Which of the following applications of plastics show(s) that plastics are bad conductors of electricity?
I. Refrigerators have an insulating wool of plastics.
II. Electric wires have a plastic coating.
III. Chemicals are stored in plastic containers.
IV. Parachutes are made from plastics.
A II, III and IV only
B III and IV only
C I only
D II only
One word answers are given for a few statements. Mark the answer which is not correct.
A Resources which will either never run out or are replaced within a reasonable period of time - Renewable resources.
B Wise and careful use of resources by not wasting them - Conservation.
C Conversion of wood into coal over million of years due to high temperature and pressure under the earth - Carbonisation.
D A black, viscous liquid extracted from the rocks which is a source of hydrocarbons - Coal tar.
Match column I with column II and choose the correct option from the codes given below.
|Column I (Amorphous forms of carbon)||Column II (Uses)|
|(P) Lamp black||(i) For making electrodes for dry cell|
|(Q) Bone charcoal||(ii) In gas masks|
|(R) Wood charcoal||(iii) In extraction of metals|
|(S) Gas carbon||(iv) To remove colour from sugarcane juice|
|(T) Coke||(v) For making black shoe polish|
Fill in the blanks left in the classification of the fossil fuels.
|A||Petroleum||Coal||Petroleum gas||Bitumen||Coal gas||Coke|
|B||Coal||Petroleum||Coal gas||Coke||Petroleum gas||Bitumen|
|C||Coal||Petroleum gas||Coal||Charcoal||Gasoline||Coal tar|
Harsh, Niketan and Shubh were making a craft project together. For the project, Harsh bought one kilogram of marbles, Niketan bought one kilogram of glitter particles and Shubh bought one kilogram of feathers. Select the correct option based on this data.
AHarsh's bag will be the heaviest among them.
BShubh's bag will be the lightest among them.
CAll of them will have the equally heavy bags.
DBoth A and B
it should be A because marbles are the heaviest
Read the following statements and select the correct option.
Statement 1: Pheromones are used as biological method to control pest.
Statement 2: Pheromones lure adult male insects into special traps and prevent them from breeding.
A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Both statements 1 and 2 are false.