Science cbse 7th ch -12
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HEYA!
Q.1) Speed of light varies with
Particle nature
Medium
Colour
Wave nature
Correct Answer: Medium
Q.2) A number of rays from different direction assemble at point are called
Parallel rays
Convergent rays
Divergent rays
Intersecting rays.
Correct Answer: Convergent rays
Q.3) If you stand before a plane mirror, your left hand appears right. This phenomenon is
Lateral inversion of light
Reflection of light
Diffusion of light.
Shadow formation
Correct Answer: Lateral inversion of light
Q.4) The point on principal axis though which all the rays parallel to principal axis passes after reflection is called
Focal length
Pole
Radius of curvature
Focus
Correct Answer: Focus
Q.5) Glow worm is a natural biological
Opaque body
Luminous body
Sparkling body
Non-luminous body
Correct Answer: Luminous body
Q.6) Periscope is based on
Dispersion of light
Scattering of light
Refraction of light
Reflection of light
Correct Answer: Reflection of light
Q.7) Which type of mirror is used as concentrator in solar furnace?
Concave mirror
Plane mirror
Bifocal mirror
Convex mirror
Correct Answer: Concave mirror
Q.8) Moon is a
Reflector of sunlight
Refractor of sunlight
Luminous body
Transparent body
Correct Answer: Reflector of sunlight
Q.9) Shadows are formed when light falls on an ______________ object.
Transparent
Opaque
Permeable
Translucent
Correct Answer: Opaque
Q.10) Travelling of light in straight line is called
Linear propagation of light
Straight propagation of light
Bending of light
Rectilinear propagation of light
Correct Answer: Rectilinear propagation of light
Q.11) In regular reflection
Reflected rays are parallel to each other
Reflected rays are perpendicular to each other
All of the above
Angel of incidence is not equal to angle of reflection
Correct Answer: Reflected rays are parallel to each other
Q.12) Red colour is used as danger signal because. It has
Bright colour
It can be seen by colour blinds also
Short wavelength
Long wavelength
Correct Answer: Long wavelength
Q.13) Speed of light
Decrease in rarer medium
Remain same in all medium
Increase in denser medium
Changes with medium
Correct Answer: Changes with medium
Q.14) Light is a form of
Energy
Heat
Power
Temperature
Correct Answer: Energy
Q.15) Convex mirror is used as rear view mirror because
It form virtual image of same size
It forms virtual and inverted image
It forms real and erect image
It forms erect and diminished image
Correct Answer: It forms erect and diminished image
HOPE THIS HELPS
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