lee floats on water but sinks in alcohol why
Because the force of attraction between the molecules of ice and alcohol is greater than the force of attractioa between
Because the specific gravity of ice is less than that of water but more than that of alcohol.
Because water is more viscDus than alcohol.
Because of all of these reasons.
To assess a nutritional status of a population, which of the following methods will be most appropriate ?
Taking heights and weights and comparing these with normal heights and weights meant for that particular age.
Any clinical symptoms.
All of these.
Why a small space is left between each of the two rails of a railway line ?
Because repairs can be carried out conveniently.
It is done to allow for expansion because a lot of heat is produced on the rails.
It is done to reduce the force of friction between the wheels of the train and the railway line.
Because the small space acts as an outlet for air when the train is passing.
Why a clean and dry needle floats when put gently on the surface of water ?
Because the surface of water behaves like a stretched membrane.
Because the gravitational pull on the needle is balanced by the upward thrust of water.
Because the needle is generally made of a magnetic substance and, therefore, its motion is guided by the earth's magnetic field.
Because the needle is in stable equilibrium.
If a body is thrown, from the surface of earth, with a velocity- the body will leave th,:~ earth and go off into interplanetary space.
greater than 8-2 km/sec.
greater than 9,2 km/sec.
greater than 10-2 km/sec.
greater than 1 P2 km/sec.
Which of the following will happen if the force of earth's, gravitation disappears suddenly ?
The mass of a body will become zero.
The mass of a body will become infinite.
The weight of a body will become zero.
The weight of a body will become infinite.
What can be the secret of good health ?
Eating a variety of foods.
Freedom from infection.
Eating lots of tonics.
None of t hese.
Why does the pressure of air in tyres increase when the vehicle is set in motion 'I
The rotatory motion of the wheels of the vehicle contributes to this increase in pressure.
When the vehicle is in motion, the molecules of the air in the tyres acquire more kinetic energy. This increase in kinetic energy is responsible for the increase in pressure.
Because the tyres suffer a slight contraction when they are in motion.
The temperature increases, air in the tyres expands. . Therefore, there is a slight increase in the pressure of air.
When a bicycle tube is pumped up, the bicycle pump gets heated. Which of the following is the cause of production of this heat energy ?
Transformation of mechanical energy spent in compressing the air particles against the pressure of air inside.
Transformation of mechanical energy spent in overcoming friction.
Both of these.
None of these.
Why human breath is visible in winter but not in summer
Because visibility is better in winter than in'summer.
Because the moisture in the breath condenses, as it comes o of the mouth, during winter.
Because of both of these reasons.
Because of neither of these reasons.
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
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Advanced English Grammar Test
How to Improve English
Observe the mouth movements of those who speak English well and try to imitate them
When you are watching television, observe the mouth movements of the speakers. Repeat what they are saying, while imitating the intonation and rhythm of their speech.