a shaving mirror is:
  • ✓
    Plane
  • B
    Convex
  • C
    Concave
  • D
    Spherical
Answer
Correct option: A.
Plane
The rotten dead matter in the soil is called sand.
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MCQ 1101 Mark
The mirror used in scooters, cars etc. to see the vehicles coming from the back is:
  • ✓
    Concave mirror
  • B
    Convex mirror
  • C
    Plane mirror
  • D
    Virtual mirror
Answer
Correct option: A.
Concave mirror
The mirror used as a shaving mirror is plane mirror.
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MCQ 1111 Mark
The light reflected by a plane mirror may form a real image $.........$
  • ✓
    If the rays incident on the mirror are converging.
  • B
    If the object is placed very close to the mirror.
  • C
    If the rays incident on the mirror are diverging.
  • D
    Under no circumstances.
Answer
Correct option: A.
If the rays incident on the mirror are converging.
The light reflected by a plane mirror may form a real image if the rays incident on the mirror are converging.
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MCQ 1121 Mark
If you touch your $.........$ ear with your right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with $.........$ hand.
  • A
    Right, left
  • ✓
    Left, left
  • C
    Right, right
  • D
    Left, right
Answer
Correct option: B.
Left, left
The plane mirror shows lateral inversion.
The left appears right and the right appears left.
So if you touch your left ear with your right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with your left hand.
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MCQ 1131 Mark
Light is a form of:
  • ✓
    Energy
  • B
    Power
  • C
    Heat
  • D
    Temperature
Answer
Correct option: A.
Energy
Light is a form of energy that travels as waves.
Their length or wavelength determines many of light's properties.
For instance, wavelength accounts for light's color and how it will interact with matter.
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MCQ 1141 Mark
Mark the statement which does not hold good for the image formed by a plane mirror:
  • A
    Image formed by a plane mirror is erect.
  • ✓
    Image formed by a plane mirror can be obtained on screen.
  • C
    Image distance from a plane mirror is equal to the distance of object from the mirror.
  • D
    All the above statements are true.
Answer
Correct option: B.
Image formed by a plane mirror can be obtained on screen.
Image formed by a plane mirror is virtual in nature. It can not be obtained on screen.
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MCQ 1151 Mark
When light is reflected from the a spherical or curved surface:
  • ✓
    The laws of reflections are followed.
  • B
    The laws of reflections are not followed.
  • C
    The laws of reflections may or may not be followed.
  • D
    One of the laws is followed, the other is not.
Answer
Correct option: A.
The laws of reflections are followed.
The laws of reflection hold good irrespective of shape of the reflecting surface.
So, the laws hold good for spherical or curved surfaces too.
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MCQ 1161 Mark
An image formed by a mirror or lens which is upright is:
  • ✓
    Virtual
  • B
    Concave
  • C
    Erect
  • D
    Convex
Answer
Correct option: A.
Virtual
An image formed by plane mirror or lens which is upright is erect.
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MCQ 1171 Mark
Which of the following forms a virtual and erect image for all positions of the object?
  • A
    Convex lens
  • ✓
    Plane mirror
  • C
    Convex mirror
  • D
    Concave mirror
Answer
Correct option: B.
Plane mirror
A plane mirror always forms a virtual and erect image for all positions of the object.
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MCQ 1181 Mark
An image being in such a position that top and bottom are reversed is:
  • ✓
    Erect
  • B
    Virtual
  • C
    Concave
  • D
    Inverted
Answer
Correct option: A.
Erect
An image being in such a position that top and bottom are reveresed is inverted.
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MCQ 1191 Mark
Which of the foilowing mirror is a car mirror made up of convex mirror that reflects the view out of the rear window?
  • ✓
    Concave mirror
  • B
    Rear $-$ view mirror
  • C
    Convex mirror
  • D
    None of these
Answer
Correct option: A.
Concave mirror
Rear view mirror is a car mirror made up of convex mirror.
