HARD
8th CBSE
IMPORTANT
Earn 100

What is petroleum refining? Draw a labelled diagram of a fractionating column.

Important Questions on Test

EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 13

Yeast and sugar are added to a bottle of warm water. A balloon is fixed over the mouth of the bottle. After some time, the balloon inflates as yeast breaks down the sugar and releases gas. Which gas does it release?

EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 14
A battery and bulb are connected. The free ends of the wires from the battery and the bulb are brought in contact with items A, B, C, and D, one by one. The bulb does not light up when the wires touch C. which of these could C be made of?
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 15
A clean iron nail is dropped into a test tube filled with copper sulphate solution. After an hour, the solution which was blue in colour turns green. The iron nail has a reddish-brown deposit on it. Identify the green solution. Identify the reddish-brown deposit.
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 1
What is an electrolyte?
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 2
Name a scale used to measure the magnitude of an earthquake.
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 3
In which case will you exert greater pressure on the ground-if you wear shoes with pointed heels or if you wear slippers? Why?
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 4
To increase the loudness of sound by 16 times, by how much should the amplitude of vibration be changed?
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 5

Study the diagram and answer the questions.

Question Image

Define the term net force.