Academic year: 2014-2015Mid Term Test IIIName:Subject: ScienceGrade: VIIMax. Marks: 50Date : 15 .12.2014Duration: I. Answer the following: (6 x 2 = 12)1. What is angle of incidence and angle of reflection?2. What is reflection? State two laws of reflection.3. Define Physical Charge.4. Define the term aquifer? 5. How will you define a forest?6. What is humus?II. Answer the following:(6 x 3 = 18)1. Describe ray of light, beam of light, convergent and divergent beam of light.2. A person in a dark room looking through a window can clearly see a person outside standing under a lamp post whereas the person outside cannot see the person inside. Explain.3. Explain how ground water is recharged.4. Explain why rusting of iron objects is faster in coastal areas than deserts? 5. What are the main products which we obtain from forests? 6. Explain how forests prevent floods.III Answer in detail: (4 x 5 =20)1. A light ray from reflects from a plane mirror as shown in the figure. What is the angle of deviation ?

(Or)Two mirrors are arranged as shown in the figure. Light is incident on the first mirror at an angle of 350. The light reflects towards a second mirror. Determine the angle .

2. Explain the following i) Rusting (2) ii) Galvanization (1)iii) characteristics of chemical change (2)(Or)Explain the following: i) Infiltration (1) ii) Factors responsible for the depletion of water table (4)3. Write the importance of forests. (Or)Write about the conservation of forests.4. State the main difference between asexual and sexual reproduction. (Or)Draw and label Human excretory system.

Academic year 2014-2015Mid Term Test IIIName:Subject: ScienceGrade: VIII-AMax.marks: 50Date : 19.12.2014Duration:

I Answer the following: (6 x 2 = 12)

1. What do you mean by lateral inversion? 2. State laws of reflection.3. Define the term air pollution4. What is potable water?5. Give two differences between a zygote and a foetus.6. What is metamorphosis?

II Answer the following:(6 x 3 = 18)

1. Explain image formation by plane mirror.2. Explain real object, real image, virtual object, virtual image.3. Write a note on carbon monoxide.4. What is smog? What are the harmful effects of smog?5. What is an ovum? Explain its structure.6. Explain the asexual reproduction in hydra with diagram.

III Answer in detail: (4 x 5 =20)

1. Two plane mirrors are incline at an angle by 1200. If a ray strikes mirror M1, at a 650 angle of incidence, at what angle does it leave mirror M2.(Or)A ray of light is incident on a horizontal plane mirror at an angle of incidence 300. At what angle should a second plane mirror be inclined to the horizontal mirror so that reflected ray from the horizontal mirrors is reflected by the second mirror horizontally?

2. Explain the three methods of purifying water.(Or)(i)What is green house effect? Name some green house gases.(ii)Explain how human activities lead to global warming.

3. What is fertilization? Explain various types of fertilization. (Or)Define asexual reproduction. Describe two methods of asexual reproduction in animals.

4. Draw the structure of plant cell and label the parts.(Or)Draw the structure of animal cell and label the parts.