1 light year = ...? Mcqs

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1 light year = ...?

(A) 9.5×106 km
(B) 9.5×109 km

(C) 9.5×1012 km
(D) 9.5×1018 km

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In what year did Galileo first use an optical telescope to study the moon...?

(A) 1492
(B) 1609

(C) 1212
(D) 1743

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An active asteroid is discovered near ________ Orbit for the first time in billion years....?

(A) Saturn
(B) Mars

(C) Neptune
(D) Jupiter

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Clocks, which moves with the velocities comparable with the velocity of light, run ...?

(A) fast
(B) slow

(C) equal to the velocity of light
(D) with zero velocity

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The sunlight can reach a depth of___________meters in the ocean...?

(A) 80
(B) 200

(C) 120
(D) None

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A narrow beam of white light passes from air into the glass and is refracted. The wave characteristic remains unchanged in its ______...?

(A) Direction
(B) Speed

(C) Frequency
(D) Wavelength

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Only planet whose day is longer than its year is__________...?

(A) Mercury
(B) Neptune

(C) Venus
(D) None of These

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Moon light reaches to earth in___________seconds...?

(A) 0.3 seconds
(B) 1.3 seconds

(C) 2.3 seconds
(D) 3.3 seconds

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Sun revolves around milky way in about _____ million years....?

(A) 225
(B) 230

(C) 245
(D) 250

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Light travelling in a straight line ______ when it strikes the surface of another medium....?

(A) Reflects
(B) Refracts

(C) Diffracts
(D) Absorbs

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Light Emitting Diode (LED) is a ___ semiconductor device ....?

(A) 3 lead
(B) 4 lead

(C) 7 lead
(D) 2 lead

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The Time taken for sunlight to reach the Earth is___________...?

(A) 700 sec
(B) 8hrs 20 mins

(C) 8 mins 20 sec
(D) 8 mins

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Exposure to sunlight helps a person improve his health because ________...?

(A) Resistance power increases
(B) The infrared light kills bacteria in the body

(C) The ultraviolet rays convert skin oil into Vitamin D
(D) The pigment cells in the skin get stimulated and produce a healthy tan

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When light changes in direction when entering one transparent medium to another is known as...?

(A) Reflection
(B) Diffraction

(C) Refraction
(D) Absorption

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When a parallel beam of light rays strikes a smooth surface like mirrors, it will be reflected as parallel rays of light is called...?

(A) Irregular Reflection
(B) Specular Reflection

(C) Diffused Reflection
(D) Scattered Reflection

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When light passes through prism _____ occurs to form spectrum....?

(A) Refraction
(B) Reflection

(C) Diffraction
(D) None

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Which of the following occurs when light passes through a substance unchanged...?

(A) Transmission
(B) Reflection

(C) Absorption
(D) Refraction

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Air, water, sun, land, rocks and light etc is/are an examples of...?

(A) Non-Living Components
(B) Abiotic Factors

(C) Biotic Factors
(D) Both A and B

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The point through which a ray of light passes without changing its path is the _____...?

(A) Focal Point
(B) Principal Axis

(C) Optical Centre
(D) Centre of Curvature

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Light dependent reaction takes place in ______...?

(A) Stroma
(B) Thylakoid

(C) Cristae
(D) Cisternae

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The entire light is reflected into the same denser medium, which is called total...?

(A) External reflection
(B) External refraction

(C) Internal reflection
(D) Internal refraction

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Which of the following phenomena of light are involved in the formation of a rainbow...?

(A) Refraction
(B) Dispersion

(C) Total internal reflection
(D) All of the above

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A process in which light rays falls on any material object and these rays bounce back is known as...?

(A) Reflection
(B) Refraction

(C) Diffusion
(D) Absorption

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The lens which coverage a beam of parallel rays of light are called ____...?

(A) Diverging lens
(B) Converging lens

(C) Cylindrical lens
(D) None

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A light year is a unit of ...?

(A) Time
(B) Energy

(C) distance
(D) Mass

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Splitting of water in presence of light called...?

(A) Hydrolysis
(B) Glycolysis

(C) Photolysis
(D) None of these

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When a light ray enters from a denser medium to a rare medium, it bends ______...?

(A) Perpendicular to normal
(B) Parallel to normal

(C) Toward normal
(D) Away from normal

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The day and night are formed due to 'Earth' rotation on its own axis from...?

(A) North to South
(B) South to North

(C) East to West
(D) West to East

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According to Big Bang Theory, the Universe began about __________ billion years ago....?

(A) 10 – 20
(B) 20 – 30

(C) 30 – 40
(D) 40 – 50

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The phenomenon of dispersion light can be observed experimentally by passing a white light through ____...?

(A) Lens
(B) Prism

(C) Mirror
(D) Grating

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Light travels in a ______...?

(A) Curved Path
(B) Zigzag Pattern

(C) Straight Line
(D) Circular Motion

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An optic piece of curved transparent glass or plastic that refract the light in a specific way is called...?

(A) Prism
(B) Filter

(C) Lens
(D) Mirror

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If the green leaves are placed under red light, their color will become________...?

(A) Green
(B) Black

(C) Red
(D) Blue

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The light rays used for eliminating bacteria...?

(A) X-rays
(B) infrared rays

(C) microwave radiation
(D) ultra-violet radiation

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When parallel rays of light fall onto rough surface they are reflected in different directions and are scattered is called _____...?

(A) Regular Reflection
(B) Specular Reflection

(C) Diffused Reflection
(D) None

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In a photocell light energy is converted into...?

(A) potential energy
(B) chemical energy

(C) heat energy
(D) electrical energy

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A object that does not produce light but it reflects light that comes from luminous object is called...?

