Questions
People who are engaged in separating different types of wool often suffer from sorter's disease. Which bacteria is responsible for it?
- Neisseria bacteria
- Streptococcus bacteria
- Anthrax bacteria
- None of these
What do you understand by virtual image?
- An image which can be obtained on the screen.
- An image which cannot be obtained on the screen.
- An image which is inverted and magnified.
- None of these
Why does one get muscle cramps after excessive running or exercising?
- Because the muscle cells respire aerobically.
- Because of anaerobic respiration which takes place in the muscles.
- Because we breath more hard to fulfill the supply of oxygen.
- None of these
Why do we use tungsten to make the filament of a bulb?
- It has the lowest thermal expasion coefficient.
- It has high meting point.
- Both 1 and 2 are correct.
- None of these
In yeast, the anaerobic respiration also called as alcoholic fermentation, is the basis of two major processes, ________ and _________.
- brewing and baking
- brewing and bio-diesel production
- baking and bio-diesel production.
- none of these
When blue vitriol solution reacts with a piece of iron, a new substance gets deposited on the piece of iron. What is the colour of the deposited substance?
- Green
- Blue
- Brown
- None of these
We all know about acid rain. Which acid makes the rain acidic and is very harmful?
- Carbonic acid
- Nitric acid
- Suphuric acid
- All of these
Where does the exchange of gases during respiration in a cockroach takes place (taking in of oxygen and giving out carbon dioxide)?
- Lungs
- Trachea
- Spiracles
- None of these
Why is horse dung mixed in black soil and heated to make items like surahi, mataka etc.?
- Burnt horse dung helps open pores in the soil.
- To give the item strength.
- It helps in retaining the shape easily.
- None of these
Clocks used for scientific research can measure the smallest time interval as small as
- one micro second
- one nano second
- one hundredth
- None of these