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MCQ 1201 Mark
Convex lens converges the light generally falling on it and it is called:
  • ✓
    Diverging lens
  • B
    Concave lens
  • C
    Converging lens
  • D
    Coming lens
Answer
Correct option: A.
Diverging lens
Convex lens converges the light generally falling on it and is called converging lens.
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MCQ 1211 Mark
Looking through a lens at the sun or a bright light is:
  • A
    Easy
  • ✓
    Dangerous
  • C
    Difficult
  • D
    Good
Answer
Correct option: B.
Dangerous
A convex lens can focus the sunlight to a point to such an intensity that can burn paper, wood, plastic, etc.
This intense light can easily damage and distort our eye lens.
So, it is dangerous to look at the sun through a convex lens.
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MCQ 1221 Mark
Those lenses which feel thicker in the middle than that the edges are:
  • ✓
    Concave lens
  • B
    Real lens
  • C
    Convex lens
  • D
    Can’t say
Answer
Correct option: A.
Concave lens
Those lenses which feel thicker in the middle than the edges are convex lens.
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MCQ 1231 Mark
If we want to see our full image, then the minimum size of the plane mirror:
  • A
    Should be twice of our height.
  • B
    Should be of our height.
  • ✓
    Should be half of our height.
  • D
    Depends upon our distance from mirror.
Answer
Correct option: C.
Should be half of our height.
If we want to see our full image then the minimum size of the plane mirror should be half of our height.
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MCQ 1241 Mark
Newton’s disc is a disc with seven colours which appear on rotating.
  • ✓
    Black
  • B
    Green
  • C
    White
  • D
    Blue
Answer
Correct option: A.
Black
Newton’s disc is a disc with seven colours which appears white on rotating.
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MCQ 1251 Mark
The image of our face in a plane mirror is:
  • A
    Real
  • B
    Magnified
  • C
    Diminished
  • ✓
    Same as the size of the object
Answer
Correct option: D.
Same as the size of the object
The image formed by a plane mirror is a virtual, laterally inverted image at same distance from the mirror that of object and of same size of object.
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MCQ 1261 Mark
Light can pass through lenses as they are:
  • ✓
    Translucent
  • B
    Opaque
  • C
    Black
  • D
    Transparent
Answer
Correct option: A.
Translucent
Light can pass through lenses as they are transparent.
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MCQ 1271 Mark
Which mirror is used in movie projectors?
  • A
    Convex mirror
  • ✓
    Concave mirror
  • C
    Plane mirror
  • D
    Parabolic mirror
Answer
Correct option: B.
Concave mirror

Concave mirrors project a beam of light outward, which is what we want in a reflector or projector.
They used in things like $TV$ or movie projectors to make light rays spread out and produce enlarged images.

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MCQ 1281 Mark
An image which cannot be obtained on a screen is called:
  • ✓
    Erect image
  • B
    Concave image
  • C
    Virtual image
  • D
    Real image
Answer
Correct option: A.
Erect image
An image which cannot be obtained on a screen is called virtual image.
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MCQ 1291 Mark
Image of an object is seen in a plane mirror, the distance from the mirror to the image depends on:
  • A
    The wavelength of light.
  • ✓
    The distance of the object from the mirror.
  • C
    The distance of both the observer and the object to the mirror.
  • D
    The thickness of the mirror.
Answer
Correct option: B.
The distance of the object from the mirror.
Images in a plane mirror are formed as far behind the mirror as the object in front of it. Thus, the image distance depends only on the object's distance.
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MCQ 1301 Mark
The image formed behind a mirror and a virtual image:
  • ✓
    Are of same nature.
  • B
    Are of different nature.
  • C
    Are of same nature only in space.
  • D
    Are of different nature only in space.
Answer
Correct option: A.
Are of same nature.
The image formed behind a mirror is virtual in nature. So, they are of the same nature always.
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MCQ 1311 Mark
Comparing real and virtual images, we may say that:
  • A
    Real images can not be obtained on a screen and virtual images can be.
  • ✓
    Virtual images can not be obtained on a screen and real images can be.
  • C
    Both real and virtual images can be obtained on a screen.
  • D
    Neither real nor virtual images can be obtained on a screen.
Answer
Correct option: B.
Virtual images can not be obtained on a screen and real images can be.
Real images can be obtained on a screen. On $-$ screen rays meet in real. Virtual images can not be obtained on a screen. Because there is no meaning of screen for the virtual image.
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MCQ 1321 Mark
The term reflection refers to the bending of light rays:
  • ✓
    When they strike a mirror.
  • B
    When they enter a different medium.
  • C
    Around a sharp edge.
  • D
    Around the boundary of a narrow aperture.
Answer
Correct option: A.
When they strike a mirror.
In the reflection phenomena, Light rays travel through the same medium.
Hence, The term reflection refers to the bending of light rays when they strike a mirror.
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MCQ 1331 Mark
A virtual image formed by a plane mirror is $-$
  • A
    Diminished
  • B
    Inverted
  • ✓
    Erect
  • D
    Enlarged
Answer
Correct option: C.
Erect
A plane mirror always forms erect image and of same size as well.
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MCQ 1341 Mark
Why is it difficult to read image of a sentence from a book in a plane mirror?
  • ✓
    Due to lateral inversion.
  • B
    Due to scattering.
  • C
    Due to vertical inversion.
  • D
    Due to loss on reflection.
Answer
Correct option: A.
Due to lateral inversion.
On reflection from plane mirrors, Objects undergo lateral inversionMost of the alphabets are not symmetrical laterally and on reflection produce unrecognizable alphabets.
Also, letters on the right appear on the left.
This hurt the sequence of letters and makes words and sentences meaningless.
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MCQ 1351 Mark
If we want to see our full image, then the minimum size of the plane mirror:
  • A
    Should be twice of our height
  • B
    Should be of our height
  • ✓
    Should be half of our height
  • D
    Depends upon our distance from mirror
Answer
Correct option: C.
Should be half of our height
If we want to see our full image then the minimum size of the plane mirror should be half of our height.
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MCQ 1361 Mark
Which mirror is used in movie projectors?
  • A
    Convex mirror
  • ✓
    Concave mirror
  • C
    Plane mirror
  • D
    Parabolic mirror
Answer
Correct option: B.
Concave mirror

Concave mirrors project a beam of light outward, which is what we want in a reflector or projector.
They used in things like $TV$ or movie projectors to make light rays spread out and produce enlarged images.

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MCQ 1371 Mark
The image which can not be taken on the screen is called:
  • A
    A real image.
  • ✓
    A virtual image.
  • C
    Either a real or a virtual image.
  • D
    Neither a real nor a virtual image.
Answer
Correct option: B.
A virtual image.
The image which can not be taken on the screen is called a virtual image.
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MCQ 1381 Mark
In the case of plane mirror. from the mirror: distance of the image $=$ distance of the $........$
  • A
    Second image
  • ✓
    Object
  • C
    Both
  • D
    None
Answer
Correct option: B.
Object
The plane mirror is always for Virtual, erect and same size images and located at the same distance another side of the mirror.
ie Object distance and image distance from mirror is always same.
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MCQ 1391 Mark
The mirror used by doctor for examining eyes, ears, nose and throat is:
  • ✓
    Real
  • B
    Concave
  • C
    Virtual
  • D
    Donvex
Answer
Correct option: A.
Real
The mirror used by doctor for examining eyes, ears, nose and throat is concave.
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MCQ 1401 Mark
Which colour of light scattered least:
  • A
    Green
  • B
    Yellow
  • ✓
    Red
  • D
    Blue
Answer
Correct option: C.
Red
Rayleigh scattering states that the longer the wavelength of radiation, the less it is dispersed.
The higher the scattering, the shorter the wavelength of light; this is why blue or violet light scatters the most and red light scatters the least.
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MCQ 1411 Mark
The sunlight is said to be white light, a prism splits sunlight into:
  • ✓
    Seven colours.
  • B
    Seventeen colours.