(A) Luminous
(B) Non-luminous

(C) Reflective
(D) Illuminated

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Total internal reflection of light is possible when light enters from ____...?

(A) Air to water
(B) Glass to glass

(C) Water to air
(D) Air to glass

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How many light years the earth and sun are away from the center of Milky Way galaxy...?

(A) 27000
(B) 23000

(C) 20000
(D) 25000

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When a person enters a dark room from bright light he is not able to see clearly for a little while because the...?

(A) Eye is unable to adjust itself immediately
(B) Retina becomes insensitive momentarily

(C) Iris is unable to dilate the pupil immediately
(D) Distance between the lens and retina take time to adjust

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Day and night are the results of__________...?

(A) Earth rotation around its axis
(B) Earth revolution

(C) Earth rotation accompanied with its revolution.
(D) None of these

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The process in which nuclei of heavy elements are broken into lighter nuclei and produce a large amount of heat energy is called...?

(A) Fusion
(B) Geometry

(C) Regales
(D) Fission

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Which cells are responsible for vision in bright light and coloured vision...?

(A) Rod Cells
(B) Cone Cells

(C) Bipolar Cells
(D) Ganglion Cells

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The Moon is illuminated because it ________ the light from the Sun....?

(A) Absorbs
(B) Reflects

(C) Deflects
(D) Refracts

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Which term describes the emission of light by a living organism...?

(A) Natural light
(B) Bioluminescence

(C) Illumination
(D) Mimicry

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Recently, scientists observed the merger of giant ‘blackholes’ billions of light-years away from the Earth. What is the significance of this observation...?

(A) ‘Higgs boson particles’ were detected.
(B) Gravitational waves’ were detected.

(C) Possibility of inter-galactic space travel through ‘wormhole’ was confirmed.
(D) It enabled the scientists to understand ‘singularity’.

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The lens which refract the parallel rays of light are called ____...?

(A) Diverging Lens
(B) Prim

(C) Cylindrical Lens
(D) Converging Lens

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If an opaque object is moved further away from the light source, the shadow gets _____...?

(A) Smaller
(B) Bigger

(C) Darker
(D) Lighter

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The process of splitting water molecules in the presence of light energy is called_________...?

(A) Electrolysis
(B) Photolysis

(C) Radiolysis
(D) Thermolysis

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The primary colors of light are _____...?

(A) 2
(B) 3

(C) 4
(D) 5

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UV light falls in the category of___________...?

(A) Ionizing Radiations
(B) Non Ionizing Radiation

(C) Visible light
(D) None

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Sunlight is a Great Source of ____________...?

(A) vitamin C
(B) vitamin D

(C) vitamin E
(D) vitamin K

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If an Opaque object is moved closer to the light source the shadow gets _______...?

(A) Smaller
(B) Very Smaller

(C) Bigger
(D) Older

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When the ray of lights strikes on the brick wall, it is...?

(A) Passed through it
(B) Scattered by it

(C) Reflected by it
(D) None

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The Velocity of light in a diamond is (whereas the refractive index of a diamond with respect to vacuum is 2.5)...?

(A) 5x10^8m/s
(B) 2.5x10^8m/s

(C) 1.2x10^10m/s
(D) 1.2x10^8m/s

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Which of the following is mainly used for light patrol engines ...?

(A) Kerosene oil
(B) Paraffin oil

(C) Heavy Fuel oil
(D) Gasoline

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About the requirement of light for germination...?

(A) Some seeds germinate in dark whereas some require light
(B) All seeds germinate in dark

(C) All seeds germinate in light
(D) None

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The day and night are formed due to 'Earth' rotation on its axis from...?

(A) North to south
(B) South to North

(C) West to East
(D) East to West

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A child rubbed two balloons with a piece of wool. Which of the following happens when the balloons are brought near each other...?

(A) The balloons will attract each other
(B) The balloons will repel each other

(C) The balloons will stick to the child's hair
(D) The balloons will make a loud noise

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When the moon comes in front of the sun and blocks most of the sunlight from reaching the earth is known as...?

(A) A Solar Eclipse
(B) A Lunar Eclipse

(C) A Venus Eclipse
(D) A Earth Eclipse

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Light reaches us from the Sun is about 8 minutes and from Sirius in about _____...?

(A) 8 minutes
(B) 8 days

(C) 8 months
(D) 8 years

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Why normal rain is slightly acidic...?

(A) due to presence of dust in air
(B) carbon dioxide and water in clouds react to form carbonic acid

(C) Ozone depletion
(D) All of these

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Electron has a much shorter wavelength than visible light, and this allows electron microscopes to produce _____ images....?

(A) Lower-resolution
(B) Higher-magnification

(C) Equal-resolution
(D) Higher-resolution

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A man presses more weight on earth at___...?

(A) Sitting position
(B) Standing Position

(C) Lying Position
(D) None of these

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What is the date when day and night are equal...?

(A) March 21 and December 24
(B) January 14 and September 23

(C) March 20 and September 23
(D) January 14 and June 22

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In the absence of sunlight, the entire food chain would become...?

(A) Active and Thrive
(B) Unaffected and Stable

(C) Slow but Survive
(D) Inactive and Collapse

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What causes the stars in space to absorb and scatter starlight that resulting in a reduction in their brightness...?

(A) Planets and Moons
(B) Asteroids and Comets

(C) Black Holes and Neutron Stars
(D) Dust and Gas

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Magnification of a light microscope is formed by using mixture of the power of the eyepiece and the _____ lens....?

(A) Concave
(B) Convex

(C) Objective
(D) Mirror

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When a ray of sunlight enters a dark room , its straight path become visible because of dust particles hanging in the air. It is because light is _________...?

(A) Visible
(B) Transparent

(C) Invisible
(D) opaque

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