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10th science Refresher Course 9-MATTER AROUND US answer key
10th science Refresher Course-9-MATTER AROUND US-answer key
EVALUATION
I. CHOOSE THE BEST ANSWER: -
1. The metal which is in liquid state is ____________________
(a) Carbon
(b) Mercury
(c) Copper
2. Ozone (O3
) contains ______________ number of oxygen atoms
(a) 1
(b) 3
(c) 2
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3. The property which allows metals to be hammered into thin sheets is _________
(a) Ductility
(b) Malleability
(c) Lustrous
4. The symbol of carbon is _______________
(a) N
(b) Ca
(c) C
5. ________________ is a liquid metal which is used in thermometers.
(a) Aluminum
(b) Mercury
(c) Phosphorus
6. Water contains _____________ and __________ element.
7. ____________ have high melting point [Metal / Non-metal]
8. Every matter exists in ________________,___________________ and
________________ state.
9. The symbol of aluminum is _____________________________
10.___________________ is the chemical name of common salt [Sodium Carbonate / Sodium Chloride]
II. PICK OUT THE ODD ONE:
1. Water, Salt, Sugar, Sulphur
2. Aluminum, Gold, Sulphur, Iron
III. MATCH THE FOLLOWING
Element - Settles down on standing
Compound - Impure substance
Colloid - Made up of molecules
Suspension - Pure substance
Mixture - Made up of atoms
IV. Write the correct words from the scrambled words given in the barcket
1. The air we breathe consist of ________________ [YGENOX]
2. Ornaments are made of _____________________ [LDGO]
V. Fill in the blanks
1. The gas which helps to keep swimming pool clean is _________________
2. Ammonia (NH3 )contains of ________________ and ___________ element.
3. Write the names of any two compounds name, used in your house.
4. Compounds are classified into inorganic compound and ___________ compound.
5. ________________ element is used to prepare matches and rat poison.
6. Alcohol can be separated from water by ________________
7. A few drops of ‘Dettol’ when added to water turns the mixture turns turbid. Why?
