1 LPG consists of mainly   1 methane, ethane and hexane 2 ethane, hexane and nonane 3 methane, hexane and nonane 4 methane, butane and propane   Answer: Option4

2 The element present in the largest amount in rocks and minerals is —   1 Carbon 2 Silicon 3 Hydrogen 4 Aluminium   Answer: Option2

3 Cell membrane is–   1 permeable 2 selectively permeable 3 semipermeable 4 impermeable   Answer: Option3

4 The hardest substance available on earth is   1 Gold 2 Iron 3 Diamond 4 Platinum   Answer: Option3

5 Which of the following metals remain in liquid for under normal conditions?   1 Radium 2 Zinc 3 Uranium 4 Mercury   Answer: Option4

6 Marsh gas is   1 nitrogen 2 ethane 3 methane 4 hydrogen   Answer: Option3

7 The variety of coal in which the deposit contains recognisable traces of the original plant material is   1 bitumen 2 anthracite 3 lignite 4 peat   Answer: Option4

8 An alloy used in making heating elements for electric heating devices is —   1 Solder 2 Alloysteel 3 Nichrome 4 German Silver   Answer: Option3

9 From which mineral is radium obtained —   1 Limestone 2 Haematitie 3 Pitchblende 4 Rutile   Answer: Option3

10 Gobar gas contains mainly —   1 Methane 2 Carbon dioxide 3 Butane 4 Carbon Monoxide   Answer: Option1