Q1:
An object is placed at a distance of 30 cm from a concave lens of focal
length 15 cm. List four characteristics (nature, position, etc.) of the image
formed by the lens.
Q2:
State two advantages of conserving (i) forests, and (ii) wild-life.
Q3:
Explain two main advantages associated with water harvesting at the community level.
Q4:
A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen.
(A) In which direction does he move the lens to focus the flame on the screen ?
(B) What happens to the size of the image of the flame formed on the screen ?
(C) What difference is seen in the intensity (brightness) of the image of the flame on the screen ?
(D) What is seen on the screen when the flame is very close (at about 5 cm) to the lens ?
Q5:
Draw in sequence (showing the four stages), the process of binary fission
in Amoeba.
Q6:
Why must we conserve our forests ? List two factors responsible for causing deforestation.
Q7:
Why is an equitable distribution of resources essential in a society ? List two forces which are against such distribution
Q8:
An object is placed at a distance of 15 cm from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
Q9:
Why are coal and petroleum categorised as natural resources ? Give a reason as to why they should be used judiciously.
Q10:
You being an environmentalist are interested in contributing towards the conservation of natural resources. List four activities that you can do on your own.
Q11:
An object is placed at a distance of 15 cm from a concave lens of focal length 30 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
Q12:
Draw in sequence (showing the four stages), the process of binary fission in Amoeba.
Q13:
Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction
Q14:
In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by
(A) y, p, z
(B) x, q, z
(C) p, y, z
(D) p, z, y
Q15:
Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction
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