How can fish, swimming in deep waters, breathe ?
Water contains dissolved air and fish sucks oxygen from water.
Fish is a unique animal in the sense that it does not require oxygen for living. Thus, the fish does not breathe.
Air bubbles are present in deep waters. The fish meets itsrequirement of oxygen from these air bubbles.
Fish drinks water. Water is decomposed, in the belly of the fish, into oxygen and hydrogen. This oxygen is utilized by the fish for the purpose of breathing.
Who invented 'fountain pen' ?
Why do tyres have a rippled surface and not a plane surface ?
Because a rippled surface is beautiful to look at.
Because the force of friction is more between a rippled surface and the ground than between a plane surface and the ground.
Because the force of friction is less between a rippled surface and the ground than between a plane surface and the ground.
It is done to reduce the chances of puncturing of the tyre.
Why a dog runs during summer, with tongue out of his mouth ?
Because dog feels thirsty.
Because he wants to expose his tongue to the rays of'sun. This disinfects the dog's mouth.
Because the dog feels cooi due to evaporation from tongue.
Because during summer", dog begins to breath through his, mouth.
Why do the stars twinkle ?
Because of certain changes taking place in the atmosphere of' the stars.
Because the stars are in continuous motion.
Because the duration of days and nights, on the stars, is or the order of a few seconds only.
Because the light coming from the stars travels through differentlayers of the atmosphere and suffers successive refractions, This gives a twinkling effect.
Who discovered the neutral particles neutron ?
Which of the following statements is true about chlorophyll ?
Chlorophyll helps the plant to absorb sunlight.
Chlorophyll is a green pigment in the leaves of a plant.
Chlorophyll contains. iron.
All of these.
Can you cool a room by keeping the door of the refrigerator open ?
The room can be cooled by keeping the door open.
The room cannot be cooled by keeping the door open.
Instead of cooling, the effect will be reverse. It will make the room slightly warm.
There will be no effect on the temperature of air in the room. . However, humidity will increase.
Why water is used as a cooler in engine radiators ?
Because water is cheap and easily available.
Because water is a bad conductor of electricity.
Because water has high specific heat and absorbs heat quickly.
Because water is a good conductor of heat.
When two bodies are rubbed against each other beat is produced. Where from the heat energy comes ?
The mechanical work done in rubbing the bodies is transformed into the heat energy,
When two bodies are rubbed, their molecules are set in violent motion. Due to this motion, some of the heat energy of the bodies comes to their surface.
When the two bodies are rubbed, some of the adhesive force between the two bodies is transformed into kinetic energy.
None of these.
1. World Geography -Test-01
2. World Geography -Test-02
3. World Geography -Test-03
4. Geography of India -Test-01
5. Geography of India -Test-02
6. Geography of India -Test-03
7. Geography of India -Test-04
8. Geography of India -Test-05
9. History of India - Test - 01
10. History of India - Test - 02
11. History of India - Test - 03
12. History of India - Test - 04
13. History of India - Test - 05
14. History of India - Test - 06
15. History of India - Test - 07
The Red Fort
Highest Paid Female Gamers
How To Do Nail Art At Home
Benefits of Cloves
Think about the morning
Were you a DIY Queen? Do not forget to think about the next day the hired crockery, glassware and cutlery will need to be packed and collected. Do not get caught at 9am the next morning unaware