10th Science Online Test (Lesson 6, 7, 8)

SSLC New Science Book One mark Question Free Online Test (Lesson 6, 7, 8)

1. Which of the following methods is suitable for preventing an iron pan from rusting?
(A) Applying grease
(B) applying a coat of zinc
(C) Applying paint
(D) all the above
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2. Food cans are coated with tin and not zinc because
(A) Zinc is costlier than
(B) zinc has a higher melting point than tin
(C) Zinc is more reactive than tin
(D) zinc is less reactive than tin
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3. The articles made-up of copper become green on prolonged exposure to air and moisture. This is due to formation of layer of its.
(A) Oxide
(B) hydride
(C) sulphide
(D) carbonate
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4. The correct increasing order of the atomic radii of the elements oxygen, fluorine, nitrogen is
(A) O,F,N
(B) N,F,O
(C) O,N,F
(D) F,O,N
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5. . On moving from left to right in a period of the periodic table the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?
(A) Increase
(B) decrease
(C) remains same
(D) first increase then decrease
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6. In exothermic process as the temperature increases, solubility of the salt is _____
(A) Increase
(B) decrease
(C) No change
(D) first increase then decrease
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7. An example for a solution containing liquid solute and gas solvent is
(A) Soda water
(B) cloud
(C) cork
(D) smoke
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8. What is the name given to the liquids which dissolve solids?
(A) Solute
(B) solvent
(C) solution
(D) mixture
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9. In alumino thermic process aluminum acts as
(A) Oxidizing agent
(B) reducing agent
(C) flux
(D) none of these
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10 The process of heating the ore in the absence of air is called
(A) Roasting
(B) liquation
(C) calcinations
(D) smelting
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