Online Test      LOGIN      SIGN UP
Forgot your password?
  • Class 7 Science Study Material

An Educational platform for Preparation and Practice Class 7. Kidsfront provide unique pattern of learning Science with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Science for Class 7. This study material help Class 7, Science students in learning every aspect of Light . Students can understand Light concept easily and consolidate their learning by doing Online Practice Tests on Science ,Light chapter repeatedly till they excel in Class 7, Light . Free ONLINE PRACTICE TESTS on Class 7, Light comprise of Hundreds of Questions on Light , prepared by the highly professionals team. Every repeat test of Light will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Light . Attempt ONLINE TEST on Class 7,Science ,Light in Academics section after completing this Light Question Answer Exercise.


Unique pattern

  • Topic wise:Light preparation in the form of QUESTION & ANSWER.
  • Evaluate preparation by doing ONLINE TEST of Class 7, Science ,Light .
  • Review performance in PRACTICE TEST and do further learning on weak areas.
  • Attempt repeat ONLINE TESTS of Science Light till you excel.
  • Evaluate your progress by doing ONLINE MOCK TEST of Class 7, Science , All TOPICS.


Light
Concave mirror

a) Has a reflecting surface that bulges inward.
b) Has a reflecting surface that bulges outward.
c) Is also called as a diverging mirror.
d) Is also called a plane mirror.



Answer
Solution
Correct Answer Is : Has a reflecting surface that bulges inward.
Solution Is : A concave mirror or converging mirror has a reflecting surface that bulges inward and the outer surface is painted.
A kaleidoscope is

a) An optical toy.
b) A magnetic toy.
c) An electrical toy.
d) An electromagnetic toy.



Answer
Solution
Correct Answer Is : An optical toy.
Solution Is : Kaleidoscope is an optical toy which uses plane mirrors and is based on the principle of multiple reflections of light. It makes use of three plane mirrors arranged at 60 degree angle to each other in a tube. This instrument is use to make new designs.
An image obtained by a plane mirror, the left side of an object appears to be

a) The
b) The
c) The
d) The



Answer
Solution
Correct Answer Is : The
Solution Is : An image obtained by a plane mirror is laterally inverted, i.e., the left side of an object appears to be?the right side of an image and the right side of an object appears to be the left side of an image.
In the side mirror of a car, the size of the images of all the objects appear to be

a) Same as that of the size of the objects.
b) Smaller than the objects.
c) Larger than the objects.
d) Of point size.



Answer
Solution
Correct Answer Is : Smaller than the objects.
Solution Is : The side mirror of a car is a convex mirror. The image formed by a convex mirror is virtual, erect and smaller than the size of the object.
Generally, the colour of the sunlight is

a) Blue in colour.
b) Yellow in colour.
c) White in colour.
d) Orange in colour.



Answer
Solution
Correct Answer Is : White in colour.
Solution Is : When sunlight is made to pass through a glass prism, we get seven rainbow colours. By rotating the seven rainbow coloured Newton`s disc, we get white colour. Thus, sunlight is white in colour.
Concave mirror is a

a) Spherical mirror.
b) Plane mirror.
c) Cylindrical mirror.
d) Curvilinear mirror.



Answer
Solution
Correct Answer Is : Spherical mirror.
Solution Is : The concave mirror is a spherical mirror. It is so called because it is a part of a sphere whose outer surface is silver coated and the reflections takes place from the inner surface.
When a small circular disc painted with seven colours of the rainbow is rotated, we see

a) The seven colours appearing blured.
b) The seven colours appearing bright.
c) Only black colour.
d) Only white colour.



Answer
Solution
Correct Answer Is : Only white colour.
Solution Is : Sir Isaac Newton demonstrated that white light is a combination of the seven different colours found in a rainbow (splitting of white sunlight when pass through the prism into seven colours). If a small circular disc with seven rainbow colours painted on it, is rotated fast, all the colours get mixed up and the disc`s colour appears to be white.
Objects become visible to us because

a) Light is absorbed by them.
b) Light is reflected by them before reaching our eyes.
c) They
d) Light passes through them.



Answer
Solution
Correct Answer Is : Light is reflected by them before reaching our eyes.
Solution Is : We can see the objects only when light falls on them and gets reflected towards our eye.
Height of candle is 10 cm. Height of its image seen in the plane mirror is

a) 20 cm.
b) 5 cm.
c) 10 cm.
d) 1 m.



Answer
Solution
Correct Answer Is : 10 cm.
Solution Is : An image formed by a plane mirror is erect and of the same size as that of an object. In this case, the height of an image formed is same as that of an object which is 10 cm.
You cannot see the flame of a lighted candle through a bent pipe but you can see it through a straight pipe, because

a) Light travels in a straight line.
b) Pipe is polished.
c) Bent pipe was blocked.
d) The straight pipe is



Answer
Solution
Correct Answer Is : Light travels in a straight line.
Solution Is : You cannot see the flame of a lighted candle through a bent pipe but you can see it through a straight pipe, because light always travel in a straight line.
PREVIOUS
script type="text/javascript">