GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 025
241).
The filament of an electric lamp becomes white hot but the lead-in
wires holding the filament are only slightly heated because they
A). have smaller current passing through them
B). have very low resistance
C). have higher melting point
D). are made of black iron
Answer: have very low resistance
242). Air is completely removed from an electric bulb to prevent
A). oxidation of tungsten filament
B). bursting of the bulb
C). loss of light due to absorption
D). none of these
Answer: oxidation of tungsten filament
243). Assertion: When an electric bulb is switched on, the resistance of its tungsten filament increases.
Reason: The resistance of pure metals increases on heating
A). A and R are correct, and R explains A
B). A and R are correct, but R does not explain A
C). A is right, R is wrong
D). Both A and R are wrong
Answer: A and R are correct, and R explains A
244). When an electric bulb breaks, there is a mild bang due to
A). the chemical reaction between the enclosed gases
B). the compressed gases rushing out suddenly
C). the air rushing in to fill the evacuated space
D). some other reason
Answer: the air rushing in to fill the evacuated space
245). A common fluorescent tube contains
A). sodium vapour
B). argon at low pressure
C). mercury vapour at low pressure
D). mercuric oxide and neon
Answer: mercury vapour at low pressure
246). In which of the following industries is mica used as a raw material?
A). electrical
B). iron and steel
C). toys
D). glass and pottery
Answer: electrical
247). The effective radius of atom is
A). 10^−6 m
B). 10^−10 m
C). 10^−14 m
D). 10^−15 m
Answer: 10^−10 m
248). Which of the following rays are produced when very high energy, electrons are stopped suddenly at a metal target?
A). alpha rays
B). βrays
C). y - rays
D). X - rays
Answer: X - rays
249). The nucleus of an atom contains
A). protons and neutrons
B). protons and electrons
C). neutrons and electrons
D). only neutrons
Answer: protons and neutrons
250). The force between two protons (positively charged particles) is
A). always repulsive
B). always attractive
C). attractive or repulsive depending on the distance between them
D). always zero
Answer: attractive or repulsive depending on the distance between them
A). have smaller current passing through them
B). have very low resistance
C). have higher melting point
D). are made of black iron
Answer: have very low resistance
242). Air is completely removed from an electric bulb to prevent
A). oxidation of tungsten filament
B). bursting of the bulb
C). loss of light due to absorption
D). none of these
Answer: oxidation of tungsten filament
243). Assertion: When an electric bulb is switched on, the resistance of its tungsten filament increases.
Reason: The resistance of pure metals increases on heating
A). A and R are correct, and R explains A
B). A and R are correct, but R does not explain A
C). A is right, R is wrong
D). Both A and R are wrong
Answer: A and R are correct, and R explains A
244). When an electric bulb breaks, there is a mild bang due to
A). the chemical reaction between the enclosed gases
B). the compressed gases rushing out suddenly
C). the air rushing in to fill the evacuated space
D). some other reason
Answer: the air rushing in to fill the evacuated space
245). A common fluorescent tube contains
A). sodium vapour
B). argon at low pressure
C). mercury vapour at low pressure
D). mercuric oxide and neon
Answer: mercury vapour at low pressure
246). In which of the following industries is mica used as a raw material?
A). electrical
B). iron and steel
C). toys
D). glass and pottery
Answer: electrical
247). The effective radius of atom is
A). 10^−6 m
B). 10^−10 m
C). 10^−14 m
D). 10^−15 m
Answer: 10^−10 m
248). Which of the following rays are produced when very high energy, electrons are stopped suddenly at a metal target?
A). alpha rays
B). βrays
C). y - rays
D). X - rays
Answer: X - rays
249). The nucleus of an atom contains
A). protons and neutrons
B). protons and electrons
C). neutrons and electrons
D). only neutrons
Answer: protons and neutrons
250). The force between two protons (positively charged particles) is
A). always repulsive
B). always attractive
C). attractive or repulsive depending on the distance between them
D). always zero
Answer: attractive or repulsive depending on the distance between them
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