  • C
    Seven hundred colours.
  • D
    Seventy colours.
Answer
Correct option: A.
Seven colours.
A sunlight is said to be white light, a prism splits sunlight into seven colours.
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MCQ 1421 Mark
Newton's colour disc was invented by whom?
  • A
    Albert Einstein
  • ✓
    Sir Isaac Newton
  • C
    Sir Isaac Newton and Faraday
  • D
    Sir Isaac Newton and John Kennedy
Answer
Correct option: B.
Sir Isaac Newton
Newton's colour disc was invented by Sir Issac Newton.
The disc is seven segments in rainbow colours and When the disc is rotated, the colours fade to white.
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MCQ 1431 Mark
A boy in front of mirror throws ball from right hand and catches with left hand. The direction of image of ball as seen from image of boy is:
  • A
    Right hand to Left Hand.
  • ✓
    Left hand to Right Hand.
  • C
    Right hand to Right Hand.
  • D
    Left Hand to Left Hand.
Answer
Correct option: B.
Left hand to Right Hand.
We know that plane mirrors form laterally inverted images, that is, due to lateral inversion of boy, left hand appears on right side in image and right hand appears on left side in image so as the boy in front of mirror throws ball from right hand and catches with left hand.
The direction of image of ball as seen from image of boy will be from left hand to right hand.
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MCQ 1441 Mark
Rectilinear propagation is:
  • A
    Mode of travelling in curved lines.
  • ✓
    Mode of travelling in straight lines.
  • C
    Ability to bend around obstacles.
  • D
    Displaying the phenomenon of diffraction.
Answer
Correct option: B.
Mode of travelling in straight lines.
This process of light travelling along a straight line without any interference in its path is called the rectilinear propagation of light.
Thus, we can say that rectilinear propagation is mode of travelling in straight lines.
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MCQ 1451 Mark
You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from:
  • A
    Both concave lens and convex lens.
  • B
    Both concave mirror and convex mirror.
  • ✓
    Both concave mirror and convex lens.
  • D
    Both convex mirror and concave lens
Answer
Correct option: C.
Both concave mirror and convex lens.
Oncave mirror and convex lens can only form real and inverted image of an object.
As convex mirror and concave lens always form a virtual and erect image of an object.
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MCQ 1461 Mark
If the reflecting surface of a spherical mirror is then it is called a concave mirror.
  • ✓
    Concave
  • B
    Erect
  • C
    Convex
  • D
    Virtual
Answer
Correct option: A.
Concave
If the reflecting surface of a spherical mirror is concave, then it is a concave mirror.
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MCQ 1471 Mark
When an object is placed between the Focus and centre of curvature of concave mirror, then:
  • A
    Real.
  • B
    Inverted.
  • C
    Enlarged.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
All of the above.
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MCQ 1481 Mark
Which one shows lateral inversion?
  • ✓
    Plane mirror
  • B
    Convex mirror
  • C
    Concave mirror
  • D
    All of these
Answer
Correct option: A.
Plane mirror
Plane Mirror shows lateral inversion.
The appearance of image in right hand side as left hand side and vice versa is known as lateral inversion.
The image formed by a plane mirror is always laterally inverted.
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MCQ 1491 Mark
What kind of image is obtained always for concave lens?
  • ✓
    Virtual, Erect and Diminished
  • B
    Real, Erect and Large
  • C
    Real, Erect and Diminished
  • D
    All of these
Answer
Correct option: A.
Virtual, Erect and Diminished
As can be seen in image, Virtual, Erect and Diminished image is obtained always for concave lens
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MCQ 1501 Mark
A virtual image:
  • A
    Can be formed on the screen.
  • ✓
    Cannot be formed on the screen.
  • C
    Is formed only by a plane mirror.
  • D
    Is formed only by the convex mirror.
Answer
Correct option: B.
Cannot be formed on the screen.
Cannot be formed on the screen.
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MCQ (1 Marks) - Page 3 - Science STD 7 Questions - Vidyadip