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Light – Reflection and Refraction

Under which of the following conditions a concave mirror can form an image larger than the actual object?
(a) When the object is kept at a distance equal to its radius of curvature
(b) When object is kept at a distance less than its focal length
(c) When object is placed between the focus and centre of curvature
(d) When object is kept at a distance greater than its radius of curvature

07/11/2024

Science

10th

Light – Reflection and Refraction

A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in
front of the mirror. The focal length of this mirror is
(a) – 30 cm (b) – 20 cm
(c) – 40 cm (d) – 60 cm

07/11/2024

Science

10th

Light – Reflection and Refraction

Which of the following can make a parallel beam of light when light from a point source is incident on it?
(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90° to each other
(d) Concave mirror as well as concave lens

07/11/2024

Science

10th

Heredity and Evolution

Give reasons for the appearance of new combinations of characters in the Fprogeny.

07/11/2024

Science

10th

Heredity and Evolution

Give the basic features of the mechanism of inheritance.

07/11/2024

Science

10th

Heredity and Evolution

Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.

07/11/2024

Science

10th

Heredity and Evolution

Give reasons why acquired characters are not inherited.

07/11/2024

Science

10th

Heredity and Evolution

Differentiate between inherited and acquired characters. Give one example for each type.

07/11/2024

Science

10th

Heredity and Evolution

All the human races like Africans, Asians, Europeans, Americans and others might have evolved from a common ancestor. Provide a few evidences in support of this view

07/11/2024

Science

10th

Heredity and Evolution

Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria? Provide a suitable explanation.

07/11/2024

Science

10th