The Ever-Evolving World of Science
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Happy Exploring!
SubtopicHappy Exploring! under The Ever-Evolving World of Science for Grade 7 CBSE.
Preview questions (no answers)
- 1.
A virtual image is an image that:
A.Can be caught on a screen
B.Cannot be caught on a screen
C.Is always upside down
D.Is only formed by sunlight
- 2.
Which gas is used by plants during photosynthesis and released by animals during respiration?
A.Oxygen
B.Carbon Dioxide
C.Nitrogen
D.Argon
- 3.
A lens which is thinner in the middle than at the edges is called a:
A.Convex lens
B.Concave lens
C.Plane lens
D.Bifocal lens
- 4.
The distance-time graph for an object moving with a constant speed is a:
A.Curved line
B.Straight line
C.Zig-zag line
D.Circle
- 5.
Science explores how energy is transformed from one form to another to sustain life on Earth. In the energy transformation pathway shown below, what is the specific form of energy stored within the 'Plants and Food' stage?
A.Thermal Energy
B.Mechanical Energy
C.Chemical Energy
D.Electrical Energy
- 6.
Scientific experiments require high precision. When measuring the length of an object with a meter scale, a student must be careful about the position of their eye. According to the diagram, which eye position is essential to avoid 'parallax error' and obtain an accurate reading?
A.Position A (Viewed from the left)
B.Position B (Viewed vertically above the point)
C.Position C (Viewed from the right)
D.All positions provide an accurate reading
- 7.
What is the chemical name of baking soda?
A.Sodium chloride
B.Sodium hydrogen carbonate
C.Calcium carbonate
D.Sodium hydroxide
- 8.
A spherical mirror has a focal length of . What can you conclude about the nature of this mirror?
A.It is a concave mirror.
B.It is a convex mirror.
C.It is a plane mirror.
D.It is a parabolic mirror.
- 9.
In the process of making bread, yeast is added. Why does the dough rise?
A.Yeast reproduces so fast that it takes up all the space.
B.Yeast undergoes anaerobic respiration and produces , which gets trapped in the dough.
C.Yeast produces heat which causes the air in the dough to expand.
D.The water in the dough reacts with yeast to produce steam.
- 10.
Which of the following is NOT a reason for the depletion of the water table?
A.Increasing population and industrialization.
B.Deforestation reducing the seepage of rainwater.
C.Excessive rainfall and flooding.
D.Increase in agricultural activities requiring groundwater.
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