Question

एक शंकु के ऊपर एक अर्धगोला आरोपित है यदि इसकी कुल ऊचाई 15 cm है वह आर्धगोला की त्रिजा 5 cm है तो शंकु की ऊचाई __ है?
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Answer 1

Step-by-step explanation:

HOLY CROSS BOY’S HIGH SCHOOL, BADNERA

First Term Examination 2020-2021(Practice paper/Optional)

Time: 2 Hours Class: IX Total Marks: 40

Subject: Science & Technology Part – II

………………………………………………………………………………………………………………………

Note: (i) All questions are compulsory.(ii) Draw scientifically correct

labeled diagrams wherever necessary.(iii) For each MCQ (i.e. Q.1 A)

evaluation would be done for first attempt only.

Q.1 (A) Complete the sentences by filling in the blanks and explain

those statements. [5]

[angiosperms , gymnosperms , spore , bryophyte , thallophyta ,

zygotebudding , mycotoxins , rhizobium ]

1 Toxins of fungal origin are called ………………..

2 Yeast reproduces asexually by the ……………….method.

3 Male and female flowers of …………………..are borne on different

sporophylls of ]the same plant.

4 ………………….plants have soft and fibre like body.

5 ……………………. Is called the’ amphibian’ of the plant kingdom.

(B) Solve the following questions : [5]

(1) Match the following [2]

Column ’A’ Column ‘B’

1. Clostridium a. Food poisoning

2. Yeast b. Nitrogen fixation

c. bakery products

d. products of antibiotics

(2) State whether the following statement is true or false. [1]

1. Computer will not work unless electric power supplied to it.

(3) Find the odd one out [2]

1. Pneumonia, diphtheria, chicken pox, cholera.

2. Root rot, rust (tambera), rubella , mozaic .

Q. 2 (A) Give scientific reasons (Any Two) [4]

1 Why are naphthalene balls kept with clothes to be put away.

2 Flow of nutrients through an ecosystem is cyclic.

3 Food accumulates on a surface of ‘dal’ kept for a long time in

summer.

(B) Solve the following sub questions (Any three) [6]

1 Write the characteristics of subkingdom phanerogams.

2 Explain the Oxygen cycle in your own words.

3 Which vaccines are given to infants? Why?

4 Explain the difference between degradable and non-degradable

waste.

5 How does a computer work?

Q.3. Solve the following questions. (Any Five): [15]

1 How is first aid provided to victims of disasters who are injured?

2 Explain the role and importance of information communication in

science and technology.

3 What is fermentation?

4 Sketch and label the figure of Funaria.

5 Are the antibiotics given to humans and animals the same? Why?

6 Why is e-waste harmful? Express your opinion about this.

7 What precautions should be taken while using various ty