A train is moving at 20 m/s passes a platform in 40s while decelerating uniformly to 10 m/s. A man standing at the platform's end observes the train takes 20 s to completely pass him. What is the platform's length
Anonymous Quiz
19%
150m
19%
250m
38%
350m
25%
450m
Michael faraday showed that, if electricity is passed through a solution of an electrolyte, chemical reactions occurred at the electrodes which resulted in
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29%
Liberation of rays at the electrodes
43%
Liberation and deposition of matter at the electrodes
14%
Emission of energy at the electrodes
14%
Release of O2 at electrode
According to thomson , the amount of deviation of the particles from their path in the presence of electrical or magnetic field does not depend upon
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27%
The magnitude of the negative charge on the particle
27%
The mass of the particle
36%
The structure of the electrical or magnetic field
9%
Temprature
Which role did the electric field play in millikan's oil drop experiment?
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17%
To suspend the droplet
25%
To accelerate the droplet
17%
To change the direction of the droplet
42%
To break the droplet into smaller particles
Which of the following statement about thomson model of atom is incorrect
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27%
An atom possesses an spherical shape in which the positive charge is uniformly distributed
33%
The electrons are embedded into it in such a manner as to give the most stable electrostatic arrange
13%
Mass of the atom is assumed to be uniformly distributed over the atom
27%
This model was unable to explain the overall neutrality of the atom
Rutherford model could explain
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20%
Electronic structure of an atom
17%
Stability of an atom
37%
That most of the space in atom is empty
27%
Spectrum of hydrogen atom
❤1
Which of the following is true for "diaphragm, cervical cap and vaults?"
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18%
These are chemical barrier methods
41%
They prevent conception by blocking the entry of sperm through uterus
6%
These contain spermicides like potassium permanganate
35%
These are inserted into the female reproductive tract
Lippes loop prevents contraception
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36%
By increasing phagocytosis of sperms within the uterus
7%
By preventing ovulation
50%
By suppressing sperm motility
7%
By blocking gamete transport using surgical intervention
All of the following are the consequences of over population, except
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20%
It increases the poverty of a country
33%
It leads to the shortage of food supply
0%
It results in unemployment
47%
It contributes to economic growth
Which is the following is true about population explosion
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25%
Increased frequency of diseases in population
44%
Rapid increase in population size
19%
Rapid decrease in population size
13%
Increased number of couples with small families
Among the given problems, which one is not related to reproductively healthy society?
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14%
Over population
18%
Low infant mortality rate
41%
Increased livelihood facilities
27%
High maternal mortality rate