P-2 Towards Green Energy — Science STD 10 — Question

How does the resistance of a wire change when:

1. Its length is tripled?
2. Its diameter is tripled?
3. Its material is changed to one whose resistivity is three times?

The cold object the hot object enclosed in one box of heat-resistant material.

1. What changes will occur in the two objects when temperature flows from those objects?
2. Which principle can show that the energy exchange takes place between two objects only when kept in isolated system?

(degenerated, red bone marrow, adipose connective tissue, blastocyst, umbilical cord, Differentiation)
………… of stem cells form can form various tissues, in the body. Stem cells are present in the ………….. by which the foetus is joined to the uterus of the mother. Stem cells are also present in the ……….. stage of embryonic development. Stem cells are present in ……….. and ………… of adult human beings. It has become possible to produce different types of tissues and the ……… part of any organ with the help of these stem cells.

What are the male and female gonads in human beings? Mention their functions.

Draw ray-diagrams to show the formation of images when the object is placed in front of a concave mirror (converging mirror):

1. Between its pole and focus.
2. Between its centre of curvature and focus Describe the nature, size and position of the image formed in each case.

Give the reference of following pictures and explain importance of each of those in disaster management. Which are other such activities ?

Observe the figure and write the answers to the following questions.

1. Write the name of the reaction shown in the following figure.
2. Write the above chemical reaction in the form of a balanced equation.
3. Write the name of the product produced in the above reaction, write a use.
4. Write the name of the catalyst used in the above reaction.

At what distance should an object be placed from a convex lens of focal length 18cm to obtain an image at 24cm from it on the other side? What will be the magnification produced in this case?

Draw a neat and labelled diagram to show the path of a ray of light in air and glass when the ray is incident obliquely on a glass slab. Show the (i) incident ray (ii) refracted ray (iii) emergent ray (iv) angle of incidence (v) angle of refraction (vi) angle of emergence in the diagram.
(OR)
Draw a neat and labelled diagram to show refraction of light through a glass slab.

What is lymph? State two major functions of lymph.