# General Science MCQs with Answers For UPSC, SSC, WBPSC Exams P11

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1481101. The hydraulic breaks used in automobiles is a direct application of -
A
Pascal's law
B
Archimedes
C
Bernoulli's theorem
D
Torricelli law.
A
Explanation: Pascal's principle, also called Pascal's law, in fluid (gas or liquid) mechanics, statement that in a fluid at rest in a closed container, a pressure change in one part is transmitted without loss to every portion of the fluid and to the walls of the container.
1490102. In case of an ideal gas, Joule-Thomson effect is
A
negative
B
infinite
C
zero
D
positive.
C
1484103. The same force is applied to two bodies A and B of masses m and 5m respectively for the same time. Then
A
The momentum of A will be greater.
B
The momentum of B will be greater.
C
The velocity of A and B will be the same.
D
The momentum of A and B will be the same.
D
Correct Answer: D. The momentum of A and B will be the same.
1489104. A glass bulb is balanced by a brass weight on a sensitive beam balance. Now the balance is covered by a bell-jar which is then evacuated
A
The pan containing the bulb will go up or down depending on the degree of vacuum produced
B
The pan containing the bulb will go down
C
The beam will continue to remain horizontal
D
The pan containing the bulb will go up.
B
Correct Answer: B. The pan containing the bulb will go down
1526105. Which of the following metals is the best conductor of heat and electricity
A
Silver
B
Potassium
C
Sodium
D
Copper
A
1534106. If the temperature is kept constant during a reaction, the process is called
A
Isochoric
B
Isothermal
C
D
Isobaric
B
1516107. When the angle of incidence is equal to the critical angle for the media, the angle of refraction is
A
45°
B
90°
C
D
Angle of incidence
B
1460108. A piece of cotton cloth gets wet if one end of it is dipped in water in a glass. This is due to
A
Elasticity
B
Capillarity
C
Gravitation
D
Viscosity.
B
1609109. Which of the following waves is used for telecommunication?
A
Microwaves
B
X-rays
C
Infrared rays
D
Ultraviolet rays
A
1582110. RADAR is based on the principle that
A
Sound waves are reflected by an object
B
Sound waves are a transverse wave
C
Radio waves are reflected by objects
D
Sound waves can travel in the air
C