1). By what mechanism does scent spread all over the room if the lid is opened ?
A). Pressure in the bottle |
B). Compression from the bottle |
C). Diffusion |
D). Osmosis |
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2). What type of mixture is smoke ?
A). Solid mixed with a gas |
B). Gas mixed with a gas |
C). Liquid mixed with a gas |
D). Gas mixed with a liquid and a solid |
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3). A compound that is a white solid which absorbs water vapour from the air is :
A). Sodium nitrate |
B). Calcium chloride |
C). Sodium carbonate |
D). Calcium sulphate |
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4). What are the elements which are liquids at room temperature and standard pressure ? 1. Helium 2. Mercury 3. Chlorine 4. Bromine Select the correct answer using the code given below :
A). 2 and 3 only |
B). 2, 3 and 4 |
C). 2 and 4 only |
D). 1 and 3 |
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5). Which one among the following colours has the highest wavelength ?
A). Violet |
B). Green |
C). Yellow |
D). Red |
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6). Which one among the following is not a correct statement ?
A). Cathode rays are negatively charged particles |
B). Cathode rays are produced from all the gases |
C). Electrons are basic constituents of all the atoms |
D). Hydrogen ions do not contain any proton |
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7). \( \Large NaOH + HCL -> NaCl + H_{2}O \) In the above chemical reaction ;
A). Sodium is oxidized and oxygen is reduced |
B). Sodium is oxidized and chlorine is reduced |
C). Sodium and hydrogen are oxidized |
D). None of them are oxidized or reduced |
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8). Which element forms the highest number of compounds in the periodic table ?
A). Carbon |
B). Oxygen |
C). Silicon |
D). Sulphur |
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9). Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent :
A). reduces drastically the surface tension between water and oil |
B). increases the surface tension between water and oil |
C). increases the viscosity of water and oil |
D). decreases the viscosity in detergent mixed water |
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10). Motion of an oscillating liquid column in a U-tube 1s :
A). periodic but not simple harmonic |
B). non periodic |
C). simple harmonic and time period is independent of the density of the liquid |
D). simple harmonic and time period depends on the density of the liquid |
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