CBSE (Central Board of Secondary Education- Board Exam) Class-8 Science: Questions 58 - 66 of 469

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Question number: 58

» Microorganisms: Friend and Foe » Microorganisms » Protozoa and Algae

MCQ▾

Question

Name algae which is natural source of silica is

Choices

Choice (4) Response

a.

Diatoms

b.

Nostoc

c.

Chlorella

d.

Red algae

Question number: 59

» Crop Production and Management » Harvesting » Harvesting

MCQ▾

Question

Which tool is used manually for harvesting a crop?

Choices

Choice (4) Response

a.

Thresher

b.

Trowels

c.

Harrows

d.

Sickles

Question number: 60

» Microorganisms: Friend and Foe » Microorganisms » Bacteria and Fungi

MCQ▾

Question

Nitrogen fixing bacteria are:

Choices

Choice (4) Response

a.

Rhizobium, Azotobacter

b.

Escherichia Coli, Peneumococcus

c.

Lactobacillus, Salmonella typhi

d.

Treponema, Vibrio

Question number: 61

» Microorganisms: Friend and Foe » Microorganisms » Bacteria and Fungi

MCQ▾

Question

Name the micro-organism helps in formation of bread.

Choices

Choice (4) Response

a.

Yeast

b.

Bacteria

c.

Protozoa

d.

Virus

Question number: 62

» Microorganisms: Friend and Foe » Microorganisms » Virus

MCQ▾

Question

Viruses found in the bacteria is called as

Choices

Choice (4) Response

a.

Plant Viruses

b.

Animal Viruses

c.

RNA/DNA Viruses

d.

Bacteriophage

Question number: 63

» Crop Production and Management » Irrigation » Modern Methods of Irrigation

MCQ▾

Question

Which method of irrigation is used for uneven land?

Choices

Choice (4) Response

a.

Rahat

b.

Drip system

c.

Moat

d.

Sprinkler System

Question number: 64

» Microorganisms: Friend and Foe » Microorganisms » Where Do Microorganisms Live?

MCQ▾

Question

Curd is formed by the process of:

Choices

Choice (4) Response

a.

Reduction

b.

Fertilization

c.

Fermentation

d.

Oxidation

Question number: 65

» Microorganisms: Friend and Foe » Food Preservation » Heat and Cold Treatments

MCQ▾

Question

Full form of UHT is:

Choices

Choice (4) Response

a.

Ultra hot treatment

b.

Ultra heat treatment

c.

Unique heat treatment

d.

Ultra hot temperature

Question number: 66

» Microorganisms: Friend and Foe » Microorganisms » Bacteria and Fungi

MCQ▾

Question

Friendly micro-organisms are:

Choices

Choice (4) Response

a.

Azotobater, Sea weeds

b.

Lactobacillus, Penicilliumnotatum

c.

Salmonella typhi, Bacillus anthracis

d.

Both a. and b. are correct

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