GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 022
211).
A clearly separate echo of a sound is heard when the minimum distance
of the4 reflecting surface from the source of sound is
A). 20m
B). 17m
C). 34m
D). 100m
Answer: 17m
212). The walls and ceiling of an auditorium are covered with fibrous material, such as glass fibre, to
A). beautify the auditorium
B). reduce the cost of construction
C). make the auditorium fire-proof
D). absorb sound and prevent echoes
Answer: absorb sound and prevent echoes
213). Bats can fly in the dark because
A). they have a better vision in the dark
B). the pupils of their eyes are very big
C). they are guided by ultrasonic waves produced by them
D). any bird can do so
Answer: they are guided by ultrasonic waves produced by them
214). A police van sounding its siren is moving away from an observer. The pith (shrillness) of the sound from the siren relative to its normal pitch is
A). lower
B). same
C). higher
D). lower or higher depending on the speed of the van
Answer: lower
215). A device used for measuring the depth of the sea is called
A). altimeter
B). fathometer
C). hydrometer
D). manometer
Answer: fathometer
216). If a bar magnet, tied in the middle with a thread, were suspended at the north pole of the earth, would take
A). a horizontal position
B). a nearly vertical position with its north pole pointing downward
C). a vertical position with its south pole pointing downward
D). a slanting position
Answer: a nearly vertical position with its north pole pointing downward
217). Two steel pins, sticking to the end of a bar magnet do not hang vertically because
A). their heads are not properly rounded
B). of the spherical shape of their heads
C). similar poles repel
D). they are made of a magnetic substance
Answer: similar poles repel
218). The crackling sound, heard when dry hair is combed with a hard rubber comb, is due to
A). the hair banging against the charged comb
B). small electric sparks
C). the rubbing of the comb with the hair
D). none of these
Answer: small electric sparks
219). A capacitor (condenser) is used in an electric circuit to
A). step down voltage
B). step up Voltage
C). store electric charge
D). produce electric charge
Answer: store electric charge
220). Which of the following is a semiconductor?
A). phosphorus
B). wood
C). silicon
D). glass
Answer: silicon
A). 20m
B). 17m
C). 34m
D). 100m
Answer: 17m
212). The walls and ceiling of an auditorium are covered with fibrous material, such as glass fibre, to
A). beautify the auditorium
B). reduce the cost of construction
C). make the auditorium fire-proof
D). absorb sound and prevent echoes
Answer: absorb sound and prevent echoes
213). Bats can fly in the dark because
A). they have a better vision in the dark
B). the pupils of their eyes are very big
C). they are guided by ultrasonic waves produced by them
D). any bird can do so
Answer: they are guided by ultrasonic waves produced by them
214). A police van sounding its siren is moving away from an observer. The pith (shrillness) of the sound from the siren relative to its normal pitch is
A). lower
B). same
C). higher
D). lower or higher depending on the speed of the van
Answer: lower
215). A device used for measuring the depth of the sea is called
A). altimeter
B). fathometer
C). hydrometer
D). manometer
Answer: fathometer
216). If a bar magnet, tied in the middle with a thread, were suspended at the north pole of the earth, would take
A). a horizontal position
B). a nearly vertical position with its north pole pointing downward
C). a vertical position with its south pole pointing downward
D). a slanting position
Answer: a nearly vertical position with its north pole pointing downward
217). Two steel pins, sticking to the end of a bar magnet do not hang vertically because
A). their heads are not properly rounded
B). of the spherical shape of their heads
C). similar poles repel
D). they are made of a magnetic substance
Answer: similar poles repel
218). The crackling sound, heard when dry hair is combed with a hard rubber comb, is due to
A). the hair banging against the charged comb
B). small electric sparks
C). the rubbing of the comb with the hair
D). none of these
Answer: small electric sparks
219). A capacitor (condenser) is used in an electric circuit to
A). step down voltage
B). step up Voltage
C). store electric charge
D). produce electric charge
Answer: store electric charge
220). Which of the following is a semiconductor?
A). phosphorus
B). wood
C). silicon
D). glass
Answer: silicon
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