MCQ
Study the given Venn diagram. $X$ is likely to be $.............$
- AA group of people smoking cigarettes.
- BYoungsters dancing in disco.
- CA farmer spraying pesticides near a river.
- ✓Construction work going on at a building site.
✓
Answer
Correct option: D.
Construction work going on at a building site.
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Reason (R): When electric current flows through any conductor, it faces some opposition or resistance to its flow. This resistance converts some electric energy to heat energy.
Read the following statements and select the correct option.
Statement $1:$ Pheromones are used as biological method to control pest.
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→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.
Vocal cords in men are about $............$ long.
→As proved by many studies greenhouse effect is rapidly increasing because of increase in concentration of carbon dioxide. In the given graph the increase in carbon dioxide concentration is shown. What could be $X$ corresponding to it$?$
$i.$ Rate of photosynthesis in plants.
$ii. PH$ of the oceans.
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$ii. PH$ of the oceans.
$iii.$ Water level of ocean.
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All human beings have pairs of chromosomes in the nuclei of their cells.
Which structural feature is absent in bacterial cells?
Which organelle is called the "powerhouse of the cell"?
Match column I with column II and select the correct option from the codes given below.
→|
Column I
|
Column II
|
||
| $P.$ |
Rusting
|
$(i)$ |
Explosion
|
| $Q.$ |
Burning of Paper
|
$(ii)$ |
Spontaneous combustion
|
| $R.$ |
Sodium
|
$(iii)$ |
Rapid combustion
|
| $S.$ |
Fire crackers
|
$(iv)$ |
Slow combustion
|
Which of the following statements is the correct definition of a cell?