Multiple Choice Questions (MCQs)
Lakhmir Singh Science Solutions for Exercise - Multiple Choice Questions (MCQs)
Simple step-by-step solutions to Multiple Choice Questions (MCQs) questions of Physical and Chemical Changes from AWARENESS SCIENCE for Seventh Class. Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.
Questions from Multiple Choice Questions (MCQs) with Hints & Solutions
Which of the following are physical changes?
A. Melting of iron metal
B. Burning of iron filings
C. Rusting of iron metal
D. Drawing a wire of iron metal
Which of the following is not a characteristic of a physical change?
The gas which turns lime water milky is:
The ozone layer in the upper atmosphere of the earth absorbs most of the:
The rusting of iron can be prevented by coating it with a layer of:
A. Zinc
B. Sodium
C. Chromium
D. Carbon
Impure copper sulphate powder can be purified by the process of:
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as liquid. When it comes out from the cylinder, it becomes a gas (change - A), then it burns (change - B). The following statements pertain to these changes. Choose the correct one.
Anaerobic bacteria digest animal waste and produce biogas (change A). The biogas is then burnt as fuel (change B). The following statements pertain to these changes. Choose the correct one:
