1. An experimentally useful definition of …

1. An experimentally useful definition of an element was given by (a)J J Berzellius (b) Robert Boyle XC) Lavoisier 2 Which of the following element is not a metalloid? (a)B (c) Ge 3. Which of the following property does not describe a compound? (a)lt is composed of two or more elements (b)lt is a pure substance (c)It cannot be separated into constituents by physical means (d) Both (a) and (b) (4) Si (d)It is mixed in any proportion by mass 4. According to the definition of the pure substance, which of the following is substance? (a)lce (b) Mercury Which of the following is/are true (c) Iron about heterogeneous mixture? (i) An opaque suspension is a heterogeneous mixture (ii)Colloidal solutions are heterogeneous mixture (iii)A mixture of two miscible liquids is a heterogeneous mixture (a)Only (1) (b) Only (ii) (c) Only (iii) (d) Both (i) and (ii) 6. Out of the following- Clouds, smoke, cheese and fog, the odd one out (a) Clouds At 0 C the (a) Solid (b) Cheese physical state of water is (b) Liquid (c) Fog (c) Both (a) and (b) (d) Smoke 7. is 5. a pure (d) All of these (d) gas 8. 20 gm of solute is dissolved in 50 gm of the solvent. The solubility of the solute is (a) 4 gm (b) 40 gm, (c) 10 gm 9. Which of these options is not a function of Ribosomes? (1) It helps in the manufacture of protein molecules (ii) It helps in the manufacture of enzymes (iii) It helps in the manufacture of hormones (iv) It helps in the manufacture of starch molecules (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) 20 gm (d) (iv) and (i)

WHAT IS UNIT OF LIFE

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Assertion:Sun appears to rise in the east and set in the west Reason:The earth revolves around the sun in uniform circular motion

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What is ER??

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