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Practice each question, then open the answer or worked solution.
An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull?
Ans: The correct answer is option b) Soft drink.
Soft drinks are composed of water, carbon dioxide and acid due to which the iron nail is corroded and appears dull.
Pick one material from the following which is completely soluble in water.
Ans: The correct answer is option c) Glucose.
Among the given options, only glucose is highly soluble in water.
You are provided with the following materials
(i) Magnifying glass
(ii) Mirror
(iii) Stainless steel plate
(iv) Glass tumbler
Which of the above materials will you identify as transparent?
Ans: The correct answer is option c) (i) and (iv).
The objects through which we can see at the other side are known as transparent objects. Transparent objects include magnifying glasses and glass tumblers.
Boojho found a bag containing the following materials
(i) Mirror
(ii) Paper stained with oil
(iii) Magnet
(iv) Glass spectacles
Help Boojho in finding out the material(s) which is/are opaque.
Ans: The correct answer is option c) (i) and (iii).
Mirror and magnet are opaque. Mirror is the glass painted on one side. And the magnet is made up of iron metal.
While doing an activity in class, the teacher asked Paheli to handover a translucent material. Which among the following materials will Paheli pick and give her teacher?
Ans: The correct answer is option c) Muslin cloth.
The objects through which we cannot see clearly are known as translucent. Muslin cloth is a translucent object. Aluminium foils and mirrors are opaque. Glass tumbler is transparent.
Which pair of substances among the following would float in a tumbler half filled with water?
Ans: The correct answer is option b) feather, plastic ball.
The lighter material floats in water whereas the heavier material sinks in water.
Which among the following are commonly used for making a safety pin?
Ans: The correct answer is option d) Steel and plastic. Steel is easily moulded. It can be changed into any shape to get sharp points and plastic is used to seal the edges.
Which of the following materials is not lustrous?
Ans: The correct answer is option c) Wood.
Wood is an organic opaque structure and is not lustrous.
Which of the following statements is not true?
Ans: The correct answer is option c) Materials are grouped for fun.
Materials are not grouped for fun. They are grouped to study their properties and according to their uses in a systematic manner.
Find the odd one out from the following
Ans: The correct answer is option d) Eraser.
Eraser is made up of an elastic material rubber whereas tawa, spade and pressure cooker are made up of steel metal.