NSO Level 1- Science Olympiad (SOF) Class 8: Questions 449 - 452 of 1076

Access detailed explanations (illustrated with images and videos) to 1076 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. Unlimited Access for Unlimited Time!

View Sample Explanation or View Features.

Rs. 450.00 or

How to register?

Question number: 449

» Metals and Non-Metals

Edit
MCQ▾

Question

Sodium and potassium are kept in kerosene. The reason behind this statement is

Choices

Choice (4)Response

a.

They react vigorously with oxygen and water

b.

They generate a lot of heat energy when exposed to air or water

c.

Sodium and Potassium are highly reactive metals

d.

All a. , b. and c. are correct

Question number: 450

» Synthetic Fibres and Plastics

Edit
MCQ▾

Question

Classify the following into biodegradable and non biodegradable substances

  1. Paper, 2. Polythene bag, 3. Metals, 4. Wood, 5. Rock, 6. cotton

Choices

Choice (4)Response

a.

1,5, 6 – biodegradable and 2,3, 4 – non biodegradable

b.

1,4, 6 – biodegradable and 2,3, 5 – non biodegradable

c.

1,3, 6 – biodegradable and 2,4, 5 – non biodegradable

d.

1,2, 3 – biodegradable and 4,5, 6 – non biodegradable

Question number: 451

» Synthetic Fibres and Plastics

Edit
MCQ▾

Question

The material used for non stick coating is

Choices

Choice (4)Response

a.

Bakelite

b.

Teflon

c.

PVC

d.

Polythene

Question number: 452

» Synthetic Fibres and Plastics

Edit
MCQ▾

Question

There are two waste drums in Teena’s housing colony. One is green and the other is red. Green is for collecting biodegradable waste and red is for collecting non biodegradable waste. Teena wants to dispose the following things. Please help her to segregate it.

Image of Waste Drums

Image of Waste Drums

Choices

Choice (4)Response

a.

Plastic and wooden toys – red, crockery and woollen clothes - green

b.

Plastic and woollen clothes – red, wooden toys and crockery - green

c.

Plastic and crockery – green, wooden toys and woollen clothes - red

d.

Plastic and crockery – red, wooden toys and woollen clothes - green

Developed by: