Question
A train approaches a stationary observer with a speed of
36 km/h. It emits a sound of frequency 500 Hz. If the speed of sound is 340 m/s, what is the apparent frequency heard by the observer?Solution
The apparent frequency (f′) heard by a stationary observer when a source is moving towards them is given by the Doppler effect formula: 
- Statements:
Some second is minute
Mostly minute is hour
All hour is time
Conclusions:
I. Some time is second Statements:
All Platters are Roasters.
All Roasters are Sticks.
No Stick is a Pan.
Conclusions:
I. All roasters can be Pan.
II. No Pan is a Platter.
Statement:
Only tiger are lion.
No lion is elephant.
Only zebras are elephant.
Conclusion:
1. No elephant is tige...
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at varianc...
X lives to the north east of ___.Â
Statements:
All Star are Meteor.
Some Meteor are Comet.
Only a few Constellation are Comet.
Conclusions:
I. All Comet...
Statements:
No poem is a story.
All stories are novels.
All novels are articles.
Conclusions:
I. All articles are...
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance...
Statements:a.Some dogs are not rats
b. Some rats are lions
Conclusions:I. Some dogs are not lions
II. Some lions are not dogs
Statements:
No Laptop is Computer.
Few Computer is Tablet.
No Tablet is Notebook.
Conclusions:
I. All Tablet being Co...
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