SCIENCE REVISION BANK TERM 1

 SCIENCE REVISION BANK TERM 1

Section A
1.	X is a separation technique used only when the components of a solid-solid mixture have different sizes. Identify X.
	(a)	Winnowing
	(b)	Sieving
	(c)	Threshing
	(d)	Magnetic separation
2.	Identify X in the given Venn diagram.
	(a)	Cotton
	(b)	Wool
	(c)	Silk
	(d)	Nylon
3.	In ancient times, the length of a foot, the width of a finger, and the distance of a step were commonly used as different units of measurements. However, everyone's body parts could be of slightly different sizes. This must have caused confusion in measurement. In 1790, the French created a standard unit of measurement called the metric system. For the sake of uniformity, scientists all over the world have accepted a set of standard units of measurement. The system of units now used is known as the International System of Units (SI units).
	Which of the following is NOT a non-standard unit of measurement?
	(a)	Metre
	(b)	Foot span
	(c)	Hand span
	(d)	Cubit
4.	In ancient times, the length of a foot, the width of a finger, and the distance of a step were commonly used as different units of measurements. However, everyone's body parts could be of slightly different sizes. This must have caused confusion in measurement. In 1790, the French created a standard unit of measurement called the metric system. For the sake of uniformity, scientists all over the world have accepted a set of standard units of measurement. The system of units now used is known as the International System of Units (SI units).
	One gram has been divided into 1000 equal parts; each part is equal to:
	(a)	One ton
	(b)	One kilogram
	(c)	One milligram
	(d)	One quintal
5.	In ancient times, the length of a foot, the width of a finger, and the distance of a step were commonly used as different units of measurements. However, everyone's body parts could be of slightly different sizes. This must have caused confusion in measurement. In 1790, the French created a standard unit of measurement called the metric system. For the sake of uniformity, scientists all over the world have accepted a set of standard units of measurement. The system of units now used is known as the International System of Units (SI units).
	An ant moves as shown in the diagram. Which of the following can be used to determine the distance covered by this ant?
	(a)	A 15 cm scale and a metre scale
	(b)	Only a metre scale
	(c)	Hand span and a metre scale
	(d)	Thread and a metre scale
Section B
6.	(a)	For the given questions two statements are given – one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
		(I)          Both A and R are true and R is correct explanation of the assertion A       (II)          Both A and R are true, but R is not the correct explanation of the assertion A.      (III)          A is true but R is false.     (IV)          A is false but R is true.
		(i)	Assertion:  A gold coin floats on water. Reason: A substance will only float on a liquid if its density is less than that of the surrounding liquid.
		(ii)	Assertion: Smoke is an example of a mixture. Reason:  A mixture is a combination of two or more pure substances.
	(b)	(i)	Name the process of conversion of water vapour into its liquid form.
		(ii)	Name the type of motion that repeats itself at regular intervals of time.
		(iii)	Fill in the blank:
			The substances which disappear or dissolve completely in water are called ________________ substances.
7.	The distance between Amay’s house and his school is 5750 m. Express this distance in km.
8.	Tulsi wants to separate a mixture of oil and water. Name the method she can use to separate oil and water. Give reasons for your answer.
9.	Answer the following questions:
	(a)	State the climatic condition favourable for the growth of the jute plant.
	(b)	In which states of India is jute mainly grown?
	(c)	What is retting?
	(d)	What is spinning? Name two devices that can be used for spinning.

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